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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.tv.tuner.cc;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import com.android.tv.tuner.data.nano.Track.AtscCaptionTrack;
     22 import com.android.tv.tuner.layout.ScaledLayout;
     23 
     24 /**
     25  * Layout containing the safe title area that helps the closed captions look more prominent. This is
     26  * required by CEA-708B.
     27  */
     28 public class CaptionLayout extends ScaledLayout {
     29     // The safe title area has 10% margins of the screen.
     30     private static final float SAFE_TITLE_AREA_SCALE_START_X = 0.1f;
     31     private static final float SAFE_TITLE_AREA_SCALE_END_X = 0.9f;
     32     private static final float SAFE_TITLE_AREA_SCALE_START_Y = 0.1f;
     33     private static final float SAFE_TITLE_AREA_SCALE_END_Y = 0.9f;
     34 
     35     private final ScaledLayout mSafeTitleAreaLayout;
     36     private AtscCaptionTrack mCaptionTrack;
     37 
     38     public CaptionLayout(Context context) {
     39         this(context, null);
     40     }
     41 
     42     public CaptionLayout(Context context, AttributeSet attrs) {
     43         this(context, attrs, 0);
     44     }
     45 
     46     public CaptionLayout(Context context, AttributeSet attrs, int defStyleAttr) {
     47         super(context, attrs, defStyleAttr);
     48         mSafeTitleAreaLayout = new ScaledLayout(context);
     49         addView(
     50                 mSafeTitleAreaLayout,
     51                 new ScaledLayoutParams(
     52                         SAFE_TITLE_AREA_SCALE_START_X, SAFE_TITLE_AREA_SCALE_END_X,
     53                         SAFE_TITLE_AREA_SCALE_START_Y, SAFE_TITLE_AREA_SCALE_END_Y));
     54     }
     55 
     56     public void addOrUpdateViewToSafeTitleArea(
     57             CaptionWindowLayout captionWindowLayout, ScaledLayoutParams scaledLayoutParams) {
     58         int index = mSafeTitleAreaLayout.indexOfChild(captionWindowLayout);
     59         if (index < 0) {
     60             mSafeTitleAreaLayout.addView(captionWindowLayout, scaledLayoutParams);
     61             return;
     62         }
     63         mSafeTitleAreaLayout.updateViewLayout(captionWindowLayout, scaledLayoutParams);
     64     }
     65 
     66     public void removeViewFromSafeTitleArea(CaptionWindowLayout captionWindowLayout) {
     67         mSafeTitleAreaLayout.removeView(captionWindowLayout);
     68     }
     69 
     70     public void setCaptionTrack(AtscCaptionTrack captionTrack) {
     71         mCaptionTrack = captionTrack;
     72     }
     73 
     74     public AtscCaptionTrack getCaptionTrack() {
     75         return mCaptionTrack;
     76     }
     77 }
     78