ui/views/widget/desktop_aura/x11_desktop_handler.h

   1 // Copyright (c) 2012 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_X11_DESKTOP_HANDLER_H_
   6 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_
   7
   8 #include <X11/Xlib.h>
   9 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
  10 #undef RootWindow
  11
  12 #include <vector>
  13
  14 #include "ui/aura/env_observer.h"
  15 #include "ui/events/platform/platform_event_dispatcher.h"
  16 #include "ui/gfx/x/x11_atom_cache.h"
  17 #include "ui/gfx/x/x11_types.h"
  18 #include "ui/views/views_export.h"
  19
  20 template <typename T> struct DefaultSingletonTraits;
  21
  22 namespace views {
  23
  24 // A singleton that owns global objects related to the desktop and listens for
  25 // X11 events on the X11 root window. Destroys itself when aura::Env is
  26 // deleted.
  27 class VIEWS_EXPORT X11DesktopHandler : public ui::PlatformEventDispatcher,
  28                                        public aura::EnvObserver {
  29  public:
  30   // Returns the singleton handler.
  31   static X11DesktopHandler* get();
  32
  33   // Gets/sets the X11 server time of the most recent mouse click, touch or
  34   // key press on a Chrome window.
  35   int wm_user_time_ms() const {
  36     return wm_user_time_ms_;
  37   }
  38   void set_wm_user_time_ms(unsigned long time_ms) {
  39     wm_user_time_ms_ = time_ms;
  40   }
  41
  42   // Sends a request to the window manager to activate |window|.
  43   // This method should only be called if the window is already mapped.
  44   void ActivateWindow(::Window window);
  45
  46   // Attempts to get the window manager to deactivate |window| by moving it to
  47   // the bottom of the stack. Regardless of whether |window| was actually
  48   // deactivated, sets the window as inactive in our internal state.
  49   void DeactivateWindow(::Window window);
  50
  51   // Checks if the current active window is |window|.
  52   bool IsActiveWindow(::Window window) const;
  53
  54   // Processes activation/focus related events. Some of these events are
  55   // dispatched to the X11 window dispatcher, and not to the X11 root-window
  56   // dispatcher. The window dispatcher sends these events to here.
  57   void ProcessXEvent(XEvent* event);
  58
  59   // ui::PlatformEventDispatcher
  60   bool CanDispatchEvent(const ui::PlatformEvent& event) override;
  61   uint32_t DispatchEvent(const ui::PlatformEvent& event) override;
  62
  63   // Overridden from aura::EnvObserver:
  64   void OnWindowInitialized(aura::Window* window) override;
  65   void OnWillDestroyEnv() override;
  66
  67  private:
  68   enum ActiveState {
  69     ACTIVE,
  70     NOT_ACTIVE
  71   };
  72
  73   X11DesktopHandler();
  74   ~X11DesktopHandler() override;
  75
  76   // Handles changes in activation.
  77   void OnActiveWindowChanged(::Window window, ActiveState active_state);
  78
  79   // Called when |window| has been created or destroyed. |window| may not be
  80   // managed by Chrome.
  81   void OnWindowCreatedOrDestroyed(int event_type, XID window);
  82
  83   // The display and the native X window hosting the root window.
  84   XDisplay* xdisplay_;
  85
  86   // The native root window.
  87   ::Window x_root_window_;
  88
  89   // The X11 server time of the most recent mouse click, touch, or key press
  90   // on a Chrome window.
  91   unsigned long wm_user_time_ms_;
  92
  93   // The active window according to X11 server.
  94   ::Window current_window_;
  95
  96   // Whether we should treat |current_window_| as active. In particular, we
  97   // pretend that a window is deactivated after a call to DeactivateWindow().
  98   ActiveState current_window_active_state_;
  99
 100   ui::X11AtomCache atom_cache_;
 101
 102   bool wm_supports_active_window_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
 105 };
 106
 107 }  // namespace views
 108
 109 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_