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

athena/content/web_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_PUBLIC_WEB_ACTIVITY_H_
 #define ATHENA_CONTENT_PUBLIC_WEB_ACTIVITY_H_
 
 #include "athena/activity/public/activity.h"
 #include "athena/activity/public/activity_view_model.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace views {
 class WebView;
 class WidgetDelegate;
 }
 
 namespace athena {
 
 class AthenaWebView;
+class ContentProxy;
 
 class WebActivity : public Activity,
                     public ActivityViewModel,
                     public content::WebContentsObserver {
  public:
   WebActivity(content::BrowserContext* context,
               const base::string16& title,
               const GURL& gurl);
   WebActivity(AthenaWebView* web_view);
 
  protected:
   virtual ~WebActivity();
 
  // Activity:
   virtual athena::ActivityViewModel* GetActivityViewModel() OVERRIDE;
   virtual void SetCurrentState(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 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;
 
   // content::WebContentsObserver:
   virtual void TitleWasSet(content::NavigationEntry* entry,
                            bool explicit_set) OVERRIDE;
   virtual void DidUpdateFaviconURL(
       const std::vector<content::FaviconURL>& candidates) OVERRIDE;
   virtual void DidChangeThemeColor(SkColor theme_color) OVERRIDE;
 
  private:
-  // Make the content visible. This call should only be paired with
-  // MakeInvisible. Note: Upon object creation the content is visible.
-  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.
-  void MakeInvisible();
+  // Showing a content proxy instead of the real content to save resoruces.
+  void ShowContentProxy();
 
   // Reload the content if required, and start observing it.
   void ReloadAndObserve();
 
   content::BrowserContext* browser_context_;
   const base::string16 title_;
   const GURL url_;
   AthenaWebView* web_view_;
   SkColor title_color_;
 
   // The current state for this activity.
   ActivityState current_state_;
 
-  // The image which will be used in overview mode.
-  gfx::ImageSkia overview_mode_image_;
+  // The content proxy.
+  scoped_ptr<ContentProxy> content_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(WebActivity);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_CONTENT_WEB_ACTIVITY_H_