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/*
* Copyright (C) 2021 The Android Open Source Project
*
* 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.android.settings.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.Checkable;
import android.widget.RelativeLayout;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
/**
* A RelativeLayout which implements {@link Checkable}. With this implementation, it could be used
* in the list item layout for {@link android.widget.AbsListView} to change UI after item click.
* Its checked state would be propagated to the checkable child.
*
* <p>
* To support accessibility, the state description is from the checkable view and is
* changed with {@link #setChecked(boolean)}. We make the checkable child unclickable, unfocusable
* and non-important for accessibility, so that the announcement wouldn't include
* the checkable view.
* <
*/
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {
private Checkable mCheckable;
private View mCheckableChild;
private boolean mChecked;
public CheckableRelativeLayout(Context context) {
super(context);
}
public CheckableRelativeLayout(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onFinishInflate() {
mCheckableChild = findFirstCheckableView(this);
if (mCheckableChild != null) {
mCheckableChild.setClickable(false);
mCheckableChild.setFocusable(false);
mCheckableChild.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
mCheckable = (Checkable) mCheckableChild;
mCheckable.setChecked(isChecked());
setStateDescriptionIfNeeded();
}
super.onFinishInflate();
}
@Nullable
private static View findFirstCheckableView(@NonNull ViewGroup viewGroup) {
final int childCount = viewGroup.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = viewGroup.getChildAt(i);
if (child instanceof Checkable) {
return child;
}
if (child instanceof ViewGroup) {
findFirstCheckableView((ViewGroup) child);
}
}
return null;
}
@Override
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
if (mCheckable != null) {
mCheckable.setChecked(checked);
}
}
setStateDescriptionIfNeeded();
notifyViewAccessibilityStateChangedIfNeeded(
AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);
}
private void setStateDescriptionIfNeeded() {
if (mCheckableChild == null) {
return;
}
setStateDescription(mCheckableChild.getStateDescription());
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public void toggle() {
setChecked(!mChecked);
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setChecked(mChecked);
}
@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setChecked(mChecked);
}
}
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