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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 ConstrainedPrintPreview dialog.
     26 // They get deleted when the printing finishes.
     27 class BackgroundPrintingManager : public base::NonThreadSafe,
     28                                   public content::NotificationObserver {
     29  public:
     30   typedef std::set<content::WebContents*> WebContentsSet;
     31 
     32   BackgroundPrintingManager();
     33   virtual ~BackgroundPrintingManager();
     34 
     35   // Takes ownership of |preview_dialog| and deletes it when |preview_dialog|
     36   // finishes printing. This removes |preview_dialog| from its ConstrainedDialog
     37   // and hides it from the user.
     38   void OwnPrintPreviewDialog(content::WebContents* preview_dialog);
     39 
     40   // Returns true if |printing_contents_set_| contains |preview_dialog|.
     41   bool HasPrintPreviewDialog(content::WebContents* preview_dialog);
     42 
     43   // Let others iterate over the list of background printing contents.
     44   WebContentsSet::const_iterator begin();
     45   WebContentsSet::const_iterator end();
     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   // Notifications handlers.
     54   void OnRendererProcessClosed(content::RenderProcessHost* rph);
     55   void OnPrintJobReleased(content::WebContents* preview_contents);
     56   void OnWebContentsDestroyed(content::WebContents* preview_contents);
     57 
     58   // Add |preview_contents| to the pending deletion set and schedule deletion.
     59   void DeletePreviewContents(content::WebContents* preview_contents);
     60 
     61   // Check if any of the WebContentses in |set| share a RenderProcessHost
     62   // with |tab|, excluding |tab|.
     63   bool HasSharedRenderProcessHost(const WebContentsSet& set,
     64                                   content::WebContents* preview_contents);
     65 
     66   // The set of print preview WebContentses managed by
     67   // BackgroundPrintingManager.
     68   WebContentsSet printing_contents_set_;
     69 
     70   // The set of print preview Webcontents managed by BackgroundPrintingManager
     71   // that are pending deletion.
     72   WebContentsSet printing_contents_pending_deletion_set_;
     73 
     74   content::NotificationRegistrar registrar_;
     75 
     76   DISALLOW_COPY_AND_ASSIGN(BackgroundPrintingManager);
     77 };
     78 
     79 }  // namespace printing
     80 
     81 #endif  // CHROME_BROWSER_PRINTING_BACKGROUND_PRINTING_MANAGER_H_
     82