Bug 1680589: Make AXDisclosing settable on outline rows r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D101053

accessible/mac/MOXAccessibleProtocol.h

@@ -307,6 +307,9 @@
 
 #pragma mark - AttributeSetters
 
+// AXDisclosing
+- (void)moxSetDisclosing:(NSNumber* _Nullable)disclosing;
+
 // AXValue
 - (void)moxSetValue:(id _Nullable)value;
 

accessible/mac/mozTableAccessible.h

@@ -138,6 +138,9 @@
 // override
 - (NSNumber*)moxDisclosing;
 
+// override
+- (void)moxSetDisclosing:(NSNumber*)disclosing;
+
 // override
 - (NSNumber*)moxExpanded;
 

accessible/mac/mozTableAccessible.mm

@@ -461,6 +461,14 @@ using namespace mozilla::a11y;
   return @([self stateWithMask:states::EXPANDED] != 0);
 }
 
+- (void)moxSetDisclosing:(NSNumber*)disclosing {
+  // VoiceOver requires this to be settable, but doesn't
+  // require it actually affect our disclosing state.
+  // We expose the attr as settable with this method
+  // but do nothing to actually set it.
+  return;
+}
+
 - (NSNumber*)moxExpanded {
   return @([self stateWithMask:states::EXPANDED] != 0);
 }

accessible/tests/browser/mac/browser_outline.js

@@ -402,3 +402,32 @@ addAccessibleTask(
     );
   }
 );
+
+// Test outline registers AXDisclosed attr as settable
+addAccessibleTask(
+  `
+  <div role="tree" id="tree" tabindex="0" aria-label="My drive" aria-activedescendant="myfiles">
+    <div id="myfiles" role="treeitem" aria-label="My files" aria-selected="true" aria-expanded="false">My files</div>
+    <div role="treeitem" aria-label="Shared items" aria-selected="false" aria-expanded="true">Shared items</div>
+  </div>
+  `,
+  async (browser, accDoc) => {
+    const tree = getNativeInterface(accDoc, "tree");
+    const treeItems = tree.getAttributeValue("AXChildren");
+
+    is(treeItems.length, 2, "Outline has two direct children");
+    is(treeItems[0].getAttributeValue("AXDisclosing"), 0);
+    is(treeItems[1].getAttributeValue("AXDisclosing"), 1);
+
+    is(treeItems[0].isAttributeSettable("AXDisclosing"), true);
+    is(treeItems[1].isAttributeSettable("AXDisclosing"), true);
+
+    // attempt to change attribute values
+    treeItems[0].setAttributeValue("AXDisclosing", 1);
+    treeItems[0].setAttributeValue("AXDisclosing", 0);
+
+    // verify they're unchanged
+    is(treeItems[0].getAttributeValue("AXDisclosing"), 0);
+    is(treeItems[1].getAttributeValue("AXDisclosing"), 1);
+  }
+);