Bug 761102 - focus may be missed when ARIA active-descendant is changed on active composite widget, r=tbsaunde, f=davidb

accessible/src/generic/Accessible.cpp

@@ -2846,7 +2846,21 @@ Accessible::IsWidget() const
 bool
 Accessible::IsActiveWidget() const
 {
-  return FocusMgr()->IsFocused(this);
+  if (FocusMgr()->HasDOMFocus(mContent))
+    return true;
+
+  // If text entry of combobox widget has a focus then the combobox widget is
+  // active.
+  if (mRoleMapEntry && mRoleMapEntry->Is(nsGkAtoms::combobox)) {
+    PRUint32 childCount = ChildCount();
+    for (PRUint32 idx = 0; idx < childCount; idx++) {
+      Accessible* child = mChildren.ElementAt(idx);
+      if (child->Role() == roles::ENTRY)
+        return FocusMgr()->HasDOMFocus(child->GetContent());
+    }
+  }
+
+  return false;
 }
 
 bool

accessible/src/generic/DocAccessible.cpp

@@ -1221,11 +1221,11 @@ DocAccessible::ARIAAttributeChanged(nsIContent* aContent, nsIAtom* aAttribute)
 void
 DocAccessible::ARIAActiveDescendantChanged(nsIContent* aElm)
 {
-  if (FocusMgr()->HasDOMFocus(aElm)) {
+  Accessible* widget = GetAccessible(aElm);
+  if (widget && widget->IsActiveWidget()) {
     nsAutoString id;
     if (aElm->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_activedescendant, id)) {
-      nsIDocument* DOMDoc = aElm->OwnerDoc();
-      dom::Element* activeDescendantElm = DOMDoc->GetElementById(id);
+      dom::Element* activeDescendantElm = aElm->OwnerDoc()->GetElementById(id);
       if (activeDescendantElm) {
         Accessible* activeDescendant = GetAccessible(activeDescendantElm);
         if (activeDescendant) {

accessible/tests/mochitest/events/test_focus_aria_activedescendant.html

@@ -70,6 +70,10 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=429547
 
       gQueue.push(new synthFocus("container", new focusChecker("item1")));
       gQueue.push(new changeARIAActiveDescendant("container", "item2"));
+
+      gQueue.push(new synthFocus("combobox_entry", new focusChecker("combobox_entry")));
+      gQueue.push(new changeARIAActiveDescendant("combobox", "combobox_option2"));
+
       todo(false, "No focus for inserted element, bug 687011");
       //gQueue.push(new insertItemNFocus("container", "item3"));
 
@@ -87,6 +91,11 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=429547
      title="Support aria-activedescendant usage in nsIAccesible::TakeFocus()">
     Mozilla Bug 429547
   </a>
+  <a target="_blank"
+     href="https://bugzilla.mozilla.org/show_bug.cgi?id=761102"
+     title="Focus may be missed when ARIA active-descendant is changed on active composite widget">
+    Mozilla Bug 761102
+  </a>
   <p id="display"></p>
   <div id="content" style="display: none"></div>
   <pre id="test">
@@ -96,5 +105,13 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=429547
     <div role="listitem" id="item1">item1</div>
     <div role="listitem" id="item2">item2</div>
   </div>
+
+  <div role="combobox" id="combobox">
+    <input id="combobox_entry">
+    <ul>
+      <li role="option" id="combobox_option1">option1</li>
+      <li role="option" id="combobox_option2">option2</li>
+    </ul>
+  </div>
 </body>
 </html>