src/ui/display/chromeos/x11/native_display_event_dispatcher_x11.h

   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 #ifndef UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_
   6 #define UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_
   7
   8 #include "base/message_loop/message_pump_dispatcher.h"
   9 #include "base/time/tick_clock.h"
  10 #include "base/time/time.h"
  11 #include "ui/display/chromeos/x11/native_display_delegate_x11.h"
  12
  13 namespace ui {
  14
  15 class DISPLAY_EXPORT NativeDisplayEventDispatcherX11
  16     : public base::MessagePumpDispatcher {
  17  public:
  18   NativeDisplayEventDispatcherX11(
  19       NativeDisplayDelegateX11::HelperDelegate* delegate,
  20       int xrandr_event_base);
  21   virtual ~NativeDisplayEventDispatcherX11();
  22
  23   // base::MessagePumpDispatcher overrides:
  24   //
  25   // Called when an RRNotify event is received.  The implementation is
  26   // interested in the cases of RRNotify events which correspond to output
  27   // add/remove events.  Note that Output add/remove events are sent in response
  28   // to our own reconfiguration operations so spurious events are common.
  29   // Spurious events will have no effect.
  30   virtual uint32_t Dispatch(const base::NativeEvent& event) OVERRIDE;
  31
  32   void SetTickClockForTest(scoped_ptr<base::TickClock> tick_clock);
  33
  34   // How long the cached output is valid.
  35   static const int kCachedOutputsExpirationMs;
  36
  37  private:
  38   NativeDisplayDelegateX11::HelperDelegate* delegate_;  // Not owned.
  39
  40   // The base of the event numbers used to represent XRandr events used in
  41   // decoding events regarding output add/remove.
  42   int xrandr_event_base_;
  43
  44   // The last time display observers were notified.
  45   base::TimeTicks last_notified_time_;
  46
  47   scoped_ptr<base::TickClock> tick_clock_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(NativeDisplayEventDispatcherX11);
  50 };
  51
  52 }  // namespace ui
  53
  54 #endif  // UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_