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      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_WINDOW_EVENT_FILTER_H_
      6 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WINDOW_EVENT_FILTER_H_
      7 
      8 #include <X11/Xlib.h>
      9 
     10 #include "base/compiler_specific.h"
     11 #include "base/message_loop/message_loop.h"
     12 #include "ui/events/event_handler.h"
     13 #include "ui/gfx/x/x11_atom_cache.h"
     14 #include "ui/gfx/x/x11_types.h"
     15 #include "ui/views/views_export.h"
     16 
     17 namespace aura {
     18 class Window;
     19 }
     20 
     21 namespace gfx {
     22 class Point;
     23 }
     24 
     25 namespace views {
     26 class DesktopWindowTreeHost;
     27 class NativeWidgetAura;
     28 
     29 // An EventFilter that sets properties on X11 windows.
     30 class VIEWS_EXPORT X11WindowEventFilter : public ui::EventHandler {
     31  public:
     32   explicit X11WindowEventFilter(DesktopWindowTreeHost* window_tree_host);
     33   virtual ~X11WindowEventFilter();
     34 
     35   // Overridden from ui::EventHandler:
     36   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
     37 
     38  private:
     39   // Called when the user clicked the caption area.
     40   void OnClickedCaption(ui::MouseEvent* event,
     41                         int previous_click_component);
     42 
     43   // Called when the user clicked the maximize button.
     44   void OnClickedMaximizeButton(ui::MouseEvent* event);
     45 
     46   void ToggleMaximizedState();
     47 
     48   // Dispatches a _NET_WM_MOVERESIZE message to the window manager to tell it
     49   // to act as if a border or titlebar drag occurred.
     50   bool DispatchHostWindowDragMovement(int hittest,
     51                                       const gfx::Point& screen_location);
     52 
     53   // The display and the native X window hosting the root window.
     54   XDisplay* xdisplay_;
     55   ::Window xwindow_;
     56 
     57   // The native root window.
     58   ::Window x_root_window_;
     59 
     60   ui::X11AtomCache atom_cache_;
     61 
     62   DesktopWindowTreeHost* window_tree_host_;
     63 
     64   // True if |xwindow_| is the current _NET_ACTIVE_WINDOW.
     65   bool is_active_;
     66 
     67   // The non-client component for the target of a MouseEvent. Mouse events can
     68   // be destructive to the window tree, which can cause the component of a
     69   // ui::EF_IS_DOUBLE_CLICK event to no longer be the same as that of the
     70   // initial click. Acting on a double click should only occur for matching
     71   // components.
     72   int click_component_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(X11WindowEventFilter);
     75 };
     76 
     77 }  // namespace views
     78 
     79 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WINDOW_EVENT_FILTER_H_
     80