Split Screen mode implementation

athena/wm/window_manager_impl.cc

 // 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.
 
 #include "athena/wm/public/window_manager.h"
 
 #include "athena/common/container_priorities.h"
 #include "athena/input/public/accelerator_manager.h"
 #include "athena/screen/public/screen_manager.h"
 #include "athena/wm/bezel_controller.h"
+#include "athena/wm/mru_window_tracker.h"
 #include "athena/wm/public/window_manager_observer.h"
 #include "athena/wm/split_view_controller.h"
 #include "athena/wm/window_overview_mode.h"
 #include "base/logging.h"
 #include "base/observer_list.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/wm/core/window_util.h"
 #include "ui/wm/public/window_types.h"
 
 namespace athena {
 namespace {
 
 class WindowManagerImpl : public WindowManager,
                           public WindowOverviewModeDelegate,
                           public aura::WindowObserver,
                           public AcceleratorHandler {
  public:
   WindowManagerImpl();
   virtual ~WindowManagerImpl();
 
   void Layout();
 
   // WindowManager:
   virtual void ToggleOverview() OVERRIDE;
 
+  virtual bool IsOverviewModeActive() OVERRIDE {
+    return overview_;
+  }
+
  private:
   enum Command {
     COMMAND_TOGGLE_OVERVIEW,
   };
 
   // Sets whether overview mode is active.
   void SetInOverview(bool active);
 
   void InstallAccelerators();
 
   // WindowManager:
   virtual void AddObserver(WindowManagerObserver* observer) OVERRIDE;
   virtual void RemoveObserver(WindowManagerObserver* observer) OVERRIDE;
 
   // WindowOverviewModeDelegate:
   virtual void OnSelectWindow(aura::Window* window) OVERRIDE;
 
   // aura::WindowObserver
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // AcceleratorHandler:
   virtual bool IsCommandEnabled(int command_id) const OVERRIDE;
   virtual bool OnAcceleratorFired(int command_id,
                                   const ui::Accelerator& accelerator) OVERRIDE;
 
   scoped_ptr<aura::Window> container_;
+  scoped_ptr<MruWindowTracker> mru_window_tracker_;
   scoped_ptr<WindowOverviewMode> overview_;
   scoped_ptr<BezelController> bezel_controller_;
   scoped_ptr<SplitViewController> split_view_controller_;
   ObserverList<WindowManagerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
 };
 
 class AthenaContainerLayoutManager : public aura::LayoutManager {
  public:
@@ skipping 15 matching lines @@
 };
 
 class WindowManagerImpl* instance = NULL;
 
 WindowManagerImpl::WindowManagerImpl() {
   ScreenManager::ContainerParams params("DefaultContainer", CP_DEFAULT);
   params.can_activate_children = true;
   container_.reset(ScreenManager::Get()->CreateDefaultContainer(params));
   container_->SetLayoutManager(new AthenaContainerLayoutManager);
   container_->AddObserver(this);
+  mru_window_tracker_.reset(new MruWindowTracker(container_.get()));
   bezel_controller_.reset(new BezelController(container_.get()));
-  split_view_controller_.reset(new SplitViewController());
+  split_view_controller_.reset(new SplitViewController(
+      container_.get(), mru_window_tracker_.get(), this));
   bezel_controller_->set_left_right_delegate(split_view_controller_.get());
   container_->AddPreTargetHandler(bezel_controller_.get());
   instance = this;
   InstallAccelerators();
 }
 
 WindowManagerImpl::~WindowManagerImpl() {
   overview_.reset();
   if (container_) {
     container_->RemoveObserver(this);
@@ skipping 21 matching lines @@
 void WindowManagerImpl::ToggleOverview() {
   SetInOverview(overview_.get() == NULL);
 }
 
 void WindowManagerImpl::SetInOverview(bool active) {
   bool in_overview = !!overview_;
   if (active == in_overview)
     return;
 
   if (active) {
-    overview_ = WindowOverviewMode::Create(container_.get(), this);
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
                       OnOverviewModeEnter());
+    // Re-stack all windows in the order defined by mru_window_tracker_.
+    aura::Window::Windows window_list = mru_window_tracker_->GetWindowList();
+    aura::Window::Windows::iterator it;
+    for (it = window_list.begin(); it != window_list.end(); ++it) {
+      container_->StackChildAtTop(*it);
+    }
+    overview_ =
+        WindowOverviewMode::Create(container_.get(),
+                                   mru_window_tracker_->GetWindowList(),
+                                   this);
   } else {
     overview_.reset();
     FOR_EACH_OBSERVER(WindowManagerObserver, observers_,
                       OnOverviewModeExit());
   }
 }
 
 void WindowManagerImpl::InstallAccelerators() {
   const AcceleratorData accelerator_data[] = {
       {TRIGGER_ON_PRESS, ui::VKEY_F6, ui::EF_NONE, COMMAND_TOGGLE_OVERVIEW,
        AF_NONE},
   };
   AcceleratorManager::Get()->RegisterAccelerators(
       accelerator_data, arraysize(accelerator_data), this);
 }
 
 void WindowManagerImpl::AddObserver(WindowManagerObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void WindowManagerImpl::RemoveObserver(WindowManagerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void WindowManagerImpl::OnSelectWindow(aura::Window* window) {
-  CHECK_EQ(container_.get(), window->parent());
-  container_->StackChildAtTop(window);
+  mru_window_tracker_->MoveToFront(window);
   wm::ActivateWindow(window);
   SetInOverview(false);
 }
 
 void WindowManagerImpl::OnWindowDestroying(aura::Window* window) {
   if (window == container_)
     container_.reset();
 }
 
 bool WindowManagerImpl::IsCommandEnabled(int command_id) const {
@@ skipping 63 matching lines @@
   DCHECK(!instance);
 }
 
 // static
 WindowManager* WindowManager::GetInstance() {
   DCHECK(instance);
   return instance;
 }
 
 }  // namespace athena