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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.
#ifndef UI_VIEWS_EVENTS_EVENT_H_
#define UI_VIEWS_EVENTS_EVENT_H_
#pragma once
#include "base/basictypes.h"
#include "ui/base/keycodes/keyboard_codes.h"
#include "ui/gfx/point.h"
#include "ui/views/native_types.h"
class OSExchangeData;
namespace ui {
class View;
class Event {
public:
// Event types.
enum EventType { ET_UNKNOWN = 0,
ET_MOUSE_PRESSED,
ET_MOUSE_DRAGGED,
ET_MOUSE_RELEASED,
ET_MOUSE_MOVED,
ET_MOUSE_ENTERED,
ET_MOUSE_EXITED,
ET_KEY_PRESSED,
ET_KEY_RELEASED,
ET_MOUSEWHEEL,
ET_DROP_TARGET_EVENT,
ET_FOCUS_CHANGE };
// Event flags currently supported. Although this is a "views"
// file, this header is used on non-views platforms (e.g. OSX). For
// example, these EventFlags are used by the automation provider for
// all platforms.
enum EventFlags { EF_CAPS_LOCK_DOWN = 1 << 0,
EF_SHIFT_DOWN = 1 << 1,
EF_CONTROL_DOWN = 1 << 2,
EF_ALT_DOWN = 1 << 3,
EF_LEFT_BUTTON_DOWN = 1 << 4,
EF_MIDDLE_BUTTON_DOWN = 1 << 5,
EF_RIGHT_BUTTON_DOWN = 1 << 6,
EF_COMMAND_DOWN = 1 << 7, // Only useful on OSX
};
EventType type() const { return type_; }
int flags() const { return flags_; }
void set_flags(int flags) { flags_ = flags; }
// The following methods return true if the respective keys were pressed at
// the time the event was created.
bool IsShiftDown() const { return (flags_ & EF_SHIFT_DOWN) != 0; }
bool IsControlDown() const { return (flags_ & EF_CONTROL_DOWN) != 0; }
bool IsCapsLockDown() const { return (flags_ & EF_CAPS_LOCK_DOWN) != 0; }
bool IsAltDown() const { return (flags_ & EF_ALT_DOWN) != 0; }
// Return a mask of active modifier keycodes from
// ui/base/keycodes/keyboard_codes.h
int GetModifiers() const;
// Returns true if the event is any kind of mouse event.
bool IsMouseEvent() const {
return type_ == ET_MOUSE_PRESSED ||
type_ == ET_MOUSE_RELEASED ||
type_ == ET_MOUSE_MOVED ||
type_ == ET_MOUSE_EXITED ||
type_ == ET_MOUSEWHEEL;
}
protected:
Event(EventType type, int flags);
private:
EventType type_;
int flags_;
DISALLOW_COPY_AND_ASSIGN(Event);
};
class LocatedEvent : public Event {
public:
int x() const { return location_.x(); }
int y() const { return location_.y(); }
const gfx::Point& location() const { return location_; }
protected:
// Constructors called from subclasses.
// Simple initialization from cracked metadata.
LocatedEvent(EventType type, const gfx::Point& location, int flags);
// During event processing, event locations are translated from the
// coordinates of a source View to a target as the tree is descended. This
// translation occurs by constructing a new event from another event object,
// specifying a |source| and |target| View to facilitate coordinate
// conversion. Events that are processed in this manner will have a similar
// constructor that calls into this one.
LocatedEvent(const LocatedEvent& other, View* source, View* target);
private:
gfx::Point location_;
DISALLOW_COPY_AND_ASSIGN(LocatedEvent);
};
class MouseEvent : public LocatedEvent {
public:
// Flags specific to mouse events
enum MouseEventFlags {
EF_IS_DOUBLE_CLICK = 1 << 16,
EF_IS_NON_CLIENT = 1 << 17
};
explicit MouseEvent(NativeEvent native_event);
MouseEvent(const MouseEvent& other, View* source, View* target);
// Conveniences to quickly test what button is down:
bool IsOnlyLeftMouseButton() const {
return (flags() & EF_LEFT_BUTTON_DOWN) &&
!(flags() & (EF_MIDDLE_BUTTON_DOWN | EF_RIGHT_BUTTON_DOWN));
}
bool IsLeftMouseButton() const {
return (flags() & EF_LEFT_BUTTON_DOWN) != 0;
}
bool IsOnlyMiddleMouseButton() const {
return (flags() & EF_MIDDLE_BUTTON_DOWN) &&
!(flags() & (EF_LEFT_BUTTON_DOWN | EF_RIGHT_BUTTON_DOWN));
}
bool IsMiddleMouseButton() const {
return (flags() & EF_MIDDLE_BUTTON_DOWN) != 0;
}
bool IsOnlyRightMouseButton() const {
return (flags() & EF_RIGHT_BUTTON_DOWN) &&
!(flags() & (EF_LEFT_BUTTON_DOWN | EF_MIDDLE_BUTTON_DOWN));
}
bool IsRightMouseButton() const {
return (flags() & EF_RIGHT_BUTTON_DOWN) != 0;
}
private:
DISALLOW_COPY_AND_ASSIGN(MouseEvent);
};
class KeyEvent : public Event {
public:
explicit KeyEvent(NativeEvent native_event);
KeyboardCode key_code() const { return key_code_; }
int repeat_count() const { return repeat_count_; }
private:
KeyboardCode key_code_;
int repeat_count_;
int message_flags_;
DISALLOW_COPY_AND_ASSIGN(KeyEvent);
};
class MouseWheelEvent : public LocatedEvent {
public:
explicit MouseWheelEvent(NativeEvent native_event);
int offset() const { return offset_; }
private:
int offset_;
DISALLOW_COPY_AND_ASSIGN(MouseWheelEvent);
};
/*
class DropTargetEvent : public LocatedEvent {
public:
explicit DropTargetEvent(NativeEvent native_event);
const OSExchangeData& data() const { return data_; }
int source_operations() const { return source_operations_; }
private:
const OSExchangeData& data_;
int source_operations_;
DISALLOW_COPY_AND_ASSIGN(DropTargetEvent);
};
*/
} // namespace ui
#endif // UI_VIEWS_EVENTS_EVENT_H_
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