1 /* 2 * Copyright 2018 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.widget; 18 19 import android.content.Context; 20 import android.graphics.Canvas; 21 import android.os.Looper; 22 import android.support.annotation.Nullable; 23 import android.util.AttributeSet; 24 import android.widget.FrameLayout; 25 26 import com.android.media.subtitle.SubtitleController.Anchor; 27 import com.android.media.subtitle.SubtitleTrack.RenderingWidget; 28 29 class SubtitleView extends FrameLayout implements Anchor { 30 private static final String TAG = "SubtitleView"; 31 32 private RenderingWidget mSubtitleWidget; 33 private RenderingWidget.OnChangedListener mSubtitlesChangedListener; 34 SubtitleView(Context context)35 public SubtitleView(Context context) { 36 this(context, null); 37 } 38 SubtitleView(Context context, @Nullable AttributeSet attrs)39 public SubtitleView(Context context, @Nullable AttributeSet attrs) { 40 this(context, attrs, 0); 41 } 42 SubtitleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr)43 public SubtitleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { 44 this(context, attrs, defStyleAttr, 0); 45 } 46 SubtitleView( Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes)47 public SubtitleView( 48 Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { 49 super(context, attrs, defStyleAttr, defStyleRes); 50 } 51 52 @Override setSubtitleWidget(RenderingWidget subtitleWidget)53 public void setSubtitleWidget(RenderingWidget subtitleWidget) { 54 if (mSubtitleWidget == subtitleWidget) { 55 return; 56 } 57 58 final boolean attachedToWindow = isAttachedToWindow(); 59 if (mSubtitleWidget != null) { 60 if (attachedToWindow) { 61 mSubtitleWidget.onDetachedFromWindow(); 62 } 63 64 mSubtitleWidget.setOnChangedListener(null); 65 } 66 mSubtitleWidget = subtitleWidget; 67 68 if (subtitleWidget != null) { 69 if (mSubtitlesChangedListener == null) { 70 mSubtitlesChangedListener = new RenderingWidget.OnChangedListener() { 71 @Override 72 public void onChanged(RenderingWidget renderingWidget) { 73 invalidate(); 74 } 75 }; 76 } 77 78 setWillNotDraw(false); 79 subtitleWidget.setOnChangedListener(mSubtitlesChangedListener); 80 81 if (attachedToWindow) { 82 subtitleWidget.onAttachedToWindow(); 83 requestLayout(); 84 } 85 } else { 86 setWillNotDraw(true); 87 } 88 89 invalidate(); 90 } 91 92 @Override getSubtitleLooper()93 public Looper getSubtitleLooper() { 94 return Looper.getMainLooper(); 95 } 96 97 @Override onAttachedToWindow()98 public void onAttachedToWindow() { 99 super.onAttachedToWindow(); 100 101 if (mSubtitleWidget != null) { 102 mSubtitleWidget.onAttachedToWindow(); 103 } 104 } 105 106 @Override onDetachedFromWindow()107 public void onDetachedFromWindow() { 108 super.onDetachedFromWindow(); 109 110 if (mSubtitleWidget != null) { 111 mSubtitleWidget.onDetachedFromWindow(); 112 } 113 } 114 115 @Override onLayout(boolean changed, int left, int top, int right, int bottom)116 public void onLayout(boolean changed, int left, int top, int right, int bottom) { 117 super.onLayout(changed, left, top, right, bottom); 118 119 if (mSubtitleWidget != null) { 120 final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 121 final int height = getHeight() - getPaddingTop() - getPaddingBottom(); 122 123 mSubtitleWidget.setSize(width, height); 124 } 125 } 126 127 @Override draw(Canvas canvas)128 public void draw(Canvas canvas) { 129 super.draw(canvas); 130 131 if (mSubtitleWidget != null) { 132 final int saveCount = canvas.save(); 133 canvas.translate(getPaddingLeft(), getPaddingTop()); 134 mSubtitleWidget.draw(canvas); 135 canvas.restoreToCount(saveCount); 136 } 137 } 138 139 @Override getAccessibilityClassName()140 public CharSequence getAccessibilityClassName() { 141 return SubtitleView.class.getName(); 142 } 143 } 144