chrome/browser/printing/background_printing_manager.h

   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   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_