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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.
// This class describe a keyboard accelerator (or keyboard shortcut).
// Keyboard accelerators are registered with the FocusManager.
// It has a copy constructor and assignment operator so that it can be copied.
// It also defines the < operator so that it can be used as a key in a std::map.
//
#ifndef UI_BASE_ACCELERATORS_ACCELERATOR_H_
#define UI_BASE_ACCELERATORS_ACCELERATOR_H_
#include <memory>
#include <utility>
#include "base/component_export.h"
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_codes.h"
namespace ui {
class KeyEvent;
// While |modifiers| may include EF_IS_REPEAT, EF_IS_REPEAT is not considered
// an intrinsic part of an Accelerator. This is done so that an accelerator
// for a particular KeyEvent matches an accelerator with or without the repeat
// flag. A side effect of this is that == (and <) does not consider the
// repeat flag in its comparison.
class COMPONENT_EXPORT(UI_BASE) Accelerator {
public:
enum class KeyState {
PRESSED,
RELEASED,
};
Accelerator();
// |modifiers| consists of ui::EventFlags bitwise-or-ed together,
// for example:
// Accelerator(ui::VKEY_Z, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN)
// would correspond to the shortcut "ctrl + shift + z".
Accelerator(KeyboardCode key_code,
int modifiers,
KeyState key_state = KeyState::PRESSED,
base::TimeTicks time_stamp = base::TimeTicks());
explicit Accelerator(const KeyEvent& key_event);
Accelerator(const Accelerator& accelerator);
Accelerator& operator=(const Accelerator& accelerator);
~Accelerator();
// Masks out all the non-modifiers KeyEvent |flags| and returns only the
// available modifier ones. This does not include EF_IS_REPEAT.
static int MaskOutKeyEventFlags(int flags);
KeyEvent ToKeyEvent() const;
// Define the < operator so that the KeyboardShortcut can be used as a key in
// a std::map.
bool operator <(const Accelerator& rhs) const;
bool operator ==(const Accelerator& rhs) const;
bool operator !=(const Accelerator& rhs) const;
KeyboardCode key_code() const { return key_code_; }
// Sets the key state that triggers the accelerator. Default is PRESSED.
void set_key_state(KeyState state) { key_state_ = state; }
KeyState key_state() const { return key_state_; }
int modifiers() const { return modifiers_; }
base::TimeTicks time_stamp() const { return time_stamp_; }
int source_device_id() const { return source_device_id_; }
bool IsShiftDown() const;
bool IsCtrlDown() const;
bool IsAltDown() const;
bool IsAltGrDown() const;
bool IsCmdDown() const;
bool IsRepeat() const;
// Returns a string with the localized shortcut if any.
base::string16 GetShortcutText() const;
#if defined(OS_APPLE)
base::string16 KeyCodeToMacSymbol() const;
#endif
base::string16 KeyCodeToName() const;
void set_interrupted_by_mouse_event(bool interrupted_by_mouse_event) {
interrupted_by_mouse_event_ = interrupted_by_mouse_event;
}
bool interrupted_by_mouse_event() const {
return interrupted_by_mouse_event_;
}
private:
base::string16 ApplyLongFormModifiers(base::string16 shortcut) const;
base::string16 ApplyShortFormModifiers(base::string16 shortcut) const;
// The keycode (VK_...).
KeyboardCode key_code_;
KeyState key_state_;
// The state of the Shift/Ctrl/Alt keys. This corresponds to Event::flags().
int modifiers_;
// The |time_stamp_| of the KeyEvent.
base::TimeTicks time_stamp_;
// Whether the accelerator is interrupted by a mouse press/release. This is
// optionally used by AcceleratorController. Even this is set to true, the
// accelerator may still be handled successfully. (Currently only
// TOGGLE_APP_LIST and TOGGLE_APP_LIST_FULLSCREEN are disabled when mouse
// press/release occurs between search key down and up. See crbug.com/665897)
bool interrupted_by_mouse_event_;
// The |source_device_id_| of the KeyEvent.
int source_device_id_ = ui::ED_UNKNOWN_DEVICE;
};
// An interface that classes that want to register for keyboard accelerators
// should implement.
class COMPONENT_EXPORT(UI_BASE) AcceleratorTarget {
public:
// Should return true if the accelerator was processed.
virtual bool AcceleratorPressed(const Accelerator& accelerator) = 0;
// Should return true if the target can handle the accelerator events. The
// AcceleratorPressed method is invoked only for targets for which
// CanHandleAccelerators returns true.
virtual bool CanHandleAccelerators() const = 0;
protected:
virtual ~AcceleratorTarget() {}
};
// Since accelerator code is one of the few things that can't be cross platform
// in the chrome UI, separate out just the GetAcceleratorForCommandId() from
// the menu delegates.
class AcceleratorProvider {
public:
// Gets the accelerator for the specified command id. Returns true if the
// command id has a valid accelerator, false otherwise.
virtual bool GetAcceleratorForCommandId(int command_id,
Accelerator* accelerator) const = 0;
protected:
virtual ~AcceleratorProvider() {}
};
} // namespace ui
#endif // UI_BASE_ACCELERATORS_ACCELERATOR_H_