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      1 /*
      2  * Copyright (C) 2010 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.gallery3d.photoeditor;
     18 
     19 import android.content.Context;
     20 import android.content.res.Configuration;
     21 import android.util.AttributeSet;
     22 import android.view.LayoutInflater;
     23 import android.view.View;
     24 import android.widget.FrameLayout;
     25 
     26 import java.util.HashMap;
     27 import java.util.HashSet;
     28 import java.util.Map.Entry;
     29 
     30 /**
     31  * View that holds a single child and could be recreated/restored after orientation changes.
     32  */
     33 public abstract class RestorableView extends FrameLayout {
     34 
     35     private static final float ENABLED_ALPHA = 1;
     36     private static final float DISABLED_ALPHA = 0.47f;
     37 
     38     private final HashMap<Integer, Runnable> clickRunnables = new HashMap<Integer, Runnable>();
     39     private final HashSet<Integer> changedViews = new HashSet<Integer>();
     40     private final LayoutInflater inflater;
     41 
     42     public RestorableView(Context context, AttributeSet attrs) {
     43         super(context, attrs);
     44         inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     45     }
     46 
     47     protected abstract int childLayoutId();
     48 
     49     private void recreateChildView() {
     50         if (getChildCount() != 0) {
     51             removeAllViews();
     52         }
     53         inflater.inflate(childLayoutId(), this, true);
     54     }
     55 
     56     @Override
     57     protected void onFinishInflate() {
     58         super.onFinishInflate();
     59         recreateChildView();
     60     }
     61 
     62     @Override
     63     protected void onConfigurationChanged(Configuration newConfig) {
     64         super.onConfigurationChanged(newConfig);
     65 
     66         // Remember the removing child before recreating the child.
     67         View view = getChildAt(0);
     68         recreateChildView();
     69 
     70         // Restore its runnables and status of views that have been changed.
     71         for (Entry<Integer, Runnable> entry : clickRunnables.entrySet()) {
     72             setClickRunnable(entry.getKey(), entry.getValue());
     73         }
     74         for (int id : changedViews) {
     75             View changed = view.findViewById(id);
     76             setViewEnabled(id, changed.isEnabled());
     77             setViewSelected(id, changed.isSelected());
     78         }
     79     }
     80 
     81     public void setClickRunnable(int id, final Runnable r) {
     82         findViewById(id).setOnClickListener(new OnClickListener() {
     83 
     84             @Override
     85             public void onClick(View v) {
     86                 if (isEnabled()) {
     87                     r.run();
     88                 }
     89             }
     90         });
     91         clickRunnables.put(id, r);
     92     }
     93 
     94     public void setViewEnabled(int id, boolean enabled) {
     95         View view = findViewById(id);
     96         view.setEnabled(enabled);
     97         view.setAlpha(enabled ? ENABLED_ALPHA : DISABLED_ALPHA);
     98         // Track views whose enabled status has been updated.
     99         changedViews.add(id);
    100     }
    101 
    102     public void setViewSelected(int id, boolean selected) {
    103         findViewById(id).setSelected(selected);
    104         // Track views whose selected status has been updated.
    105         changedViews.add(id);
    106     }
    107 }
    108