Add ShellAcceleratorController that manages global keyboard accelerators (2nd try).

ui/aura_shell/shell_accelerator_controller.h

+// Copyright (c) 2011 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.
+
+#ifndef UI_AURA_SHELL_SHELL_ACCELERATOR_CONTROLLER_H_
+#define UI_AURA_SHELL_SHELL_ACCELERATOR_CONTROLLER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura_shell/aura_shell_export.h"
+#include "ui/base/models/accelerator.h"
+
+namespace ui {
+class AcceleratorManager;
+}  // namespace ui
+
+namespace aura_shell {
+
+// ShellAcceleratorController provides functions for registering or
+// unregistering global keyboard accelerators, which are handled earlier than
+// any windows. It also implements several handlers as an accelerator target.
+class AURA_SHELL_EXPORT ShellAcceleratorController
+    : public ui::AcceleratorTarget {
+ public:
+  ShellAcceleratorController();
+  virtual ~ShellAcceleratorController();
+
+  // Register a global keyboard accelerator for the specified target. If
+  // multiple targets are registered for an accelerator, a target registered
+  // later has higher priority.
+  void Register(const ui::Accelerator& accelerator,
+                ui::AcceleratorTarget* target);
+
+  // Unregister the specified keyboard accelerator for the specified target.
+  void Unregister(const ui::Accelerator& accelerator,
+                  ui::AcceleratorTarget* target);
+
+  // Unregister all keyboard accelerators for the specified target.
+  void UnregisterAll(ui::AcceleratorTarget* target);
+
+  // Activate the target associated with the specified accelerator.
+  // First, AcceleratorPressed handler of the most recently registered target
+  // is called, and if that handler processes the event (i.e. returns true),
+  // this method immediately returns. If not, we do the same thing on the next
+  // target, and so on.
+  // Returns true if an accelerator was activated.
+  bool Process(const ui::Accelerator& accelerator);
+
+  // Overridden from ui::AcceleratorTarget:
+  virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
+
+ private:
+  scoped_ptr<ui::AcceleratorManager> accelerator_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShellAcceleratorController);
+};
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_SHELL_ACCELERATOR_CONTROLLER_H_