Bug 1706910: Implement AXFrame, accessibilityFrame for VoiceOver r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D113585

accessible/mac/MOXAccessibleBase.h

@@ -78,6 +78,9 @@ inline id<mozAccessible> GetObjectOrRepresentedView(id<mozAccessible> aObject) {
 // override, final
 - (id)accessibilityFocusedUIElement;
 
+// override, final
+- (NSValue*)accessibilityFrame;
+
 // override, final
 - (BOOL)isAccessibilityElement;
 

accessible/mac/MOXAccessibleBase.mm

@@ -384,6 +384,12 @@ mozilla::LogModule* GetMacAccessibilityLog() {
   NS_OBJC_END_TRY_BLOCK_RETURN(nil);
 }
 
+- (NSValue*)accessibilityFrame {
+  NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+  return [self isSelectorSupported:@selector(moxFrame)] ? [self moxFrame] : nil;
+  NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
 - (BOOL)isAccessibilityElement {
   NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
 

accessible/mac/MOXAccessibleProtocol.h

@@ -111,6 +111,9 @@
 // AXWindow
 - (id _Nullable)moxWindow;
 
+// AXFrame
+- (NSValue* _Nullable)moxFrame;
+
 // AXTitleUIElement
 - (id _Nullable)moxTitleUIElement;
 

accessible/mac/mozAccessible.h

@@ -193,6 +193,9 @@ inline mozAccessible* GetNativeFromGeckoAccessible(
 // override
 - (NSNumber*)moxSelected;
 
+// override
+- (NSValue*)moxFrame;
+
 // override
 - (NSString*)moxARIACurrent;
 

accessible/mac/mozAccessible.mm

@@ -354,35 +354,16 @@ static const uint64_t kCacheInitialized = ((uint64_t)0x1) << 63;
 }
 
 - (NSValue*)moxPosition {
-  MOZ_ASSERT(!mGeckoAccessible.IsNull());
+  CGRect frame = [[self moxFrame] rectValue];
 
-  nsIntRect rect = mGeckoAccessible.IsAccessible()
-                       ? mGeckoAccessible.AsAccessible()->Bounds()
-                       : mGeckoAccessible.AsProxy()->Bounds();
-
-  NSScreen* mainView = [[NSScreen screens] objectAtIndex:0];
-  CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(mainView);
-  NSPoint p =
-      NSMakePoint(static_cast<CGFloat>(rect.x) / scaleFactor,
-                  [mainView frame].size.height -
-                      static_cast<CGFloat>(rect.y + rect.height) / scaleFactor);
-
-  return [NSValue valueWithPoint:p];
+  return [NSValue valueWithPoint:NSMakePoint(frame.origin.x, frame.origin.y)];
 }
 
 - (NSValue*)moxSize {
-  MOZ_ASSERT(!mGeckoAccessible.IsNull());
+  CGRect frame = [[self moxFrame] rectValue];
 
-  nsIntRect rect = mGeckoAccessible.IsAccessible()
-                       ? mGeckoAccessible.AsAccessible()->Bounds()
-                       : mGeckoAccessible.AsProxy()->Bounds();
-
-  CGFloat scaleFactor =
-      nsCocoaUtils::GetBackingScaleFactor([[NSScreen screens] objectAtIndex:0]);
-  return [NSValue
-      valueWithSize:NSMakeSize(
-                        static_cast<CGFloat>(rect.width) / scaleFactor,
-                        static_cast<CGFloat>(rect.height) / scaleFactor)];
+  return
+      [NSValue valueWithSize:NSMakeSize(frame.size.width, frame.size.height)];
 }
 
 - (NSString*)moxRole {
@@ -712,6 +693,25 @@ struct RoleDescrComparator {
   return @NO;
 }
 
+- (NSValue*)moxFrame {
+  MOZ_ASSERT(!mGeckoAccessible.IsNull());
+
+  nsIntRect rect = mGeckoAccessible.IsAccessible()
+                       ? mGeckoAccessible.AsAccessible()->Bounds()
+                       : mGeckoAccessible.AsProxy()->Bounds();
+  NSScreen* mainView = [[NSScreen screens] objectAtIndex:0];
+  CGFloat scaleFactor = nsCocoaUtils::GetBackingScaleFactor(mainView);
+
+  return [NSValue
+      valueWithRect:NSMakeRect(
+                        static_cast<CGFloat>(rect.x) / scaleFactor,
+                        [mainView frame].size.height -
+                            static_cast<CGFloat>(rect.y + rect.height) /
+                                scaleFactor,
+                        static_cast<CGFloat>(rect.width) / scaleFactor,
+                        static_cast<CGFloat>(rect.height) / scaleFactor)];
+}
+
 - (NSString*)moxARIACurrent {
   if (![self stateWithMask:states::CURRENT]) {
     return nil;