athena/wm/split_view_controller.h

   1 // Copyright 2014 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 ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
   6 #define ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
   7
   8 #include "athena/athena_export.h"
   9 #include "athena/wm/bezel_controller.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12
  13 namespace gfx {
  14 class Rect;
  15 class Transform;
  16 }
  17
  18 namespace athena {
  19 class WindowListProvider;
  20
  21 // Responsible for entering split view mode, exiting from split view mode, and
  22 // laying out the windows in split view mode.
  23 class ATHENA_EXPORT SplitViewController
  24     : public BezelController::ScrollDelegate {
  25  public:
  26   SplitViewController(aura::Window* container,
  27                       WindowListProvider* window_list_provider);
  28
  29   virtual ~SplitViewController();
  30
  31   bool IsSplitViewModeActive() const;
  32
  33   // Activates split-view mode with |left| and |right| windows. If |left| and/or
  34   // |right| is NULL, then the first window in the window-list (which is neither
  35   // |left| nor |right|) is selected instead.
  36   void ActivateSplitMode(aura::Window* left, aura::Window* right);
  37
  38   // Resets the internal state to an inactive state. Calling this does not
  39   // change the window bounds/transforms etc. The caller must take care of
  40   // making any necessary changes.
  41   void DeactivateSplitMode();
  42
  43   void ReplaceWindow(aura::Window* window,
  44                      aura::Window* replace_with);
  45
  46   // Returns the bounds that the left and right windows will have once split
  47   // view is active and they are done animating. If |left_window_| and
  48   // |right_window_| are still animating this may be different than their
  49   // current bounds.
  50   gfx::Rect GetLeftTargetBounds();
  51   gfx::Rect GetRightTargetBounds();
  52
  53   aura::Window* left_window() { return left_window_; }
  54   aura::Window* right_window() { return right_window_; }
  55
  56  private:
  57   enum State {
  58     // Split View mode is not active. |left_window_| and |right_window| are
  59     // NULL.
  60     INACTIVE,
  61     // Two windows |left_window_| and |right_window| are shown side by side and
  62     // there is a horizontal scroll in progress which is dragging the separator
  63     // between the two windows.
  64     SCROLLING,
  65     // Split View mode is active with |left_window_| and |right_window| showing
  66     // side by side each occupying half the screen. No scroll in progress.
  67     ACTIVE
  68   };
  69
  70   void UpdateLayout(bool animate);
  71
  72   void SetWindowTransform(aura::Window* left_window,
  73                           const gfx::Transform& transform,
  74                           bool animate);
  75
  76   void OnAnimationCompleted(aura::Window* window);
  77
  78   void UpdateSeparatorPositionFromScrollDelta(float delta);
  79
  80   // BezelController::ScrollDelegate:
  81   virtual void ScrollBegin(BezelController::Bezel bezel, float delta) OVERRIDE;
  82   virtual void ScrollEnd() OVERRIDE;
  83   virtual void ScrollUpdate(float delta) OVERRIDE;
  84   virtual bool CanScroll() OVERRIDE;
  85
  86   State state_;
  87
  88   aura::Window* container_;
  89
  90   // Provider of the list of windows to cycle through. Not owned.
  91   WindowListProvider* window_list_provider_;
  92
  93   // Windows for the left and right activities shown in SCROLLING and ACTIVE
  94   // states. In INACTIVE state these are NULL.
  95   aura::Window* left_window_;
  96   aura::Window* right_window_;
  97
  98   // Position of the separator between left_window_ and right_window_ in
  99   // container_ coordinates (along the x axis).
 100   int separator_position_;
 101
 102   base::WeakPtrFactory<SplitViewController> weak_factory_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(SplitViewController);
 105 };
 106
 107 }  // namespace athena
 108
 109 #endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_