blob: 6ecc3890e8eafe88bb1ba851f89ab33403e1c560 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// 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 UI_BASE_EVENTS_EVENT_HANDLER_H_
#define UI_BASE_EVENTS_EVENT_HANDLER_H_
#include <stack>
#include <vector>
#include "base/basictypes.h"
#include "ui/base/events/event_constants.h"
#include "ui/base/ui_export.h"
namespace ui {
class CancelModeEvent;
class Event;
class EventDispatcher;
class EventTarget;
class GestureEvent;
class KeyEvent;
class MouseEvent;
class ScrollEvent;
class TouchEvent;
// Dispatches events to appropriate targets. The default implementations of
// all of the specific handlers (e.g. OnKeyEvent, OnMouseEvent) do nothing.
class UI_EXPORT EventHandler {
public:
EventHandler();
virtual ~EventHandler();
// This is called for all events. The default implementation routes the event
// to one of the event-specific callbacks (OnKeyEvent, OnMouseEvent etc.). If
// this is overridden, then normally, the override should chain into the
// default implementation for un-handled events.
virtual void OnEvent(Event* event);
virtual void OnKeyEvent(KeyEvent* event);
virtual void OnMouseEvent(MouseEvent* event);
virtual void OnScrollEvent(ScrollEvent* event);
virtual void OnTouchEvent(TouchEvent* event);
virtual void OnGestureEvent(GestureEvent* event);
virtual void OnCancelMode(CancelModeEvent* event);
private:
friend class EventDispatcher;
// EventDispatcher pushes itself on the top of this stack while dispatching
// events to this then pops itself off when done.
std::stack<EventDispatcher*> dispatchers_;
DISALLOW_COPY_AND_ASSIGN(EventHandler);
};
typedef std::vector<EventHandler*> EventHandlerList;
} // namespace ui
#endif // UI_BASE_EVENTS_EVENT_HANDLER_H_
|
