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// Copyright (c) 2012 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 ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
#define ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
#include <map>
#include <set>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "ash/ash_export.h"
#include "ui/base/accelerators/accelerator.h"
namespace ui {
class AcceleratorManager;
}
namespace ash {
struct AcceleratorData;
class BrightnessControlDelegate;
class CapsLockDelegate;
class ImeControlDelegate;
class KeyboardBrightnessControlDelegate;
class ScreenshotDelegate;
class VolumeControlDelegate;
// AcceleratorController 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 ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
public:
AcceleratorController();
virtual ~AcceleratorController();
// Registers 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);
// Unregisters the specified keyboard accelerator for the specified target.
void Unregister(const ui::Accelerator& accelerator,
ui::AcceleratorTarget* target);
// Unregisters all keyboard accelerators for the specified target.
void UnregisterAll(ui::AcceleratorTarget* target);
// Activates 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);
// Returns true if the |accelerator| is registered.
bool IsRegistered(const ui::Accelerator& accelerator) const;
// Returns true if the |accelerator| is one of the |reserved_actions_|.
bool IsReservedAccelerator(const ui::Accelerator& accelerator) const;
// Performs the specified action. The |accelerator| may provide additional
// data the action needs. Returns whether an action was performed
// successfully.
bool PerformAction(int action,
const ui::Accelerator& accelerator);
// Overridden from ui::AcceleratorTarget:
virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
virtual bool CanHandleAccelerators() const OVERRIDE;
void SetBrightnessControlDelegate(
scoped_ptr<BrightnessControlDelegate> brightness_control_delegate);
void SetCapsLockDelegate(scoped_ptr<CapsLockDelegate> caps_lock_delegate);
void SetImeControlDelegate(
scoped_ptr<ImeControlDelegate> ime_control_delegate);
void SetKeyboardBrightnessControlDelegate(
scoped_ptr<KeyboardBrightnessControlDelegate>
keyboard_brightness_control_delegate);
void SetScreenshotDelegate(
scoped_ptr<ScreenshotDelegate> screenshot_delegate);
void SetVolumeControlDelegate(
scoped_ptr<VolumeControlDelegate> volume_control_delegate);
BrightnessControlDelegate* brightness_control_delegate() const {
return brightness_control_delegate_.get();
}
VolumeControlDelegate* volume_control_delegate() const {
return volume_control_delegate_.get();
}
private:
// Initializes the accelerators this class handles as a target.
void Init();
// Switches to a 0-indexed (in order of creation) window.
// A negative index switches to the last window in the list.
void SwitchToWindow(int window);
// Registers the specified accelerators.
void RegisterAccelerators(const AcceleratorData accelerators[],
size_t accelerators_length);
scoped_ptr<ui::AcceleratorManager> accelerator_manager_;
// TODO(derat): BrightnessControlDelegate is also used by the system tray;
// move it outside of this class.
scoped_ptr<BrightnessControlDelegate> brightness_control_delegate_;
scoped_ptr<CapsLockDelegate> caps_lock_delegate_;
scoped_ptr<ImeControlDelegate> ime_control_delegate_;
scoped_ptr<KeyboardBrightnessControlDelegate>
keyboard_brightness_control_delegate_;
scoped_ptr<ScreenshotDelegate> screenshot_delegate_;
scoped_ptr<VolumeControlDelegate> volume_control_delegate_;
// A map from accelerators to the AcceleratorAction values, which are used in
// the implementation.
std::map<ui::Accelerator, int> accelerators_;
// Actions allowed when the user is not signed in.
std::set<int> actions_allowed_at_login_screen_;
// Actions allowed when the screen is locked.
std::set<int> actions_allowed_at_lock_screen_;
// Reserved actions. See accelerator_table.h for details.
std::set<int> reserved_actions_;
DISALLOW_COPY_AND_ASSIGN(AcceleratorController);
};
} // namespace ash
#endif // ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_