Re-land: Implement NativeViewAccessibilityWin using AXPlatformNodeWin.

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 "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_view_state.h"
+#include "ui/events/event_utils.h"
+#include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
 #if !defined(OS_WIN)
 // static
 NativeViewAccessibility* NativeViewAccessibility::Create(View* view) {
-  DCHECK(view);
-  NativeViewAccessibility* instance = new NativeViewAccessibility();
-  instance->set_view(view);
-  return instance;
+  return new NativeViewAccessibility(view);
 }
 #endif
 
-NativeViewAccessibility::NativeViewAccessibility()
-    : view_(NULL), ax_node_(ui::AXPlatformNode::Create(this)) {
+NativeViewAccessibility::NativeViewAccessibility(View* view)
+    : view_(view),
+      parent_widget_(nullptr),
+      ax_node_(ui::AXPlatformNode::Create(this)) {
 }
 
 NativeViewAccessibility::~NativeViewAccessibility() {
   if (ax_node_)
     ax_node_->Destroy();
+  if (parent_widget_)
+    parent_widget_->RemoveObserver(this);
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::GetNativeObject() {
-  return ax_node_ ? ax_node_->GetNativeViewAccessible() : NULL;
+  return ax_node_ ? ax_node_->GetNativeViewAccessible() : nullptr;
 }
 
 void NativeViewAccessibility::Destroy() {
   delete this;
 }
 
-#if !defined(OS_WIN)
-// static
-void NativeViewAccessibility::RegisterWebView(View* web_view) {
-}
-
-// static
-void NativeViewAccessibility::UnregisterWebView(View* web_view) {
-}
-#endif
+void NativeViewAccessibility::NotifyAccessibilityEvent(ui::AXEvent event_type) {
+  if (ax_node_)
+    ax_node_->NotifyAccessibilityEvent(event_type);
+}
 
 // ui::AXPlatformNodeDelegate
 
-ui::AXNodeData* NativeViewAccessibility::GetData() {
+const ui::AXNodeData& NativeViewAccessibility::GetData() {
   ui::AXViewState state;
   view_->GetAccessibleState(&state);
+  data_ = ui::AXNodeData();
   data_.role = state.role;
+  data_.state = state.state();
   data_.location = view_->GetBoundsInScreen();
-  return &data_;
+  data_.AddStringAttribute(ui::AX_ATTR_NAME, base::UTF16ToUTF8(state.name));
+  data_.AddStringAttribute(ui::AX_ATTR_VALUE, base::UTF16ToUTF8(state.value));
+  data_.AddStringAttribute(ui::AX_ATTR_ACTION,
+                           base::UTF16ToUTF8(state.default_action));
+  data_.AddStringAttribute(ui::AX_ATTR_SHORTCUT,
+                           base::UTF16ToUTF8(state.keyboard_shortcut));
+  data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, state.selection_start);
+  data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, state.selection_end);
+
+  data_.state |= (1 << ui::AX_STATE_FOCUSABLE);
+
+  if (!view_->enabled())
+    data_.state |= (1 << ui::AX_STATE_DISABLED);
+
+  if (!view_->visible())
+    data_.state |= (1 << ui::AX_STATE_INVISIBLE);
+
+  if (view_->HasFocus())
+    data_.state |= (1 << ui::AX_STATE_FOCUSED);
+
+  return data_;
 }
 
 int NativeViewAccessibility::GetChildCount() {
-  return view_->child_count();
+  int child_count = view_->child_count();
+
+  std::vector<Widget*> child_widgets;
+  PopulateChildWidgetVector(&child_widgets);
+  child_count += child_widgets.size();
+
+  return child_count;
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::ChildAtIndex(int index) {
-  if (index < 0 || index >= view_->child_count())
-    return NULL;
-  return view_->child_at(index)->GetNativeViewAccessible();
+  // If this is a root view, our widget might have child widgets. Include
+  std::vector<Widget*> child_widgets;
+  PopulateChildWidgetVector(&child_widgets);
+  int child_widget_count = static_cast<int>(child_widgets.size());
+
+  if (index < view_->child_count()) {
+    return view_->child_at(index)->GetNativeViewAccessible();
+  } else if (index < view_->child_count() + child_widget_count) {
+    Widget* child_widget = child_widgets[index - view_->child_count()];
+    return child_widget->GetRootView()->GetNativeViewAccessible();
+  }
+
+  return nullptr;
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::GetParent() {
   if (view_->parent())
     return view_->parent()->GetNativeViewAccessible();
 
+  // TODO: move this to NativeViewAccessibilityMac.
 #if defined(OS_MACOSX)
   if (view_->GetWidget())
     return view_->GetWidget()->GetNativeView();
 #endif
 
-  return NULL;
+  if (parent_widget_)
+    return parent_widget_->GetRootView()->GetNativeViewAccessible();
+
+  return nullptr;
 }
 
 gfx::Vector2d NativeViewAccessibility::GetGlobalCoordinateOffset() {
   return gfx::Vector2d(0, 0);  // location is already in screen coordinates.
 }
 
-void NativeViewAccessibility::NotifyAccessibilityEvent(ui::AXEvent event_type) {
+gfx::NativeViewAccessible NativeViewAccessibility::HitTestSync(int x, int y) {
+  if (!view_ || !view_->GetWidget())
+    return nullptr;
+
+  // Search child widgets first, since they're on top in the z-order.
+  std::vector<Widget*> child_widgets;
+  PopulateChildWidgetVector(&child_widgets);
+  for (Widget* child_widget : child_widgets) {
+    View* child_root_view = child_widget->GetRootView();
+    gfx::Point point(x, y);
+    View::ConvertPointFromScreen(child_root_view, &point);
+    if (child_root_view->HitTestPoint(point))
+      return child_root_view->GetNativeViewAccessible();
+  }
+
+  gfx::Point point(x, y);
+  View::ConvertPointFromScreen(view_, &point);
+  if (!view_->HitTestPoint(point))
+    return nullptr;
+
+  // Check if the point is within any of the immediate children of this
+  // view. We don't have to search further because AXPlatformNode will
+  // do a recursive hit test if we return anything other than |this| or NULL.
+  for (int i = view_->child_count() - 1; i >= 0; --i) {
+    View* child_view = view_->child_at(i);
+    if (!child_view->visible())
+      continue;
+
+    gfx::Point point_in_child_coords(point);
+    view_->ConvertPointToTarget(view_, child_view, &point_in_child_coords);
+    if (child_view->HitTestPoint(point_in_child_coords))
+      return child_view->GetNativeViewAccessible();
+  }
+
+  // If it's not inside any of our children, it's inside this view.
+  return GetNativeObject();
+}
+
+gfx::NativeViewAccessible NativeViewAccessibility::GetFocus() {
+  FocusManager* focus_manager = view_->GetFocusManager();
+  View* focused_view =
+      focus_manager ? focus_manager->GetFocusedView() : nullptr;
+  return focused_view ? focused_view->GetNativeViewAccessible() : nullptr;
+}
+
+gfx::AcceleratedWidget
+NativeViewAccessibility::GetTargetForNativeAccessibilityEvent() {
+  return gfx::kNullAcceleratedWidget;
+}
+
+void NativeViewAccessibility::DoDefaultAction() {
+  gfx::Point center = view_->GetLocalBounds().CenterPoint();
+  view_->OnMousePressed(ui::MouseEvent(ui::ET_MOUSE_PRESSED,
+                                       center,
+                                       center,
+                                       ui::EventTimeForNow(),
+                                       ui::EF_LEFT_MOUSE_BUTTON,
+                                       ui::EF_LEFT_MOUSE_BUTTON));
+  view_->OnMouseReleased(ui::MouseEvent(ui::ET_MOUSE_RELEASED,
+                                        center,
+                                        center,
+                                        ui::EventTimeForNow(),
+                                        ui::EF_LEFT_MOUSE_BUTTON,
+                                        ui::EF_LEFT_MOUSE_BUTTON));
+}
+
+bool NativeViewAccessibility::SetStringValue(const base::string16& new_value) {
+  // Return an error if the view can't set the value.
+  ui::AXViewState state;
+  view_->GetAccessibleState(&state);
+  if (state.set_value_callback.is_null())
+    return false;
+
+  state.set_value_callback.Run(new_value);
+  return true;
+}
+
+void NativeViewAccessibility::OnWidgetDestroying(Widget* widget) {
+  if (parent_widget_ == widget)
+    parent_widget_ = nullptr;
+}
+
+void NativeViewAccessibility::SetParentWidget(Widget* parent_widget) {
+  if (parent_widget_)
+    parent_widget_->RemoveObserver(this);
+  parent_widget_ = parent_widget;
+  parent_widget_->AddObserver(this);
+}
+
+void NativeViewAccessibility::PopulateChildWidgetVector(
+    std::vector<Widget*>* result_child_widgets) {
+  // Only attach child widgets to the root view.
+  Widget* widget = view_->GetWidget();
+  if (!widget || widget->GetRootView() != view_)
+    return;
+
+  std::set<Widget*> child_widgets;
+  Widget::GetAllOwnedWidgets(widget->GetNativeView(), &child_widgets);
+  for (auto iter = child_widgets.begin(); iter != child_widgets.end(); ++iter) {
+    Widget* child_widget = *iter;
+    DCHECK_NE(widget, child_widget);
+
+    if (!child_widget->IsVisible())
+      continue;
+
+    if (widget->GetNativeWindowProperty(kWidgetNativeViewHostKey))
+      continue;
+
+    gfx::NativeViewAccessible child_widget_accessible =
+        child_widget->GetRootView()->GetNativeViewAccessible();
+    ui::AXPlatformNode* child_widget_platform_node =
+        ui::AXPlatformNode::FromNativeViewAccessible(child_widget_accessible);
+    if (child_widget_platform_node) {
+      NativeViewAccessibility* child_widget_view_accessibility =
+          static_cast<NativeViewAccessibility*>(
+              child_widget_platform_node->GetDelegate());
+      if (child_widget_view_accessibility->parent_widget() != widget)
+        child_widget_view_accessibility->SetParentWidget(widget);
+    }
+
+    result_child_widgets->push_back(child_widget);
+  }
 }
 
 }  // namespace views