1 /* 2 * Copyright (C) 2015 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.settings; 17 18 import android.content.Context; 19 import android.util.AttributeSet; 20 import android.util.TypedValue; 21 import android.view.View; 22 import android.widget.Checkable; 23 import android.widget.LinearLayout; 24 25 public class CheckableLinearLayout extends LinearLayout implements Checkable { 26 27 private boolean mChecked; 28 private float mDisabledAlpha; 29 CheckableLinearLayout(Context context, AttributeSet attrs)30 public CheckableLinearLayout(Context context, AttributeSet attrs) { 31 super(context, attrs); 32 TypedValue alpha = new TypedValue(); 33 context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, alpha, true); 34 mDisabledAlpha = alpha.getFloat(); 35 } 36 37 @Override setEnabled(boolean enabled)38 public void setEnabled(boolean enabled) { 39 super.setEnabled(enabled); 40 final int N = getChildCount(); 41 for (int i = 0; i < N; i++) { 42 getChildAt(i).setAlpha(enabled ? 1 : mDisabledAlpha); 43 } 44 } 45 46 @Override setChecked(boolean checked)47 public void setChecked(boolean checked) { 48 mChecked = checked; 49 updateChecked(); 50 } 51 52 @Override isChecked()53 public boolean isChecked() { 54 return mChecked; 55 } 56 57 @Override toggle()58 public void toggle() { 59 setChecked(!mChecked); 60 } 61 updateChecked()62 private void updateChecked() { 63 final int N = getChildCount(); 64 for (int i = 0; i < N; i++) { 65 View child = getChildAt(i); 66 if (child instanceof Checkable) { 67 ((Checkable) child).setChecked(mChecked); 68 } 69 } 70 } 71 72 } 73