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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
      5  * in compliance with the License. You may obtain a copy of the License at
      6  *
      7  * http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the License
     10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
     11  * or implied. See the License for the specific language governing permissions and limitations under
     12  * the License.
     13  */
     14 package com.example.android.leanback;
     15 
     16 import android.content.Context;
     17 import android.graphics.drawable.Drawable;
     18 import android.os.Bundle;
     19 import android.support.v17.leanback.widget.ImageCardView;
     20 import android.support.v17.leanback.widget.Presenter;
     21 import android.support.v4.content.res.ResourcesCompat;
     22 import android.text.TextUtils;
     23 import android.util.Log;
     24 import android.view.ContextThemeWrapper;
     25 import android.view.View.MeasureSpec;
     26 import android.view.ViewGroup;
     27 import android.view.ViewGroup.LayoutParams;
     28 
     29 import java.util.List;
     30 import java.util.Random;
     31 
     32 public class CardPresenter extends Presenter {
     33 
     34     // String constant
     35     private static final String TAG = "CardPresenter";
     36     public static final String IMAGE = "ImageResourceId";
     37     public static final String TITLE = "Title";
     38     public static final String CONTENT = "Content";
     39 
     40     private static final int IMAGE_HEIGHT_DP = 120;
     41 
     42     private static Random sRand = new Random();
     43     private int mRowHeight = 0;
     44     private int mExpandedRowHeight = 0;
     45 
     46     private int mCardThemeResId;
     47     private Context mContextThemeWrapper;
     48 
     49     public CardPresenter(int cardThemeResId) {
     50         mCardThemeResId = cardThemeResId;
     51     }
     52 
     53     public CardPresenter() {
     54         mCardThemeResId = 0;
     55     }
     56 
     57     private void setupRowHeights(Context context) {
     58         if (mRowHeight == 0) {
     59             float density = context.getResources().getDisplayMetrics().density;
     60             int height = (int) (IMAGE_HEIGHT_DP * density + 0.5f);
     61 
     62             ImageCardView v = new ImageCardView(context);
     63             v.setMainImageDimensions(LayoutParams.WRAP_CONTENT, height);
     64             v.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
     65             mRowHeight = v.getMeasuredHeight();
     66             v.setActivated(true);
     67             v.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
     68             mExpandedRowHeight = v.getMeasuredHeight();
     69         }
     70     }
     71 
     72     public int getRowHeight(Context context) {
     73         setupRowHeights(context);
     74         return mRowHeight;
     75     }
     76 
     77     public int getExpandedRowHeight(Context context) {
     78         setupRowHeights(context);
     79         return mExpandedRowHeight;
     80     }
     81 
     82     @Override
     83     public ViewHolder onCreateViewHolder(ViewGroup parent) {
     84         Log.d(TAG, "onCreateViewHolder");
     85         Context context = parent.getContext();
     86         if (mCardThemeResId != 0) {
     87             if (mContextThemeWrapper == null) {
     88                 mContextThemeWrapper = new ContextThemeWrapper(context, mCardThemeResId);
     89             }
     90             context = mContextThemeWrapper;
     91         }
     92         ImageCardView v = new ImageCardView(context);
     93         v.setFocusable(true);
     94         v.setFocusableInTouchMode(true);
     95         // Randomly makes image view crop as a square or just stretch to original
     96         // aspect ratio.
     97         if (sRand.nextBoolean()) {
     98             v.setMainImageAdjustViewBounds(false);
     99             v.setMainImageDimensions(getRowHeight(parent.getContext()),
    100                     getRowHeight(parent.getContext()));
    101         } else {
    102             v.setMainImageAdjustViewBounds(true);
    103             v.setMainImageDimensions(LayoutParams.WRAP_CONTENT,
    104                     getRowHeight(parent.getContext()));
    105         }
    106         return new ViewHolder(v);
    107     }
    108 
    109     @Override
    110     public void onBindViewHolder(ViewHolder viewHolder, Object item) {
    111         Log.d(TAG, "onBindViewHolder for " + item.toString());
    112         PhotoItem photoItem = (PhotoItem) item;
    113         final Context context = viewHolder.view.getContext();
    114         Drawable drawable = ResourcesCompat.getDrawable(context.getResources(),
    115                 photoItem.getImageResourceId(), context.getTheme());
    116         ((ImageCardView) viewHolder.view).setMainImage(drawable);
    117         ((ImageCardView) viewHolder.view).setTitleText(photoItem.getTitle());
    118         if (!TextUtils.isEmpty(photoItem.getContent())) {
    119             ((ImageCardView) viewHolder.view).setContentText(photoItem.getContent());
    120         }
    121     }
    122 
    123     @Override
    124     public void onBindViewHolder(ViewHolder viewHolder, Object item, List<Object> payloads) {
    125         if (payloads.isEmpty()) {
    126             super.onBindViewHolder(viewHolder, item, payloads);
    127         } else {
    128             PhotoItem photoItem = (PhotoItem) item;
    129             Bundle o = (Bundle) payloads.get(0);
    130             for (String key : o.keySet()) {
    131                 if (key.equals(IMAGE)) {
    132                     final Context context = viewHolder.view.getContext();
    133                     Drawable drawable = ResourcesCompat.getDrawable(context.getResources(),
    134                             photoItem.getImageResourceId(), context.getTheme());
    135                     ((ImageCardView) viewHolder.view).setMainImage(drawable);
    136                 }
    137                 if (key.equals(CONTENT)) {
    138                     ((ImageCardView) viewHolder.view).setContentText(photoItem.getContent());
    139                 }
    140                 if (key.equals(TITLE)) {
    141                     ((ImageCardView) viewHolder.view).setTitleText(photoItem.getTitle());
    142                 }
    143             }
    144         }
    145     }
    146 
    147     @Override
    148     public void onUnbindViewHolder(ViewHolder viewHolder) {
    149         Log.d(TAG, "onUnbindViewHolder");
    150     }
    151 }
    152