Adding overview / layer framework to Activities so that unloaded / sleeping activities can be shown…

athena/content/app_activity.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_CONTENT_APP_ACTIVITY_H_
 #define ATHENA_CONTENT_APP_ACTIVITY_H_
 
 #include "athena/activity/public/activity.h"
 #include "athena/activity/public/activity_view_model.h"
+#include "athena/content/app_activity_proxy.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace views {
 class WebView;
 }
 
 namespace athena {
 
 class AppActivityRegistry;
+class ContentProxy;
 
 // The activity object for a hosted V2 application.
 class AppActivity : public Activity,
                     public ActivityViewModel,
                     public content::WebContentsObserver {
  public:
   explicit AppActivity(const std::string& app_id);
 
+  // Gets the content proxy so that the AppProxy can take it over.
+  scoped_ptr<ContentProxy> GetContentProxy(aura::Window* window);
+
   // Activity:
   virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
   virtual void SetCurrentState(Activity::ActivityState state) OVERRIDE;
   virtual ActivityState GetCurrentState() OVERRIDE;
   virtual bool IsVisible() OVERRIDE;
   virtual ActivityMediaState GetMediaState() OVERRIDE;
   virtual aura::Window* GetWindow() OVERRIDE;
 
   // ActivityViewModel:
   virtual void Init() OVERRIDE;
   virtual SkColor GetRepresentativeColor() const OVERRIDE;
   virtual base::string16 GetTitle() const OVERRIDE;
   virtual gfx::ImageSkia GetIcon() const OVERRIDE;
   virtual bool UsesFrame() const OVERRIDE;
   virtual views::View* GetContentsView() OVERRIDE;
-  virtual void CreateOverviewModeImage() OVERRIDE;
   virtual gfx::ImageSkia GetOverviewModeImage() OVERRIDE;
   virtual void PrepareContentsForOverview() OVERRIDE;
   virtual void ResetContentsView() OVERRIDE;
 
  protected:
   virtual ~AppActivity();
 
  // content::WebContentsObserver:
   virtual void TitleWasSet(content::NavigationEntry* entry,
                            bool explicit_set) OVERRIDE;
   virtual void DidUpdateFaviconURL(
       const std::vector<content::FaviconURL>& candidates) OVERRIDE;
 
   virtual views::WebView* GetWebView() = 0;
 
  private:
   // Register this activity with its application.
   void RegisterActivity();
 
-  // Make the content visible. This call should only be paired with
-  // MakeInvisible. Note: Upon start the content is visible.
-  // TODO(skuhne): If this can be combined with web_activity, move this into a
-  // separate class.
-  void MakeVisible();
+  // Hiding the contet proxy and showing the real content instead.
+  void HideContentProxy();
 
-  // Make the content invisible. This call should only be paired with
-  // MakeVisible.
-  // TODO(skuhne): If this can be combined with web_activity, move this into a
-  // separate class.
-  void MakeInvisible();
+  // Showing a content proxy instead of the real content to save resources.
+  void ShowContentProxy();
 
   const std::string app_id_;
 
   views::WebView* web_view_;
 
   // The current state for this activity.
   ActivityState current_state_;
 
-  // The image which will be used in overview mode.
-  gfx::ImageSkia overview_mode_image_;
-
   // If known the registry which holds all activities for the associated app.
   // This object is owned by |AppRegistry| and will be a valid pointer as long
   // as this object lives.
   AppActivityRegistry* app_activity_registry_;
 
+  // The content proxy.
+  scoped_ptr<ContentProxy> content_proxy_;
+
   DISALLOW_COPY_AND_ASSIGN(AppActivity);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_APP_ACTIVITY_H_