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      1 /*
      2  * Copyright (C) 2013 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 package com.android.camera;
     17 
     18 import android.content.Context;
     19 import android.content.res.TypedArray;
     20 import android.util.AttributeSet;
     21 import android.view.View;
     22 
     23 /*
     24  * A toggle button that supports two states with images rendererd on top for each state.
     25  */
     26 public class ToggleImageButton extends MultiToggleImageButton {
     27     /*
     28      * Listener interface for button state changes.
     29      */
     30     public interface OnStateChangeListener {
     31         /*
     32          * @param view the ToggleImageButton that received the touch event
     33          * @param state the new state the button is in
     34          */
     35         public abstract void stateChanged(View view, boolean state);
     36     }
     37 
     38     private OnStateChangeListener mOnStateChangeListener;
     39         public ToggleImageButton(Context context) {
     40         super(context);
     41     }
     42 
     43     public ToggleImageButton(Context context, AttributeSet attrs) {
     44         super(context, attrs);
     45     }
     46 
     47     public ToggleImageButton(Context context, AttributeSet attrs, int defStyle) {
     48         super(context, attrs, defStyle);
     49     }
     50 
     51     /*
     52      * Set the state change listener.
     53      * @param onStateChangeListener the listener to set
     54      */
     55     public void setOnStateChangeListener(OnStateChangeListener onStateChangeListener) {
     56         mOnStateChangeListener = onStateChangeListener;
     57     }
     58 
     59     /*
     60      * Set the current button state, thus causing the state change listener to get called.
     61      * @param state the desired state
     62      */
     63     public void setState(boolean state) {
     64         super.setState(state ? 1 : 0);
     65     }
     66 
     67     @Override
     68     protected void init() {
     69         super.init();
     70         super.setOnStateChangeListener(new MultiToggleImageButton.OnStateChangeListener() {
     71             @Override
     72             public void stateChanged(View v, int state) {
     73                 if (mOnStateChangeListener != null) {
     74                     mOnStateChangeListener.stateChanged(v, (state == 1));
     75                 }
     76             }
     77         });
     78     }
     79 }