Windows docking should get triggered by pressing against the screen edge

ash/wm/dock/docked_window_resizer.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 ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
 #define ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
 
 #include "ash/wm/dock/dock_types.h"
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace gfx {
 class Point;
 class Rect;
 }
 
 namespace aura {
 class RootWindow;
 }
 
 namespace ash {
 namespace internal {
 
 class DockedWindowLayoutManager;
-class PhantomWindowController;
 
 // DockWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
 // moving or resizing of a window while it is docked to the side of a screen.
 class ASH_EXPORT DockedWindowResizer : public WindowResizer {
  public:
   virtual ~DockedWindowResizer();
 
   // Creates a new DockWindowResizer. 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.
@@ skipping 10 matching lines @@
   virtual aura::Window* GetTarget() OVERRIDE;
   virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
 
  private:
   // Creates DockWindowResizer that adds the ability to attach / detach
   // windows to / from the dock. This object takes ownership of
   // |next_window_resizer|.
   DockedWindowResizer(WindowResizer* next_window_resizer,
                       const Details& details);
 
-  // Returns the side of the screen that the window should dock to or
-  // DOCKED_ALIGNMENT_NONE when the window is not on a side or when some other
-  // windows are already docked on the other side or when launcher (shelf) is
-  // aligned on the same side.
-  DockedAlignment GetDraggedWindowAlignment();
-
   // Checks if the provided window bounds should snap to the side of a screen.
   // If so the offset returned gives the necessary adjustment to snap.
   bool MaybeSnapToEdge(const gfx::Rect& bounds, gfx::Point* offset);
 
   // Tracks the window's initial position and attachment at the start of a drag
   // and informs the DockLayoutManager that a drag has started if necessary.
   void StartedDragging();
 
   // Informs the DockLayoutManager that the drag is complete if it was informed
   // of the drag start.
   void FinishedDragging();
 
-  // Updates the bounds of the phantom window that is used as a docking hint.
-  void UpdateSnapPhantomWindow();
-
   const Details details_;
 
   gfx::Point last_location_;
 
   // Wraps a window resizer and adds detaching / reattaching during drags.
   scoped_ptr<WindowResizer> next_window_resizer_;
 
   // Dock container window.
   internal::DockedWindowLayoutManager* dock_layout_;
   internal::DockedWindowLayoutManager* initial_dock_layout_;
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
-  // Gives a preview of where the the window will end up.
-  scoped_ptr<PhantomWindowController> snap_phantom_window_controller_;
-
   // Set to true if the window that is being dragged was docked before drag.
   bool was_docked_;
 
   // True if the dragged window is docked during the drag.
   bool is_docked_;
 
   // If non-NULL the destructor sets this to true. Used to determine if this has
   // been deleted.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(DockedWindowResizer);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_