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1 // Copyright 2014 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 #include "ui/events/platform/x11/x11_event_source.h" | |
6 | |
7 #include <glib.h> | |
8 #include <X11/Xlib.h> | |
9 | |
10 namespace ui { | |
11 | |
12 namespace { | |
13 | |
14 struct GLibX11Source : public GSource { | |
15 // Note: The GLibX11Source is created and destroyed by GLib. So its | |
16 // constructor/destructor may or may not get called. | |
17 XDisplay* display; | |
18 GPollFD* poll_fd; | |
19 }; | |
20 | |
21 gboolean XSourcePrepare(GSource* source, gint* timeout_ms) { | |
22 GLibX11Source* gxsource = static_cast<GLibX11Source*>(source); | |
23 if (XPending(gxsource->display)) | |
24 *timeout_ms = 0; | |
25 else | |
26 *timeout_ms = -1; | |
27 return FALSE; | |
28 } | |
29 | |
30 gboolean XSourceCheck(GSource* source) { | |
31 GLibX11Source* gxsource = static_cast<GLibX11Source*>(source); | |
32 return XPending(gxsource->display); | |
33 } | |
34 | |
35 gboolean XSourceDispatch(GSource* source, | |
36 GSourceFunc unused_func, | |
37 gpointer data) { | |
38 X11EventSource* x11_source = static_cast<X11EventSource*>(data); | |
39 x11_source->DispatchXEvents(); | |
40 return TRUE; | |
41 } | |
42 | |
43 GSourceFuncs XSourceFuncs = { | |
44 XSourcePrepare, | |
45 XSourceCheck, | |
46 XSourceDispatch, | |
47 NULL | |
48 }; | |
49 | |
50 class X11EventSourceGlib : public X11EventSource { | |
51 public: | |
52 explicit X11EventSourceGlib(XDisplay* display) | |
53 : X11EventSource(display), | |
54 x_source_(NULL) { | |
55 InitXSource(ConnectionNumber(display)); | |
56 } | |
57 | |
58 virtual ~X11EventSourceGlib() { | |
59 g_source_destroy(x_source_); | |
60 g_source_unref(x_source_); | |
61 } | |
62 | |
63 private: | |
64 void InitXSource(int fd) { | |
65 CHECK(!x_source_); | |
66 CHECK(display()) << "Unable to get connection to X server"; | |
67 | |
68 x_poll_.reset(new GPollFD()); | |
69 x_poll_->fd = fd; | |
70 x_poll_->events = G_IO_IN; | |
71 x_poll_->revents = 0; | |
72 | |
73 GLibX11Source* glib_x_source = static_cast<GLibX11Source*> | |
74 (g_source_new(&XSourceFuncs, sizeof(GLibX11Source))); | |
75 glib_x_source->display = display(); | |
76 glib_x_source->poll_fd = x_poll_.get(); | |
77 | |
78 x_source_ = glib_x_source; | |
79 g_source_add_poll(x_source_, x_poll_.get()); | |
80 g_source_set_can_recurse(x_source_, TRUE); | |
81 g_source_set_callback(x_source_, NULL, this, NULL); | |
82 g_source_attach(x_source_, g_main_context_default()); | |
83 } | |
84 | |
85 // The GLib event source for X events. | |
86 GSource* x_source_; | |
87 | |
88 // The poll attached to |x_source_|. | |
89 scoped_ptr<GPollFD> x_poll_; | |
90 | |
91 DISALLOW_COPY_AND_ASSIGN(X11EventSourceGlib); | |
92 }; | |
93 | |
94 } // namespace | |
95 | |
96 scoped_ptr<PlatformEventSource> PlatformEventSource::CreateDefault() { | |
97 return scoped_ptr<PlatformEventSource>( | |
98 new X11EventSourceGlib(gfx::GetXDisplay())); | |
99 } | |
100 | |
101 } // namespace ui | |
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