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
15namespace libgtk2ui {
16
17// static
18Gtk2EventLoop* Gtk2EventLoop::GetInstance() {
19  return Singleton<Gtk2EventLoop>::get();
20}
21
22Gtk2EventLoop::Gtk2EventLoop() {
23  gdk_event_handler_set(GdkEventTrampoline, this, NULL);
24}
25
26Gtk2EventLoop::~Gtk2EventLoop() {
27  gdk_event_handler_set(reinterpret_cast<GdkEventFunc>(gtk_main_do_event),
28                        NULL, NULL);
29}
30
31// static
32void Gtk2EventLoop::GdkEventTrampoline(GdkEvent* event, gpointer data) {
33  Gtk2EventLoop* loop = reinterpret_cast<Gtk2EventLoop*>(data);
34  loop->DispatchGdkEvent(event);
35}
36
37void 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
50void 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