Android/frameworks_base
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

View's visibility to the user not checking predecessor alpha.

Browse Source 
1. A view is visible to the user if is attached to a visible window,
   its visibility is VISIBLE, its alpha is not zero, all its
   predecessors have visibility VISIBLE and non zero alpha, the
   view is not fully covered by predecessors and is within the
   screen.

   The function that computes whether a view is visible for
   accessibility purposes was not taking into account the
   predecessors' alpha.

bug:7454355

Change-Id: I7609f4366da260091d68e5b25832498843fd3d0a
This commit is contained in:
Svetoslav Ganov
2012-11-02 16:03:06 -07:00
parent 37238e5a4e
commit 11f19f15ea
1 changed files with 25 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
core/java/android/view/View.java
View File

@@ -5088,24 +5088,35 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
*/
protected boolean isVisibleToUser(Rect boundInView) {
if (mAttachInfo != null) {
// Attached to invisible window means this view is not visible.
if (mAttachInfo.mWindowVisibility != View.VISIBLE) {
return false;
}
// An invisible predecessor or one with alpha zero means
// that this view is not visible to the user.
Object current = this;
while (current instanceof View) {
View view = (View) current;
// We have attach info so this view is attached and there is no
// need to check whether we reach to ViewRootImpl on the way up.
if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) {
return false;
}
current = view.mParent;
}
// Check if the view is entirely covered by its predecessors.
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.
boolean isVisible = mAttachInfo.mWindowVisibility == View.VISIBLE
&& getAlpha() > 0
&& isShown()
&& getGlobalVisibleRect(visibleRect, offset);
if (isVisible && boundInView != null) {
visibleRect.offset(-offset.x, -offset.y);
// isVisible is always true here, use a simple assignment
isVisible = boundInView.intersect(visibleRect);
if (!getGlobalVisibleRect(visibleRect, offset)) {
return false;
}
return isVisible;
// Check if the visible portion intersects the rectangle of interest.
if (boundInView != null) {
visibleRect.offset(-offset.x, -offset.y);
return boundInView.intersect(visibleRect);
}
return true;
}
return false;
}