Home | History | Annotate | Download | only in com.example.android.customchoicelist
      1 /*
      2  * Copyright 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 
     17 package com.example.android.customchoicelist;
     18 
     19 import android.content.Context;
     20 import android.util.AttributeSet;
     21 import android.util.Log;
     22 import android.view.View;
     23 import android.widget.Checkable;
     24 import android.widget.LinearLayout;
     25 
     26 /**
     27  * This is a simple wrapper for {@link android.widget.LinearLayout} that implements the {@link android.widget.Checkable}
     28  * interface by keeping an internal 'checked' state flag.
     29  * <p>
     30  * This can be used as the root view for a custom list item layout for
     31  * {@link android.widget.AbsListView} elements with a
     32  * {@link android.widget.AbsListView#setChoiceMode(int) choiceMode} set.
     33  */
     34 public class CheckableLinearLayout extends LinearLayout implements Checkable {
     35     private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
     36 
     37     private boolean mChecked = false;
     38 
     39     public CheckableLinearLayout(Context context, AttributeSet attrs) {
     40         super(context, attrs);
     41     }
     42 
     43     public boolean isChecked() {
     44         return mChecked;
     45     }
     46 
     47     public void setChecked(boolean b) {
     48         if (b != mChecked) {
     49             mChecked = b;
     50             refreshDrawableState();
     51         }
     52     }
     53 
     54     public void toggle() {
     55         setChecked(!mChecked);
     56     }
     57 
     58     @Override
     59     public int[] onCreateDrawableState(int extraSpace) {
     60         final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
     61         if (isChecked()) {
     62             mergeDrawableStates(drawableState, CHECKED_STATE_SET);
     63         }
     64         return drawableState;
     65     }
     66 }
     67