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      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_X11_WHOLE_SCREEN_MOVE_LOOP_H_
      6 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/message_loop/message_loop.h"
     10 #include "ui/gfx/native_widget_types.h"
     11 #include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h"
     12 
     13 namespace aura {
     14 class Window;
     15 }
     16 
     17 namespace views {
     18 
     19 // Runs a nested message loop and grabs the mouse. This is used to implement
     20 // dragging.
     21 class X11WholeScreenMoveLoop : public base::MessageLoop::Dispatcher {
     22  public:
     23   explicit X11WholeScreenMoveLoop(X11WholeScreenMoveLoopDelegate* delegate);
     24   virtual ~X11WholeScreenMoveLoop();
     25 
     26   // Overridden from base::MessageLoop::Dispatcher:
     27   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
     28 
     29   // Runs the nested message loop. While the mouse is grabbed, use |cursor| as
     30   // the mouse cursor. Returns true if there we were able to grab the pointer
     31   // and run the move loop.
     32   bool RunMoveLoop(aura::Window* window, gfx::NativeCursor cursor);
     33 
     34   // Updates the cursor while the move loop is running.
     35   void UpdateCursor(gfx::NativeCursor cursor);
     36 
     37   // Ends the RunMoveLoop() that's currently in progress.
     38   void EndMoveLoop();
     39 
     40  private:
     41   // Grabs the pointer, setting the mouse cursor to |cursor|. Returns true if
     42   // the grab was successful.
     43   bool GrabPointerWithCursor(gfx::NativeCursor cursor);
     44 
     45   X11WholeScreenMoveLoopDelegate* delegate_;
     46 
     47   // Are we running a nested message loop from RunMoveLoop()?
     48   bool in_move_loop_;
     49 
     50   // An invisible InputOnly window . We create this window so we can track the
     51   // cursor wherever it goes on screen during a drag, since normal windows
     52   // don't receive pointer motion events outside of their bounds.
     53   ::Window grab_input_window_;
     54 
     55   base::Closure quit_closure_;
     56 
     57   DISALLOW_COPY_AND_ASSIGN(X11WholeScreenMoveLoop);
     58 };
     59 
     60 }  // namespace views
     61 
     62 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
     63