Move the concept of Activation to the Shell.

ui/aura_shell/workspace_controller.cc

 // Copyright (c) 2011 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 "ui/aura_shell/workspace_controller.h"
 
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/default_container_layout_manager.h"
 #include "ui/aura_shell/launcher/launcher.h"
 #include "ui/aura_shell/launcher/launcher_model.h"
 #include "ui/aura_shell/shell.h"
+#include "ui/aura_shell/window_util.h"
 #include "ui/aura_shell/workspace/workspace.h"
 #include "ui/aura_shell/workspace/workspace_manager.h"
 
 namespace aura_shell {
 namespace internal {
 
 WorkspaceController::WorkspaceController(aura::Window* viewport)
     : workspace_manager_(new WorkspaceManager(viewport)),
       launcher_model_(NULL),
       ignore_move_event_(false) {
   workspace_manager_->AddObserver(this);
+  aura::RootWindow::GetInstance()->AddRootWindowObserver(this);
   aura::RootWindow::GetInstance()->AddObserver(this);
 }
 
 WorkspaceController::~WorkspaceController() {
   workspace_manager_->RemoveObserver(this);
   if (launcher_model_)
     launcher_model_->RemoveObserver(this);
   aura::RootWindow::GetInstance()->RemoveObserver(this);
+  aura::RootWindow::GetInstance()->RemoveRootWindowObserver(this);
 }
 
 void WorkspaceController::ToggleOverview() {
   workspace_manager_->SetOverview(!workspace_manager_->is_overview());
 }
 
 void WorkspaceController::SetLauncherModel(LauncherModel* launcher_model) {
   DCHECK(!launcher_model_);
   launcher_model_ = launcher_model;
   launcher_model_->AddObserver(this);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WorkspaceController, aura::RootWindowObserver overrides:
 
 void WorkspaceController::OnRootWindowResized(const gfx::Size& new_size) {
   workspace_manager_->SetWorkspaceSize(new_size);
 }
 
-void WorkspaceController::OnActiveWindowChanged(aura::Window* active) {
-  // FindBy handles NULL.
-  Workspace* workspace = workspace_manager_->FindBy(active);
-  if (workspace)
-    workspace->Activate();
+////////////////////////////////////////////////////////////////////////////////
+// WorkspaceController, aura::WindowObserver overrides:
+
+void WorkspaceController::OnWindowPropertyChanged(aura::Window* window,
+                                                  const char* key,
+                                                  void* old) {
+  if (key == aura::kRootWindowActiveWindow) {
+    // FindBy handles NULL.
+    Workspace* workspace = workspace_manager_->FindBy(GetActiveWindow());
+    if (workspace)
+      workspace->Activate();
+  }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WorkspaceController, aura_shell::internal::WorkspaceObserver overrides:
 
 void WorkspaceController::WindowMoved(WorkspaceManager* manager,
                                       aura::Window* source,
                                       aura::Window* target) {
   if (ignore_move_event_ || !launcher_model_)
     return;
@@ skipping 40 matching lines @@
   ignore_move_event_ = true;
   workspace_manager_->RotateWindows(start, target);
   ignore_move_event_ = false;
 }
 
 void WorkspaceController::LauncherItemImagesChanged(int index) {
 }
 
 }  // namespace internal
 }  // namespace aura_shell