ui/events/platform/x11/x11_event_source_libevent.cc

   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 <X11/Xlib.h>
   8
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/message_loop/message_pump_libevent.h"
  11
  12 namespace ui {
  13
  14 namespace {
  15
  16 class X11EventSourceLibevent : public X11EventSource,
  17                                public base::MessagePumpLibevent::Watcher {
  18  public:
  19   explicit X11EventSourceLibevent(XDisplay* display)
  20       : X11EventSource(display),
  21         initialized_(false) {
  22     AddEventWatcher();
  23   }
  24
  25   virtual ~X11EventSourceLibevent() {
  26   }
  27
  28  private:
  29   void AddEventWatcher() {
  30     if (initialized_)
  31       return;
  32     if (!base::MessageLoop::current())
  33       return;
  34
  35     int fd = ConnectionNumber(display());
  36     base::MessageLoopForUI::current()->WatchFileDescriptor(fd, true,
  37         base::MessagePumpLibevent::WATCH_READ, &watcher_controller_, this);
  38     initialized_ = true;
  39   }
  40
  41   // PlatformEventSource:
  42   virtual void OnDispatcherListChanged() override {
  43     AddEventWatcher();
  44   }
  45
  46   // base::MessagePumpLibevent::Watcher:
  47   virtual void OnFileCanReadWithoutBlocking(int fd) override {
  48     DispatchXEvents();
  49   }
  50
  51   virtual void OnFileCanWriteWithoutBlocking(int fd) override {
  52     NOTREACHED();
  53   }
  54
  55   base::MessagePumpLibevent::FileDescriptorWatcher watcher_controller_;
  56   bool initialized_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(X11EventSourceLibevent);
  59 };
  60
  61 }  // namespace
  62
  63 scoped_ptr<PlatformEventSource> PlatformEventSource::CreateDefault() {
  64   return scoped_ptr<PlatformEventSource>(
  65       new X11EventSourceLibevent(gfx::GetXDisplay()));
  66 }
  67
  68 }  // namespace ui