desktop_screen_x11.h revision 68043e1e95eeb07d5cae7aca370b26518b0867d6 
1// Copyright (c) 2013 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_SCREEN_X11_H_
6#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_SCREEN_X11_H_
7
8#include "base/message_loop/message_pump_dispatcher.h"
9#include "base/observer_list.h"
10#include "base/timer/timer.h"
11#include "ui/gfx/screen.h"
12#include "ui/views/views_export.h"
13
14namespace gfx {
15class Display;
16}
17
18typedef unsigned long XID;
19typedef XID Window;
20typedef struct _XDisplay Display;
21
22namespace views {
23class DesktopScreenX11Test;
24
25// Our singleton screen implementation that talks to xrandr.
26class VIEWS_EXPORT DesktopScreenX11 : public gfx::Screen,
27                                      public base::MessagePumpDispatcher {
28 public:
29  DesktopScreenX11();
30
31  virtual ~DesktopScreenX11();
32
33  // Takes a set of displays and dispatches the screen change events to
34  // listeners. Exposed for testing.
35  void ProcessDisplayChange(const std::vector<gfx::Display>& displays);
36
37  // Overridden from gfx::Screen:
38  virtual bool IsDIPEnabled() OVERRIDE;
39  virtual gfx::Point GetCursorScreenPoint() OVERRIDE;
40  virtual gfx::NativeWindow GetWindowUnderCursor() OVERRIDE;
41  virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point)
42      OVERRIDE;
43  virtual int GetNumDisplays() const OVERRIDE;
44  virtual std::vector<gfx::Display> GetAllDisplays() const OVERRIDE;
45  virtual gfx::Display GetDisplayNearestWindow(
46      gfx::NativeView window) const OVERRIDE;
47  virtual gfx::Display GetDisplayNearestPoint(
48      const gfx::Point& point) const OVERRIDE;
49  virtual gfx::Display GetDisplayMatching(
50      const gfx::Rect& match_rect) const OVERRIDE;
51  virtual gfx::Display GetPrimaryDisplay() const OVERRIDE;
52  virtual void AddObserver(gfx::DisplayObserver* observer) OVERRIDE;
53  virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE;
54
55  // Overridden from MessagePumpDispatcher:
56  virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
57
58 private:
59  friend class DesktopScreenX11Test;
60
61  // Constructor used in tests.
62  DesktopScreenX11(const std::vector<gfx::Display>& test_displays);
63
64  // Builds a list of displays from the current screen information offered by
65  // the X server.
66  std::vector<gfx::Display> BuildDisplaysFromXRandRInfo();
67
68  // We delay updating the display so we can coalesce events.
69  void ConfigureTimerFired();
70
71  Display* xdisplay_;
72  ::Window x_root_window_;
73
74  // Whether the x server supports the XRandR extension.
75  bool has_xrandr_;
76
77  // The base of the event numbers used to represent XRandr events used in
78  // decoding events regarding output add/remove.
79  int xrandr_event_base_;
80
81  // The display objects we present to chrome.
82  std::vector<gfx::Display> displays_;
83
84  // The timer to delay configuring outputs. See also the comments in
85  // Dispatch().
86  scoped_ptr<base::OneShotTimer<DesktopScreenX11> > configure_timer_;
87
88  ObserverList<gfx::DisplayObserver> observer_list_;
89
90  DISALLOW_COPY_AND_ASSIGN(DesktopScreenX11);
91};
92
93}  // namespace views
94
95#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_SCREEN_X11_H_
96