Attach panel while dragging to bring it in front of other panels.

ash/wm/panels/panel_window_resizer.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 ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 #define ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace ash {
 
+class WindowResizerOwner;
+
 namespace internal {
 class PanelLayoutManager;
 }
 
 // PanelWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
 // moving or resizing panel window. These can be attached and detached from the
 // launcher.
 class ASH_EXPORT PanelWindowResizer : public WindowResizer {
  public:
   virtual ~PanelWindowResizer();
 
   // Creates a new PanelWindowResizer. The caller takes ownership of the
   // returned object. Returns NULL if not resizable.
-  static PanelWindowResizer* Create(aura::Window* window,
+  static PanelWindowResizer* Create(WindowResizerOwner* owner,
+                                    aura::Window* window,
                                     const gfx::Point& location,
                                     int window_component);
 
   // Returns true if the drag will result in changing the window in anyway.
   bool is_resizable() const { return details_.is_resizable; }
 
   bool changed_size() const {
     return !(details_.bounds_change & kBoundsChange_Repositions);
   }
 
   // WindowResizer overides:
   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
   virtual void CompleteDrag(int event_flags) OVERRIDE;
   virtual void RevertDrag() OVERRIDE;
   virtual aura::Window* GetTarget() OVERRIDE;
 
   const gfx::Point& GetInitialLocationInParentForTest() const {
     return details_.initial_location_in_parent;
   }
 
  private:
-  explicit PanelWindowResizer(const Details& details);
+  explicit PanelWindowResizer(WindowResizerOwner* owner,
+                              const Details& details);
 
   // Checks if the provided window bounds should attach to the launcher. If true
   // the bounds are modified to snap the window to the launcher.
   bool AttachToLauncher(gfx::Rect* bounds);
 
   // Tracks the panel's initial position and attachment at the start of a drag
   // and informs the PanelLayoutManager that a drag has started if necessary.
   void StartedDragging();
 
   // Informs the PanelLayoutManager that the drag is complete if it was informed
   // of the drag start.
   void FinishDragging();
 
+  // The owner of this resizer.
+  WindowResizerOwner* owner_;
+
   const Details details_;
 
   // Panel container window.
   aura::Window* panel_container_;
 
   // Weak pointer, owned by panel container.
   internal::PanelLayoutManager* panel_layout_manager_;
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
   // True if the window started attached to the launcher.
   const bool was_attached_;
 
   // True if the window should attach to the launcher after releasing.
   bool should_attach_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelWindowResizer);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_