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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 | |
13 #include <glib.h> | |
14 #include <gtk/gtk.h> | |
15 #include <X11/X.h> | |
16 | |
17 typedef union _XEvent XEvent; | |
18 | |
19 namespace base { | |
20 | |
21 class MessagePumpGlibX : public MessagePumpForUI { | |
22 public: | |
23 MessagePumpGlibX(); | |
24 virtual ~MessagePumpGlibX(); | |
25 | |
26 // Indicates whether a GDK event was injected by chrome (when |true|) or if it | |
27 // was captured and being processed by GDK (when |false|). | |
28 bool IsDispatchingEvent(void) { return dispatching_event_; } | |
29 | |
30 // Overridden from MessagePumpForUI: | |
31 virtual bool RunOnce(GMainContext* context, bool block); | |
32 | |
33 private: | |
34 // Some XEvent's can't be directly read from X event queue and will go | |
35 // through GDK's dispatching process and may get discarded. This function | |
36 // sets up a filter to intercept those XEvent's we are interested in | |
37 // and dispatches them so that they won't get lost. | |
38 static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent, | |
39 GdkEvent* gevent, | |
40 gpointer data); | |
41 | |
42 static void EventDispatcherX(GdkEvent* event, gpointer data); | |
43 | |
44 // Decides whether we are interested in processing this XEvent. | |
45 bool ShouldCaptureXEvent(XEvent* event); | |
46 | |
47 // Dispatches the XEvent and returns true if we should exit the current loop | |
48 // of message processing. | |
49 bool ProcessXEvent(XEvent* event); | |
50 | |
51 // Sends the event to the observers. If an observer returns true, then it does | |
52 // not send the event to any other observers and returns true. Returns false | |
53 // if no observer returns true. | |
54 bool WillProcessXEvent(XEvent* xevent); | |
55 | |
56 // Update the lookup table and flag the events that should be captured and | |
57 // processed so that GDK doesn't get to them. | |
58 void InitializeEventsToCapture(void); | |
59 | |
60 #if defined(HAVE_XINPUT2) | |
61 // Initialize X2 input. | |
62 void InitializeXInput2(void); | |
63 | |
64 // The opcode used for checking events. | |
65 int xiopcode_; | |
66 #endif | |
67 | |
68 // The event source for GDK events. | |
69 GSource* gdksource_; | |
70 | |
71 // The default GDK event dispatcher. This is stored so that it can be restored | |
72 // when necessary during nested event dispatching. | |
73 gboolean (*gdkdispatcher_)(GSource*, GSourceFunc, void*); | |
74 | |
75 // Indicates whether a GDK event was injected by chrome (when |true|) or if it | |
76 // was captured and being processed by GDK (when |false|). | |
77 bool dispatching_event_; | |
78 | |
79 #if ! GTK_CHECK_VERSION(2,18,0) | |
80 // GDK_EVENT_LAST was introduced in GTK+ 2.18.0. For earlier versions, we pick a | |
81 // large enough value (the value of GDK_EVENT_LAST in 2.18.0) so that it works | |
82 // for all versions. | |
83 #define GDK_EVENT_LAST 37 | |
84 #endif | |
85 | |
86 // We do not want to process all the events ourselves. So we use a lookup | |
87 // table to quickly check if a particular event should be handled by us or if | |
88 // it should be passed on to the default GDK handler. | |
89 std::bitset<LASTEvent> capture_x_events_; | |
90 std::bitset<GDK_EVENT_LAST> capture_gdk_events_; | |
91 | |
92 DISALLOW_COPY_AND_ASSIGN(MessagePumpGlibX); | |
93 }; | |
94 | |
95 } // namespace base | |
96 | |
97 #endif // BASE_MESSAGE_PUMP_GLIB_X_H | |
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