Bug 1672243 - Introduce AXIndexForChildUIElement and implement AXTopLevelUIElement. r=MarcoZ

AXTopLevelUIElement is not really testable because it doesn't give a useful result in
headless mode. Since it is a clone of AXWindow, this shouldn't be much of an issue.

Differential Revision: https://phabricator.services.mozilla.com/D94154

accessible/mac/MOXAccessibleBase.h

@@ -114,6 +114,12 @@ inline id<mozAccessible> GetObjectOrRepresentedView(id<mozAccessible> aObject) {
 // override
 - (id<mozAccessible>)moxParent;
 
+// override
+- (NSNumber*)moxIndexForChildUIElement:(id)child;
+
+// override
+- (id)moxTopLevelUIElement;
+
 // override
 - (id<MOXTextMarkerSupport>)moxTextMarkerDelegate;
 

accessible/mac/MOXAccessibleBase.mm

@@ -398,6 +398,14 @@ mozilla::LogModule* GetMacAccessibilityLog() {
 
 #pragma mark - MOXAccessible protocol
 
+- (NSNumber*)moxIndexForChildUIElement:(id)child {
+  return @([[self moxUnignoredChildren] indexOfObject:child]);
+}
+
+- (id)moxTopLevelUIElement {
+  return [self moxWindow];
+}
+
 - (id)moxHitTest:(NSPoint)point {
   return GetObjectOrRepresentedView(self);
 }

accessible/mac/MOXAccessibleProtocol.h

@@ -345,6 +345,9 @@
 // AXCellForColumnAndRow
 - (id _Nullable)moxCellForColumnAndRow:(NSArray* _Nonnull)columnAndRow;
 
+// AXIndexForChildUIElement
+- (NSNumber* _Nullable)moxIndexForChildUIElement:(id _Nonnull)child;
+
 @end
 
 // This protocol maps text marker and text marker range parameters to

accessible/tests/browser/mac/browser.ini

@@ -37,3 +37,4 @@ skip-if = os == 'mac' && debug # Bug 1664577
 [browser_rootgroup.js]
 [browser_text_selection.js]
 [browser_navigate.js]
+[browser_hierarchy.js]

accessible/tests/browser/mac/browser_hierarchy.js

@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Test AXIndexForChildUIElement
+ */
+addAccessibleTask(
+  `<p id="p">Hello <a href="#" id="link">strange</a> world`,
+  (browser, accDoc) => {
+    let p = getNativeInterface(accDoc, "p");
+
+    let children = p.getAttributeValue("AXChildren");
+    is(children.length, 3, "p has 3 children");
+    is(
+      children[1].getAttributeValue("AXDOMIdentifier"),
+      "link",
+      "second child is link"
+    );
+
+    let index = p.getParameterizedAttributeValue(
+      "AXIndexForChildUIElement",
+      children[1]
+    );
+    is(index, 1, "link is second child");
+  }
+);