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// 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.
// 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_MODELS_ACCELERATOR_H_
#define UI_BASE_MODELS_ACCELERATOR_H_
#pragma once
#include "base/string16.h"
#include "ui/base/keycodes/keyboard_codes.h"
#include "ui/base/events.h"
#include "ui/base/ui_export.h"
namespace ui {
// This is a cross-platform base class for accelerator keys used in menus. It is
// meant to be subclassed for concrete toolkit implementations.
class UI_EXPORT Accelerator {
public:
Accelerator() : key_code_(ui::VKEY_UNKNOWN), modifiers_(0) {}
Accelerator(ui::KeyboardCode keycode, int modifiers)
: key_code_(keycode),
modifiers_(modifiers) {}
Accelerator(const Accelerator& accelerator) {
key_code_ = accelerator.key_code_;
modifiers_ = accelerator.modifiers_;
}
Accelerator(ui::KeyboardCode keycode,
bool shift_pressed, bool ctrl_pressed, bool alt_pressed)
: key_code_(keycode),
modifiers_(0) {
if (shift_pressed)
modifiers_ |= ui::EF_SHIFT_DOWN;
if (ctrl_pressed)
modifiers_ |= ui::EF_CONTROL_DOWN;
if (alt_pressed)
modifiers_ |= ui::EF_ALT_DOWN;
}
virtual ~Accelerator() {}
Accelerator& operator=(const Accelerator& accelerator) {
if (this != &accelerator) {
key_code_ = accelerator.key_code_;
modifiers_ = accelerator.modifiers_;
}
return *this;
}
// We define the < operator so that the KeyboardShortcut can be used as a key
// in a std::map.
bool operator <(const Accelerator& rhs) const {
if (key_code_ != rhs.key_code_)
return key_code_ < rhs.key_code_;
return modifiers_ < rhs.modifiers_;
}
bool operator ==(const Accelerator& rhs) const {
return (key_code_ == rhs.key_code_) && (modifiers_ == rhs.modifiers_);
}
bool operator !=(const Accelerator& rhs) const {
return !(*this == rhs);
}
ui::KeyboardCode key_code() const { return key_code_; }
int modifiers() const { return modifiers_; }
bool IsShiftDown() const {
return (modifiers_ & ui::EF_SHIFT_DOWN) == ui::EF_SHIFT_DOWN;
}
bool IsCtrlDown() const {
return (modifiers_ & ui::EF_CONTROL_DOWN) == ui::EF_CONTROL_DOWN;
}
bool IsAltDown() const {
return (modifiers_ & ui::EF_ALT_DOWN) == ui::EF_ALT_DOWN;
}
// Returns a string with the localized shortcut if any.
string16 GetShortcutText() const;
protected:
// The keycode (VK_...).
ui::KeyboardCode key_code_;
// The state of the Shift/Ctrl/Alt keys (platform-dependent).
int modifiers_;
};
// An interface that classes that want to register for keyboard accelerators
// should implement.
class UI_EXPORT AcceleratorTarget {
public:
// This method should return true if the accelerator was processed.
virtual bool AcceleratorPressed(const Accelerator& accelerator) = 0;
protected:
virtual ~AcceleratorTarget() {}
};
// Since acclerator 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,
ui::Accelerator* accelerator) = 0;
protected:
virtual ~AcceleratorProvider() {}
};
} // namespace ui
#endif // UI_BASE_MODELS_ACCELERATOR_H_
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