Removes grab input window and extra grab and ungrab in X11WholeScreenMoveLoop

ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/image/image_skia.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/vector2d_f.h"
 #include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h"
 
-typedef struct _XDisplay XDisplay;
-
-namespace aura {
-class Window;
-}
-
 namespace ui {
 class ScopedEventDispatcher;
 }
 
 namespace views {
 
-class Widget;
-
-// Runs a nested message loop and grabs the mouse. This is used to implement
-// dragging.
+// Runs a nested message loop. This is used to implement dragging including
+// dragging browser tabs and drag and drop.
 class X11WholeScreenMoveLoop : public ui::PlatformEventDispatcher {
  public:
   explicit X11WholeScreenMoveLoop(X11WholeScreenMoveLoopDelegate* delegate);
   virtual ~X11WholeScreenMoveLoop();
 
   // ui:::PlatformEventDispatcher:
   virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
   virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
 
-  // Runs the nested message loop. While the mouse is grabbed, use |cursor| as
-  // the mouse cursor. Returns true if the move-loop is completed successfully.
-  // If the pointer-grab fails, or the move-loop is canceled by the user (e.g.
-  // by pressing escape), then returns false.
-  bool RunMoveLoop(aura::Window* window, gfx::NativeCursor cursor);
-
-  // Updates the cursor while the move loop is running.
-  void UpdateCursor(gfx::NativeCursor cursor);
+  // Runs a nested message loop. Returns true if the move-loop is completed
+  // successfully. Returns false if the move-loop is canceled by the user (e.g.
+  // by pressing Esc).
+  bool RunMoveLoop();
 
   // Ends the RunMoveLoop() that's currently in progress.
   void EndMoveLoop();
 
-  // Sets an image to be used during the drag.
-  void SetDragImage(const gfx::ImageSkia& image, gfx::Vector2dF offset);
-
  private:
-  // Grabs the pointer and keyboard, setting the mouse cursor to |cursor|.
-  // Returns true if the grab was successful.
-  bool GrabPointerAndKeyboard(gfx::NativeCursor cursor);
-
-  // Creates an input-only window to be used during the drag.
-  Window CreateDragInputWindow(XDisplay* display);
-
-  // Creates a window to show the drag image during the drag.
-  void CreateDragImageWindow();
-
-  // Checks to see if |in_image| is an image that has any visible regions
-  // (defined as having a pixel with alpha > 32). If so, return true.
-  bool CheckIfIconValid();
-
   // Dispatch mouse movement event to |delegate_| in a posted task.
   void DispatchMouseMovement();
 
   X11WholeScreenMoveLoopDelegate* delegate_;
 
   // Are we running a nested message loop from RunMoveLoop()?
   bool in_move_loop_;
   scoped_ptr<ui::ScopedEventDispatcher> nested_dispatcher_;
 
   bool should_reset_mouse_flags_;
 
-  // An invisible InputOnly window . We create this window so we can track the
-  // cursor wherever it goes on screen during a drag, since normal windows
-  // don't receive pointer motion events outside of their bounds.
-  ::Window grab_input_window_;
-
   base::Closure quit_closure_;
 
-  // Keeps track of whether the move-loop is cancled by the user (e.g. by
+  // Keeps track of whether the move-loop is canceled by the user (e.g. by
   // pressing escape).
   bool canceled_;
 
-  // A Widget is created during the drag if there is an image available to be
-  // used during the drag.
-  scoped_ptr<Widget> drag_widget_;
-  gfx::ImageSkia drag_image_;
-  gfx::Vector2dF drag_offset_;
   XMotionEvent last_xmotion_;
   base::WeakPtrFactory<X11WholeScreenMoveLoop> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(X11WholeScreenMoveLoop);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_X11_WHOLE_SCREEN_MOVE_LOOP_H_