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      1 // Copyright (c) 2012 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_PANELS_PANEL_WINDOW_RESIZER_H_
      6 #define ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
      7 
      8 #include "ash/wm/window_resizer.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/weak_ptr.h"
     11 
     12 namespace gfx {
     13 class Rect;
     14 class Point;
     15 }
     16 
     17 namespace ash {
     18 
     19 // PanelWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
     20 // moving or resizing panel window. These can be attached and detached from the
     21 // launcher.
     22 class ASH_EXPORT PanelWindowResizer : public WindowResizer {
     23  public:
     24   virtual ~PanelWindowResizer();
     25 
     26   // Creates a new PanelWindowResizer. The caller takes ownership of the
     27   // returned object. The ownership of |next_window_resizer| is taken by the
     28   // returned object. Returns NULL if not resizable.
     29   static PanelWindowResizer* Create(WindowResizer* next_window_resizer,
     30                                     wm::WindowState* window_state);
     31 
     32   // WindowResizer:
     33   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
     34   virtual void CompleteDrag() OVERRIDE;
     35   virtual void RevertDrag() OVERRIDE;
     36 
     37  private:
     38   // Creates PanelWindowResizer that adds the ability to attach / detach panel
     39   // windows as well as reparenting them to the panel layer while dragging to
     40   // |next_window_resizer|. This object takes ownership of
     41   // |next_window_resizer|.
     42   PanelWindowResizer(WindowResizer* next_window_resizer,
     43                      wm::WindowState* window_state);
     44 
     45   // Checks if the provided window bounds should attach to the launcher. If true
     46   // the offset gives the necessary adjustment to snap to the launcher.
     47   bool AttachToLauncher(const gfx::Rect& bounds, gfx::Point* offset);
     48 
     49   // Tracks the panel's initial position and attachment at the start of a drag
     50   // and informs the PanelLayoutManager that a drag has started if necessary.
     51   void StartedDragging();
     52 
     53   // Informs the PanelLayoutManager that the drag is complete if it was informed
     54   // of the drag start.
     55   void FinishDragging();
     56 
     57   // Updates the dragged panel's index in the launcher.
     58   void UpdateLauncherPosition();
     59 
     60   // Last pointer location in screen coordinates.
     61   gfx::Point last_location_;
     62 
     63   // Wraps a window resizer and adds panel detaching / reattaching and snapping
     64   // to launcher behavior during drags.
     65   scoped_ptr<WindowResizer> next_window_resizer_;
     66 
     67   // Panel container window.
     68   aura::Window* panel_container_;
     69   aura::Window* initial_panel_container_;
     70 
     71   // Set to true once Drag() is invoked and the bounds of the window change.
     72   bool did_move_or_resize_;
     73 
     74   // True if the window started attached to the launcher.
     75   const bool was_attached_;
     76 
     77   base::WeakPtrFactory<PanelWindowResizer> weak_ptr_factory_;
     78 
     79   DISALLOW_COPY_AND_ASSIGN(PanelWindowResizer);
     80 };
     81 
     82 }  // namespace ash
     83 
     84 #endif  // ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
     85