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/*
* Copyright (C) 2012 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.launcher2;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.OnHierarchyChangeListener;
import java.util.HashMap;
public class HideFromAccessibilityHelper implements OnHierarchyChangeListener {
private HashMap<View, Integer> mPreviousValues;
boolean mHide;
boolean mOnlyAllApps;
public HideFromAccessibilityHelper() {
mPreviousValues = new HashMap<View, Integer>();
mHide = false;
}
public void setImportantForAccessibilityToNo(View v, boolean onlyAllApps) {
mOnlyAllApps = onlyAllApps;
setImportantForAccessibilityToNoHelper(v);
mHide = true;
}
private void setImportantForAccessibilityToNoHelper(View v) {
mPreviousValues.put(v, v.getImportantForAccessibility());
v.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);
// Call method on children recursively
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
vg.setOnHierarchyChangeListener(this);
for (int i = 0; i < vg.getChildCount(); i++) {
View child = vg.getChildAt(i);
if (includeView(child)) {
setImportantForAccessibilityToNoHelper(child);
}
}
}
}
public void restoreImportantForAccessibility(View v) {
if (mHide) {
restoreImportantForAccessibilityHelper(v);
}
mHide = false;
}
private void restoreImportantForAccessibilityHelper(View v) {
v.setImportantForAccessibility(mPreviousValues.get(v));
mPreviousValues.remove(v);
// Call method on children recursively
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
// We assume if a class implements OnHierarchyChangeListener, it listens
// to changes to any of its children (happens to be the case in Launcher)
if (vg instanceof OnHierarchyChangeListener) {
vg.setOnHierarchyChangeListener((OnHierarchyChangeListener) vg);
} else {
vg.setOnHierarchyChangeListener(null);
}
for (int i = 0; i < vg.getChildCount(); i++) {
View child = vg.getChildAt(i);
if (includeView(child)) {
restoreImportantForAccessibilityHelper(child);
}
}
}
}
public void onChildViewAdded(View parent, View child) {
if (mHide && includeView(child)) {
setImportantForAccessibilityToNoHelper(child);
}
}
public void onChildViewRemoved(View parent, View child) {
if (mHide && includeView(child)) {
restoreImportantForAccessibilityHelper(child);
}
}
private boolean includeView(View v) {
return !hasAncestorOfType(v, Cling.class) &&
(!mOnlyAllApps || hasAncestorOfType(v, AppsCustomizeTabHost.class));
}
private boolean hasAncestorOfType(View v, Class c) {
return v != null &&
(v.getClass().equals(c) ||
(v.getParent() instanceof ViewGroup &&
hasAncestorOfType((ViewGroup) v.getParent(), c)));
}
}
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