message_pump_glib_x.h revision 3f50c38dc070f4bb515c1b64450dae14f316474e 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef BASE_MESSAGE_PUMP_GLIB_X_H
6#define BASE_MESSAGE_PUMP_GLIB_X_H
7
8#include "base/message_pump.h"
9#include "base/message_pump_glib.h"
10
11#include <bitset>
12#include <set>
13
14#include <glib.h>
15#include <gtk/gtk.h>
16#include <X11/X.h>
17
18namespace base {
19
20class MessagePumpGlibX : public MessagePumpForUI {
21 public:
22  MessagePumpGlibX();
23  virtual ~MessagePumpGlibX();
24
25  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
26  // was captured and being processed by GDK (when |false|).
27  bool IsDispatchingEvent(void) { return dispatching_event_; }
28
29#if defined(HAVE_XINPUT2)
30  // Setup an X Window for XInput2 events.
31  void SetupXInput2ForXWindow(Window xid);
32#endif
33
34  // Overridden from MessagePumpForUI:
35  virtual bool RunOnce(GMainContext* context, bool block);
36
37 private:
38  static void EventDispatcherX(GdkEvent* event, gpointer data);
39
40  // Update the lookup table and flag the events that should be captured and
41  // processed so that GDK doesn't get to them.
42  void InitializeEventsToCapture(void);
43
44#if defined(HAVE_XINPUT2)
45  // Initialize X2 input.
46  void InitializeXInput2(void);
47
48  // The opcode used for checking events.
49  int xiopcode_;
50
51  // The list of master pointer devices. We maintain this list so that it is not
52  // necessary to query X for the list of devices for each GdkWindow created.
53  std::set<int> masters_;
54
55  // The list of slave (physical) pointer devices.
56  // TODO(sad): This is currently unused, and may be removed eventually.
57  std::set<int> slaves_;
58#endif
59
60  // The event source for GDK events.
61  GSource* gdksource_;
62
63  // The default GDK event dispatcher. This is stored so that it can be restored
64  // when necessary during nested event dispatching.
65  gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*);
66
67  // Indicates whether a GDK event was injected by chrome (when |true|) or if it
68  // was captured and being processed by GDK (when |false|).
69  bool dispatching_event_;
70
71#if ! GTK_CHECK_VERSION(2,18,0)
72// GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a
73// large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works
74// for all versions.
75#define GDK_EVENT_LAST 37
76#endif
77
78  // We do not want to process all the events ourselves. So we use a lookup
79  // table to quickly check if a particular event should be handled by us or if
80  // it should be passed on to the default GDK handler.
81  std::bitset<LASTEvent> capture_x_events_;
82  std::bitset<GDK_EVENT_LAST> capture_gdk_events_;
83
84  DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX);
85};
86
87}  // namespace base
88
89#endif  // BASE_MESSAGE_PUMP_GLIB_X_H
90