xref: /frameworks/base/core/java/android/widget/Editor.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.widget;

import android.R;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.ClipData;
import android.content.ClipData.Item;
import android.content.Context;
import android.content.Intent;
import android.content.UndoManager;
import android.content.UndoOperation;
import android.content.UndoOwner;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.LocaleList;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.ParcelableParcel;
import android.os.SystemClock;
import android.provider.Settings;
import android.text.DynamicLayout;
import android.text.Editable;
import android.text.InputFilter;
import android.text.InputType;
import android.text.Layout;
import android.text.ParcelableSpan;
import android.text.Selection;
import android.text.SpanWatcher;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.StaticLayout;
import android.text.TextUtils;
import android.text.method.KeyListener;
import android.text.method.MetaKeyKeyListener;
import android.text.method.MovementMethod;
import android.text.method.WordIterator;
import android.text.style.EasyEditSpan;
import android.text.style.SuggestionRangeSpan;
import android.text.style.SuggestionSpan;
import android.text.style.TextAppearanceSpan;
import android.text.style.URLSpan;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.SparseArray;
import android.view.ActionMode;
import android.view.ActionMode.Callback;
import android.view.ContextMenu;
import android.view.ContextThemeWrapper;
import android.view.DisplayListCanvas;
import android.view.DragAndDropPermissions;
import android.view.DragEvent;
import android.view.Gravity;
import android.view.InputDevice;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.RenderNode;
import android.view.SubMenu;
import android.view.View;
import android.view.View.DragShadowBuilder;
import android.view.View.OnClickListener;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewParent;
import android.view.ViewTreeObserver;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.inputmethod.CorrectionInfo;
import android.view.inputmethod.CursorAnchorInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.ExtractedText;
import android.view.inputmethod.ExtractedTextRequest;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TextView.Drawables;
import android.widget.TextView.OnEditorActionListener;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.util.ArrayUtils;
import com.android.internal.util.GrowingArrayUtils;
import com.android.internal.util.Preconditions;
import com.android.internal.widget.EditableInputConnection;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.text.BreakIterator;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;


/**
 * Helper class used by TextView to handle editable text views.
 *
 * @hide
 */
public class Editor {
    private static final String TAG = "Editor";
    private static final boolean DEBUG_UNDO = false;

    static final int BLINK = 500;
    private static final float[] TEMP_POSITION = new float[2];
    private static int DRAG_SHADOW_MAX_TEXT_LENGTH = 20;
    private static final float LINE_SLOP_MULTIPLIER_FOR_HANDLEVIEWS = 0.5f;
    private static final int UNSET_X_VALUE = -1;
    private static final int UNSET_LINE = -1;
    // Tag used when the Editor maintains its own separate UndoManager.
    private static final String UNDO_OWNER_TAG = "Editor";

    // Ordering constants used to place the Action Mode or context menu items in their menu.
    private static final int MENU_ITEM_ORDER_UNDO = 1;
    private static final int MENU_ITEM_ORDER_REDO = 2;
    private static final int MENU_ITEM_ORDER_CUT = 3;
    private static final int MENU_ITEM_ORDER_COPY = 4;
    private static final int MENU_ITEM_ORDER_PASTE = 5;
    private static final int MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT = 6;
    private static final int MENU_ITEM_ORDER_SHARE = 7;
    private static final int MENU_ITEM_ORDER_SELECT_ALL = 8;
    private static final int MENU_ITEM_ORDER_REPLACE = 9;
    private static final int MENU_ITEM_ORDER_PROCESS_TEXT_INTENT_ACTIONS_START = 10;

    // Each Editor manages its own undo stack.
    private final UndoManager mUndoManager = new UndoManager();
    private UndoOwner mUndoOwner = mUndoManager.getOwner(UNDO_OWNER_TAG, this);
    final UndoInputFilter mUndoInputFilter = new UndoInputFilter(this);
    boolean mAllowUndo = true;

    // Cursor Controllers.
    InsertionPointCursorController mInsertionPointCursorController;
    SelectionModifierCursorController mSelectionModifierCursorController;
    // Action mode used when text is selected or when actions on an insertion cursor are triggered.
    ActionMode mTextActionMode;
    boolean mInsertionControllerEnabled;
    boolean mSelectionControllerEnabled;

    // Used to highlight a word when it is corrected by the IME
    CorrectionHighlighter mCorrectionHighlighter;

    InputContentType mInputContentType;
    InputMethodState mInputMethodState;

    private static class TextRenderNode {
        RenderNode renderNode;
        boolean isDirty;
        public TextRenderNode(String name) {
            isDirty = true;
            renderNode = RenderNode.create(name, null);
        }
        boolean needsRecord() { return isDirty || !renderNode.isValid(); }
    }
    TextRenderNode[] mTextRenderNodes;

    boolean mFrozenWithFocus;
    boolean mSelectionMoved;
    boolean mTouchFocusSelected;

    KeyListener mKeyListener;
    int mInputType = EditorInfo.TYPE_NULL;

    boolean mDiscardNextActionUp;
    boolean mIgnoreActionUpEvent;
    private boolean mIgnoreNextMouseActionUpOrDown;

    long mShowCursor;
    Blink mBlink;

    boolean mCursorVisible = true;
    boolean mSelectAllOnFocus;
    boolean mTextIsSelectable;

    CharSequence mError;
    boolean mErrorWasChanged;
    ErrorPopup mErrorPopup;

    /**
     * This flag is set if the TextView tries to display an error before it
     * is attached to the window (so its position is still unknown).
     * It causes the error to be shown later, when onAttachedToWindow()
     * is called.
     */
    boolean mShowErrorAfterAttach;

    boolean mInBatchEditControllers;
    boolean mShowSoftInputOnFocus = true;
    private boolean mPreserveSelection;
    private boolean mRestartActionModeOnNextRefresh;

    boolean mIsBeingLongClicked;

    SuggestionsPopupWindow mSuggestionsPopupWindow;
    SuggestionRangeSpan mSuggestionRangeSpan;
    Runnable mShowSuggestionRunnable;

    final Drawable[] mCursorDrawable = new Drawable[2];
    int mCursorCount; // Current number of used mCursorDrawable: 0 (resource=0), 1 or 2 (split)

    private Drawable mSelectHandleLeft;
    private Drawable mSelectHandleRight;
    private Drawable mSelectHandleCenter;

    // Global listener that detects changes in the global position of the TextView
    private PositionListener mPositionListener;

    float mLastDownPositionX, mLastDownPositionY;
    private float mContextMenuAnchorX, mContextMenuAnchorY;
    Callback mCustomSelectionActionModeCallback;
    Callback mCustomInsertionActionModeCallback;

    // Set when this TextView gained focus with some text selected. Will start selection mode.
    boolean mCreatedWithASelection;

    // Indicates the current tap state (first tap, double tap, or triple click).
    private int mTapState = TAP_STATE_INITIAL;
    private long mLastTouchUpTime = 0;
    private static final int TAP_STATE_INITIAL = 0;
    private static final int TAP_STATE_FIRST_TAP = 1;
    private static final int TAP_STATE_DOUBLE_TAP = 2;
    // Only for mouse input.
    private static final int TAP_STATE_TRIPLE_CLICK = 3;

    // The button state as of the last time #onTouchEvent is called.
    private int mLastButtonState;

    private Runnable mInsertionActionModeRunnable;

    // The span controller helps monitoring the changes to which the Editor needs to react:
    // - EasyEditSpans, for which we have some UI to display on attach and on hide
    // - SelectionSpans, for which we need to call updateSelection if an IME is attached
    private SpanController mSpanController;

    WordIterator mWordIterator;
    SpellChecker mSpellChecker;

    // This word iterator is set with text and used to determine word boundaries
    // when a user is selecting text.
    private WordIterator mWordIteratorWithText;
    // Indicate that the text in the word iterator needs to be updated.
    private boolean mUpdateWordIteratorText;

    private Rect mTempRect;

    private TextView mTextView;

    final ProcessTextIntentActionsHandler mProcessTextIntentActionsHandler;

    final CursorAnchorInfoNotifier mCursorAnchorInfoNotifier = new CursorAnchorInfoNotifier();

    private final Runnable mShowFloatingToolbar = new Runnable() {
        @Override
        public void run() {
            if (mTextActionMode != null) {
                mTextActionMode.hide(0);  // hide off.
            }
        }
    };

    boolean mIsInsertionActionModeStartPending = false;

    private final SuggestionHelper mSuggestionHelper = new SuggestionHelper();

    Editor(TextView textView) {
        mTextView = textView;
        // Synchronize the filter list, which places the undo input filter at the end.
        mTextView.setFilters(mTextView.getFilters());
        mProcessTextIntentActionsHandler = new ProcessTextIntentActionsHandler(this);
    }

    ParcelableParcel saveInstanceState() {
        ParcelableParcel state = new ParcelableParcel(getClass().getClassLoader());
        Parcel parcel = state.getParcel();
        mUndoManager.saveInstanceState(parcel);
        mUndoInputFilter.saveInstanceState(parcel);
        return state;
    }

    void restoreInstanceState(ParcelableParcel state) {
        Parcel parcel = state.getParcel();
        mUndoManager.restoreInstanceState(parcel, state.getClassLoader());
        mUndoInputFilter.restoreInstanceState(parcel);
        // Re-associate this object as the owner of undo state.
        mUndoOwner = mUndoManager.getOwner(UNDO_OWNER_TAG, this);
    }

    /**
     * Forgets all undo and redo operations for this Editor.
     */
    void forgetUndoRedo() {
        UndoOwner[] owners = { mUndoOwner };
        mUndoManager.forgetUndos(owners, -1 /* all */);
        mUndoManager.forgetRedos(owners, -1 /* all */);
    }

    boolean canUndo() {
        UndoOwner[] owners = { mUndoOwner };
        return mAllowUndo && mUndoManager.countUndos(owners) > 0;
    }

    boolean canRedo() {
        UndoOwner[] owners = { mUndoOwner };
        return mAllowUndo && mUndoManager.countRedos(owners) > 0;
    }

    void undo() {
        if (!mAllowUndo) {
            return;
        }
        UndoOwner[] owners = { mUndoOwner };
        mUndoManager.undo(owners, 1);  // Undo 1 action.
    }

    void redo() {
        if (!mAllowUndo) {
            return;
        }
        UndoOwner[] owners = { mUndoOwner };
        mUndoManager.redo(owners, 1);  // Redo 1 action.
    }

    void replace() {
        if (mSuggestionsPopupWindow == null) {
            mSuggestionsPopupWindow = new SuggestionsPopupWindow();
        }
        hideCursorAndSpanControllers();
        mSuggestionsPopupWindow.show();

        int middle = (mTextView.getSelectionStart() + mTextView.getSelectionEnd()) / 2;
        Selection.setSelection((Spannable) mTextView.getText(), middle);
    }

    void onAttachedToWindow() {
        if (mShowErrorAfterAttach) {
            showError();
            mShowErrorAfterAttach = false;
        }

        final ViewTreeObserver observer = mTextView.getViewTreeObserver();
        // No need to create the controller.
        // The get method will add the listener on controller creation.
        if (mInsertionPointCursorController != null) {
            observer.addOnTouchModeChangeListener(mInsertionPointCursorController);
        }
        if (mSelectionModifierCursorController != null) {
            mSelectionModifierCursorController.resetTouchOffsets();
            observer.addOnTouchModeChangeListener(mSelectionModifierCursorController);
        }
        updateSpellCheckSpans(0, mTextView.getText().length(),
                true /* create the spell checker if needed */);

        if (mTextView.hasSelection()) {
            refreshTextActionMode();
        }

        getPositionListener().addSubscriber(mCursorAnchorInfoNotifier, true);
        resumeBlink();
    }

    void onDetachedFromWindow() {
        getPositionListener().removeSubscriber(mCursorAnchorInfoNotifier);

        if (mError != null) {
            hideError();
        }

        suspendBlink();

        if (mInsertionPointCursorController != null) {
            mInsertionPointCursorController.onDetached();
        }

        if (mSelectionModifierCursorController != null) {
            mSelectionModifierCursorController.onDetached();
        }

        if (mShowSuggestionRunnable != null) {
            mTextView.removeCallbacks(mShowSuggestionRunnable);
        }

        // Cancel the single tap delayed runnable.
        if (mInsertionActionModeRunnable != null) {
            mTextView.removeCallbacks(mInsertionActionModeRunnable);
        }

        mTextView.removeCallbacks(mShowFloatingToolbar);

        discardTextDisplayLists();

        if (mSpellChecker != null) {
            mSpellChecker.closeSession();
            // Forces the creation of a new SpellChecker next time this window is created.
            // Will handle the cases where the settings has been changed in the meantime.
            mSpellChecker = null;
        }

        hideCursorAndSpanControllers();
        stopTextActionModeWithPreservingSelection();
    }

    private void discardTextDisplayLists() {
        if (mTextRenderNodes != null) {
            for (int i = 0; i < mTextRenderNodes.length; i++) {
                RenderNode displayList = mTextRenderNodes[i] != null
                        ? mTextRenderNodes[i].renderNode : null;
                if (displayList != null && displayList.isValid()) {
                    displayList.discardDisplayList();
                }
            }
        }
    }

    private void showError() {
        if (mTextView.getWindowToken() == null) {
            mShowErrorAfterAttach = true;
            return;
        }

        if (mErrorPopup == null) {
            LayoutInflater inflater = LayoutInflater.from(mTextView.getContext());
            final TextView err = (TextView) inflater.inflate(
                    com.android.internal.R.layout.textview_hint, null);

            final float scale = mTextView.getResources().getDisplayMetrics().density;
            mErrorPopup = new ErrorPopup(err, (int)(200 * scale + 0.5f), (int)(50 * scale + 0.5f));
            mErrorPopup.setFocusable(false);
            // The user is entering text, so the input method is needed.  We
            // don't want the popup to be displayed on top of it.
            mErrorPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
        }

        TextView tv = (TextView) mErrorPopup.getContentView();
        chooseSize(mErrorPopup, mError, tv);
        tv.setText(mError);

        mErrorPopup.showAsDropDown(mTextView, getErrorX(), getErrorY());
        mErrorPopup.fixDirection(mErrorPopup.isAboveAnchor());
    }

    public void setError(CharSequence error, Drawable icon) {
        mError = TextUtils.stringOrSpannedString(error);
        mErrorWasChanged = true;

        if (mError == null) {
            setErrorIcon(null);
            if (mErrorPopup != null) {
                if (mErrorPopup.isShowing()) {
                    mErrorPopup.dismiss();
                }

                mErrorPopup = null;
            }
            mShowErrorAfterAttach = false;
        } else {
            setErrorIcon(icon);
            if (mTextView.isFocused()) {
                showError();
            }
        }
    }

    private void setErrorIcon(Drawable icon) {
        Drawables dr = mTextView.mDrawables;
        if (dr == null) {
            mTextView.mDrawables = dr = new Drawables(mTextView.getContext());
        }
        dr.setErrorDrawable(icon, mTextView);

        mTextView.resetResolvedDrawables();
        mTextView.invalidate();
        mTextView.requestLayout();
    }

    private void hideError() {
        if (mErrorPopup != null) {
            if (mErrorPopup.isShowing()) {
                mErrorPopup.dismiss();
            }
        }

        mShowErrorAfterAttach = false;
    }

    /**
     * Returns the X offset to make the pointy top of the error point
     * at the middle of the error icon.
     */
    private int getErrorX() {
        /*
         * The "25" is the distance between the point and the right edge
         * of the background
         */
        final float scale = mTextView.getResources().getDisplayMetrics().density;

        final Drawables dr = mTextView.mDrawables;

        final int layoutDirection = mTextView.getLayoutDirection();
        int errorX;
        int offset;
        switch (layoutDirection) {
            default:
            case View.LAYOUT_DIRECTION_LTR:
                offset = - (dr != null ? dr.mDrawableSizeRight : 0) / 2 + (int) (25 * scale + 0.5f);
                errorX = mTextView.getWidth() - mErrorPopup.getWidth() -
                        mTextView.getPaddingRight() + offset;
                break;
            case View.LAYOUT_DIRECTION_RTL:
                offset = (dr != null ? dr.mDrawableSizeLeft : 0) / 2 - (int) (25 * scale + 0.5f);
                errorX = mTextView.getPaddingLeft() + offset;
                break;
        }
        return errorX;
    }

    /**
     * Returns the Y offset to make the pointy top of the error point
     * at the bottom of the error icon.
     */
    private int getErrorY() {
        /*
         * Compound, not extended, because the icon is not clipped
         * if the text height is smaller.
         */
        final int compoundPaddingTop = mTextView.getCompoundPaddingTop();
        int vspace = mTextView.getBottom() - mTextView.getTop() -
                mTextView.getCompoundPaddingBottom() - compoundPaddingTop;

        final Drawables dr = mTextView.mDrawables;

        final int layoutDirection = mTextView.getLayoutDirection();
        int height;
        switch (layoutDirection) {
            default:
            case View.LAYOUT_DIRECTION_LTR:
                height = (dr != null ? dr.mDrawableHeightRight : 0);
                break;
            case View.LAYOUT_DIRECTION_RTL:
                height = (dr != null ? dr.mDrawableHeightLeft : 0);
                break;
        }

        int icontop = compoundPaddingTop + (vspace - height) / 2;

        /*
         * The "2" is the distance between the point and the top edge
         * of the background.
         */
        final float scale = mTextView.getResources().getDisplayMetrics().density;
        return icontop + height - mTextView.getHeight() - (int) (2 * scale + 0.5f);
    }

    void createInputContentTypeIfNeeded() {
        if (mInputContentType == null) {
            mInputContentType = new InputContentType();
        }
    }

    void createInputMethodStateIfNeeded() {
        if (mInputMethodState == null) {
            mInputMethodState = new InputMethodState();
        }
    }

    boolean isCursorVisible() {
        // The default value is true, even when there is no associated Editor
        return mCursorVisible && mTextView.isTextEditable();
    }

    void prepareCursorControllers() {
        boolean windowSupportsHandles = false;

        ViewGroup.LayoutParams params = mTextView.getRootView().getLayoutParams();
        if (params instanceof WindowManager.LayoutParams) {
            WindowManager.LayoutParams windowParams = (WindowManager.LayoutParams) params;
            windowSupportsHandles = windowParams.type < WindowManager.LayoutParams.FIRST_SUB_WINDOW
                    || windowParams.type > WindowManager.LayoutParams.LAST_SUB_WINDOW;
        }

        boolean enabled = windowSupportsHandles && mTextView.getLayout() != null;
        mInsertionControllerEnabled = enabled && isCursorVisible();
        mSelectionControllerEnabled = enabled && mTextView.textCanBeSelected();

        if (!mInsertionControllerEnabled) {
            hideInsertionPointCursorController();
            if (mInsertionPointCursorController != null) {
                mInsertionPointCursorController.onDetached();
                mInsertionPointCursorController = null;
            }
        }

        if (!mSelectionControllerEnabled) {
            stopTextActionMode();
            if (mSelectionModifierCursorController != null) {
                mSelectionModifierCursorController.onDetached();
                mSelectionModifierCursorController = null;
            }
        }
    }

    void hideInsertionPointCursorController() {
        if (mInsertionPointCursorController != null) {
            mInsertionPointCursorController.hide();
        }
    }

    /**
     * Hides the insertion and span controllers.
     */
    void hideCursorAndSpanControllers() {
        hideCursorControllers();
        hideSpanControllers();
    }

    private void hideSpanControllers() {
        if (mSpanController != null) {
            mSpanController.hide();
        }
    }

    private void hideCursorControllers() {
        // When mTextView is not ExtractEditText, we need to distinguish two kinds of focus-lost.
        // One is the true focus lost where suggestions pop-up (if any) should be dismissed, and the
        // other is an side effect of showing the suggestions pop-up itself. We use isShowingUp()
        // to distinguish one from the other.
        if (mSuggestionsPopupWindow != null && ((mTextView.isInExtractedMode()) ||
                !mSuggestionsPopupWindow.isShowingUp())) {
            // Should be done before hide insertion point controller since it triggers a show of it
            mSuggestionsPopupWindow.hide();
        }
        hideInsertionPointCursorController();
    }

    /**
     * Create new SpellCheckSpans on the modified region.
     */
    private void updateSpellCheckSpans(int start, int end, boolean createSpellChecker) {
        // Remove spans whose adjacent characters are text not punctuation
        mTextView.removeAdjacentSuggestionSpans(start);
        mTextView.removeAdjacentSuggestionSpans(end);

        if (mTextView.isTextEditable() && mTextView.isSuggestionsEnabled() &&
                !(mTextView.isInExtractedMode())) {
            if (mSpellChecker == null && createSpellChecker) {
                mSpellChecker = new SpellChecker(mTextView);
            }
            if (mSpellChecker != null) {
                mSpellChecker.spellCheck(start, end);
            }
        }
    }

    void onScreenStateChanged(int screenState) {
        switch (screenState) {
            case View.SCREEN_STATE_ON:
                resumeBlink();
                break;
            case View.SCREEN_STATE_OFF:
                suspendBlink();
                break;
        }
    }

    private void suspendBlink() {
        if (mBlink != null) {
            mBlink.cancel();
        }
    }

    private void resumeBlink() {
        if (mBlink != null) {
            mBlink.uncancel();
            makeBlink();
        }
    }

    void adjustInputType(boolean password, boolean passwordInputType,
            boolean webPasswordInputType, boolean numberPasswordInputType) {
        // mInputType has been set from inputType, possibly modified by mInputMethod.
        // Specialize mInputType to [web]password if we have a text class and the original input
        // type was a password.
        if ((mInputType & EditorInfo.TYPE_MASK_CLASS) == EditorInfo.TYPE_CLASS_TEXT) {
            if (password || passwordInputType) {
                mInputType = (mInputType & ~(EditorInfo.TYPE_MASK_VARIATION))
                        | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD;
            }
            if (webPasswordInputType) {
                mInputType = (mInputType & ~(EditorInfo.TYPE_MASK_VARIATION))
                        | EditorInfo.TYPE_TEXT_VARIATION_WEB_PASSWORD;
            }
        } else if ((mInputType & EditorInfo.TYPE_MASK_CLASS) == EditorInfo.TYPE_CLASS_NUMBER) {
            if (numberPasswordInputType) {
                mInputType = (mInputType & ~(EditorInfo.TYPE_MASK_VARIATION))
                        | EditorInfo.TYPE_NUMBER_VARIATION_PASSWORD;
            }
        }
    }

    private void chooseSize(PopupWindow pop, CharSequence text, TextView tv) {
        int wid = tv.getPaddingLeft() + tv.getPaddingRight();
        int ht = tv.getPaddingTop() + tv.getPaddingBottom();

        int defaultWidthInPixels = mTextView.getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.textview_error_popup_default_width);
        Layout l = new StaticLayout(text, tv.getPaint(), defaultWidthInPixels,
                                    Layout.Alignment.ALIGN_NORMAL, 1, 0, true);
        float max = 0;
        for (int i = 0; i < l.getLineCount(); i++) {
            max = Math.max(max, l.getLineWidth(i));
        }

        /*
         * Now set the popup size to be big enough for the text plus the border capped
         * to DEFAULT_MAX_POPUP_WIDTH
         */
        pop.setWidth(wid + (int) Math.ceil(max));
        pop.setHeight(ht + l.getHeight());
    }

    void setFrame() {
        if (mErrorPopup != null) {
            TextView tv = (TextView) mErrorPopup.getContentView();
            chooseSize(mErrorPopup, mError, tv);
            mErrorPopup.update(mTextView, getErrorX(), getErrorY(),
                    mErrorPopup.getWidth(), mErrorPopup.getHeight());
        }
    }

    private int getWordStart(int offset) {
        // FIXME - For this and similar methods we're not doing anything to check if there's
        // a LocaleSpan in the text, this may be something we should try handling or checking for.
        int retOffset = getWordIteratorWithText().prevBoundary(offset);
        if (getWordIteratorWithText().isOnPunctuation(retOffset)) {
            // On punctuation boundary or within group of punctuation, find punctuation start.
            retOffset = getWordIteratorWithText().getPunctuationBeginning(offset);
        } else {
            // Not on a punctuation boundary, find the word start.
            retOffset = getWordIteratorWithText().getPrevWordBeginningOnTwoWordsBoundary(offset);
        }
        if (retOffset == BreakIterator.DONE) {
            return offset;
        }
        return retOffset;
    }

    private int getWordEnd(int offset) {
        int retOffset = getWordIteratorWithText().nextBoundary(offset);
        if (getWordIteratorWithText().isAfterPunctuation(retOffset)) {
            // On punctuation boundary or within group of punctuation, find punctuation end.
            retOffset = getWordIteratorWithText().getPunctuationEnd(offset);
        } else {
            // Not on a punctuation boundary, find the word end.
            retOffset = getWordIteratorWithText().getNextWordEndOnTwoWordBoundary(offset);
        }
        if (retOffset == BreakIterator.DONE) {
            return offset;
        }
        return retOffset;
    }

    private boolean needsToSelectAllToSelectWordOrParagraph() {
        if (mTextView.hasPasswordTransformationMethod()) {
            // Always select all on a password field.
            // Cut/copy menu entries are not available for passwords, but being able to select all
            // is however useful to delete or paste to replace the entire content.
            return true;
        }

        int inputType = mTextView.getInputType();
        int klass = inputType & InputType.TYPE_MASK_CLASS;
        int variation = inputType & InputType.TYPE_MASK_VARIATION;

        // Specific text field types: select the entire text for these
        if (klass == InputType.TYPE_CLASS_NUMBER ||
                klass == InputType.TYPE_CLASS_PHONE ||
                klass == InputType.TYPE_CLASS_DATETIME ||
                variation == InputType.TYPE_TEXT_VARIATION_URI ||
                variation == InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS ||
                variation == InputType.TYPE_TEXT_VARIATION_WEB_EMAIL_ADDRESS ||
                variation == InputType.TYPE_TEXT_VARIATION_FILTER) {
            return true;
        }
        return false;
    }

    /**
     * Adjusts selection to the word under last touch offset. Return true if the operation was
     * successfully performed.
     */
    private boolean selectCurrentWord() {
        if (!mTextView.canSelectText()) {
            return false;
        }

        if (needsToSelectAllToSelectWordOrParagraph()) {
            return mTextView.selectAllText();
        }

        long lastTouchOffsets = getLastTouchOffsets();
        final int minOffset = TextUtils.unpackRangeStartFromLong(lastTouchOffsets);
        final int maxOffset = TextUtils.unpackRangeEndFromLong(lastTouchOffsets);

        // Safety check in case standard touch event handling has been bypassed
        if (minOffset < 0 || minOffset > mTextView.getText().length()) return false;
        if (maxOffset < 0 || maxOffset > mTextView.getText().length()) return false;

        int selectionStart, selectionEnd;

        // If a URLSpan (web address, email, phone...) is found at that position, select it.
        URLSpan[] urlSpans = ((Spanned) mTextView.getText()).
                getSpans(minOffset, maxOffset, URLSpan.class);
        if (urlSpans.length >= 1) {
            URLSpan urlSpan = urlSpans[0];
            selectionStart = ((Spanned) mTextView.getText()).getSpanStart(urlSpan);
            selectionEnd = ((Spanned) mTextView.getText()).getSpanEnd(urlSpan);
        } else {
            // FIXME - We should check if there's a LocaleSpan in the text, this may be
            // something we should try handling or checking for.
            final WordIterator wordIterator = getWordIterator();
            wordIterator.setCharSequence(mTextView.getText(), minOffset, maxOffset);

            selectionStart = wordIterator.getBeginning(minOffset);
            selectionEnd = wordIterator.getEnd(maxOffset);

            if (selectionStart == BreakIterator.DONE || selectionEnd == BreakIterator.DONE ||
                    selectionStart == selectionEnd) {
                // Possible when the word iterator does not properly handle the text's language
                long range = getCharClusterRange(minOffset);
                selectionStart = TextUtils.unpackRangeStartFromLong(range);
                selectionEnd = TextUtils.unpackRangeEndFromLong(range);
            }
        }

        Selection.setSelection((Spannable) mTextView.getText(), selectionStart, selectionEnd);
        return selectionEnd > selectionStart;
    }

    /**
     * Adjusts selection to the paragraph under last touch offset. Return true if the operation was
     * successfully performed.
     */
    private boolean selectCurrentParagraph() {
        if (!mTextView.canSelectText()) {
            return false;
        }

        if (needsToSelectAllToSelectWordOrParagraph()) {
            return mTextView.selectAllText();
        }

        long lastTouchOffsets = getLastTouchOffsets();
        final int minLastTouchOffset = TextUtils.unpackRangeStartFromLong(lastTouchOffsets);
        final int maxLastTouchOffset = TextUtils.unpackRangeEndFromLong(lastTouchOffsets);

        final long paragraphsRange = getParagraphsRange(minLastTouchOffset, maxLastTouchOffset);
        final int start = TextUtils.unpackRangeStartFromLong(paragraphsRange);
        final int end = TextUtils.unpackRangeEndFromLong(paragraphsRange);
        if (start < end) {
            Selection.setSelection((Spannable) mTextView.getText(), start, end);
            return true;
        }
        return false;
    }

    /**
     * Get the minimum range of paragraphs that contains startOffset and endOffset.
     */
    private long getParagraphsRange(int startOffset, int endOffset) {
        final Layout layout = mTextView.getLayout();
        if (layout == null) {
            return TextUtils.packRangeInLong(-1, -1);
        }
        final CharSequence text = mTextView.getText();
        int minLine = layout.getLineForOffset(startOffset);
        // Search paragraph start.
        while (minLine > 0) {
            final int prevLineEndOffset = layout.getLineEnd(minLine - 1);
            if (text.charAt(prevLineEndOffset - 1) == '\n') {
                break;
            }
            minLine--;
        }
        int maxLine = layout.getLineForOffset(endOffset);
        // Search paragraph end.
        while (maxLine < layout.getLineCount() - 1) {
            final int lineEndOffset = layout.getLineEnd(maxLine);
            if (text.charAt(lineEndOffset - 1) == '\n') {
                break;
            }
            maxLine++;
        }
        return TextUtils.packRangeInLong(layout.getLineStart(minLine), layout.getLineEnd(maxLine));
    }

    void onLocaleChanged() {
        // Will be re-created on demand in getWordIterator and getWordIteratorWithText with the
        // proper new locale
        mWordIterator = null;
        mWordIteratorWithText = null;
    }

    /**
     * @hide
     */
    public WordIterator getWordIterator() {
        if (mWordIterator == null) {
            mWordIterator = new WordIterator(mTextView.getTextServicesLocale());
        }
        return mWordIterator;
    }

    private WordIterator getWordIteratorWithText() {
        if (mWordIteratorWithText == null) {
            mWordIteratorWithText = new WordIterator(mTextView.getTextServicesLocale());
            mUpdateWordIteratorText = true;
        }
        if (mUpdateWordIteratorText) {
            // FIXME - Shouldn't copy all of the text as only the area of the text relevant
            // to the user's selection is needed. A possible solution would be to
            // copy some number N of characters near the selection and then when the
            // user approaches N then we'd do another copy of the next N characters.
            CharSequence text = mTextView.getText();
            mWordIteratorWithText.setCharSequence(text, 0, text.length());
            mUpdateWordIteratorText = false;
        }
        return mWordIteratorWithText;
    }

    private int getNextCursorOffset(int offset, boolean findAfterGivenOffset) {
        final Layout layout = mTextView.getLayout();
        if (layout == null) return offset;
        return findAfterGivenOffset == layout.isRtlCharAt(offset) ?
                layout.getOffsetToLeftOf(offset) : layout.getOffsetToRightOf(offset);
    }

    private long getCharClusterRange(int offset) {
        final int textLength = mTextView.getText().length();
        if (offset < textLength) {
            final int clusterEndOffset = getNextCursorOffset(offset, true);
            return TextUtils.packRangeInLong(
                    getNextCursorOffset(clusterEndOffset, false), clusterEndOffset);
        }
        if (offset - 1 >= 0) {
            final int clusterStartOffset = getNextCursorOffset(offset, false);
            return TextUtils.packRangeInLong(clusterStartOffset,
                    getNextCursorOffset(clusterStartOffset, true));
        }
        return TextUtils.packRangeInLong(offset, offset);
    }

    private boolean touchPositionIsInSelection() {
        int selectionStart = mTextView.getSelectionStart();
        int selectionEnd = mTextView.getSelectionEnd();

        if (selectionStart == selectionEnd) {
            return false;
        }

        if (selectionStart > selectionEnd) {
            int tmp = selectionStart;
            selectionStart = selectionEnd;
            selectionEnd = tmp;
            Selection.setSelection((Spannable) mTextView.getText(), selectionStart, selectionEnd);
        }

        SelectionModifierCursorController selectionController = getSelectionController();
        int minOffset = selectionController.getMinTouchOffset();
        int maxOffset = selectionController.getMaxTouchOffset();

        return ((minOffset >= selectionStart) && (maxOffset < selectionEnd));
    }

    private PositionListener getPositionListener() {
        if (mPositionListener == null) {
            mPositionListener = new PositionListener();
        }
        return mPositionListener;
    }

    private interface TextViewPositionListener {
        public void updatePosition(int parentPositionX, int parentPositionY,
                boolean parentPositionChanged, boolean parentScrolled);
    }

    private boolean isPositionVisible(final float positionX, final float positionY) {
        synchronized (TEMP_POSITION) {
            final float[] position = TEMP_POSITION;
            position[0] = positionX;
            position[1] = positionY;
            View view = mTextView;

            while (view != null) {
                if (view != mTextView) {
                    // Local scroll is already taken into account in positionX/Y
                    position[0] -= view.getScrollX();
                    position[1] -= view.getScrollY();
                }

                if (position[0] < 0 || position[1] < 0 ||
                        position[0] > view.getWidth() || position[1] > view.getHeight()) {
                    return false;
                }

                if (!view.getMatrix().isIdentity()) {
                    view.getMatrix().mapPoints(position);
                }

                position[0] += view.getLeft();
                position[1] += view.getTop();

                final ViewParent parent = view.getParent();
                if (parent instanceof View) {
                    view = (View) parent;
                } else {
                    // We've reached the ViewRoot, stop iterating
                    view = null;
                }
            }
        }

        // We've been able to walk up the view hierarchy and the position was never clipped
        return true;
    }

    private boolean isOffsetVisible(int offset) {
        Layout layout = mTextView.getLayout();
        if (layout == null) return false;

        final int line = layout.getLineForOffset(offset);
        final int lineBottom = layout.getLineBottom(line);
        final int primaryHorizontal = (int) layout.getPrimaryHorizontal(offset);
        return isPositionVisible(primaryHorizontal + mTextView.viewportToContentHorizontalOffset(),
                lineBottom + mTextView.viewportToContentVerticalOffset());
    }

    /** Returns true if the screen coordinates position (x,y) corresponds to a character displayed
     * in the view. Returns false when the position is in the empty space of left/right of text.
     */
    private boolean isPositionOnText(float x, float y) {
        Layout layout = mTextView.getLayout();
        if (layout == null) return false;

        final int line = mTextView.getLineAtCoordinate(y);
        x = mTextView.convertToLocalHorizontalCoordinate(x);

        if (x < layout.getLineLeft(line)) return false;
        if (x > layout.getLineRight(line)) return false;
        return true;
    }

    private void startDragAndDrop() {
        // TODO: Fix drag and drop in full screen extracted mode.
        if (mTextView.isInExtractedMode()) {
            return;
        }
        final int start = mTextView.getSelectionStart();
        final int end = mTextView.getSelectionEnd();
        CharSequence selectedText = mTextView.getTransformedText(start, end);
        ClipData data = ClipData.newPlainText(null, selectedText);
        DragLocalState localState = new DragLocalState(mTextView, start, end);
        mTextView.startDragAndDrop(data, getTextThumbnailBuilder(start, end), localState,
                View.DRAG_FLAG_GLOBAL);
        stopTextActionMode();
        if (hasSelectionController()) {
            getSelectionController().resetTouchOffsets();
        }
    }

    public boolean performLongClick(boolean handled) {
        // Long press in empty space moves cursor and starts the insertion action mode.
        if (!handled && !isPositionOnText(mLastDownPositionX, mLastDownPositionY) &&
                mInsertionControllerEnabled) {
            final int offset = mTextView.getOffsetForPosition(mLastDownPositionX,
                    mLastDownPositionY);
            Selection.setSelection((Spannable) mTextView.getText(), offset);
            getInsertionController().show();
            mIsInsertionActionModeStartPending = true;
            handled = true;
        }

        if (!handled && mTextActionMode != null) {
            if (touchPositionIsInSelection()) {
                startDragAndDrop();
            } else {
                stopTextActionMode();
                selectCurrentWordAndStartDrag();
            }
            handled = true;
        }

        // Start a new selection
        if (!handled) {
            handled = selectCurrentWordAndStartDrag();
        }

        return handled;
    }

    private long getLastTouchOffsets() {
        SelectionModifierCursorController selectionController = getSelectionController();
        final int minOffset = selectionController.getMinTouchOffset();
        final int maxOffset = selectionController.getMaxTouchOffset();
        return TextUtils.packRangeInLong(minOffset, maxOffset);
    }

    void onFocusChanged(boolean focused, int direction) {
        mShowCursor = SystemClock.uptimeMillis();
        ensureEndedBatchEdit();

        if (focused) {
            int selStart = mTextView.getSelectionStart();
            int selEnd = mTextView.getSelectionEnd();

            // SelectAllOnFocus fields are highlighted and not selected. Do not start text selection
            // mode for these, unless there was a specific selection already started.
            final boolean isFocusHighlighted = mSelectAllOnFocus && selStart == 0 &&
                    selEnd == mTextView.getText().length();

            mCreatedWithASelection = mFrozenWithFocus && mTextView.hasSelection() &&
                    !isFocusHighlighted;

            if (!mFrozenWithFocus || (selStart < 0 || selEnd < 0)) {
                // If a tap was used to give focus to that view, move cursor at tap position.
                // Has to be done before onTakeFocus, which can be overloaded.
                final int lastTapPosition = getLastTapPosition();
                if (lastTapPosition >= 0) {
                    Selection.setSelection((Spannable) mTextView.getText(), lastTapPosition);
                }

                // Note this may have to be moved out of the Editor class
                MovementMethod mMovement = mTextView.getMovementMethod();
                if (mMovement != null) {
                    mMovement.onTakeFocus(mTextView, (Spannable) mTextView.getText(), direction);
                }

                // The DecorView does not have focus when the 'Done' ExtractEditText button is
                // pressed. Since it is the ViewAncestor's mView, it requests focus before
                // ExtractEditText clears focus, which gives focus to the ExtractEditText.
                // This special case ensure that we keep current selection in that case.
                // It would be better to know why the DecorView does not have focus at that time.
                if (((mTextView.isInExtractedMode()) || mSelectionMoved) &&
                        selStart >= 0 && selEnd >= 0) {
                    /*
                     * Someone intentionally set the selection, so let them
                     * do whatever it is that they wanted to do instead of
                     * the default on-focus behavior.  We reset the selection
                     * here instead of just skipping the onTakeFocus() call
                     * because some movement methods do something other than
                     * just setting the selection in theirs and we still
                     * need to go through that path.
                     */
                    Selection.setSelection((Spannable) mTextView.getText(), selStart, selEnd);
                }

                if (mSelectAllOnFocus) {
                    mTextView.selectAllText();
                }

                mTouchFocusSelected = true;
            }

            mFrozenWithFocus = false;
            mSelectionMoved = false;

            if (mError != null) {
                showError();
            }

            makeBlink();
        } else {
            if (mError != null) {
                hideError();
            }
            // Don't leave us in the middle of a batch edit.
            mTextView.onEndBatchEdit();

            if (mTextView.isInExtractedMode()) {
                hideCursorAndSpanControllers();
                stopTextActionModeWithPreservingSelection();
            } else {
                hideCursorAndSpanControllers();
                if (mTextView.isTemporarilyDetached()) {
                    stopTextActionModeWithPreservingSelection();
                } else {
                    stopTextActionMode();
                }
                downgradeEasyCorrectionSpans();
            }
            // No need to create the controller
            if (mSelectionModifierCursorController != null) {
                mSelectionModifierCursorController.resetTouchOffsets();
            }
        }
    }

    /**
     * Downgrades to simple suggestions all the easy correction spans that are not a spell check
     * span.
     */
    private void downgradeEasyCorrectionSpans() {
        CharSequence text = mTextView.getText();
        if (text instanceof Spannable) {
            Spannable spannable = (Spannable) text;
            SuggestionSpan[] suggestionSpans = spannable.getSpans(0,
                    spannable.length(), SuggestionSpan.class);
            for (int i = 0; i < suggestionSpans.length; i++) {
                int flags = suggestionSpans[i].getFlags();
                if ((flags & SuggestionSpan.FLAG_EASY_CORRECT) != 0
                        && (flags & SuggestionSpan.FLAG_MISSPELLED) == 0) {
                    flags &= ~SuggestionSpan.FLAG_EASY_CORRECT;
                    suggestionSpans[i].setFlags(flags);
                }
            }
        }
    }

    void sendOnTextChanged(int start, int after) {
        updateSpellCheckSpans(start, start + after, false);

        // Flip flag to indicate the word iterator needs to have the text reset.
        mUpdateWordIteratorText = true;

        // Hide the controllers as soon as text is modified (typing, procedural...)
        // We do not hide the span controllers, since they can be added when a new text is
        // inserted into the text view (voice IME).
        hideCursorControllers();
        // Reset drag accelerator.
        if (mSelectionModifierCursorController != null) {
            mSelectionModifierCursorController.resetTouchOffsets();
        }
        stopTextActionMode();
    }

    private int getLastTapPosition() {
        // No need to create the controller at that point, no last tap position saved
        if (mSelectionModifierCursorController != null) {
            int lastTapPosition = mSelectionModifierCursorController.getMinTouchOffset();
            if (lastTapPosition >= 0) {
                // Safety check, should not be possible.
                if (lastTapPosition > mTextView.getText().length()) {
                    lastTapPosition = mTextView.getText().length();
                }
                return lastTapPosition;
            }
        }

        return -1;
    }

    void onWindowFocusChanged(boolean hasWindowFocus) {
        if (hasWindowFocus) {
            if (mBlink != null) {
                mBlink.uncancel();
                makeBlink();
            }
            final InputMethodManager imm = InputMethodManager.peekInstance();
            if (mTextView.hasSelection() && !extractedTextModeWillBeStarted()) {
                refreshTextActionMode();
            }
        } else {
            if (mBlink != null) {
                mBlink.cancel();
            }
            if (mInputContentType != null) {
                mInputContentType.enterDown = false;
            }
            // Order matters! Must be done before onParentLostFocus to rely on isShowingUp
            hideCursorAndSpanControllers();
            stopTextActionModeWithPreservingSelection();
            if (mSuggestionsPopupWindow != null) {
                mSuggestionsPopupWindow.onParentLostFocus();
            }

            // Don't leave us in the middle of a batch edit. Same as in onFocusChanged
            ensureEndedBatchEdit();
        }
    }

    private void updateTapState(MotionEvent event) {
        final int action = event.getActionMasked();
        if (action == MotionEvent.ACTION_DOWN) {
            final boolean isMouse = event.isFromSource(InputDevice.SOURCE_MOUSE);
            // Detect double tap and triple click.
            if (((mTapState == TAP_STATE_FIRST_TAP)
                    || ((mTapState == TAP_STATE_DOUBLE_TAP) && isMouse))
                        && (SystemClock.uptimeMillis() - mLastTouchUpTime) <=
                                ViewConfiguration.getDoubleTapTimeout()) {
                if (mTapState == TAP_STATE_FIRST_TAP) {
                    mTapState = TAP_STATE_DOUBLE_TAP;
                } else {
                    mTapState = TAP_STATE_TRIPLE_CLICK;
                }
            } else {
                mTapState = TAP_STATE_FIRST_TAP;
            }
        }
        if (action == MotionEvent.ACTION_UP) {
            mLastTouchUpTime = SystemClock.uptimeMillis();
        }
    }

    private boolean shouldFilterOutTouchEvent(MotionEvent event) {
        if (!event.isFromSource(InputDevice.SOURCE_MOUSE)) {
            return false;
        }
        final boolean primaryButtonStateChanged =
                ((mLastButtonState ^ event.getButtonState()) & MotionEvent.BUTTON_PRIMARY) != 0;
        final int action = event.getActionMasked();
        if ((action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_UP)
                && !primaryButtonStateChanged) {
            return true;
        }
        if (action == MotionEvent.ACTION_MOVE
                && !event.isButtonPressed(MotionEvent.BUTTON_PRIMARY)) {
            return true;
        }
        return false;
    }

    void onTouchEvent(MotionEvent event) {
        final boolean filterOutEvent = shouldFilterOutTouchEvent(event);
        mLastButtonState = event.getButtonState();
        if (filterOutEvent) {
            if (event.getActionMasked() == MotionEvent.ACTION_UP) {
                mDiscardNextActionUp = true;
            }
            return;
        }
        updateTapState(event);
        updateFloatingToolbarVisibility(event);

        if (hasSelectionController()) {
            getSelectionController().onTouchEvent(event);
        }

        if (mShowSuggestionRunnable != null) {
            mTextView.removeCallbacks(mShowSuggestionRunnable);
            mShowSuggestionRunnable = null;
        }

        if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
            mLastDownPositionX = event.getX();
            mLastDownPositionY = event.getY();

            // Reset this state; it will be re-set if super.onTouchEvent
            // causes focus to move to the view.
            mTouchFocusSelected = false;
            mIgnoreActionUpEvent = false;
        }
    }

    private void updateFloatingToolbarVisibility(MotionEvent event) {
        if (mTextActionMode != null) {
            switch (event.getActionMasked()) {
                case MotionEvent.ACTION_MOVE:
                    hideFloatingToolbar();
                    break;
                case MotionEvent.ACTION_UP:  // fall through
                case MotionEvent.ACTION_CANCEL:
                    showFloatingToolbar();
            }
        }
    }

    private void hideFloatingToolbar() {
        if (mTextActionMode != null) {
            mTextView.removeCallbacks(mShowFloatingToolbar);
            mTextActionMode.hide(ActionMode.DEFAULT_HIDE_DURATION);
        }
    }

    private void showFloatingToolbar() {
        if (mTextActionMode != null) {
            // Delay "show" so it doesn't interfere with click confirmations
            // or double-clicks that could "dismiss" the floating toolbar.
            int delay = ViewConfiguration.getDoubleTapTimeout();
            mTextView.postDelayed(mShowFloatingToolbar, delay);
        }
    }

    public void beginBatchEdit() {
        mInBatchEditControllers = true;
        final InputMethodState ims = mInputMethodState;
        if (ims != null) {
            int nesting = ++ims.mBatchEditNesting;
            if (nesting == 1) {
                ims.mCursorChanged = false;
                ims.mChangedDelta = 0;
                if (ims.mContentChanged) {
                    // We already have a pending change from somewhere else,
                    // so turn this into a full update.
                    ims.mChangedStart = 0;
                    ims.mChangedEnd = mTextView.getText().length();
                } else {
                    ims.mChangedStart = EXTRACT_UNKNOWN;
                    ims.mChangedEnd = EXTRACT_UNKNOWN;
                    ims.mContentChanged = false;
                }
                mUndoInputFilter.beginBatchEdit();
                mTextView.onBeginBatchEdit();
            }
        }
    }

    public void endBatchEdit() {
        mInBatchEditControllers = false;
        final InputMethodState ims = mInputMethodState;
        if (ims != null) {
            int nesting = --ims.mBatchEditNesting;
            if (nesting == 0) {
                finishBatchEdit(ims);
            }
        }
    }

    void ensureEndedBatchEdit() {
        final InputMethodState ims = mInputMethodState;
        if (ims != null && ims.mBatchEditNesting != 0) {
            ims.mBatchEditNesting = 0;
            finishBatchEdit(ims);
        }
    }

    void finishBatchEdit(final InputMethodState ims) {
        mTextView.onEndBatchEdit();
        mUndoInputFilter.endBatchEdit();

        if (ims.mContentChanged || ims.mSelectionModeChanged) {
            mTextView.updateAfterEdit();
            reportExtractedText();
        } else if (ims.mCursorChanged) {
            // Cheesy way to get us to report the current cursor location.
            mTextView.invalidateCursor();
        }
        // sendUpdateSelection knows to avoid sending if the selection did
        // not actually change.
        sendUpdateSelection();

        // Show drag handles if they were blocked by batch edit mode.
        if (mTextActionMode != null) {
            final CursorController cursorController = mTextView.hasSelection() ?
                    getSelectionController() : getInsertionController();
            if (cursorController != null && !cursorController.isActive()
                    && !cursorController.isCursorBeingModified()) {
                cursorController.show();
            }
        }
    }

    static final int EXTRACT_NOTHING = -2;
    static final int EXTRACT_UNKNOWN = -1;

    boolean extractText(ExtractedTextRequest request, ExtractedText outText) {
        return extractTextInternal(request, EXTRACT_UNKNOWN, EXTRACT_UNKNOWN,
                EXTRACT_UNKNOWN, outText);
    }

    private boolean extractTextInternal(@Nullable ExtractedTextRequest request,
            int partialStartOffset, int partialEndOffset, int delta,
            @Nullable ExtractedText outText) {
        if (request == null || outText == null) {
            return false;
        }

        final CharSequence content = mTextView.getText();
        if (content == null) {
            return false;
        }

        if (partialStartOffset != EXTRACT_NOTHING) {
            final int N = content.length();
            if (partialStartOffset < 0) {
                outText.partialStartOffset = outText.partialEndOffset = -1;
                partialStartOffset = 0;
                partialEndOffset = N;
            } else {
                // Now use the delta to determine the actual amount of text
                // we need.
                partialEndOffset += delta;
                // Adjust offsets to ensure we contain full spans.
                if (content instanceof Spanned) {
                    Spanned spanned = (Spanned)content;
                    Object[] spans = spanned.getSpans(partialStartOffset,
                            partialEndOffset, ParcelableSpan.class);
                    int i = spans.length;
                    while (i > 0) {
                        i--;
                        int j = spanned.getSpanStart(spans[i]);
                        if (j < partialStartOffset) partialStartOffset = j;
                        j = spanned.getSpanEnd(spans[i]);
                        if (j > partialEndOffset) partialEndOffset = j;
                    }
                }
                outText.partialStartOffset = partialStartOffset;
                outText.partialEndOffset = partialEndOffset - delta;

                if (partialStartOffset > N) {
                    partialStartOffset = N;
                } else if (partialStartOffset < 0) {
                    partialStartOffset = 0;
                }
                if (partialEndOffset > N) {
                    partialEndOffset = N;
                } else if (partialEndOffset < 0) {
                    partialEndOffset = 0;
                }
            }
            if ((request.flags&InputConnection.GET_TEXT_WITH_STYLES) != 0) {
                outText.text = content.subSequence(partialStartOffset,
                        partialEndOffset);
            } else {
                outText.text = TextUtils.substring(content, partialStartOffset,
                        partialEndOffset);
            }
        } else {
            outText.partialStartOffset = 0;
            outText.partialEndOffset = 0;
            outText.text = "";
        }
        outText.flags = 0;
        if (MetaKeyKeyListener.getMetaState(content, MetaKeyKeyListener.META_SELECTING) != 0) {
            outText.flags |= ExtractedText.FLAG_SELECTING;
        }
        if (mTextView.isSingleLine()) {
            outText.flags |= ExtractedText.FLAG_SINGLE_LINE;
        }
        outText.startOffset = 0;
        outText.selectionStart = mTextView.getSelectionStart();
        outText.selectionEnd = mTextView.getSelectionEnd();
        return true;
    }

    boolean reportExtractedText() {
        final Editor.InputMethodState ims = mInputMethodState;
        if (ims != null) {
            final boolean contentChanged = ims.mContentChanged;
            if (contentChanged || ims.mSelectionModeChanged) {
                ims.mContentChanged = false;
                ims.mSelectionModeChanged = false;
                final ExtractedTextRequest req = ims.mExtractedTextRequest;
                if (req != null) {
                    InputMethodManager imm = InputMethodManager.peekInstance();
                    if (imm != null) {
                        if (TextView.DEBUG_EXTRACT) Log.v(TextView.LOG_TAG,
                                "Retrieving extracted start=" + ims.mChangedStart +
                                " end=" + ims.mChangedEnd +
                                " delta=" + ims.mChangedDelta);
                        if (ims.mChangedStart < 0 && !contentChanged) {
                            ims.mChangedStart = EXTRACT_NOTHING;
                        }
                        if (extractTextInternal(req, ims.mChangedStart, ims.mChangedEnd,
                                ims.mChangedDelta, ims.mExtractedText)) {
                            if (TextView.DEBUG_EXTRACT) Log.v(TextView.LOG_TAG,
                                    "Reporting extracted start=" +
                                    ims.mExtractedText.partialStartOffset +
                                    " end=" + ims.mExtractedText.partialEndOffset +
                                    ": " + ims.mExtractedText.text);

                            imm.updateExtractedText(mTextView, req.token, ims.mExtractedText);
                            ims.mChangedStart = EXTRACT_UNKNOWN;
                            ims.mChangedEnd = EXTRACT_UNKNOWN;
                            ims.mChangedDelta = 0;
                            ims.mContentChanged = false;
                            return true;
                        }
                    }
                }
            }
        }
        return false;
    }

    private void sendUpdateSelection() {
        if (null != mInputMethodState && mInputMethodState.mBatchEditNesting <= 0) {
            final InputMethodManager imm = InputMethodManager.peekInstance();
            if (null != imm) {
                final int selectionStart = mTextView.getSelectionStart();
                final int selectionEnd = mTextView.getSelectionEnd();
                int candStart = -1;
                int candEnd = -1;
                if (mTextView.getText() instanceof Spannable) {
                    final Spannable sp = (Spannable) mTextView.getText();
                    candStart = EditableInputConnection.getComposingSpanStart(sp);
                    candEnd = EditableInputConnection.getComposingSpanEnd(sp);
                }
                // InputMethodManager#updateSelection skips sending the message if
                // none of the parameters have changed since the last time we called it.
                imm.updateSelection(mTextView,
                        selectionStart, selectionEnd, candStart, candEnd);
            }
        }
    }

    void onDraw(Canvas canvas, Layout layout, Path highlight, Paint highlightPaint,
            int cursorOffsetVertical) {
        final int selectionStart = mTextView.getSelectionStart();
        final int selectionEnd = mTextView.getSelectionEnd();

        final InputMethodState ims = mInputMethodState;
        if (ims != null && ims.mBatchEditNesting == 0) {
            InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null) {
                if (imm.isActive(mTextView)) {
                    if (ims.mContentChanged || ims.mSelectionModeChanged) {
                        // We are in extract mode and the content has changed
                        // in some way... just report complete new text to the
                        // input method.
                        reportExtractedText();
                    }
                }
            }
        }

        if (mCorrectionHighlighter != null) {
            mCorrectionHighlighter.draw(canvas, cursorOffsetVertical);
        }

        if (highlight != null && selectionStart == selectionEnd && mCursorCount > 0) {
            drawCursor(canvas, cursorOffsetVertical);
            // Rely on the drawable entirely, do not draw the cursor line.
            // Has to be done after the IMM related code above which relies on the highlight.
            highlight = null;
        }

        if (mTextView.canHaveDisplayList() && canvas.isHardwareAccelerated()) {
            drawHardwareAccelerated(canvas, layout, highlight, highlightPaint,
                    cursorOffsetVertical);
        } else {
            layout.draw(canvas, highlight, highlightPaint, cursorOffsetVertical);
        }
    }

    private void drawHardwareAccelerated(Canvas canvas, Layout layout, Path highlight,
            Paint highlightPaint, int cursorOffsetVertical) {
        final long lineRange = layout.getLineRangeForDraw(canvas);
        int firstLine = TextUtils.unpackRangeStartFromLong(lineRange);
        int lastLine = TextUtils.unpackRangeEndFromLong(lineRange);
        if (lastLine < 0) return;

        layout.drawBackground(canvas, highlight, highlightPaint, cursorOffsetVertical,
                firstLine, lastLine);

        if (layout instanceof DynamicLayout) {
            if (mTextRenderNodes == null) {
                mTextRenderNodes = ArrayUtils.emptyArray(TextRenderNode.class);
            }

            DynamicLayout dynamicLayout = (DynamicLayout) layout;
            int[] blockEndLines = dynamicLayout.getBlockEndLines();
            int[] blockIndices = dynamicLayout.getBlockIndices();
            final int numberOfBlocks = dynamicLayout.getNumberOfBlocks();
            final int indexFirstChangedBlock = dynamicLayout.getIndexFirstChangedBlock();

            int endOfPreviousBlock = -1;
            int searchStartIndex = 0;
            for (int i = 0; i < numberOfBlocks; i++) {
                int blockEndLine = blockEndLines[i];
                int blockIndex = blockIndices[i];

                final boolean blockIsInvalid = blockIndex == DynamicLayout.INVALID_BLOCK_INDEX;
                if (blockIsInvalid) {
                    blockIndex = getAvailableDisplayListIndex(blockIndices, numberOfBlocks,
                            searchStartIndex);
                    // Note how dynamic layout's internal block indices get updated from Editor
                    blockIndices[i] = blockIndex;
                    if (mTextRenderNodes[blockIndex] != null) {
                        mTextRenderNodes[blockIndex].isDirty = true;
                    }
                    searchStartIndex = blockIndex + 1;
                }

                if (mTextRenderNodes[blockIndex] == null) {
                    mTextRenderNodes[blockIndex] =
                            new TextRenderNode("Text " + blockIndex);
                }

                final boolean blockDisplayListIsInvalid = mTextRenderNodes[blockIndex].needsRecord();
                RenderNode blockDisplayList = mTextRenderNodes[blockIndex].renderNode;
                if (i >= indexFirstChangedBlock || blockDisplayListIsInvalid) {
                    final int blockBeginLine = endOfPreviousBlock + 1;
                    final int top = layout.getLineTop(blockBeginLine);
                    final int bottom = layout.getLineBottom(blockEndLine);
                    int left = 0;
                    int right = mTextView.getWidth();
                    if (mTextView.getHorizontallyScrolling()) {
                        float min = Float.MAX_VALUE;
                        float max = Float.MIN_VALUE;
                        for (int line = blockBeginLine; line <= blockEndLine; line++) {
                            min = Math.min(min, layout.getLineLeft(line));
                            max = Math.max(max, layout.getLineRight(line));
                        }
                        left = (int) min;
                        right = (int) (max + 0.5f);
                    }

                    // Rebuild display list if it is invalid
                    if (blockDisplayListIsInvalid) {
                        final DisplayListCanvas displayListCanvas = blockDisplayList.start(
                                right - left, bottom - top);
                        try {
                            // drawText is always relative to TextView's origin, this translation
                            // brings this range of text back to the top left corner of the viewport
                            displayListCanvas.translate(-left, -top);
                            layout.drawText(displayListCanvas, blockBeginLine, blockEndLine);
                            mTextRenderNodes[blockIndex].isDirty = false;
                            // No need to untranslate, previous context is popped after
                            // drawDisplayList
                        } finally {
                            blockDisplayList.end(displayListCanvas);
                            // Same as drawDisplayList below, handled by our TextView's parent
                            blockDisplayList.setClipToBounds(false);
                        }
                    }

                    // Valid disply list whose index is >= indexFirstChangedBlock
                    // only needs to update its drawing location.
                    blockDisplayList.setLeftTopRightBottom(left, top, right, bottom);
                }

                ((DisplayListCanvas) canvas).drawRenderNode(blockDisplayList);

                endOfPreviousBlock = blockEndLine;
            }

            dynamicLayout.setIndexFirstChangedBlock(numberOfBlocks);
        } else {
            // Boring layout is used for empty and hint text
            layout.drawText(canvas, firstLine, lastLine);
        }
    }

    private int getAvailableDisplayListIndex(int[] blockIndices, int numberOfBlocks,
            int searchStartIndex) {
        int length = mTextRenderNodes.length;
        for (int i = searchStartIndex; i < length; i++) {
            boolean blockIndexFound = false;
            for (int j = 0; j < numberOfBlocks; j++) {
                if (blockIndices[j] == i) {
                    blockIndexFound = true;
                    break;
                }
            }
            if (blockIndexFound) continue;
            return i;
        }

        // No available index found, the pool has to grow
        mTextRenderNodes = GrowingArrayUtils.append(mTextRenderNodes, length, null);
        return length;
    }

    private void drawCursor(Canvas canvas, int cursorOffsetVertical) {
        final boolean translate = cursorOffsetVertical != 0;
        if (translate) canvas.translate(0, cursorOffsetVertical);
        for (int i = 0; i < mCursorCount; i++) {
            mCursorDrawable[i].draw(canvas);
        }
        if (translate) canvas.translate(0, -cursorOffsetVertical);
    }

    void invalidateHandlesAndActionMode() {
        if (mSelectionModifierCursorController != null) {
            mSelectionModifierCursorController.invalidateHandles();
        }
        if (mInsertionPointCursorController != null) {
            mInsertionPointCursorController.invalidateHandle();
        }
        if (mTextActionMode != null) {
            mTextActionMode.invalidate();
        }
    }

    /**
     * Invalidates all the sub-display lists that overlap the specified character range
     */
    void invalidateTextDisplayList(Layout layout, int start, int end) {
        if (mTextRenderNodes != null && layout instanceof DynamicLayout) {
            final int firstLine = layout.getLineForOffset(start);
            final int lastLine = layout.getLineForOffset(end);

            DynamicLayout dynamicLayout = (DynamicLayout) layout;
            int[] blockEndLines = dynamicLayout.getBlockEndLines();
            int[] blockIndices = dynamicLayout.getBlockIndices();
            final int numberOfBlocks = dynamicLayout.getNumberOfBlocks();

            int i = 0;
            // Skip the blocks before firstLine
            while (i < numberOfBlocks) {
                if (blockEndLines[i] >= firstLine) break;
                i++;
            }

            // Invalidate all subsequent blocks until lastLine is passed
            while (i < numberOfBlocks) {
                final int blockIndex = blockIndices[i];
                if (blockIndex != DynamicLayout.INVALID_BLOCK_INDEX) {
                    mTextRenderNodes[blockIndex].isDirty = true;
                }
                if (blockEndLines[i] >= lastLine) break;
                i++;
            }
        }
    }

    void invalidateTextDisplayList() {
        if (mTextRenderNodes != null) {
            for (int i = 0; i < mTextRenderNodes.length; i++) {
                if (mTextRenderNodes[i] != null) mTextRenderNodes[i].isDirty = true;
            }
        }
    }

    void updateCursorsPositions() {
        if (mTextView.mCursorDrawableRes == 0) {
            mCursorCount = 0;
            return;
        }

        Layout layout = mTextView.getLayout();
        final int offset = mTextView.getSelectionStart();
        final int line = layout.getLineForOffset(offset);
        final int top = layout.getLineTop(line);
        final int bottom = layout.getLineTop(line + 1);

        mCursorCount = layout.isLevelBoundary(offset) ? 2 : 1;

        int middle = bottom;
        if (mCursorCount == 2) {
            // Similar to what is done in {@link Layout.#getCursorPath(int, Path, CharSequence)}
            middle = (top + bottom) >> 1;
        }

        boolean clamped = layout.shouldClampCursor(line);
        updateCursorPosition(0, top, middle, layout.getPrimaryHorizontal(offset, clamped));

        if (mCursorCount == 2) {
            updateCursorPosition(1, middle, bottom, layout.getSecondaryHorizontal(offset, clamped));
        }
    }

    void refreshTextActionMode() {
        if (extractedTextModeWillBeStarted()) {
            mRestartActionModeOnNextRefresh = false;
            return;
        }
        final boolean hasSelection = mTextView.hasSelection();
        final SelectionModifierCursorController selectionController = getSelectionController();
        final InsertionPointCursorController insertionController = getInsertionController();
        if ((selectionController != null && selectionController.isCursorBeingModified())
                || (insertionController != null && insertionController.isCursorBeingModified())) {
            // ActionMode should be managed by the currently active cursor controller.
            mRestartActionModeOnNextRefresh = false;
            return;
        }
        if (hasSelection) {
            hideInsertionPointCursorController();
            if (mTextActionMode == null) {
                if (mRestartActionModeOnNextRefresh) {
                    // To avoid distraction, newly start action mode only when selection action
                    // mode is being restarted.
                    startSelectionActionMode();
                }
            } else if (selectionController == null || !selectionController.isActive()) {
                // Insertion action mode is active. Avoid dismissing the selection.
                stopTextActionModeWithPreservingSelection();
                startSelectionActionMode();
            } else {
                mTextActionMode.invalidateContentRect();
            }
        } else {
            // Insertion action mode is started only when insertion controller is explicitly
            // activated.
            if (insertionController == null || !insertionController.isActive()) {
                stopTextActionMode();
            } else if (mTextActionMode != null) {
                mTextActionMode.invalidateContentRect();
            }
        }
        mRestartActionModeOnNextRefresh = false;
    }

    /**
     * Start an Insertion action mode.
     */
    void startInsertionActionMode() {
        if (mInsertionActionModeRunnable != null) {
            mTextView.removeCallbacks(mInsertionActionModeRunnable);
        }
        if (extractedTextModeWillBeStarted()) {
            return;
        }
        stopTextActionMode();

        ActionMode.Callback actionModeCallback =
                new TextActionModeCallback(false /* hasSelection */);
        mTextActionMode = mTextView.startActionMode(
                actionModeCallback, ActionMode.TYPE_FLOATING);
        if (mTextActionMode != null && getInsertionController() != null) {
            getInsertionController().show();
        }
    }

    /**
     * Starts a Selection Action Mode with the current selection and ensures the selection handles
     * are shown if there is a selection. This should be used when the mode is started from a
     * non-touch event.
     *
     * @return true if the selection mode was actually started.
     */
    boolean startSelectionActionMode() {
        boolean selectionStarted = startSelectionActionModeInternal();
        if (selectionStarted) {
            getSelectionController().show();
        }
        mRestartActionModeOnNextRefresh = false;
        return selectionStarted;
    }

    /**
     * If the TextView allows text selection, selects the current word when no existing selection
     * was available and starts a drag.
     *
     * @return true if the drag was started.
     */
    private boolean selectCurrentWordAndStartDrag() {
        if (mInsertionActionModeRunnable != null) {
            mTextView.removeCallbacks(mInsertionActionModeRunnable);
        }
        if (extractedTextModeWillBeStarted()) {
            return false;
        }
        if (!checkField()) {
            return false;
        }
        if (!mTextView.hasSelection() && !selectCurrentWord()) {
            // No selection and cannot select a word.
            return false;
        }
        stopTextActionModeWithPreservingSelection();
        getSelectionController().enterDrag(
                SelectionModifierCursorController.DRAG_ACCELERATOR_MODE_WORD);
        return true;
    }

    /**
     * Checks whether a selection can be performed on the current TextView.
     *
     * @return true if a selection can be performed
     */
    boolean checkField() {
        if (!mTextView.canSelectText() || !mTextView.requestFocus()) {
            Log.w(TextView.LOG_TAG,
                    "TextView does not support text selection. Selection cancelled.");
            return false;
        }
        return true;
    }

    private boolean startSelectionActionModeInternal() {
        if (extractedTextModeWillBeStarted()) {
            return false;
        }
        if (mTextActionMode != null) {
            // Text action mode is already started
            mTextActionMode.invalidate();
            return false;
        }

        if (!checkField() || !mTextView.hasSelection()) {
            return false;
        }

        ActionMode.Callback actionModeCallback =
                new TextActionModeCallback(true /* hasSelection */);
        mTextActionMode = mTextView.startActionMode(actionModeCallback, ActionMode.TYPE_FLOATING);

        final boolean selectionStarted = mTextActionMode != null;
        if (selectionStarted && !mTextView.isTextSelectable() && mShowSoftInputOnFocus) {
            // Show the IME to be able to replace text, except when selecting non editable text.
            final InputMethodManager imm = InputMethodManager.peekInstance();
            if (imm != null) {
                imm.showSoftInput(mTextView, 0, null);
            }
        }
        return selectionStarted;
    }

    boolean extractedTextModeWillBeStarted() {
        if (!(mTextView.isInExtractedMode())) {
            final InputMethodManager imm = InputMethodManager.peekInstance();
            return  imm != null && imm.isFullscreenMode();
        }
        return false;
    }

    /**
     * @return <code>true</code> if it's reasonable to offer to show suggestions depending on
     * the current cursor position or selection range. This method is consistent with the
     * method to show suggestions {@link SuggestionsPopupWindow#updateSuggestions}.
     */
    private boolean shouldOfferToShowSuggestions() {
        CharSequence text = mTextView.getText();
        if (!(text instanceof Spannable)) return false;

        final Spannable spannable = (Spannable) text;
        final int selectionStart = mTextView.getSelectionStart();
        final int selectionEnd = mTextView.getSelectionEnd();
        final SuggestionSpan[] suggestionSpans = spannable.getSpans(selectionStart, selectionEnd,
                SuggestionSpan.class);
        if (suggestionSpans.length == 0) {
            return false;
        }
        if (selectionStart == selectionEnd) {
            // Spans overlap the cursor.
            for (int i = 0; i < suggestionSpans.length; i++) {
                if (suggestionSpans[i].getSuggestions().length > 0) {
                    return true;
                }
            }
            return false;
        }
        int minSpanStart = mTextView.getText().length();
        int maxSpanEnd = 0;
        int unionOfSpansCoveringSelectionStartStart = mTextView.getText().length();
        int unionOfSpansCoveringSelectionStartEnd = 0;
        boolean hasValidSuggestions = false;
        for (int i = 0; i < suggestionSpans.length; i++) {
            final int spanStart = spannable.getSpanStart(suggestionSpans[i]);
            final int spanEnd = spannable.getSpanEnd(suggestionSpans[i]);
            minSpanStart = Math.min(minSpanStart, spanStart);
            maxSpanEnd = Math.max(maxSpanEnd, spanEnd);
            if (selectionStart < spanStart || selectionStart > spanEnd) {
                // The span doesn't cover the current selection start point.
                continue;
            }
            hasValidSuggestions =
                    hasValidSuggestions || suggestionSpans[i].getSuggestions().length > 0;
            unionOfSpansCoveringSelectionStartStart =
                    Math.min(unionOfSpansCoveringSelectionStartStart, spanStart);
            unionOfSpansCoveringSelectionStartEnd =
                    Math.max(unionOfSpansCoveringSelectionStartEnd, spanEnd);
        }
        if (!hasValidSuggestions) {
            return false;
        }
        if (unionOfSpansCoveringSelectionStartStart >= unionOfSpansCoveringSelectionStartEnd) {
            // No spans cover the selection start point.
            return false;
        }
        if (minSpanStart < unionOfSpansCoveringSelectionStartStart
                || maxSpanEnd > unionOfSpansCoveringSelectionStartEnd) {
            // There is a span that is not covered by the union. In this case, we soouldn't offer
            // to show suggestions as it's confusing.
            return false;
        }
        return true;
    }

    /**
     * @return <code>true</code> if the cursor is inside an {@link SuggestionSpan} with
     * {@link SuggestionSpan#FLAG_EASY_CORRECT} set.
     */
    private boolean isCursorInsideEasyCorrectionSpan() {
        Spannable spannable = (Spannable) mTextView.getText();
        SuggestionSpan[] suggestionSpans = spannable.getSpans(mTextView.getSelectionStart(),
                mTextView.getSelectionEnd(), SuggestionSpan.class);
        for (int i = 0; i < suggestionSpans.length; i++) {
            if ((suggestionSpans[i].getFlags() & SuggestionSpan.FLAG_EASY_CORRECT) != 0) {
                return true;
            }
        }
        return false;
    }

    void onTouchUpEvent(MotionEvent event) {
        boolean selectAllGotFocus = mSelectAllOnFocus && mTextView.didTouchFocusSelect();
        hideCursorAndSpanControllers();
        stopTextActionMode();
        CharSequence text = mTextView.getText();
        if (!selectAllGotFocus && text.length() > 0) {
            // Move cursor
            final int offset = mTextView.getOffsetForPosition(event.getX(), event.getY());
            Selection.setSelection((Spannable) text, offset);
            if (mSpellChecker != null) {
                // When the cursor moves, the word that was typed may need spell check
                mSpellChecker.onSelectionChanged();
            }

            if (!extractedTextModeWillBeStarted()) {
                if (isCursorInsideEasyCorrectionSpan()) {
                    // Cancel the single tap delayed runnable.
                    if (mInsertionActionModeRunnable != null) {
                        mTextView.removeCallbacks(mInsertionActionModeRunnable);
                    }

                    mShowSuggestionRunnable = new Runnable() {
                        public void run() {
                            replace();
                        }
                    };
                    // removeCallbacks is performed on every touch
                    mTextView.postDelayed(mShowSuggestionRunnable,
                            ViewConfiguration.getDoubleTapTimeout());
                } else if (hasInsertionController()) {
                    getInsertionController().show();
                }
            }
        }
    }

    protected void stopTextActionMode() {
        if (mTextActionMode != null) {
            // This will hide the mSelectionModifierCursorController
            mTextActionMode.finish();
        }
    }

    private void stopTextActionModeWithPreservingSelection() {
        if (mTextActionMode != null) {
            mRestartActionModeOnNextRefresh = true;
        }
        mPreserveSelection = true;
        stopTextActionMode();
        mPreserveSelection = false;
    }

    /**
     * @return True if this view supports insertion handles.
     */
    boolean hasInsertionController() {
        return mInsertionControllerEnabled;
    }

    /**
     * @return True if this view supports selection handles.
     */
    boolean hasSelectionController() {
        return mSelectionControllerEnabled;
    }

    InsertionPointCursorController getInsertionController() {
        if (!mInsertionControllerEnabled) {
            return null;
        }

        if (mInsertionPointCursorController == null) {
            mInsertionPointCursorController = new InsertionPointCursorController();

            final ViewTreeObserver observer = mTextView.getViewTreeObserver();
            observer.addOnTouchModeChangeListener(mInsertionPointCursorController);
        }

        return mInsertionPointCursorController;
    }

    SelectionModifierCursorController getSelectionController() {
        if (!mSelectionControllerEnabled) {
            return null;
        }

        if (mSelectionModifierCursorController == null) {
            mSelectionModifierCursorController = new SelectionModifierCursorController();

            final ViewTreeObserver observer = mTextView.getViewTreeObserver();
            observer.addOnTouchModeChangeListener(mSelectionModifierCursorController);
        }

        return mSelectionModifierCursorController;
    }

    /**
     * @hide
     */
    @VisibleForTesting
    public Drawable[] getCursorDrawable() {
        return mCursorDrawable;
    }

    private void updateCursorPosition(int cursorIndex, int top, int bottom, float horizontal) {
        if (mCursorDrawable[cursorIndex] == null)
            mCursorDrawable[cursorIndex] = mTextView.getContext().getDrawable(
                    mTextView.mCursorDrawableRes);
        final Drawable drawable = mCursorDrawable[cursorIndex];
        final int left = clampHorizontalPosition(drawable, horizontal);
        final int width = drawable.getIntrinsicWidth();
        drawable.setBounds(left, top - mTempRect.top, left + width,
                bottom + mTempRect.bottom);
    }

    /**
     * Return clamped position for the drawable. If the drawable is within the boundaries of the
     * view, then it is offset with the left padding of the cursor drawable. If the drawable is at
     * the beginning or the end of the text then its drawable edge is aligned with left or right of
     * the view boundary. If the drawable is null, horizontal parameter is aligned to left or right
     * of the view.
     *
     * @param drawable Drawable. Can be null.
     * @param horizontal Horizontal position for the drawable.
     * @return The clamped horizontal position for the drawable.
     */
    private int clampHorizontalPosition(@Nullable final Drawable drawable, float horizontal) {
        horizontal = Math.max(0.5f, horizontal - 0.5f);
        if (mTempRect == null) mTempRect = new Rect();

        int drawableWidth = 0;
        if (drawable != null) {
            drawable.getPadding(mTempRect);
            drawableWidth = drawable.getIntrinsicWidth();
        } else {
            mTempRect.setEmpty();
        }

        int scrollX = mTextView.getScrollX();
        float horizontalDiff = horizontal - scrollX;
        int viewClippedWidth = mTextView.getWidth() - mTextView.getCompoundPaddingLeft()
                - mTextView.getCompoundPaddingRight();

        final int left;
        if (horizontalDiff >= (viewClippedWidth - 1f)) {
            // at the rightmost position
            left = viewClippedWidth + scrollX - (drawableWidth - mTempRect.right);
        } else if (Math.abs(horizontalDiff) <= 1f ||
                (TextUtils.isEmpty(mTextView.getText())
                        && (TextView.VERY_WIDE - scrollX) <= (viewClippedWidth + 1f)
                        && horizontal <= 1f)) {
            // at the leftmost position
            left = scrollX - mTempRect.left;
        } else {
            left = (int) horizontal - mTempRect.left;
        }
        return left;
    }

    /**
     * Called by the framework in response to a text auto-correction (such as fixing a typo using a
     * a dictionary) from the current input method, provided by it calling
     * {@link InputConnection#commitCorrection} InputConnection.commitCorrection()}. The default
     * implementation flashes the background of the corrected word to provide feedback to the user.
     *
     * @param info The auto correct info about the text that was corrected.
     */
    public void onCommitCorrection(CorrectionInfo info) {
        if (mCorrectionHighlighter == null) {
            mCorrectionHighlighter = new CorrectionHighlighter();
        } else {
            mCorrectionHighlighter.invalidate(false);
        }

        mCorrectionHighlighter.highlight(info);
    }

    void onScrollChanged() {
        if (mPositionListener != null) {
            mPositionListener.onScrollChanged();
        }
        if (mTextActionMode != null) {
            mTextActionMode.invalidateContentRect();
        }
    }

    /**
     * @return True when the TextView isFocused and has a valid zero-length selection (cursor).
     */
    private boolean shouldBlink() {
        if (!isCursorVisible() || !mTextView.isFocused()) return false;

        final int start = mTextView.getSelectionStart();
        if (start < 0) return false;

        final int end = mTextView.getSelectionEnd();
        if (end < 0) return false;

        return start == end;
    }

    void makeBlink() {
        if (shouldBlink()) {
            mShowCursor = SystemClock.uptimeMillis();
            if (mBlink == null) mBlink = new Blink();
            mTextView.removeCallbacks(mBlink);
            mTextView.postDelayed(mBlink, BLINK);
        } else {
            if (mBlink != null) mTextView.removeCallbacks(mBlink);
        }
    }

    private class Blink implements Runnable {
        private boolean mCancelled;

        public void run() {
            if (mCancelled) {
                return;
            }

            mTextView.removeCallbacks(this);

            if (shouldBlink()) {
                if (mTextView.getLayout() != null) {
                    mTextView.invalidateCursorPath();
                }

                mTextView.postDelayed(this, BLINK);
            }
        }

        void cancel() {
            if (!mCancelled) {
                mTextView.removeCallbacks(this);
                mCancelled = true;
            }
        }

        void uncancel() {
            mCancelled = false;
        }
    }

    private DragShadowBuilder getTextThumbnailBuilder(int start, int end) {
        TextView shadowView = (TextView) View.inflate(mTextView.getContext(),
                com.android.internal.R.layout.text_drag_thumbnail, null);

        if (shadowView == null) {
            throw new IllegalArgumentException("Unable to inflate text drag thumbnail");
        }

        if (end - start > DRAG_SHADOW_MAX_TEXT_LENGTH) {
            final long range = getCharClusterRange(start + DRAG_SHADOW_MAX_TEXT_LENGTH);
            end = TextUtils.unpackRangeEndFromLong(range);
        }
        final CharSequence text = mTextView.getTransformedText(start, end);
        shadowView.setText(text);
        shadowView.setTextColor(mTextView.getTextColors());

        shadowView.setTextAppearance(R.styleable.Theme_textAppearanceLarge);
        shadowView.setGravity(Gravity.CENTER);

        shadowView.setLayoutParams(new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));

        final int size = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        shadowView.measure(size, size);

        shadowView.layout(0, 0, shadowView.getMeasuredWidth(), shadowView.getMeasuredHeight());
        shadowView.invalidate();
        return new DragShadowBuilder(shadowView);
    }

    private static class DragLocalState {
        public TextView sourceTextView;
        public int start, end;

        public DragLocalState(TextView sourceTextView, int start, int end) {
            this.sourceTextView = sourceTextView;
            this.start = start;
            this.end = end;
        }
    }

    void onDrop(DragEvent event) {
        StringBuilder content = new StringBuilder("");

        final DragAndDropPermissions permissions = DragAndDropPermissions.obtain(event);
        if (permissions != null) {
            permissions.takeTransient();
        }

        try {
            ClipData clipData = event.getClipData();
            final int itemCount = clipData.getItemCount();
            for (int i=0; i < itemCount; i++) {
                Item item = clipData.getItemAt(i);
                content.append(item.coerceToStyledText(mTextView.getContext()));
            }
        }
        finally {
            if (permissions != null) {
                permissions.release();
            }
        }

        final int offset = mTextView.getOffsetForPosition(event.getX(), event.getY());

        Object localState = event.getLocalState();
        DragLocalState dragLocalState = null;
        if (localState instanceof DragLocalState) {
            dragLocalState = (DragLocalState) localState;
        }
        boolean dragDropIntoItself = dragLocalState != null &&
                dragLocalState.sourceTextView == mTextView;

        if (dragDropIntoItself) {
            if (offset >= dragLocalState.start && offset < dragLocalState.end) {
                // A drop inside the original selection discards the drop.
                return;
            }
        }

        final int originalLength = mTextView.getText().length();
        int min = offset;
        int max = offset;

        Selection.setSelection((Spannable) mTextView.getText(), max);
        mTextView.replaceText_internal(min, max, content);

        if (dragDropIntoItself) {
            int dragSourceStart = dragLocalState.start;
            int dragSourceEnd = dragLocalState.end;
            if (max <= dragSourceStart) {
                // Inserting text before selection has shifted positions
                final int shift = mTextView.getText().length() - originalLength;
                dragSourceStart += shift;
                dragSourceEnd += shift;
            }

            mUndoInputFilter.setForceMerge(true);
            try {
                // Delete original selection
                mTextView.deleteText_internal(dragSourceStart, dragSourceEnd);

                // Make sure we do not leave two adjacent spaces.
                final int prevCharIdx = Math.max(0,  dragSourceStart - 1);
                final int nextCharIdx = Math.min(mTextView.getText().length(), dragSourceStart + 1);
                if (nextCharIdx > prevCharIdx + 1) {
                    CharSequence t = mTextView.getTransformedText(prevCharIdx, nextCharIdx);
                    if (Character.isSpaceChar(t.charAt(0)) && Character.isSpaceChar(t.charAt(1))) {
                        mTextView.deleteText_internal(prevCharIdx, prevCharIdx + 1);
                    }
                }
            } finally {
                mUndoInputFilter.setForceMerge(false);
            }
        }
    }

    public void addSpanWatchers(Spannable text) {
        final int textLength = text.length();

        if (mKeyListener != null) {
            text.setSpan(mKeyListener, 0, textLength, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
        }

        if (mSpanController == null) {
            mSpanController = new SpanController();
        }
        text.setSpan(mSpanController, 0, textLength, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
    }

    void setContextMenuAnchor(float x, float y) {
        mContextMenuAnchorX = x;
        mContextMenuAnchorY = y;
    }

    void onCreateContextMenu(ContextMenu menu) {
        if (mIsBeingLongClicked || Float.isNaN(mContextMenuAnchorX)
                || Float.isNaN(mContextMenuAnchorY)) {
            return;
        }
        final int offset = mTextView.getOffsetForPosition(mContextMenuAnchorX, mContextMenuAnchorY);
        if (offset == -1) {
            return;
        }
        stopTextActionModeWithPreservingSelection();
        final boolean isOnSelection = mTextView.hasSelection()
                && offset >= mTextView.getSelectionStart() && offset <= mTextView.getSelectionEnd();
        if (!isOnSelection) {
            // Right clicked position is not on the selection. Remove the selection and move the
            // cursor to the right clicked position.
            Selection.setSelection((Spannable) mTextView.getText(), offset);
            stopTextActionMode();
        }

        if (shouldOfferToShowSuggestions()) {
            final SuggestionInfo[] suggestionInfoArray =
                    new SuggestionInfo[SuggestionSpan.SUGGESTIONS_MAX_SIZE];
            for (int i = 0; i < suggestionInfoArray.length; i++) {
                suggestionInfoArray[i] = new SuggestionInfo();
            }
            final SubMenu subMenu = menu.addSubMenu(Menu.NONE, Menu.NONE, MENU_ITEM_ORDER_REPLACE,
                    com.android.internal.R.string.replace);
            final int numItems = mSuggestionHelper.getSuggestionInfo(suggestionInfoArray, null);
            for (int i = 0; i < numItems; i++) {
                final SuggestionInfo info = suggestionInfoArray[i];
                subMenu.add(Menu.NONE, Menu.NONE, i, info.mText)
                        .setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
                            @Override
                            public boolean onMenuItemClick(MenuItem item) {
                                replaceWithSuggestion(info);
                                return true;
                            }
                        });
            }
        }

        menu.add(Menu.NONE, TextView.ID_UNDO, MENU_ITEM_ORDER_UNDO,
                com.android.internal.R.string.undo)
                .setAlphabeticShortcut('z')
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener)
                .setEnabled(mTextView.canUndo());
        menu.add(Menu.NONE, TextView.ID_REDO, MENU_ITEM_ORDER_REDO,
                com.android.internal.R.string.redo)
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener)
                .setEnabled(mTextView.canRedo());

        menu.add(Menu.NONE, TextView.ID_CUT, MENU_ITEM_ORDER_CUT,
                com.android.internal.R.string.cut)
                .setAlphabeticShortcut('x')
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener)
                .setEnabled(mTextView.canCut());
        menu.add(Menu.NONE, TextView.ID_COPY, MENU_ITEM_ORDER_COPY,
                com.android.internal.R.string.copy)
                .setAlphabeticShortcut('c')
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener)
                .setEnabled(mTextView.canCopy());
        menu.add(Menu.NONE, TextView.ID_PASTE, MENU_ITEM_ORDER_PASTE,
                com.android.internal.R.string.paste)
                .setAlphabeticShortcut('v')
                .setEnabled(mTextView.canPaste())
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener);
        menu.add(Menu.NONE, TextView.ID_PASTE, MENU_ITEM_ORDER_PASTE_AS_PLAIN_TEXT,
                com.android.internal.R.string.paste_as_plain_text)
                .setEnabled(mTextView.canPaste())
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener);
        menu.add(Menu.NONE, TextView.ID_SHARE, MENU_ITEM_ORDER_SHARE,
                com.android.internal.R.string.share)
                .setEnabled(mTextView.canShare())
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener);
        menu.add(Menu.NONE, TextView.ID_SELECT_ALL, MENU_ITEM_ORDER_SELECT_ALL,
                com.android.internal.R.string.selectAll)
                .setAlphabeticShortcut('a')
                .setEnabled(mTextView.canSelectAllText())
                .setOnMenuItemClickListener(mOnContextMenuItemClickListener);

        mPreserveSelection = true;
    }

    @Nullable
    private SuggestionSpan findEquivalentSuggestionSpan(
            @NonNull SuggestionSpanInfo suggestionSpanInfo) {
        final Editable editable = (Editable) mTextView.getText();
        if (editable.getSpanStart(suggestionSpanInfo.mSuggestionSpan) >= 0) {
            // Exactly same span is found.
            return suggestionSpanInfo.mSuggestionSpan;
        }
        // Suggestion span couldn't be found. Try to find a suggestion span that has the same
        // contents.
        final SuggestionSpan[] suggestionSpans = editable.getSpans(suggestionSpanInfo.mSpanStart,
                suggestionSpanInfo.mSpanEnd, SuggestionSpan.class);
        for (final SuggestionSpan suggestionSpan : suggestionSpans) {
            final int start = editable.getSpanStart(suggestionSpan);
            if (start != suggestionSpanInfo.mSpanStart) {
                continue;
            }
            final int end = editable.getSpanEnd(suggestionSpan);
            if (end != suggestionSpanInfo.mSpanEnd) {
                continue;
            }
            if (suggestionSpan.equals(suggestionSpanInfo.mSuggestionSpan)) {
                return suggestionSpan;
            }
        }
        return null;
    }

    private void replaceWithSuggestion(@NonNull final SuggestionInfo suggestionInfo) {
        final SuggestionSpan targetSuggestionSpan = findEquivalentSuggestionSpan(
                suggestionInfo.mSuggestionSpanInfo);
        if (targetSuggestionSpan == null) {
            // Span has been removed
            return;
        }
        final Editable editable = (Editable) mTextView.getText();
        final int spanStart = editable.getSpanStart(targetSuggestionSpan);
        final int spanEnd = editable.getSpanEnd(targetSuggestionSpan);
        if (spanStart < 0 || spanEnd <= spanStart) {
            // Span has been removed
            return;
        }

        final String originalText = TextUtils.substring(editable, spanStart, spanEnd);
        // SuggestionSpans are removed by replace: save them before
        SuggestionSpan[] suggestionSpans = editable.getSpans(spanStart, spanEnd,
                SuggestionSpan.class);
        final int length = suggestionSpans.length;
        int[] suggestionSpansStarts = new int[length];
        int[] suggestionSpansEnds = new int[length];
        int[] suggestionSpansFlags = new int[length];
        for (int i = 0; i < length; i++) {
            final SuggestionSpan suggestionSpan = suggestionSpans[i];
            suggestionSpansStarts[i] = editable.getSpanStart(suggestionSpan);
            suggestionSpansEnds[i] = editable.getSpanEnd(suggestionSpan);
            suggestionSpansFlags[i] = editable.getSpanFlags(suggestionSpan);

            // Remove potential misspelled flags
            int suggestionSpanFlags = suggestionSpan.getFlags();
            if ((suggestionSpanFlags & SuggestionSpan.FLAG_MISSPELLED) != 0) {
                suggestionSpanFlags &= ~SuggestionSpan.FLAG_MISSPELLED;
                suggestionSpanFlags &= ~SuggestionSpan.FLAG_EASY_CORRECT;
                suggestionSpan.setFlags(suggestionSpanFlags);
            }
        }

        // Notify source IME of the suggestion pick. Do this before swapping texts.
        targetSuggestionSpan.notifySelection(
                mTextView.getContext(), originalText, suggestionInfo.mSuggestionIndex);

        // Swap text content between actual text and Suggestion span
        final int suggestionStart = suggestionInfo.mSuggestionStart;
        final int suggestionEnd = suggestionInfo.mSuggestionEnd;
        final String suggestion = suggestionInfo.mText.subSequence(
                suggestionStart, suggestionEnd).toString();
        mTextView.replaceText_internal(spanStart, spanEnd, suggestion);

        String[] suggestions = targetSuggestionSpan.getSuggestions();
        suggestions[suggestionInfo.mSuggestionIndex] = originalText;

        // Restore previous SuggestionSpans
        final int lengthDelta = suggestion.length() - (spanEnd - spanStart);
        for (int i = 0; i < length; i++) {
            // Only spans that include the modified region make sense after replacement
            // Spans partially included in the replaced region are removed, there is no
            // way to assign them a valid range after replacement
            if (suggestionSpansStarts[i] <= spanStart && suggestionSpansEnds[i] >= spanEnd) {
                mTextView.setSpan_internal(suggestionSpans[i], suggestionSpansStarts[i],
                        suggestionSpansEnds[i] + lengthDelta, suggestionSpansFlags[i]);
            }
        }
        // Move cursor at the end of the replaced word
        final int newCursorPosition = spanEnd + lengthDelta;
        mTextView.setCursorPosition_internal(newCursorPosition, newCursorPosition);
    }

    private final MenuItem.OnMenuItemClickListener mOnContextMenuItemClickListener =
            new MenuItem.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
            if (mProcessTextIntentActionsHandler.performMenuItemAction(item)) {
                return true;
            }
            return mTextView.onTextContextMenuItem(item.getItemId());
        }
    };

    /**
     * Controls the {@link EasyEditSpan} monitoring when it is added, and when the related
     * pop-up should be displayed.
     * Also monitors {@link Selection} to call back to the attached input method.
     */
    class SpanController implements SpanWatcher {

        private static final int DISPLAY_TIMEOUT_MS = 3000; // 3 secs

        private EasyEditPopupWindow mPopupWindow;

        private Runnable mHidePopup;

        // This function is pure but inner classes can't have static functions
        private boolean isNonIntermediateSelectionSpan(final Spannable text,
                final Object span) {
            return (Selection.SELECTION_START == span || Selection.SELECTION_END == span)
                    && (text.getSpanFlags(span) & Spanned.SPAN_INTERMEDIATE) == 0;
        }

        @Override
        public void onSpanAdded(Spannable text, Object span, int start, int end) {
            if (isNonIntermediateSelectionSpan(text, span)) {
                sendUpdateSelection();
            } else if (span instanceof EasyEditSpan) {
                if (mPopupWindow == null) {
                    mPopupWindow = new EasyEditPopupWindow();
                    mHidePopup = new Runnable() {
                        @Override
                        public void run() {
                            hide();
                        }
                    };
                }

                // Make sure there is only at most one EasyEditSpan in the text
                if (mPopupWindow.mEasyEditSpan != null) {
                    mPopupWindow.mEasyEditSpan.setDeleteEnabled(false);
                }

                mPopupWindow.setEasyEditSpan((EasyEditSpan) span);
                mPopupWindow.setOnDeleteListener(new EasyEditDeleteListener() {
                    @Override
                    public void onDeleteClick(EasyEditSpan span) {
                        Editable editable = (Editable) mTextView.getText();
                        int start = editable.getSpanStart(span);
                        int end = editable.getSpanEnd(span);
                        if (start >= 0 && end >= 0) {
                            sendEasySpanNotification(EasyEditSpan.TEXT_DELETED, span);
                            mTextView.deleteText_internal(start, end);
                        }
                        editable.removeSpan(span);
                    }
                });

                if (mTextView.getWindowVisibility() != View.VISIBLE) {
                    // The window is not visible yet, ignore the text change.
                    return;
                }

                if (mTextView.getLayout() == null) {
                    // The view has not been laid out yet, ignore the text change
                    return;
                }

                if (extractedTextModeWillBeStarted()) {
                    // The input is in extract mode. Do not handle the easy edit in
                    // the original TextView, as the ExtractEditText will do
                    return;
                }

                mPopupWindow.show();
                mTextView.removeCallbacks(mHidePopup);
                mTextView.postDelayed(mHidePopup, DISPLAY_TIMEOUT_MS);
            }
        }

        @Override
        public void onSpanRemoved(Spannable text, Object span, int start, int end) {
            if (isNonIntermediateSelectionSpan(text, span)) {
                sendUpdateSelection();
            } else if (mPopupWindow != null && span == mPopupWindow.mEasyEditSpan) {
                hide();
            }
        }

        @Override
        public void onSpanChanged(Spannable text, Object span, int previousStart, int previousEnd,
                int newStart, int newEnd) {
            if (isNonIntermediateSelectionSpan(text, span)) {
                sendUpdateSelection();
            } else if (mPopupWindow != null && span instanceof EasyEditSpan) {
                EasyEditSpan easyEditSpan = (EasyEditSpan) span;
                sendEasySpanNotification(EasyEditSpan.TEXT_MODIFIED, easyEditSpan);
                text.removeSpan(easyEditSpan);
            }
        }

        public void hide() {
            if (mPopupWindow != null) {
                mPopupWindow.hide();
                mTextView.removeCallbacks(mHidePopup);
            }
        }

        private void sendEasySpanNotification(int textChangedType, EasyEditSpan span) {
            try {
                PendingIntent pendingIntent = span.getPendingIntent();
                if (pendingIntent != null) {
                    Intent intent = new Intent();
                    intent.putExtra(EasyEditSpan.EXTRA_TEXT_CHANGED_TYPE, textChangedType);
                    pendingIntent.send(mTextView.getContext(), 0, intent);
                }
            } catch (CanceledException e) {
                // This should not happen, as we should try to send the intent only once.
                Log.w(TAG, "PendingIntent for notification cannot be sent", e);
            }
        }
    }

    /**
     * Listens for the delete event triggered by {@link EasyEditPopupWindow}.
     */
    private interface EasyEditDeleteListener {

        /**
         * Clicks the delete pop-up.
         */
        void onDeleteClick(EasyEditSpan span);
    }

    /**
     * Displays the actions associated to an {@link EasyEditSpan}. The pop-up is controlled
     * by {@link SpanController}.
     */
    private class EasyEditPopupWindow extends PinnedPopupWindow
            implements OnClickListener {
        private static final int POPUP_TEXT_LAYOUT =
                com.android.internal.R.layout.text_edit_action_popup_text;
        private TextView mDeleteTextView;
        private EasyEditSpan mEasyEditSpan;
        private EasyEditDeleteListener mOnDeleteListener;

        @Override
        protected void createPopupWindow() {
            mPopupWindow = new PopupWindow(mTextView.getContext(), null,
                    com.android.internal.R.attr.textSelectHandleWindowStyle);
            mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
            mPopupWindow.setClippingEnabled(true);
        }

        @Override
        protected void initContentView() {
            LinearLayout linearLayout = new LinearLayout(mTextView.getContext());
            linearLayout.setOrientation(LinearLayout.HORIZONTAL);
            mContentView = linearLayout;
            mContentView.setBackgroundResource(
                    com.android.internal.R.drawable.text_edit_side_paste_window);

            LayoutInflater inflater = (LayoutInflater)mTextView.getContext().
                    getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            LayoutParams wrapContent = new LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

            mDeleteTextView = (TextView) inflater.inflate(POPUP_TEXT_LAYOUT, null);
            mDeleteTextView.setLayoutParams(wrapContent);
            mDeleteTextView.setText(com.android.internal.R.string.delete);
            mDeleteTextView.setOnClickListener(this);
            mContentView.addView(mDeleteTextView);
        }

        public void setEasyEditSpan(EasyEditSpan easyEditSpan) {
            mEasyEditSpan = easyEditSpan;
        }

        private void setOnDeleteListener(EasyEditDeleteListener listener) {
            mOnDeleteListener = listener;
        }

        @Override
        public void onClick(View view) {
            if (view == mDeleteTextView
                    && mEasyEditSpan != null && mEasyEditSpan.isDeleteEnabled()
                    && mOnDeleteListener != null) {
                mOnDeleteListener.onDeleteClick(mEasyEditSpan);
            }
        }

        @Override
        public void hide() {
            if (mEasyEditSpan != null) {
                mEasyEditSpan.setDeleteEnabled(false);
            }
            mOnDeleteListener = null;
            super.hide();
        }

        @Override
        protected int getTextOffset() {
            // Place the pop-up at the end of the span
            Editable editable = (Editable) mTextView.getText();
            return editable.getSpanEnd(mEasyEditSpan);
        }

        @Override
        protected int getVerticalLocalPosition(int line) {
            return mTextView.getLayout().getLineBottom(line);
        }

        @Override
        protected int clipVertically(int positionY) {
            // As we display the pop-up below the span, no vertical clipping is required.
            return positionY;
        }
    }

    private class PositionListener implements ViewTreeObserver.OnPreDrawListener {
        // 3 handles
        // 3 ActionPopup [replace, suggestion, easyedit] (suggestionsPopup first hides the others)
        // 1 CursorAnchorInfoNotifier
        private final int MAXIMUM_NUMBER_OF_LISTENERS = 7;
        private TextViewPositionListener[] mPositionListeners =
                new TextViewPositionListener[MAXIMUM_NUMBER_OF_LISTENERS];
        private boolean mCanMove[] = new boolean[MAXIMUM_NUMBER_OF_LISTENERS];
        private boolean mPositionHasChanged = true;
        // Absolute position of the TextView with respect to its parent window
        private int mPositionX, mPositionY;
        private int mPositionXOnScreen, mPositionYOnScreen;
        private int mNumberOfListeners;
        private boolean mScrollHasChanged;
        final int[] mTempCoords = new int[2];

        public void addSubscriber(TextViewPositionListener positionListener, boolean canMove) {
            if (mNumberOfListeners == 0) {
                updatePosition();
                ViewTreeObserver vto = mTextView.getViewTreeObserver();
                vto.addOnPreDrawListener(this);
            }

            int emptySlotIndex = -1;
            for (int i = 0; i < MAXIMUM_NUMBER_OF_LISTENERS; i++) {
                TextViewPositionListener listener = mPositionListeners[i];
                if (listener == positionListener) {
                    return;
                } else if (emptySlotIndex < 0 && listener == null) {
                    emptySlotIndex = i;
                }
            }

            mPositionListeners[emptySlotIndex] = positionListener;
            mCanMove[emptySlotIndex] = canMove;
            mNumberOfListeners++;
        }

        public void removeSubscriber(TextViewPositionListener positionListener) {
            for (int i = 0; i < MAXIMUM_NUMBER_OF_LISTENERS; i++) {
                if (mPositionListeners[i] == positionListener) {
                    mPositionListeners[i] = null;
                    mNumberOfListeners--;
                    break;
                }
            }

            if (mNumberOfListeners == 0) {
                ViewTreeObserver vto = mTextView.getViewTreeObserver();
                vto.removeOnPreDrawListener(this);
            }
        }

        public int getPositionX() {
            return mPositionX;
        }

        public int getPositionY() {
            return mPositionY;
        }

        public int getPositionXOnScreen() {
            return mPositionXOnScreen;
        }

        public int getPositionYOnScreen() {
            return mPositionYOnScreen;
        }

        @Override
        public boolean onPreDraw() {
            updatePosition();

            for (int i = 0; i < MAXIMUM_NUMBER_OF_LISTENERS; i++) {
                if (mPositionHasChanged || mScrollHasChanged || mCanMove[i]) {
                    TextViewPositionListener positionListener = mPositionListeners[i];
                    if (positionListener != null) {
                        positionListener.updatePosition(mPositionX, mPositionY,
                                mPositionHasChanged, mScrollHasChanged);
                    }
                }
            }

            mScrollHasChanged = false;
            return true;
        }

        private void updatePosition() {
            mTextView.getLocationInWindow(mTempCoords);

            mPositionHasChanged = mTempCoords[0] != mPositionX || mTempCoords[1] != mPositionY;

            mPositionX = mTempCoords[0];
            mPositionY = mTempCoords[1];

            mTextView.getLocationOnScreen(mTempCoords);

            mPositionXOnScreen = mTempCoords[0];
            mPositionYOnScreen = mTempCoords[1];
        }

        public void onScrollChanged() {
            mScrollHasChanged = true;
        }
    }

    private abstract class PinnedPopupWindow implements TextViewPositionListener {
        protected PopupWindow mPopupWindow;
        protected ViewGroup mContentView;
        int mPositionX, mPositionY;
        int mClippingLimitLeft, mClippingLimitRight;

        protected abstract void createPopupWindow();
        protected abstract void initContentView();
        protected abstract int getTextOffset();
        protected abstract int getVerticalLocalPosition(int line);
        protected abstract int clipVertically(int positionY);
        protected void setUp() {
        }

        public PinnedPopupWindow() {
            // Due to calling subclass methods in base constructor, subclass constructor is not
            // called before subclass methods, e.g. createPopupWindow or initContentView. To give
            // a chance to initialize subclasses, call setUp() method here.
            // TODO: It is good to extract non trivial initialization code from constructor.
            setUp();

            createPopupWindow();

            mPopupWindow.setWindowLayoutType(
                    WindowManager.LayoutParams.TYPE_APPLICATION_ABOVE_SUB_PANEL);
            mPopupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
            mPopupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);

            initContentView();

            LayoutParams wrapContent = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
            mContentView.setLayoutParams(wrapContent);

            mPopupWindow.setContentView(mContentView);
        }

        public void show() {
            getPositionListener().addSubscriber(this, false /* offset is fixed */);

            computeLocalPosition();

            final PositionListener positionListener = getPositionListener();
            updatePosition(positionListener.getPositionX(), positionListener.getPositionY());
        }

        protected void measureContent() {
            final DisplayMetrics displayMetrics = mTextView.getResources().getDisplayMetrics();
            mContentView.measure(
                    View.MeasureSpec.makeMeasureSpec(displayMetrics.widthPixels,
                            View.MeasureSpec.AT_MOST),
                    View.MeasureSpec.makeMeasureSpec(displayMetrics.heightPixels,
                            View.MeasureSpec.AT_MOST));
        }

        /* The popup window will be horizontally centered on the getTextOffset() and vertically
         * positioned according to viewportToContentHorizontalOffset.
         *
         * This method assumes that mContentView has properly been measured from its content. */
        private void computeLocalPosition() {
            measureContent();
            final int width = mContentView.getMeasuredWidth();
            final int offset = getTextOffset();
            mPositionX = (int) (mTextView.getLayout().getPrimaryHorizontal(offset) - width / 2.0f);
            mPositionX += mTextView.viewportToContentHorizontalOffset();

            final int line = mTextView.getLayout().getLineForOffset(offset);
            mPositionY = getVerticalLocalPosition(line);
            mPositionY += mTextView.viewportToContentVerticalOffset();
        }

        private void updatePosition(int parentPositionX, int parentPositionY) {
            int positionX = parentPositionX + mPositionX;
            int positionY = parentPositionY + mPositionY;

            positionY = clipVertically(positionY);

            // Horizontal clipping
            final DisplayMetrics displayMetrics = mTextView.getResources().getDisplayMetrics();
            final int width = mContentView.getMeasuredWidth();
            positionX = Math.min(
                    displayMetrics.widthPixels - width + mClippingLimitRight, positionX);
            positionX = Math.max(-mClippingLimitLeft, positionX);

            if (isShowing()) {
                mPopupWindow.update(positionX, positionY, -1, -1);
            } else {
                mPopupWindow.showAtLocation(mTextView, Gravity.NO_GRAVITY,
                        positionX, positionY);
            }
        }

        public void hide() {
            if (!isShowing()) {
                return;
            }
            mPopupWindow.dismiss();
            getPositionListener().removeSubscriber(this);
        }

        @Override
        public void updatePosition(int parentPositionX, int parentPositionY,
                boolean parentPositionChanged, boolean parentScrolled) {
            // Either parentPositionChanged or parentScrolled is true, check if still visible
            if (isShowing() && isOffsetVisible(getTextOffset())) {
                if (parentScrolled) computeLocalPosition();
                updatePosition(parentPositionX, parentPositionY);
            } else {
                hide();
            }
        }

        public boolean isShowing() {
            return mPopupWindow.isShowing();
        }
    }

    private static final class SuggestionInfo {
        // Range of actual suggestion within mText
        int mSuggestionStart, mSuggestionEnd;

        // The SuggestionSpan that this TextView represents
        final SuggestionSpanInfo mSuggestionSpanInfo = new SuggestionSpanInfo();

        // The index of this suggestion inside suggestionSpan
        int mSuggestionIndex;

        final SpannableStringBuilder mText = new SpannableStringBuilder();

        void clear() {
            mSuggestionSpanInfo.clear();
            mText.clear();
        }

        // Utility method to set attributes about a SuggestionSpan.
        void setSpanInfo(SuggestionSpan span, int spanStart, int spanEnd) {
            mSuggestionSpanInfo.mSuggestionSpan = span;
            mSuggestionSpanInfo.mSpanStart = spanStart;
            mSuggestionSpanInfo.mSpanEnd = spanEnd;
        }
    }

    private static final class SuggestionSpanInfo {
        // The SuggestionSpan;
        @Nullable
        SuggestionSpan mSuggestionSpan;

        // The SuggestionSpan start position
        int mSpanStart;

        // The SuggestionSpan end position
        int mSpanEnd;

        void clear() {
            mSuggestionSpan = null;
        }
    }

    private class SuggestionHelper {
        private final Comparator<SuggestionSpan> mSuggestionSpanComparator =
                new SuggestionSpanComparator();
        private final HashMap<SuggestionSpan, Integer> mSpansLengths =
                new HashMap<SuggestionSpan, Integer>();

        private class SuggestionSpanComparator implements Comparator<SuggestionSpan> {
            public int compare(SuggestionSpan span1, SuggestionSpan span2) {
                final int flag1 = span1.getFlags();
                final int flag2 = span2.getFlags();
                if (flag1 != flag2) {
                    // The order here should match what is used in updateDrawState
                    final boolean easy1 = (flag1 & SuggestionSpan.FLAG_EASY_CORRECT) != 0;
                    final boolean easy2 = (flag2 & SuggestionSpan.FLAG_EASY_CORRECT) != 0;
                    final boolean misspelled1 = (flag1 & SuggestionSpan.FLAG_MISSPELLED) != 0;
                    final boolean misspelled2 = (flag2 & SuggestionSpan.FLAG_MISSPELLED) != 0;
                    if (easy1 && !misspelled1) return -1;
                    if (easy2 && !misspelled2) return 1;
                    if (misspelled1) return -1;
                    if (misspelled2) return 1;
                }

                return mSpansLengths.get(span1).intValue() - mSpansLengths.get(span2).intValue();
            }
        }

        /**
         * Returns the suggestion spans that cover the current cursor position. The suggestion
         * spans are sorted according to the length of text that they are attached to.
         */
        private SuggestionSpan[] getSortedSuggestionSpans() {
            int pos = mTextView.getSelectionStart();
            Spannable spannable = (Spannable) mTextView.getText();
            SuggestionSpan[] suggestionSpans = spannable.getSpans(pos, pos, SuggestionSpan.class);

            mSpansLengths.clear();
            for (SuggestionSpan suggestionSpan : suggestionSpans) {
                int start = spannable.getSpanStart(suggestionSpan);
                int end = spannable.getSpanEnd(suggestionSpan);
                mSpansLengths.put(suggestionSpan, Integer.valueOf(end - start));
            }

            // The suggestions are sorted according to their types (easy correction first, then
            // misspelled) and to the length of the text that they cover (shorter first).
            Arrays.sort(suggestionSpans, mSuggestionSpanComparator);
            mSpansLengths.clear();

            return suggestionSpans;
        }

        /**
         * Gets the SuggestionInfo list that contains suggestion information at the current cursor
         * position.
         *
         * @param suggestionInfos SuggestionInfo array the results will be set.
         * @param misspelledSpanInfo a struct the misspelled SuggestionSpan info will be set.
         * @return the number of suggestions actually fetched.
         */
        public int getSuggestionInfo(SuggestionInfo[] suggestionInfos,
                @Nullable SuggestionSpanInfo misspelledSpanInfo) {
            final Spannable spannable = (Spannable) mTextView.getText();
            final SuggestionSpan[] suggestionSpans = getSortedSuggestionSpans();
            final int nbSpans = suggestionSpans.length;
            if (nbSpans == 0) return 0;

            int numberOfSuggestions = 0;
            for (final SuggestionSpan suggestionSpan : suggestionSpans) {
                final int spanStart = spannable.getSpanStart(suggestionSpan);
                final int spanEnd = spannable.getSpanEnd(suggestionSpan);

                if (misspelledSpanInfo != null
                        && (suggestionSpan.getFlags() & SuggestionSpan.FLAG_MISSPELLED) != 0) {
                    misspelledSpanInfo.mSuggestionSpan = suggestionSpan;
                    misspelledSpanInfo.mSpanStart = spanStart;
                    misspelledSpanInfo.mSpanEnd = spanEnd;
                }

                final String[] suggestions = suggestionSpan.getSuggestions();
                final int nbSuggestions = suggestions.length;
                suggestionLoop:
                for (int suggestionIndex = 0; suggestionIndex < nbSuggestions; suggestionIndex++) {
                    final String suggestion = suggestions[suggestionIndex];
                    for (int i = 0; i < numberOfSuggestions; i++) {
                        final SuggestionInfo otherSuggestionInfo = suggestionInfos[i];
                        if (otherSuggestionInfo.mText.toString().equals(suggestion)) {
                            final int otherSpanStart =
                                    otherSuggestionInfo.mSuggestionSpanInfo.mSpanStart;
                            final int otherSpanEnd =
                                    otherSuggestionInfo.mSuggestionSpanInfo.mSpanEnd;
                            if (spanStart == otherSpanStart && spanEnd == otherSpanEnd) {
                                continue suggestionLoop;
                            }
                        }
                    }

                    SuggestionInfo suggestionInfo = suggestionInfos[numberOfSuggestions];
                    suggestionInfo.setSpanInfo(suggestionSpan, spanStart, spanEnd);
                    suggestionInfo.mSuggestionIndex = suggestionIndex;
                    suggestionInfo.mSuggestionStart = 0;
                    suggestionInfo.mSuggestionEnd = suggestion.length();
                    suggestionInfo.mText.replace(0, suggestionInfo.mText.length(), suggestion);
                    numberOfSuggestions++;
                    if (numberOfSuggestions >= suggestionInfos.length) {
                        return numberOfSuggestions;
                    }
                }
            }
            return numberOfSuggestions;
        }
    }

    @VisibleForTesting
    public class SuggestionsPopupWindow extends PinnedPopupWindow implements OnItemClickListener {
        private static final int MAX_NUMBER_SUGGESTIONS = SuggestionSpan.SUGGESTIONS_MAX_SIZE;

        // Key of intent extras for inserting new word into user dictionary.
        private static final String USER_DICTIONARY_EXTRA_WORD = "word";
        private static final String USER_DICTIONARY_EXTRA_LOCALE = "locale";

        private SuggestionInfo[] mSuggestionInfos;
        private int mNumberOfSuggestions;
        private boolean mCursorWasVisibleBeforeSuggestions;
        private boolean mIsShowingUp = false;
        private SuggestionAdapter mSuggestionsAdapter;
        private TextAppearanceSpan mHighlightSpan;  // TODO: Make mHighlightSpan final.
        private TextView mAddToDictionaryButton;
        private TextView mDeleteButton;
        private ListView mSuggestionListView;
        private final SuggestionSpanInfo mMisspelledSpanInfo = new SuggestionSpanInfo();
        private int mContainerMarginWidth;
        private int mContainerMarginTop;
        private LinearLayout mContainerView;
        private Context mContext;  // TODO: Make mContext final.

        private class CustomPopupWindow extends PopupWindow {

            @Override
            public void dismiss() {
                if (!isShowing()) {
                    return;
                }
                super.dismiss();
                getPositionListener().removeSubscriber(SuggestionsPopupWindow.this);

                // Safe cast since show() checks that mTextView.getText() is an Editable
                ((Spannable) mTextView.getText()).removeSpan(mSuggestionRangeSpan);

                mTextView.setCursorVisible(mCursorWasVisibleBeforeSuggestions);
                if (hasInsertionController() && !extractedTextModeWillBeStarted()) {
                    getInsertionController().show();
                }
            }
        }

        public SuggestionsPopupWindow() {
            mCursorWasVisibleBeforeSuggestions = mCursorVisible;
        }

        @Override
        protected void setUp() {
            mContext = applyDefaultTheme(mTextView.getContext());
            mHighlightSpan = new TextAppearanceSpan(mContext,
                    mTextView.mTextEditSuggestionHighlightStyle);
        }

        private Context applyDefaultTheme(Context originalContext) {
            TypedArray a = originalContext.obtainStyledAttributes(
                    new int[]{com.android.internal.R.attr.isLightTheme});
            boolean isLightTheme = a.getBoolean(0, true);
            int themeId = isLightTheme ? R.style.ThemeOverlay_Material_Light
                    : R.style.ThemeOverlay_Material_Dark;
            a.recycle();
            return new ContextThemeWrapper(originalContext, themeId);
        }

        @Override
        protected void createPopupWindow() {
            mPopupWindow = new CustomPopupWindow();
            mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
            mPopupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
            mPopupWindow.setFocusable(true);
            mPopupWindow.setClippingEnabled(false);
        }

        @Override
        protected void initContentView() {
            final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);
            mContentView = (ViewGroup) inflater.inflate(
                    mTextView.mTextEditSuggestionContainerLayout, null);

            mContainerView = (LinearLayout) mContentView.findViewById(
                    com.android.internal.R.id.suggestionWindowContainer);
            ViewGroup.MarginLayoutParams lp =
                    (ViewGroup.MarginLayoutParams) mContainerView.getLayoutParams();
            mContainerMarginWidth = lp.leftMargin + lp.rightMargin;
            mContainerMarginTop = lp.topMargin;
            mClippingLimitLeft = lp.leftMargin;
            mClippingLimitRight = lp.rightMargin;

            mSuggestionListView = (ListView) mContentView.findViewById(
                    com.android.internal.R.id.suggestionContainer);

            mSuggestionsAdapter = new SuggestionAdapter();
            mSuggestionListView.setAdapter(mSuggestionsAdapter);
            mSuggestionListView.setOnItemClickListener(this);

            // Inflate the suggestion items once and for all.
            mSuggestionInfos = new SuggestionInfo[MAX_NUMBER_SUGGESTIONS];
            for (int i = 0; i < mSuggestionInfos.length; i++) {
                mSuggestionInfos[i] = new SuggestionInfo();
            }

            mAddToDictionaryButton = (TextView) mContentView.findViewById(
                    com.android.internal.R.id.addToDictionaryButton);
            mAddToDictionaryButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    final SuggestionSpan misspelledSpan =
                            findEquivalentSuggestionSpan(mMisspelledSpanInfo);
                    if (misspelledSpan == null) {
                        // Span has been removed.
                        return;
                    }
                    final Editable editable = (Editable) mTextView.getText();
                    final int spanStart = editable.getSpanStart(misspelledSpan);
                    final int spanEnd = editable.getSpanEnd(misspelledSpan);
                    if (spanStart < 0 || spanEnd <= spanStart) {
                        return;
                    }
                    final String originalText = TextUtils.substring(editable, spanStart, spanEnd);

                    final Intent intent = new Intent(Settings.ACTION_USER_DICTIONARY_INSERT);
                    intent.putExtra(USER_DICTIONARY_EXTRA_WORD, originalText);
                    intent.putExtra(USER_DICTIONARY_EXTRA_LOCALE,
                            mTextView.getTextServicesLocale().toString());
                    intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
                    mTextView.getContext().startActivity(intent);
                    // There is no way to know if the word was indeed added. Re-check.
                    // TODO The ExtractEditText should remove the span in the original text instead
                    editable.removeSpan(mMisspelledSpanInfo.mSuggestionSpan);
                    Selection.setSelection(editable, spanEnd);
                    updateSpellCheckSpans(spanStart, spanEnd, false);
                    hideWithCleanUp();
                }
            });

            mDeleteButton = (TextView) mContentView.findViewById(
                    com.android.internal.R.id.deleteButton);
            mDeleteButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    final Editable editable = (Editable) mTextView.getText();

                    final int spanUnionStart = editable.getSpanStart(mSuggestionRangeSpan);
                    int spanUnionEnd = editable.getSpanEnd(mSuggestionRangeSpan);
                    if (spanUnionStart >= 0 && spanUnionEnd > spanUnionStart) {
                        // Do not leave two adjacent spaces after deletion, or one at beginning of
                        // text
                        if (spanUnionEnd < editable.length() &&
                                Character.isSpaceChar(editable.charAt(spanUnionEnd)) &&
                                (spanUnionStart == 0 ||
                                Character.isSpaceChar(editable.charAt(spanUnionStart - 1)))) {
                            spanUnionEnd = spanUnionEnd + 1;
                        }
                        mTextView.deleteText_internal(spanUnionStart, spanUnionEnd);
                    }
                    hideWithCleanUp();
                }
            });

        }

        public boolean isShowingUp() {
            return mIsShowingUp;
        }

        public void onParentLostFocus() {
            mIsShowingUp = false;
        }

        private class SuggestionAdapter extends BaseAdapter {
            private LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);

            @Override
            public int getCount() {
                return mNumberOfSuggestions;
            }

            @Override
            public Object getItem(int position) {
                return mSuggestionInfos[position];
            }

            @Override
            public long getItemId(int position) {
                return position;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                TextView textView = (TextView) convertView;

                if (textView == null) {
                    textView = (TextView) mInflater.inflate(mTextView.mTextEditSuggestionItemLayout,
                            parent, false);
                }

                final SuggestionInfo suggestionInfo = mSuggestionInfos[position];
                textView.setText(suggestionInfo.mText);
                return textView;
            }
        }

        @VisibleForTesting
        public ViewGroup getContentViewForTesting() {
            return mContentView;
        }

        @Override
        public void show() {
            if (!(mTextView.getText() instanceof Editable)) return;
            if (extractedTextModeWillBeStarted()) {
                return;
            }

            if (updateSuggestions()) {
                mCursorWasVisibleBeforeSuggestions = mCursorVisible;
                mTextView.setCursorVisible(false);
                mIsShowingUp = true;
                super.show();
            }
        }

        @Override
        protected void measureContent() {
            final DisplayMetrics displayMetrics = mTextView.getResources().getDisplayMetrics();
            final int horizontalMeasure = View.MeasureSpec.makeMeasureSpec(
                    displayMetrics.widthPixels, View.MeasureSpec.AT_MOST);
            final int verticalMeasure = View.MeasureSpec.makeMeasureSpec(
                    displayMetrics.heightPixels, View.MeasureSpec.AT_MOST);

            int width = 0;
            View view = null;
            for (int i = 0; i < mNumberOfSuggestions; i++) {
                view = mSuggestionsAdapter.getView(i, view, mContentView);
                view.getLayoutParams().width = LayoutParams.WRAP_CONTENT;
                view.measure(horizontalMeasure, verticalMeasure);
                width = Math.max(width, view.getMeasuredWidth());
            }

            if (mAddToDictionaryButton.getVisibility() != View.GONE) {
                mAddToDictionaryButton.measure(horizontalMeasure, verticalMeasure);
                width = Math.max(width, mAddToDictionaryButton.getMeasuredWidth());
            }

            mDeleteButton.measure(horizontalMeasure, verticalMeasure);
            width = Math.max(width, mDeleteButton.getMeasuredWidth());

            width += mContainerView.getPaddingLeft() + mContainerView.getPaddingRight()
                    + mContainerMarginWidth;

            // Enforce the width based on actual text widths
            mContentView.measure(
                    View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY),
                    verticalMeasure);

            Drawable popupBackground = mPopupWindow.getBackground();
            if (popupBackground != null) {
                if (mTempRect == null) mTempRect = new Rect();
                popupBackground.getPadding(mTempRect);
                width += mTempRect.left + mTempRect.right;
            }
            mPopupWindow.setWidth(width);
        }

        @Override
        protected int getTextOffset() {
            return (mTextView.getSelectionStart() + mTextView.getSelectionStart()) / 2;
        }

        @Override
        protected int getVerticalLocalPosition(int line) {
            return mTextView.getLayout().getLineBottom(line) - mContainerMarginTop;
        }

        @Override
        protected int clipVertically(int positionY) {
            final int height = mContentView.getMeasuredHeight();
            final DisplayMetrics displayMetrics = mTextView.getResources().getDisplayMetrics();
            return Math.min(positionY, displayMetrics.heightPixels - height);
        }

        private void hideWithCleanUp() {
            for (final SuggestionInfo info : mSuggestionInfos) {
                info.clear();
            }
            mMisspelledSpanInfo.clear();
            hide();
        }

        private boolean updateSuggestions() {
            Spannable spannable = (Spannable) mTextView.getText();
            mNumberOfSuggestions =
                    mSuggestionHelper.getSuggestionInfo(mSuggestionInfos, mMisspelledSpanInfo);
            if (mNumberOfSuggestions == 0 && mMisspelledSpanInfo.mSuggestionSpan == null) {
                return false;
            }

            int spanUnionStart = mTextView.getText().length();
            int spanUnionEnd = 0;

            for (int i = 0; i < mNumberOfSuggestions; i++) {
                final SuggestionSpanInfo spanInfo = mSuggestionInfos[i].mSuggestionSpanInfo;
                spanUnionStart = Math.min(spanUnionStart, spanInfo.mSpanStart);
                spanUnionEnd = Math.max(spanUnionEnd, spanInfo.mSpanEnd);
            }
            if (mMisspelledSpanInfo.mSuggestionSpan != null) {
                spanUnionStart = Math.min(spanUnionStart, mMisspelledSpanInfo.mSpanStart);
                spanUnionEnd = Math.max(spanUnionEnd, mMisspelledSpanInfo.mSpanEnd);
            }

            for (int i = 0; i < mNumberOfSuggestions; i++) {
                highlightTextDifferences(mSuggestionInfos[i], spanUnionStart, spanUnionEnd);
            }

            // Make "Add to dictionary" item visible if there is a span with the misspelled flag
            int addToDictionaryButtonVisibility = View.GONE;
            if (mMisspelledSpanInfo.mSuggestionSpan != null) {
                if (mMisspelledSpanInfo.mSpanStart >= 0
                        && mMisspelledSpanInfo.mSpanEnd > mMisspelledSpanInfo.mSpanStart) {
                    addToDictionaryButtonVisibility = View.VISIBLE;
                }
            }
            mAddToDictionaryButton.setVisibility(addToDictionaryButtonVisibility);

            if (mSuggestionRangeSpan == null) mSuggestionRangeSpan = new SuggestionRangeSpan();
            final int underlineColor;
            if (mNumberOfSuggestions != 0) {
                underlineColor =
                        mSuggestionInfos[0].mSuggestionSpanInfo.mSuggestionSpan.getUnderlineColor();
            } else {
                underlineColor = mMisspelledSpanInfo.mSuggestionSpan.getUnderlineColor();
            }

            if (underlineColor == 0) {
                // Fallback on the default highlight color when the first span does not provide one
                mSuggestionRangeSpan.setBackgroundColor(mTextView.mHighlightColor);
            } else {
                final float BACKGROUND_TRANSPARENCY = 0.4f;
                final int newAlpha = (int) (Color.alpha(underlineColor) * BACKGROUND_TRANSPARENCY);
                mSuggestionRangeSpan.setBackgroundColor(
                        (underlineColor & 0x00FFFFFF) + (newAlpha << 24));
            }
            spannable.setSpan(mSuggestionRangeSpan, spanUnionStart, spanUnionEnd,
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            mSuggestionsAdapter.notifyDataSetChanged();
            return true;
        }

        private void highlightTextDifferences(SuggestionInfo suggestionInfo, int unionStart,
                int unionEnd) {
            final Spannable text = (Spannable) mTextView.getText();
            final int spanStart = suggestionInfo.mSuggestionSpanInfo.mSpanStart;
            final int spanEnd = suggestionInfo.mSuggestionSpanInfo.mSpanEnd;

            // Adjust the start/end of the suggestion span
            suggestionInfo.mSuggestionStart = spanStart - unionStart;
            suggestionInfo.mSuggestionEnd = suggestionInfo.mSuggestionStart
                    + suggestionInfo.mText.length();

            suggestionInfo.mText.setSpan(mHighlightSpan, 0, suggestionInfo.mText.length(),
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            // Add the text before and after the span.
            final String textAsString = text.toString();
            suggestionInfo.mText.insert(0, textAsString.substring(unionStart, spanStart));
            suggestionInfo.mText.append(textAsString.substring(spanEnd, unionEnd));
        }

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            SuggestionInfo suggestionInfo = mSuggestionInfos[position];
            replaceWithSuggestion(suggestionInfo);
            hideWithCleanUp();
        }
    }

    /**
     * An ActionMode Callback class that is used to provide actions while in text insertion or
     * selection mode.
     *
     * The default callback provides a subset of Select All, Cut, Copy, Paste, Share and Replace
     * actions, depending on which of these this TextView supports and the current selection.
     */
    private class TextActionModeCallback extends ActionMode.Callback2 {
        private final Path mSelectionPath = new Path();
        private final RectF mSelectionBounds = new RectF();
        private final boolean mHasSelection;

        private int mHandleHeight;

        public TextActionModeCallback(boolean hasSelection) {
            mHasSelection = hasSelection;
            if (mHasSelection) {
                SelectionModifierCursorController selectionController = getSelectionController();
                if (selectionController.mStartHandle == null) {
                    // As these are for initializing selectionController, hide() must be called.
                    selectionController.initDrawables();
                    selectionController.initHandles();
                    selectionController.hide();
                }
                mHandleHeight = Math.max(
                        mSelectHandleLeft.getMinimumHeight(),
                        mSelectHandleRight.getMinimumHeight());
            } else {
                InsertionPointCursorController insertionController = getInsertionController();
                if (insertionController != null) {
                    insertionController.getHandle();
                    mHandleHeight = mSelectHandleCenter.getMinimumHeight();
                }
            }
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            mode.setTitle(null);
            mode.setSubtitle(null);
            mode.setTitleOptionalHint(true);
            populateMenuWithItems(menu);

            Callback customCallback = getCustomCallback();
            if (customCallback != null) {
                if (!customCallback.onCreateActionMode(mode, menu)) {
                    // The custom mode can choose to cancel the action mode, dismiss selection.
                    Selection.setSelection((Spannable) mTextView.getText(),
                            mTextView.getSelectionEnd());
                    return false;
                }
            }

            if (mTextView.canProcessText()) {
                mProcessTextIntentActionsHandler.onInitializeMenu(menu);
            }

            if (menu.hasVisibleItems() || mode.getCustomView() != null) {
                if (mHasSelection && !mTextView.hasTransientState()) {
                    mTextView.setHasTransientState(true);
                }
                return true;
            } else {
                return false;
            }
        }

        private Callback getCustomCallback() {
            return mHasSelection
                    ? mCustomSelectionActionModeCallback
                    : mCustomInsertionActionModeCallback;
        }

        private void populateMenuWithItems(Menu menu) {
            if (mTextView.canCut()) {
                menu.add(Menu.NONE, TextView.ID_CUT, MENU_ITEM_ORDER_CUT,
                        com.android.internal.R.string.cut).
                    setAlphabeticShortcut('x').
                    setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
            }

            if (mTextView.canCopy()) {
                menu.add(Menu.NONE, TextView.ID_COPY, MENU_ITEM_ORDER_COPY,
                        com.android.internal.R.string.copy).
                    setAlphabeticShortcut('c').
                    setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
            }

            if (mTextView.canPaste()) {
                menu.add(Menu.NONE, TextView.ID_PASTE, MENU_ITEM_ORDER_PASTE,
                        com.android.internal.R.string.paste).
                    setAlphabeticShortcut('v').
                    setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
            }

            if (mTextView.canShare()) {
                menu.add(Menu.NONE, TextView.ID_SHARE, MENU_ITEM_ORDER_SHARE,
                        com.android.internal.R.string.share).
                    setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
            }

            updateSelectAllItem(menu);
            updateReplaceItem(menu);
        }

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            updateSelectAllItem(menu);
            updateReplaceItem(menu);

            Callback customCallback = getCustomCallback();
            if (customCallback != null) {
                return customCallback.onPrepareActionMode(mode, menu);
            }
            return true;
        }

        private void updateSelectAllItem(Menu menu) {
            boolean canSelectAll = mTextView.canSelectAllText();
            boolean selectAllItemExists = menu.findItem(TextView.ID_SELECT_ALL) != null;
            if (canSelectAll && !selectAllItemExists) {
                menu.add(Menu.NONE, TextView.ID_SELECT_ALL, MENU_ITEM_ORDER_SELECT_ALL,
                        com.android.internal.R.string.selectAll)
                    .setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
            } else if (!canSelectAll && selectAllItemExists) {
                menu.removeItem(TextView.ID_SELECT_ALL);
            }
        }

        private void updateReplaceItem(Menu menu) {
            boolean canReplace = mTextView.isSuggestionsEnabled() && shouldOfferToShowSuggestions();
            boolean replaceItemExists = menu.findItem(TextView.ID_REPLACE) != null;
            if (canReplace && !replaceItemExists) {