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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
      6 #define ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
      7 
      8 #include "ash/wm/window_resizer.h"
      9 #include "base/compiler_specific.h"
     10 
     11 namespace gfx {
     12 class Point;
     13 class Rect;
     14 }
     15 
     16 namespace aura {
     17 class RootWindow;
     18 }
     19 
     20 namespace ash {
     21 
     22 namespace internal {
     23 class DockedWindowLayoutManager;
     24 }
     25 
     26 // DockWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
     27 // moving or resizing of a window while it is docked to the side of a screen.
     28 class ASH_EXPORT DockedWindowResizer : public WindowResizer {
     29  public:
     30   virtual ~DockedWindowResizer();
     31 
     32   // Creates a new DockWindowResizer. The caller takes ownership of the
     33   // returned object. The ownership of |next_window_resizer| is taken by the
     34   // returned object. Returns NULL if not resizable.
     35   static DockedWindowResizer* Create(WindowResizer* next_window_resizer,
     36                                      aura::Window* window,
     37                                      const gfx::Point& location,
     38                                      int window_component,
     39                                      aura::client::WindowMoveSource source);
     40 
     41   // WindowResizer:
     42   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
     43   virtual void CompleteDrag(int event_flags) OVERRIDE;
     44   virtual void RevertDrag() OVERRIDE;
     45   virtual aura::Window* GetTarget() OVERRIDE;
     46   virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
     47 
     48  private:
     49   // Creates DockWindowResizer that adds the ability to attach / detach
     50   // windows to / from the dock. This object takes ownership of
     51   // |next_window_resizer|.
     52   DockedWindowResizer(WindowResizer* next_window_resizer,
     53                       const Details& details);
     54 
     55   // Checks if the provided window bounds should snap to the side of a screen.
     56   // If so the offset returned gives the necessary adjustment to snap.
     57   bool MaybeSnapToEdge(const gfx::Rect& bounds, gfx::Point* offset);
     58 
     59   // Tracks the window's initial position and attachment at the start of a drag
     60   // and informs the DockLayoutManager that a drag has started if necessary.
     61   void StartedDragging();
     62 
     63   // Informs the DockLayoutManager that the drag is complete if it was informed
     64   // of the drag start.
     65   void FinishDragging();
     66 
     67   const Details details_;
     68 
     69   gfx::Point last_location_;
     70 
     71   // Wraps a window resizer and adds detaching / reattaching during drags.
     72   scoped_ptr<WindowResizer> next_window_resizer_;
     73 
     74   // Dock container window.
     75   internal::DockedWindowLayoutManager* dock_layout_;
     76 
     77   // Set to true once Drag() is invoked and the bounds of the window change.
     78   bool did_move_or_resize_;
     79 
     80   // Set to true if the window that is being dragged was docked before drag.
     81   bool was_docked_;
     82 
     83   // If non-NULL the destructor sets this to true. Used to determine if this has
     84   // been deleted.
     85   bool* destroyed_;
     86 
     87   DISALLOW_COPY_AND_ASSIGN(DockedWindowResizer);
     88 };
     89 
     90 }  // namespace ash
     91 
     92 #endif  // ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
     93