ash/wm/panels/panel_window_resizer.h

   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   ~PanelWindowResizer() override;
  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   void Drag(const gfx::Point& location, int event_flags) override;
  34   void CompleteDrag() override;
  35   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_