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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_PRINTING_BACKGROUND_PRINTING_MANAGER_H_
      6 #define CHROME_BROWSER_PRINTING_BACKGROUND_PRINTING_MANAGER_H_
      7 
      8 #include <map>
      9 #include <set>
     10 
     11 #include "base/compiler_specific.h"
     12 #include "base/threading/non_thread_safe.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 
     16 namespace content {
     17 class RenderProcessHost;
     18 class WebContents;
     19 }
     20 
     21 namespace printing {
     22 
     23 // Manages hidden WebContents that prints documents in the background.
     24 // The hidden WebContents are no longer part of any Browser / TabStripModel.
     25 // The WebContents started life as a ConstrainedWebDialog.
     26 // They get deleted when the printing finishes.
     27 class BackgroundPrintingManager : public base::NonThreadSafe,
     28                                   public content::NotificationObserver {
     29  public:
     30   class Observer;
     31   typedef std::map<content::WebContents*, Observer*> WebContentsObserverMap;
     32 
     33   BackgroundPrintingManager();
     34   virtual ~BackgroundPrintingManager();
     35 
     36   // Takes ownership of |preview_dialog| and deletes it when |preview_dialog|
     37   // finishes printing. This removes |preview_dialog| from its ConstrainedDialog
     38   // and hides it from the user.
     39   void OwnPrintPreviewDialog(content::WebContents* preview_dialog);
     40 
     41   // Returns true if |printing_contents_map_| contains |preview_dialog|.
     42   bool HasPrintPreviewDialog(content::WebContents* preview_dialog);
     43 
     44   // Let others see the list of background printing contents.
     45   std::set<content::WebContents*> CurrentContentSet();
     46 
     47  private:
     48   // content::NotificationObserver overrides:
     49   virtual void Observe(int type,
     50                        const content::NotificationSource& source,
     51                        const content::NotificationDetails& details) OVERRIDE;
     52 
     53   // Schedule deletion of |preview_contents|.
     54   void DeletePreviewContents(content::WebContents* preview_contents);
     55 
     56   // A map from print preview WebContentses (managed by
     57   // BackgroundPrintingManager) to the Observers that observe them.
     58   WebContentsObserverMap printing_contents_map_;
     59 
     60   content::NotificationRegistrar registrar_;
     61 
     62   DISALLOW_COPY_AND_ASSIGN(BackgroundPrintingManager);
     63 };
     64 
     65 }  // namespace printing
     66 
     67 #endif  // CHROME_BROWSER_PRINTING_BACKGROUND_PRINTING_MANAGER_H_
     68