Turn Bookmark Menus Async

ui/views/controls/menu/activation_change_observer_impl.cc

+// Copyright 2016 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/controls/menu/activation_change_observer_impl.h"
+
+#include "ui/aura/window.h"
+#include "ui/views/controls/menu/menu_controller.h"
+#include "ui/views/widget/widget.h"
+#include "ui/wm/public/activation_client.h"
+
+namespace views {
+
+namespace {
+
+aura::Window* GetOwnerRootWindow(views::Widget* owner) {
+  return owner ? owner->GetNativeWindow()->GetRootWindow() : nullptr;
+}
+
+}  // namespace
+
+ActivationChangeObserverImpl::ActivationChangeObserverImpl(
+    MenuController* controller,
+    Widget* owner)
+    : controller_(controller), root_(GetOwnerRootWindow(owner)) {
+  aura::client::GetActivationClient(root_)->AddObserver(this);
+  root_->AddObserver(this);
+  root_->AddPreTargetHandler(this);
+}
+
+ActivationChangeObserverImpl::~ActivationChangeObserverImpl() {
+  Cleanup();
+}
+
+void ActivationChangeObserverImpl::OnWindowActivated(
+    aura::client::ActivationChangeObserver::ActivationReason reason,
+    aura::Window* gained_active,
+    aura::Window* lost_active) {
+  if (!controller_->drag_in_progress())
+    controller_->CancelAll();
+}
+
+void ActivationChangeObserverImpl::OnWindowDestroying(aura::Window* window) {
+  Cleanup();
+}
+
+void ActivationChangeObserverImpl::OnCancelMode(ui::CancelModeEvent* event) {
+  controller_->CancelAll();
+}
+
+void ActivationChangeObserverImpl::Cleanup() {
+  if (!root_)
+    return;
+  // The ActivationClient may have been destroyed by the time we get here.
+  aura::client::ActivationClient* client =
+      aura::client::GetActivationClient(root_);
+  if (client)
+    client->RemoveObserver(this);
+  root_->RemovePreTargetHandler(this);
+  root_->RemoveObserver(this);
+  root_ = nullptr;
+}
+
+}  // namespace views