Split Screen mode implementation

athena/wm/split_view_controller.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
 #define ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
 
 #include "athena/wm/bezel_controller.h"
+#include "athena/wm/public/window_manager_observer.h"
+#include "athena/wm/window_overview_mode.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "ui/compositor/layer_animation_observer.h"

[Jun Mukai, 2014/08/06 20:49:01]

Is this include necessary here?

[mfomitchev, 2014/08/08 16:03:22]

Leftover from old code, thanks for catching. Fixed.

+
+namespace gfx {
+class Transform;
+}
+
+namespace wm {
+class WindowListProvider;
+}
 
 namespace athena {
+class WindowManager;
+class WindowOverviewModeDelegate;
 
 // Responsible for entering split view mode, exiting from split view mode, and
 // laying out the windows in split view mode.
-class SplitViewController : public BezelController::ScrollDelegate {
+class SplitViewController : public BezelController::ScrollDelegate,
+                            public WindowManagerObserver {
  public:
-  SplitViewController();
   virtual ~SplitViewController();

[oshima, 2014/08/06 21:54:09]

move dtor after ctor

[mfomitchev, 2014/08/08 16:03:23]

Done.

+  SplitViewController(aura::Window* container,
+                      wm::WindowListProvider* window_list_provider,
+                      WindowManager* window_manager);
+
+
+  bool IsSplitViewModeActive();
 
  private:
+  enum State {INACTIVE, SCROLLING, ACTIVE};

[oshima, 2014/08/06 21:54:09]

document these states. 

[mfomitchev, 2014/08/08 16:03:22]

Done.

+
+  void Layout(bool animate);
+
+  void SetWindowTransform(
+      aura::Window* window, const gfx::Transform& transform, bool animate);
+
+  void AnimationCompleted();

[oshima, 2014/08/06 21:54:10]

OnAnimationCompleted ( to be consistent with patterns used by other code)

[mfomitchev, 2014/08/08 16:03:23]

Done.

+
+  void UpdateSeparatorPositionFromScrollDelta(float delta);
+
+  aura::Window* GetCurrentWindow();

[oshima, 2014/08/06 21:54:09]

document what is *current* window. If it's active window, then you should use
wm::GetActiveWindow()

[mfomitchev, 2014/08/08 16:03:22]

I added comments. Unfortunately GetActiveWindow() may return a window which is
not an activity window. E.g. when you swipe up, it would return the home card
window. (Also, wm::GetActiveWIndow() is in ash, but we can use
aura::client::GetActivationClient(container_->GetRootWindow()) instead).

+
   // BezelController::ScrollDelegate overrides.
   virtual void ScrollBegin(BezelController::Bezel bezel, float delta) OVERRIDE;
   virtual void ScrollEnd() OVERRIDE;
   virtual void ScrollUpdate(float delta) OVERRIDE;
   virtual bool CanScroll() OVERRIDE;
 
+  // WindowManagerObserver overrides

[oshima, 2014/08/06 21:54:09]

// WindowManagerObserver:

(no "overrides" required now)

[mfomitchev, 2014/08/08 16:03:23]

Done.

+  virtual void OnOverviewModeEnter() OVERRIDE;
+  virtual void OnOverviewModeExit() OVERRIDE;
+
+  base::WeakPtrFactory<SplitViewController> weak_factory_;
+
+  State state_;
+
+  aura::Window* container_;
+  WindowManager* window_manager_;
+  wm::WindowListProvider* window_list_provider_;
+
+  aura::Window* current_window_;
+  aura::Window* left_window_;
+  aura::Window* right_window_;
+  // Position of the separator between left_window_ and right_window_ in

[oshima, 2014/08/06 21:54:09]

new line before comment

[mfomitchev, 2014/08/08 16:03:22]

Done.

+  // container_ coordinates (along the x axis).
+  int separator_position_;
+
   DISALLOW_COPY_AND_ASSIGN(SplitViewController);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_