Bug 1429940 - Part 1 - Use the first "label" element instead of the one inside "caption" to describe the "groupbox" element. r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D11793

--HG--
extra : rebase_source : eec887ae45eb1a2b1356cef2f6cbbf24a5427f39

accessible/tests/mochitest/name/test_general.xul

@@ -174,7 +174,7 @@
       testName("li_labelledby", "Show an Alert The moment the event starts");
 
       //////////////////////////////////////////////////////////////////////////
-      // groupbox labeling from caption sub tree
+      // groupbox labeling from first label
       testName("groupbox", "Some caption");
 
       SimpleTest.finish();
@@ -348,7 +348,7 @@
 
     <!-- Name from caption sub tree -->
     <groupbox id="groupbox">
-      <caption><label>Some caption</label></caption>
+      <label>Some caption</label>
       <checkbox label="some checkbox label" />
     </groupbox>
   </vbox>

accessible/tests/mochitest/relations/test_general.xul

@@ -103,8 +103,7 @@
       // 'default button' relation
       testRelation("textbox", RELATION_DEFAULT_BUTTON, "submit");
 
-      // 'labelled by'/'label for' relation for xul:goupbox and xul:label of
-      // xul:caption
+      // 'labelled by'/'label for' relation for xul:groupbox and xul:label
       var groupboxAcc = getAccessible("groupbox");
       var labelAcc = groupboxAcc.firstChild;
       testRelation(labelAcc, RELATION_LABEL_FOR, groupboxAcc);
@@ -211,7 +210,7 @@
     <button id="submit" default="true" label="Default"/>
 
     <groupbox id="groupbox">
-      <caption><label id="groupboxlabel" value="caption"/></caption>
+      <label value="caption"/>
     </groupbox>
 
     <tabbox>

accessible/tests/mochitest/tree/test_groupbox.xul

@@ -54,7 +54,7 @@
 
     <vbox flex="1">
       <groupbox id="groupbox">
-        <caption><label value="Some caption"/></caption>
+        <label value="Some caption"/>
         <checkbox label="some checkbox label" />
     </groupbox>
     </vbox>

accessible/xul/XULElementAccessibles.cpp

@@ -89,12 +89,13 @@ Relation
 XULLabelAccessible::RelationByType(RelationType aType) const
 {
   Relation rel = HyperTextAccessibleWrap::RelationByType(aType);
+
+  // The label for xul:groupbox is generated from the first xul:label
   if (aType == RelationType::LABEL_FOR) {
-    // Caption is the label for groupbox
-    nsIContent* parent = mContent->GetFlattenedTreeParent();
-    if (parent && parent->IsXULElement(nsGkAtoms::caption)) {
     Accessible* parent = Parent();
-      if (parent && parent->Role() == roles::GROUPING)
+    if (parent && parent->Role() == roles::GROUPING &&
+        parent->GetContent()->IsXULElement(nsGkAtoms::groupbox) &&
+        parent->GetChildAt(0) == this) {
       rel.AppendTarget(parent);
     }
   }

accessible/xul/XULFormControlAccessible.cpp

@@ -286,26 +286,15 @@ Relation
 XULGroupboxAccessible::RelationByType(RelationType aType) const
 {
   Relation rel = AccessibleWrap::RelationByType(aType);
-  if (aType != RelationType::LABELLED_BY)
-    return rel;
 
-  // The label for xul:groupbox is generated from xul:label that is
-  // inside the anonymous content of the xul:caption.
-  // The xul:label has an accessible object but the xul:caption does not
-  uint32_t childCount = ChildCount();
-  for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
-    Accessible* childAcc = GetChildAt(childIdx);
-    if (childAcc->Role() == roles::LABEL) {
-      // Ensure that it's our label
-      Relation reverseRel = childAcc->RelationByType(RelationType::LABEL_FOR);
-      Accessible* testGroupbox = nullptr;
-      while ((testGroupbox = reverseRel.Next()))
-        if (testGroupbox == this) {
-          // The <label> points back to this groupbox
+  // The label for xul:groupbox is generated from the first xul:label
+  if (aType == RelationType::LABELLED_BY && ChildCount() > 0) {
+    Accessible* childAcc = GetChildAt(0);
+    if (childAcc->Role() == roles::LABEL &&
+        childAcc->GetContent()->IsXULElement(nsGkAtoms::label)) {
       rel.AppendTarget(childAcc);
     }
   }
-  }
 
   return rel;
 }