1 files changed, 113 insertions, 0 deletions
diff --git a/src/com/android/launcher3/HideFromAccessibilityHelper.java b/src/com/android/launcher3/HideFromAccessibilityHelper.java
new file mode 100644
index 000000000..33adf773c
--- /dev/null
+++ b/src/com/android/launcher3/HideFromAccessibilityHelper.java
@@ -0,0 +1,113 @@
+/*
+ * 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.launcher3;
+
+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)));
+    }
+}
+\ No newline at end of file