content: /*
   * Copyright 2013 Chris Banes
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.zhaojian.jolly.views;
  
  import android.content.Context;
  import android.util.AttributeSet;
  import android.widget.Checkable;
  import android.widget.ImageView;
  
  public class CheckableImageView extends ImageView implements Checkable {
  
      public CheckableImageView(Context context) {
          super(context);
      }
  
      public CheckableImageView(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      private static final int[] CheckedStateSet = {android.R.attr.state_checked};
  
      private boolean mChecked = false;
  
      public boolean isChecked() {
          return mChecked;
      }
  
      public void setChecked(boolean b) {
          if (b != mChecked) {
              mChecked = b;
              refreshDrawableState();
          }
      }
  
      public void toggle() {
          setChecked(!mChecked);
      }
  
      @Override
      public int[] onCreateDrawableState(int extraSpace) {
          final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
          if (isChecked()) {
              mergeDrawableStates(drawableState, CheckedStateSet);
          }
          return drawableState;
      }
  
      @Override
      protected void drawableStateChanged() {
          super.drawableStateChanged();
          invalidate();
      }
  
  }
  