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 namespace base {
  21 template <typename T> struct DefaultSingletonTraits;
  22 }
  23
  24 namespace views {
  25
  26 // A singleton that owns global objects related to the desktop and listens for
  27 // X11 events on the X11 root window. Destroys itself when aura::Env is
  28 // deleted.
  29 class VIEWS_EXPORT X11DesktopHandler : public ui::PlatformEventDispatcher,
  30                                        public aura::EnvObserver {
  31  public:
  32   // Returns the singleton handler.
  33   static X11DesktopHandler* get();
  34
  35   // Gets/sets the X11 server time of the most recent mouse click, touch or
  36   // key press on a Chrome window.
  37   int wm_user_time_ms() const {
  38     return wm_user_time_ms_;
  39   }
  40   void set_wm_user_time_ms(unsigned long time_ms) {
  41     wm_user_time_ms_ = time_ms;
  42   }
  43
  44   // Sends a request to the window manager to activate |window|.
  45   // This method should only be called if the window is already mapped.
  46   void ActivateWindow(::Window window);
  47
  48   // Attempts to get the window manager to deactivate |window| by moving it to
  49   // the bottom of the stack. Regardless of whether |window| was actually
  50   // deactivated, sets the window as inactive in our internal state.
  51   void DeactivateWindow(::Window window);
  52
  53   // Checks if the current active window is |window|.
  54   bool IsActiveWindow(::Window window) const;
  55
  56   // Processes activation/focus related events. Some of these events are
  57   // dispatched to the X11 window dispatcher, and not to the X11 root-window
  58   // dispatcher. The window dispatcher sends these events to here.
  59   void ProcessXEvent(XEvent* event);
  60
  61   // ui::PlatformEventDispatcher
  62   bool CanDispatchEvent(const ui::PlatformEvent& event) override;
  63   uint32_t DispatchEvent(const ui::PlatformEvent& event) override;
  64
  65   // Overridden from aura::EnvObserver:
  66   void OnWindowInitialized(aura::Window* window) override;
  67   void OnWillDestroyEnv() override;
  68
  69  private:
  70   enum ActiveState {
  71     ACTIVE,
  72     NOT_ACTIVE
  73   };
  74
  75   X11DesktopHandler();
  76   ~X11DesktopHandler() override;
  77
  78   // Handles changes in activation.
  79   void OnActiveWindowChanged(::Window window, ActiveState active_state);
  80
  81   // Called when |window| has been created or destroyed. |window| may not be
  82   // managed by Chrome.
  83   void OnWindowCreatedOrDestroyed(int event_type, XID window);
  84
  85   // The display and the native X window hosting the root window.
  86   XDisplay* xdisplay_;
  87
  88   // The native root window.
  89   ::Window x_root_window_;
  90
  91   // The last known active X window
  92   ::Window x_active_window_;
  93
  94   // The X11 server time of the most recent mouse click, touch, or key press
  95   // on a Chrome window.
  96   unsigned long wm_user_time_ms_;
  97
  98   // The active window according to X11 server.
  99   ::Window current_window_;
 100
 101   // Whether we should treat |current_window_| as active. In particular, we
 102   // pretend that a window is deactivated after a call to DeactivateWindow().
 103   ActiveState current_window_active_state_;
 104
 105   ui::X11AtomCache atom_cache_;
 106
 107   bool wm_supports_active_window_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(X11DesktopHandler);
 110 };
 111
 112 }  // namespace views
 113
 114 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_H_