Stick windows to sides of workspaces

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;
 class Point;
 }
 
+namespace aura {
+class RootWindow;
+}
+
 namespace ash {
 
 // 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. The ownership of |next_window_resizer| is taken by the
   // returned object. Returns NULL if not resizable.
   static PanelWindowResizer* Create(WindowResizer* next_window_resizer,
                                     aura::Window* window,
                                     const gfx::Point& location,
                                     int window_component);
 
-  // WindowResizer overides:
+  // WindowResizer:
   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:
@@ skipping 14 matching lines @@
 
   // Informs the PanelLayoutManager that the drag is complete if it was informed
   // of the drag start.
   void FinishDragging();
 
   // Updates the dragged panel's index in the launcher.
   void UpdateLauncherPosition();
 
   const Details details_;
 
+  gfx::Point last_mouse_location_;
+
   // Wraps a window resizer and adds panel detaching / reattaching and snapping
   // to launcher behavior during drags.
   scoped_ptr<WindowResizer> next_window_resizer_;
 
   // Panel container window.
   aura::Window* panel_container_;
 
+  // Cached root window when drag started
+  aura::RootWindow* root_window_;
+
   // 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_;
 
   // If non-NULL the destructor sets this to true. Used to determine if this has
   // been deleted.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelWindowResizer);
 };
 
-}  // namespace aura
+}  // namespace ash
 
 #endif  // ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_