accessibility bug fix in NumberPicker

* moved View#isVisibleToUser to protected with @hide
* added a new View#isVisibleToUser(Rect), so that a portion of
  the view can be tested for visibility
* NumberPicker will report its concrete class name
* code to append virtual children was at wrong place
* boundInScreen for increment and decrement buttons are reported
  wrong

Change-Id: Ic5d644b3e1efa15b1f0537907c8cdd4ce43a97c1

Author: guang-google

core/java/android/view/View.java

@@ -666,7 +666,7 @@ public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Cal
     protected static final String VIEW_LOG_TAG = "View";
 
     /**
-     * When set to true, apps will draw debugging information about their layouts. 
+     * When set to true, apps will draw debugging information about their layouts.
      *
      * @hide
      */
@@ -4801,17 +4801,46 @@ void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
      * entirely by its predecessors, and has an alpha greater than zero.
      *
      * @return Whether the view is visible on the screen.
+     *
+     * @hide
      */
-    private boolean isVisibleToUser() {
+    protected boolean isVisibleToUser() {
+        return isVisibleToUser(null);
+    }
+
+    /**
+     * Computes whether the given portion of this view is visible to the user. Such a view is
+     * attached, visible, all its predecessors are visible, has an alpha greater than zero, and
+     * the specified portion is not clipped entirely by its predecessors.
+     *
+     * @param boundInView the portion of the view to test; coordinates should be relative; may be
+     *                    <code>null</code>, and the entire view will be tested in this case.
+     *                    When <code>true</code> is returned by the function, the actual visible
+     *                    region will be stored in this parameter; that is, if boundInView is fully
+     *                    contained within the view, no modification will be made, otherwise regions
+     *                    outside of the visible area of the view will be clipped.
+     *
+     * @return Whether the specified portion of the view is visible on the screen.
+     *
+     * @hide
+     */
+    protected boolean isVisibleToUser(Rect boundInView) {
+        Rect visibleRect = mAttachInfo.mTmpInvalRect;
+        Point offset = mAttachInfo.mPoint;
         // The first two checks are made also made by isShown() which
         // however traverses the tree up to the parent to catch that.
         // Therefore, we do some fail fast check to minimize the up
         // tree traversal.
-        return (mAttachInfo != null
-                && mAttachInfo.mWindowVisibility == View.VISIBLE
-                && getAlpha() > 0
-                && isShown()
-                && getGlobalVisibleRect(mAttachInfo.mTmpInvalRect));
+        boolean isVisible = mAttachInfo != null
+            && mAttachInfo.mWindowVisibility == View.VISIBLE
+            && getAlpha() > 0
+            && isShown()
+            && getGlobalVisibleRect(visibleRect, offset);
+            if (isVisible && boundInView != null) {
+                visibleRect.offset(-offset.x, -offset.y);
+                isVisible &= boundInView.intersect(visibleRect);
+            }
+            return isVisible;
     }
 
     /**

core/java/android/widget/NumberPicker.java

@@ -2239,20 +2239,17 @@ private AccessibilityNodeInfo createAccessibilityNodeInfoForVirtualButton(int vi
             info.setPackageName(mContext.getPackageName());
             info.setSource(NumberPicker.this, virtualViewId);
             info.setParent(NumberPicker.this);
-            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_DECREMENT);
-            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INPUT);
-            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INCREMENT);
             info.setText(text);
             info.setClickable(true);
             info.setLongClickable(true);
             info.setEnabled(NumberPicker.this.isEnabled());
             Rect boundsInParent = mTempRect;
             boundsInParent.set(left, top, right, bottom);
+            info.setVisibleToUser(isVisibleToUser(boundsInParent));
             info.setBoundsInParent(boundsInParent);
             Rect boundsInScreen = boundsInParent;
             int[] locationOnScreen = mTempArray;
             getLocationOnScreen(locationOnScreen);
-            boundsInScreen.offsetTo(0, 0);
             boundsInScreen.offset(locationOnScreen[0], locationOnScreen[1]);
             info.setBoundsInScreen(boundsInScreen);
             return info;
@@ -2261,19 +2258,22 @@ private AccessibilityNodeInfo createAccessibilityNodeInfoForVirtualButton(int vi
         private AccessibilityNodeInfo createAccessibilityNodeInfoForNumberPicker(int left, int top,
                 int right, int bottom) {
             AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain();
-            info.setClassName(Button.class.getName());
+            info.setClassName(NumberPicker.class.getName());
             info.setPackageName(mContext.getPackageName());
             info.setSource(NumberPicker.this);
+            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_DECREMENT);
+            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INPUT);
+            info.addChild(NumberPicker.this, VIRTUAL_VIEW_ID_INCREMENT);
             info.setParent((View) getParent());
             info.setEnabled(NumberPicker.this.isEnabled());
             info.setScrollable(true);
             Rect boundsInParent = mTempRect;
             boundsInParent.set(left, top, right, bottom);
             info.setBoundsInParent(boundsInParent);
+            info.setVisibleToUser(isVisibleToUser());
             Rect boundsInScreen = boundsInParent;
             int[] locationOnScreen = mTempArray;
             getLocationOnScreen(locationOnScreen);
-            boundsInScreen.offsetTo(0, 0);
             boundsInScreen.offset(locationOnScreen[0], locationOnScreen[1]);
             info.setBoundsInScreen(boundsInScreen);
             return info;