MacViews: Accessibility bridge

ui/views/accessibility/native_view_accessibility.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/accessibility/native_view_accessibility.h"
 
+#include "ui/accessibility/ax_view_state.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
+
 namespace views {
 
 #if !defined(OS_WIN)
 // static
 NativeViewAccessibility* NativeViewAccessibility::Create(View* view) {
-  return NULL;
+  return new NativeViewAccessibility(view);
 }
 #endif
 
-NativeViewAccessibility::NativeViewAccessibility() {
+NativeViewAccessibility::NativeViewAccessibility(View* view) : view_(view) {
 }
 
 NativeViewAccessibility::~NativeViewAccessibility() {
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::GetNativeObject() {
-  return NULL;
+  if (!ax_node_)
+    ax_node_.reset(ui::AXPlatformNode::Create(this));
+  return ax_node_->GetNativeViewAccessible();
 }
 
 void NativeViewAccessibility::Destroy() {
+  if (ax_node_)
+    ax_node_->Detach();
   delete this;
 }
 
 #if !defined(OS_WIN)
 // static
 void NativeViewAccessibility::RegisterWebView(View* web_view) {
 }
 
 // static
 void NativeViewAccessibility::UnregisterWebView(View* web_view) {
 }
 #endif
 
+// ui::AXPlatformNodeDelegate
+
+ui::AXNodeData* NativeViewAccessibility::GetData() {
+  ui::AXViewState state;
+  view_->GetAccessibleState(&state);
+  data_.role = state.role;
+  data_.location = view_->GetBoundsInScreen();
+  return &data_;
+}
+
+int NativeViewAccessibility::GetChildCount() {
+  return view_->child_count();
+}
+
+gfx::NativeViewAccessible NativeViewAccessibility::ChildAtIndex(int index) {
+  return view_->child_at(index)->GetNativeViewAccessible();

[dmazzoni, 2014/07/29 06:35:15]

Sanity-check this and return NULL if it's out of bounds. Log a warning but
nothing more.

Accessibility calls come from out-of-process, so it's possible that an external
accessibility client queries the number of children, then before they have a
chance to iterate, the number of children changes.

(This can't happen with the current Mac impl since it builds the vector all at
once, but I want to reuse this code for all platforms.)

[Andre, 2014/07/29 21:58:56]

Done.

+}
+
+gfx::NativeViewAccessible NativeViewAccessibility::GetParent() {
+  if (view_->parent())
+    return view_->parent()->GetNativeViewAccessible();
+  else if (view_->GetWidget())
+    return view_->GetWidget()->GetNativeViewAccessible();
+  else
+    return NULL;
+}
+
+gfx::Vector2d NativeViewAccessibility::GetGlobalCoordinateOffset() {
+  return gfx::Vector2d(0, 0);  // location is already in screen coordinates.
+}
+
+void NativeViewAccessibility::NotifyAccessibilityEvent(ui::AXEvent event_type) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace views