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 "chrome/browser/ui/libgtk2ui/gtk2_event_loop.h"
6
7 #include <gdk/gdk.h>
8 #include <gdk/gdkx.h>
9 #include <gtk/gtk.h>
10 #include <X11/X.h>
11
12 #include "base/memory/singleton.h"
13 #include "ui/gfx/x/x11_types.h"
14
15 namespace libgtk2ui {
16
17 // static
GetInstance()18 Gtk2EventLoop* Gtk2EventLoop::GetInstance() {
19 return Singleton<Gtk2EventLoop>::get();
20 }
21
Gtk2EventLoop()22 Gtk2EventLoop::Gtk2EventLoop() {
23 gdk_event_handler_set(GdkEventTrampoline, this, NULL);
24 }
25
~Gtk2EventLoop()26 Gtk2EventLoop::~Gtk2EventLoop() {
27 gdk_event_handler_set(reinterpret_cast<GdkEventFunc>(gtk_main_do_event),
28 NULL, NULL);
29 }
30
31 // static
GdkEventTrampoline(GdkEvent * event,gpointer data)32 void Gtk2EventLoop::GdkEventTrampoline(GdkEvent* event, gpointer data) {
33 Gtk2EventLoop* loop = reinterpret_cast<Gtk2EventLoop*>(data);
34 loop->DispatchGdkEvent(event);
35 }
36
DispatchGdkEvent(GdkEvent * gdk_event)37 void Gtk2EventLoop::DispatchGdkEvent(GdkEvent* gdk_event) {
38 switch (gdk_event->type) {
39 case GDK_KEY_PRESS:
40 case GDK_KEY_RELEASE:
41 ProcessGdkEventKey(gdk_event->key);
42 break;
43 default:
44 break; // Do nothing.
45 }
46
47 gtk_main_do_event(gdk_event);
48 }
49
ProcessGdkEventKey(const GdkEventKey & gdk_event_key)50 void Gtk2EventLoop::ProcessGdkEventKey(const GdkEventKey& gdk_event_key) {
51 // This function translates GdkEventKeys into XKeyEvents and puts them to
52 // the X event queue.
53 //
54 // base::MessagePumpX11 is using the X11 event queue and all key events should
55 // be processed there. However, there are cases(*1) that GdkEventKeys are
56 // created instead of XKeyEvents. In these cases, we have to translate
57 // GdkEventKeys to XKeyEvents and puts them to the X event queue so our main
58 // event loop can handle those key events.
59 //
60 // (*1) At least ibus-gtk in async mode creates a copy of user's key event and
61 // pushes it back to the GDK event queue. In this case, there is no
62 // corresponding key event in the X event queue. So we have to handle this
63 // case. ibus-gtk is used through gtk-immodule to support IMEs.
64
65 XEvent x_event = {0};
66 x_event.xkey.type =
67 gdk_event_key.type == GDK_KEY_PRESS ? KeyPress : KeyRelease;
68 x_event.xkey.send_event = gdk_event_key.send_event;
69 x_event.xkey.display = gfx::GetXDisplay();
70 x_event.xkey.window = GDK_WINDOW_XID(gdk_event_key.window);
71 x_event.xkey.root = DefaultRootWindow(x_event.xkey.display);
72 x_event.xkey.time = gdk_event_key.time;
73 x_event.xkey.state = gdk_event_key.state;
74 x_event.xkey.keycode = gdk_event_key.hardware_keycode;
75 x_event.xkey.same_screen = true;
76
77 XPutBackEvent(x_event.xkey.display, &x_event);
78 }
79
80 } // namespace libgtk2ui
81