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