[Refactor]: Move drag_widget_ out of X11WholeScreenMoveLoop

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h

 // Copyright (c) 2012 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_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 
 #include <set>
 #include <vector>
 #include <X11/Xlib.h>
@@ skipping 11 matching lines @@
 #include "ui/views/widget/desktop_aura/x11_move_loop_delegate.h"
 #include "ui/wm/public/drag_drop_client.h"
 
 namespace aura {
 namespace client {
 class DragDropDelegate;
 }
 }
 
 namespace gfx {
+class ImageSkia;
 class Point;
 }
 
 namespace ui {
 class DragSource;
 class DropTargetEvent;
 class OSExchangeData;
 class OSExchangeDataProviderAuraX11;
 class SelectionFormatMap;
 }
 
 namespace views {
 class DesktopNativeCursorManager;
+class Widget;
 class X11MoveLoop;
 
 // Implements drag and drop on X11 for aura. On one side, this class takes raw
 // X11 events forwarded from DesktopWindowTreeHostLinux, while on the other, it
 // handles the views drag events.
 class VIEWS_EXPORT DesktopDragDropClientAuraX11
     : public aura::client::DragDropClient,
       public aura::WindowObserver,
       public X11MoveLoopDelegate {
  public:
@@ skipping 122 matching lines @@
   void CompleteXdndPosition(::Window source_window,
                             const gfx::Point& screen_point);
 
   void SendXdndEnter(::Window dest_window);
   void SendXdndLeave(::Window dest_window);
   void SendXdndPosition(::Window dest_window,
                         const gfx::Point& screen_point,
                         unsigned long event_time);
   void SendXdndDrop(::Window dest_window);
 
+  // Creates a widget for the user to drag around.
+  void CreateDragWidget(const gfx::ImageSkia& image);
+
+  // Returns true if |image| has any visible regions (defined as having a pixel
+  // with alpha > 32).
+  bool IsValidDragImage(const gfx::ImageSkia& image);
+
   // A nested message loop that notifies this object of events through the
   // X11MoveLoopDelegate interface.
   scoped_ptr<X11MoveLoop> move_loop_;
 
   aura::Window* root_window_;
 
   Display* xdisplay_;
   ::Window xwindow_;
 
   ui::X11AtomCache atom_cache_;
@@ skipping 50 matching lines @@
   // XdndActionsList. This is the requested action from the other window. This
   // is DRAG_NONE if we haven't sent out an XdndPosition message yet, haven't
   // yet received an XdndStatus or if the other window has told us that there's
   // no action that we can agree on.
   ui::DragDropTypes::DragOperation negotiated_operation_;
 
   // Ends the move loop if the target is too slow to respond after the mouse is
   // released.
   base::OneShotTimer<DesktopDragDropClientAuraX11> end_move_loop_timer_;
 
+  // Widget that the user drags around. May be NULL.
+  scoped_ptr<Widget> drag_widget_;
+
+  // The offset of |drag_widget_| relative to the mouse position.
+  gfx::Vector2d drag_widget_offset_;
+
   // We use these cursors while dragging.
   gfx::NativeCursor grab_cursor_;
   gfx::NativeCursor copy_grab_cursor_;
   gfx::NativeCursor move_grab_cursor_;
 
   base::WeakPtrFactory<DesktopDragDropClientAuraX11> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopDragDropClientAuraX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_