ash/wm/dock/docked_window_resizer.h

   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/dock/dock_types.h"
   9 #include "ash/wm/window_resizer.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13
  14 namespace gfx {
  15 class Point;
  16 class Rect;
  17 }
  18
  19 namespace aura {
  20 class RootWindow;
  21 }
  22
  23 namespace ash {
  24 class DockedWindowLayoutManager;
  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   ~DockedWindowResizer() override;
  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                                      wm::WindowState* window_state);
  37
  38   // WindowResizer:
  39   void Drag(const gfx::Point& location, int event_flags) override;
  40   void CompleteDrag() override;
  41   void RevertDrag() override;
  42
  43  private:
  44   // Creates DockWindowResizer that adds the ability to attach / detach
  45   // windows to / from the dock. This object takes ownership of
  46   // |next_window_resizer|.
  47   DockedWindowResizer(WindowResizer* next_window_resizer,
  48                       wm::WindowState* window_state);
  49
  50   // If the provided window bounds should snap to the side of a screen,
  51   // returns the offset that gives the necessary adjustment to snap.
  52   void MaybeSnapToEdge(const gfx::Rect& bounds, gfx::Point* offset);
  53
  54   // Tracks the window's initial position and attachment at the start of a drag
  55   // and informs the DockLayoutManager that a drag has started if necessary.
  56   void StartedDragging();
  57
  58   // Informs the DockLayoutManager that the drag is complete if it was informed
  59   // of the drag start. |move_result| specifies if the drag was completed or
  60   // reverted.
  61   void FinishedDragging(aura::client::WindowMoveResult move_result);
  62
  63   // Reparents dragged window as necessary to the docked container or back to
  64   // workspace at the end of the drag. Calculates and returns action taken that
  65   // can be reported in UMA stats. |is_resized| reports if the window is merely
  66   // being resized rather than repositioned. |attached_panel| is necessary to
  67   // avoid docking panels that have been attached to the launcher shelf at the
  68   // end of the drag.
  69   DockedAction MaybeReparentWindowOnDragCompletion(bool is_resized,
  70                                                    bool is_attached_panel);
  71
  72   gfx::Point last_location_;
  73
  74   // Wraps a window resizer and adds detaching / reattaching during drags.
  75   scoped_ptr<WindowResizer> next_window_resizer_;
  76
  77   // Dock container window.
  78   DockedWindowLayoutManager* dock_layout_;
  79   DockedWindowLayoutManager* initial_dock_layout_;
  80
  81   // Set to true once Drag() is invoked and the bounds of the window change.
  82   bool did_move_or_resize_;
  83
  84   // Set to true if the window that is being dragged was docked before drag.
  85   bool was_docked_;
  86
  87   // True if the dragged window is docked during the drag.
  88   bool is_docked_;
  89
  90   // True if the dragged window had |bounds_changed_by_user| before the drag.
  91   // Cleared whenever the target window gets dragged outside of the docked area.
  92   bool was_bounds_changed_by_user_;
  93
  94   base::WeakPtrFactory<DockedWindowResizer> weak_ptr_factory_;
  95
  96   DISALLOW_COPY_AND_ASSIGN(DockedWindowResizer);
  97 };
  98
  99 }  // namespace ash
 100
 101 #endif  // ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_