Initial support for native accessibility in ARC

components/exo/shell_surface.cc

 // Copyright 2015 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 "components/exo/shell_surface.h"
 
 #include <algorithm>
 
 #include "ash/common/frame/custom_frame_view_ash.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm/window_state_delegate.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/wm/window_state_aura.h"
 #include "ash/wm/window_util.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/exo/surface.h"
+#include "ui/accessibility/ax_enums.h"
+#include "ui/accessibility/ax_node_data.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_property.h"
 #include "ui/aura/window_targeter.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/path.h"
 #include "ui/views/widget/widget.h"
@@ skipping 744 matching lines @@
     widget_->Hide();
   }
 
   // Note: In its use in the Wayland server implementation, the surface
   // destroyed callback may destroy the ShellSurface instance. This call needs
   // to be last so that the instance can be destroyed.
   if (!surface_destroyed_callback_.is_null())
     surface_destroyed_callback_.Run();
 }
 
+void ShellSurface::OnSurfaceAXTreeChanged(int32_t id) {
+  ax_tree_id_ = id;
+
+  NotifyAccessibilityEvent(ui::AX_EVENT_CHILDREN_CHANGED, false);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // views::WidgetDelegate overrides:
 
 bool ShellSurface::CanResize() const {
   return initial_bounds_.IsEmpty();
 }
 
 bool ShellSurface::CanMaximize() const {
   // Shell surfaces in system modal container cannot be maximized.
   if (container_ == ash::kShellWindowId_SystemModalContainer)
@@ skipping 64 matching lines @@
   if (!geometry_.IsEmpty())
     return geometry_.size();
 
   return surface_ ? surface_->window()->layer()->size() : gfx::Size();
 }
 
 gfx::Size ShellSurface::GetMinimumSize() const {
   return gfx::Size(1, 1);
 }
 
+void ShellSurface::GetAccessibleNodeData(ui::AXNodeData* node_data) {
+  if (ax_tree_id_)
+    node_data->AddIntAttribute(ui::AX_ATTR_CHILD_TREE_ID, ax_tree_id_);
+  node_data->SetName("ExoShell");
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ash::wm::WindowStateObserver overrides:
 
 void ShellSurface::OnPreWindowStateTypeChange(
     ash::wm::WindowState* window_state,
     ash::wm::WindowStateType old_type) {
   ash::wm::WindowStateType new_type = window_state->GetStateType();
   if (ash::wm::IsMaximizedOrFullscreenOrPinnedWindowStateType(old_type) ||
       ash::wm::IsMaximizedOrFullscreenOrPinnedWindowStateType(new_type)) {
     // When transitioning in/out of maximized or fullscreen mode we need to
@@ skipping 619 matching lines @@
     shadow_overlay_->SetBounds(shadow_bounds);
     shadow->SetContentBounds(gfx::Rect(shadow_bounds.size()));
     // Surfaces that can't be activated are usually menus and tooltips. Use a
     // small style shadow for them.
     if (!activatable_)
       shadow->SetElevation(wm::ShadowElevation::SMALL);
   }
 }
 
 }  // namespace exo