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// Copyright (c) 2006-2008 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 VIEWS_ACCELERATOR_H_
#define VIEWS_ACCELERATOR_H_
#include <string>
#include "base/keyboard_codes.h"
#include "views/event.h"
namespace views {
class Accelerator {
public:
Accelerator(base::KeyboardCode keycode,
bool shift_pressed, bool ctrl_pressed, bool alt_pressed)
: key_code_(keycode) {
modifiers_ = 0;
if (shift_pressed)
modifiers_ |= Event::EF_SHIFT_DOWN;
if (ctrl_pressed)
modifiers_ |= Event::EF_CONTROL_DOWN;
if (alt_pressed)
modifiers_ |= Event::EF_ALT_DOWN;
}
Accelerator(const Accelerator& accelerator) {
key_code_ = accelerator.key_code_;
modifiers_ = accelerator.modifiers_;
}
~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);
}
bool IsShiftDown() const {
return (modifiers_ & Event::EF_SHIFT_DOWN) == Event::EF_SHIFT_DOWN;
}
bool IsCtrlDown() const {
return (modifiers_ & Event::EF_CONTROL_DOWN) == Event::EF_CONTROL_DOWN;
}
bool IsAltDown() const {
return (modifiers_ & Event::EF_ALT_DOWN) == Event::EF_ALT_DOWN;
}
base::KeyboardCode GetKeyCode() const {
return key_code_;
}
int modifiers() const {
return modifiers_;
}
// Returns a string with the localized shortcut if any.
std::wstring GetShortcutText() const;
private:
// The window keycode (VK_...).
base::KeyboardCode key_code_;
// The state of the Shift/Ctrl/Alt keys (see event.h).
int modifiers_;
};
// An interface that classes that want to register for keyboard accelerators
// should implement.
class AcceleratorTarget {
public:
// This method should return true if the accelerator was processed.
virtual bool AcceleratorPressed(const Accelerator& accelerator) = 0;
};
}
#endif // VIEWS_ACCELERATOR_H_
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