Fix bug 6886990: cling accessibility

Clings should block interaction with elements
below when Talkback is enabled

Change-Id: Ifdcd109351fd3c2d6dc97ad75ea3ab6eea48b582

2 files changed, 132 insertions, 2 deletions

diff --git a/src/com/android/launcher2/HideFromAccessibilityHelper.java b/src/com/android/launcher2/HideFromAccessibilityHelper.java
new file mode 100644
index 000000000..0b2ce5ba6
--- /dev/null
+++ b/src/com/android/launcher2/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.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)));
+    }
+}
\ No newline at end of file
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index fedf32460..64e382a7b 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -300,6 +300,9 @@ public final class Launcher extends Activity
 
     private BubbleTextView mWaitingForResume;
 
+    private HideFromAccessibilityHelper mHideFromAccessibilityHelper
+        = new HideFromAccessibilityHelper();
+
     private Runnable mBuildLayersRunnable = new Runnable() {
         public void run() {
             if (mWorkspace != null) {
@@ -3662,8 +3665,9 @@ public final class Launcher extends Activity
 
         return true;
     }
+
     private Cling initCling(int clingId, int[] positionData, boolean animate, int delay) {
-        Cling cling = (Cling) findViewById(clingId);
+        final Cling cling = (Cling) findViewById(clingId);
         if (cling != null) {
             cling.init(this, positionData);
             cling.setVisibility(View.VISIBLE);
@@ -3680,11 +3684,21 @@ public final class Launcher extends Activity
             } else {
                 cling.setAlpha(1f);
             }
+            cling.setFocusableInTouchMode(true);
+            cling.post(new Runnable() {
+                public void run() {
+                    cling.setFocusable(true);
+                    cling.requestFocus();
+                }
+            });
+            mHideFromAccessibilityHelper.setImportantForAccessibilityToNo(
+                    mDragLayer, clingId == R.id.all_apps_cling);
         }
         return cling;
     }
+
     private void dismissCling(final Cling cling, final String flag, int duration) {
-        if (cling != null) {
+        if (cling != null && cling.getVisibility() == View.VISIBLE) {
             ObjectAnimator anim = LauncherAnimUtils.ofFloat(cling, "alpha", 0f);
             anim.setDuration(duration);
             anim.addListener(new AnimatorListenerAdapter() {
@@ -3702,8 +3716,10 @@ public final class Launcher extends Activity
                 };
             });
             anim.start();
+            mHideFromAccessibilityHelper.restoreImportantForAccessibility(mDragLayer);
         }
     }
+
     private void removeCling(int id) {
         final View cling = findViewById(id);
         if (cling != null) {
@@ -3714,6 +3730,7 @@ public final class Launcher extends Activity
                     parent.removeView(cling);
                 }
             });
+            mHideFromAccessibilityHelper.restoreImportantForAccessibility(mDragLayer);
         }
     }