Disables showing tooltips while a system menu is showing on windows

ui/aura/client/scoped_tooltip_disabler.cc

+// Copyright (c) 2014 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/aura/client/scoped_tooltip_disabler.h"
+
+#include "ui/aura/client/tooltip_client.h"
+#include "ui/aura/window.h"
+
+namespace aura {
+namespace client {
+
+ScopedTooltipDisabler::ScopedTooltipDisabler(aura::Window* window)
+    : root_(window ? window->GetRootWindow() : NULL) {
+  if (root_) {
+    root_->AddObserver(this);
+    TooltipClient* client = GetTooltipClient(root_);
+    if (client)
+      client->SetTooltipsEnabled(false);
+  }
+}
+
+ScopedTooltipDisabler::~ScopedTooltipDisabler() {
+  EnableTooltips();
+}
+
+void ScopedTooltipDisabler::EnableTooltips() {
+  if (!root_)
+    return;
+  TooltipClient* client = GetTooltipClient(root_);
+  if (client)
+    client->SetTooltipsEnabled(true);
+  root_->RemoveObserver(this);
+  root_ = NULL;
+}
+
+void ScopedTooltipDisabler::OnWindowDestroying(aura::Window* window) {
+  EnableTooltips();
+}
+
+
+}  // namespace client
+}  // namespace aura