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      1 /*
      2  * Copyright (C) 2015 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 com.android.internal.widget;
     18 
     19 import android.annotation.Nullable;
     20 import android.content.Context;
     21 import android.text.BoringLayout;
     22 import android.text.Layout;
     23 import android.text.StaticLayout;
     24 import android.text.TextUtils;
     25 import android.util.AttributeSet;
     26 import android.view.RemotableViewMethod;
     27 import android.widget.RemoteViews;
     28 import android.widget.TextView;
     29 
     30 import com.android.internal.R;
     31 
     32 /**
     33  * A TextView that can float around an image on the end.
     34  *
     35  * @hide
     36  */
     37 @RemoteViews.RemoteView
     38 public class ImageFloatingTextView extends TextView {
     39 
     40     /** Number of lines from the top to indent */
     41     private int mIndentLines;
     42 
     43     /** Resolved layout direction */
     44     private int mResolvedDirection = LAYOUT_DIRECTION_UNDEFINED;
     45     private int mMaxLinesForHeight = -1;
     46     private boolean mFirstMeasure = true;
     47     private int mLayoutMaxLines = -1;
     48     private boolean mBlockLayouts;
     49 
     50     public ImageFloatingTextView(Context context) {
     51         this(context, null);
     52     }
     53 
     54     public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs) {
     55         this(context, attrs, 0);
     56     }
     57 
     58     public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
     59         this(context, attrs, defStyleAttr, 0);
     60     }
     61 
     62     public ImageFloatingTextView(Context context, AttributeSet attrs, int defStyleAttr,
     63             int defStyleRes) {
     64         super(context, attrs, defStyleAttr, defStyleRes);
     65     }
     66 
     67     @Override
     68     protected Layout makeSingleLayout(int wantWidth, BoringLayout.Metrics boring, int ellipsisWidth,
     69             Layout.Alignment alignment, boolean shouldEllipsize,
     70             TextUtils.TruncateAt effectiveEllipsize, boolean useSaved) {
     71         CharSequence text = getText() == null ? "" : getText();
     72         StaticLayout.Builder builder = StaticLayout.Builder.obtain(text, 0, text.length(),
     73                 getPaint(), wantWidth)
     74                 .setAlignment(alignment)
     75                 .setTextDirection(getTextDirectionHeuristic())
     76                 .setLineSpacing(getLineSpacingExtra(), getLineSpacingMultiplier())
     77                 .setIncludePad(getIncludeFontPadding())
     78                 .setBreakStrategy(Layout.BREAK_STRATEGY_HIGH_QUALITY)
     79                 .setHyphenationFrequency(Layout.HYPHENATION_FREQUENCY_FULL);
     80         int maxLines;
     81         if (mMaxLinesForHeight > 0) {
     82             maxLines = mMaxLinesForHeight;
     83         } else {
     84             maxLines = getMaxLines() >= 0 ? getMaxLines() : Integer.MAX_VALUE;
     85         }
     86         builder.setMaxLines(maxLines);
     87         mLayoutMaxLines = maxLines;
     88         if (shouldEllipsize) {
     89             builder.setEllipsize(effectiveEllipsize)
     90                     .setEllipsizedWidth(ellipsisWidth);
     91         }
     92 
     93         // we set the endmargin on the requested number of lines.
     94         int endMargin = getContext().getResources().getDimensionPixelSize(
     95                 R.dimen.notification_content_picture_margin);
     96         int[] margins = null;
     97         if (mIndentLines > 0) {
     98             margins = new int[mIndentLines + 1];
     99             for (int i = 0; i < mIndentLines; i++) {
    100                 margins[i] = endMargin;
    101             }
    102         }
    103         if (mResolvedDirection == LAYOUT_DIRECTION_RTL) {
    104             builder.setIndents(margins, null);
    105         } else {
    106             builder.setIndents(null, margins);
    107         }
    108 
    109         return builder.build();
    110     }
    111 
    112     @Override
    113     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    114         int height = MeasureSpec.getSize(heightMeasureSpec);
    115         // Lets calculate how many lines the given measurement allows us.
    116         int availableHeight = height - mPaddingTop - mPaddingBottom;
    117         int maxLines = availableHeight / getLineHeight();
    118         maxLines = Math.max(1, maxLines);
    119         if (getMaxLines() > 0) {
    120             maxLines = Math.min(getMaxLines(), maxLines);
    121         }
    122         if (maxLines != mMaxLinesForHeight) {
    123             mMaxLinesForHeight = maxLines;
    124             if (getLayout() != null && mMaxLinesForHeight != mLayoutMaxLines) {
    125                 // Invalidate layout.
    126                 mBlockLayouts = true;
    127                 setHint(getHint());
    128                 mBlockLayouts = false;
    129             }
    130         }
    131         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    132     }
    133 
    134     @Override
    135     public void requestLayout() {
    136         if (!mBlockLayouts) {
    137             super.requestLayout();
    138         }
    139     }
    140 
    141     @Override
    142     public void onRtlPropertiesChanged(int layoutDirection) {
    143         super.onRtlPropertiesChanged(layoutDirection);
    144 
    145         if (layoutDirection != mResolvedDirection && isLayoutDirectionResolved()) {
    146             mResolvedDirection = layoutDirection;
    147             if (mIndentLines > 0) {
    148                 // Invalidate layout.
    149                 setHint(getHint());
    150             }
    151         }
    152     }
    153 
    154     @RemotableViewMethod
    155     public void setHasImage(boolean hasImage) {
    156         setNumIndentLines(hasImage ? 2 : 0);
    157     }
    158 
    159     /**
    160      * @param lines the number of lines at the top that should be indented by indentEnd
    161      * @return whether a change was made
    162      */
    163     public boolean setNumIndentLines(int lines) {
    164         if (mIndentLines != lines) {
    165             mIndentLines = lines;
    166             // Invalidate layout.
    167             setHint(getHint());
    168             return true;
    169         }
    170         return false;
    171     }
    172 
    173     public int getLayoutHeight() {
    174         return getLayout().getHeight();
    175     }
    176 }
    177