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 17package androidx.media.widget; 18 19import android.content.Context; 20import android.graphics.Canvas; 21import android.os.Looper; 22import android.util.AttributeSet; 23 24import androidx.annotation.Nullable; 25import androidx.annotation.RequiresApi; 26import androidx.media.subtitle.SubtitleController.Anchor; 27import androidx.media.subtitle.SubtitleTrack.RenderingWidget; 28 29@RequiresApi(21) 30class SubtitleView extends BaseLayout implements Anchor { 31 private static final String TAG = "SubtitleView"; 32 33 private RenderingWidget mSubtitleWidget; 34 private RenderingWidget.OnChangedListener mSubtitlesChangedListener; 35 36 SubtitleView(Context context) { 37 this(context, null); 38 } 39 40 SubtitleView(Context context, @Nullable AttributeSet attrs) { 41 this(context, attrs, 0); 42 } 43 44 SubtitleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { 45 this(context, attrs, defStyleAttr, 0); 46 } 47 48 SubtitleView( 49 Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { 50 super(context, attrs, defStyleAttr, defStyleRes); 51 } 52 53 @Override 54 public void setSubtitleWidget(RenderingWidget subtitleWidget) { 55 if (mSubtitleWidget == subtitleWidget) { 56 return; 57 } 58 59 final boolean attachedToWindow = isAttachedToWindow(); 60 if (mSubtitleWidget != null) { 61 if (attachedToWindow) { 62 mSubtitleWidget.onDetachedFromWindow(); 63 } 64 65 mSubtitleWidget.setOnChangedListener(null); 66 } 67 mSubtitleWidget = subtitleWidget; 68 69 if (subtitleWidget != null) { 70 if (mSubtitlesChangedListener == null) { 71 mSubtitlesChangedListener = new RenderingWidget.OnChangedListener() { 72 @Override 73 public void onChanged(RenderingWidget renderingWidget) { 74 invalidate(); 75 } 76 }; 77 } 78 79 setWillNotDraw(false); 80 subtitleWidget.setOnChangedListener(mSubtitlesChangedListener); 81 82 if (attachedToWindow) { 83 subtitleWidget.onAttachedToWindow(); 84 requestLayout(); 85 } 86 } else { 87 setWillNotDraw(true); 88 } 89 90 invalidate(); 91 } 92 93 @Override 94 public Looper getSubtitleLooper() { 95 return Looper.getMainLooper(); 96 } 97 98 @Override 99 public void onAttachedToWindow() { 100 super.onAttachedToWindow(); 101 102 if (mSubtitleWidget != null) { 103 mSubtitleWidget.onAttachedToWindow(); 104 } 105 } 106 107 @Override 108 public void onDetachedFromWindow() { 109 super.onDetachedFromWindow(); 110 111 if (mSubtitleWidget != null) { 112 mSubtitleWidget.onDetachedFromWindow(); 113 } 114 } 115 116 @Override 117 public void onLayout(boolean changed, int left, int top, int right, int bottom) { 118 super.onLayout(changed, left, top, right, bottom); 119 120 if (mSubtitleWidget != null) { 121 final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 122 final int height = getHeight() - getPaddingTop() - getPaddingBottom(); 123 124 mSubtitleWidget.setSize(width, height); 125 } 126 } 127 128 @Override 129 public void draw(Canvas canvas) { 130 super.draw(canvas); 131 132 if (mSubtitleWidget != null) { 133 final int saveCount = canvas.save(); 134 canvas.translate(getPaddingLeft(), getPaddingTop()); 135 mSubtitleWidget.draw(canvas); 136 canvas.restoreToCount(saveCount); 137 } 138 } 139 140 @Override 141 public CharSequence getAccessibilityClassName() { 142 return SubtitleView.class.getName(); 143 } 144} 145