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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.inputmethodservice;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import android.view.inputmethod.ExtractedText;
     22 import android.widget.EditText;
     23 
     24 /***
     25  * Specialization of {@link EditText} for showing and interacting with the
     26  * extracted text in a full-screen input method.
     27  */
     28 public class ExtractEditText extends EditText {
     29     private InputMethodService mIME;
     30     private int mSettingExtractedText;
     31 
     32     public ExtractEditText(Context context) {
     33         super(context, null);
     34     }
     35 
     36     public ExtractEditText(Context context, AttributeSet attrs) {
     37         super(context, attrs, com.android.internal.R.attr.editTextStyle);
     38     }
     39 
     40     public ExtractEditText(Context context, AttributeSet attrs, int defStyle) {
     41         super(context, attrs, defStyle);
     42     }
     43 
     44     void setIME(InputMethodService ime) {
     45         mIME = ime;
     46     }
     47 
     48     /**
     49      * Start making changes that will not be reported to the client.  That
     50      * is, {@link #onSelectionChanged(int, int)} will not result in sending
     51      * the new selection to the client
     52      */
     53     public void startInternalChanges() {
     54         mSettingExtractedText += 1;
     55     }
     56 
     57     /**
     58      * Finish making changes that will not be reported to the client.  That
     59      * is, {@link #onSelectionChanged(int, int)} will not result in sending
     60      * the new selection to the client
     61      */
     62     public void finishInternalChanges() {
     63         mSettingExtractedText -= 1;
     64     }
     65 
     66     /**
     67      * Implement just to keep track of when we are setting text from the
     68      * client (vs. seeing changes in ourself from the user).
     69      */
     70     @Override public void setExtractedText(ExtractedText text) {
     71         try {
     72             mSettingExtractedText++;
     73             super.setExtractedText(text);
     74         } finally {
     75             mSettingExtractedText--;
     76         }
     77     }
     78 
     79     /**
     80      * Report to the underlying text editor about selection changes.
     81      */
     82     @Override protected void onSelectionChanged(int selStart, int selEnd) {
     83         if (mSettingExtractedText == 0 && mIME != null && selStart >= 0 && selEnd >= 0) {
     84             mIME.onExtractedSelectionChanged(selStart, selEnd);
     85         }
     86     }
     87 
     88     /**
     89      * Redirect clicks to the IME for handling there.  First allows any
     90      * on click handler to run, though.
     91      */
     92     @Override public boolean performClick() {
     93         if (!super.performClick() && mIME != null) {
     94             mIME.onExtractedTextClicked();
     95             return true;
     96         }
     97         return false;
     98     }
     99 
    100     @Override public boolean onTextContextMenuItem(int id) {
    101         // Horrible hack: select word option has to be handled by original view to work.
    102         if (mIME != null && id != android.R.id.startSelectingText) {
    103             if (mIME.onExtractTextContextMenuItem(id)) {
    104                 return true;
    105             }
    106         }
    107         return super.onTextContextMenuItem(id);
    108     }
    109 
    110     /**
    111      * We are always considered to be an input method target.
    112      */
    113     @Override
    114     public boolean isInputMethodTarget() {
    115         return true;
    116     }
    117 
    118     /**
    119      * Return true if the edit text is currently showing a scroll bar.
    120      */
    121     public boolean hasVerticalScrollBar() {
    122         return computeVerticalScrollRange() > computeVerticalScrollExtent();
    123     }
    124 
    125     /**
    126      * Pretend like the window this view is in always has focus, so its
    127      * highlight and cursor will be displayed.
    128      */
    129     @Override public boolean hasWindowFocus() {
    130         return this.isEnabled();
    131     }
    132 
    133     /**
    134      * Pretend like this view always has focus, so its
    135      * highlight and cursor will be displayed.
    136      */
    137     @Override public boolean isFocused() {
    138         return this.isEnabled();
    139     }
    140 
    141     /**
    142      * Pretend like this view always has focus, so its
    143      * highlight and cursor will be displayed.
    144      */
    145     @Override public boolean hasFocus() {
    146         return this.isEnabled();
    147     }
    148 }
    149