chrome/browser/printing/print_preview_dialog_controller.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_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
   6 #define CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_
   7
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "components/sessions/session_id.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16
  17 class GURL;
  18
  19 namespace content {
  20 struct LoadCommittedDetails;
  21 class RenderProcessHost;
  22 class WebContents;
  23 }
  24
  25 namespace printing {
  26
  27 // For print preview, the WebContents that initiates the printing operation is
  28 // the initiator, and the constrained dialog that shows the print preview is the
  29 // print preview dialog.
  30 // This class manages print preview dialog creation and destruction, and keeps
  31 // track of the 1:1 relationship between initiator tabs and print preview
  32 // dialogs.
  33 class PrintPreviewDialogController
  34     : public base::RefCounted<PrintPreviewDialogController>,
  35       public content::NotificationObserver {
  36  public:
  37   PrintPreviewDialogController();
  38
  39   static PrintPreviewDialogController* GetInstance();
  40
  41   // Initiate print preview for |initiator|.
  42   // Call this instead of GetOrCreatePreviewDialog().
  43   static void PrintPreview(content::WebContents* initiator);
  44
  45   // Get/Create the print preview dialog for |initiator|.
  46   // Exposed for unit tests.
  47   content::WebContents* GetOrCreatePreviewDialog(
  48       content::WebContents* initiator);
  49
  50   // Returns the preview dialog for |contents|.
  51   // Returns |contents| if |contents| is a preview dialog.
  52   // Returns NULL if no preview dialog exists for |contents|.
  53   content::WebContents* GetPrintPreviewForContents(
  54       content::WebContents* contents) const;
  55
  56   // Returns the initiator for |preview_dialog|.
  57   // Returns NULL if no initiator exists for |preview_dialog|.
  58   content::WebContents* GetInitiator(content::WebContents* preview_dialog);
  59
  60   // Run |callback| on the dialog of each active print preview operation.
  61   void ForEachPreviewDialog(
  62       base::Callback<void(content::WebContents*)> callback);
  63
  64   // content::NotificationObserver implementation.
  65   void Observe(int type,
  66                const content::NotificationSource& source,
  67                const content::NotificationDetails& details) override;
  68
  69   // Returns true if |contents| is a print preview dialog.
  70   static bool IsPrintPreviewDialog(content::WebContents* contents);
  71
  72   // Returns true if |url| is a print preview url.
  73   static bool IsPrintPreviewURL(const GURL& url);
  74
  75   // Erase the initiator info associated with |preview_dialog|.
  76   void EraseInitiatorInfo(content::WebContents* preview_dialog);
  77
  78   bool is_creating_print_preview_dialog() const {
  79     return is_creating_print_preview_dialog_;
  80   }
  81
  82  private:
  83   friend class base::RefCounted<PrintPreviewDialogController>;
  84
  85   // 1:1 relationship between a print preview dialog and its initiator tab.
  86   // Key: Print preview dialog.
  87   // Value: Initiator.
  88   using PrintPreviewDialogMap =
  89       std::map<content::WebContents*, content::WebContents*>;
  90
  91   ~PrintPreviewDialogController() override;
  92
  93   // Handler for the RENDERER_PROCESS_CLOSED notification. This is observed when
  94   // the initiator renderer crashed.
  95   void OnRendererProcessClosed(content::RenderProcessHost* rph);
  96
  97   // Handler for the WEB_CONTENTS_DESTROYED notification. This is observed when
  98   // either WebContents is closed.
  99   void OnWebContentsDestroyed(content::WebContents* contents);
 100
 101   // Handler for the NAV_ENTRY_COMMITTED notification. This is observed when the
 102   // renderer is navigated to a different page.
 103   void OnNavEntryCommitted(content::WebContents* contents,
 104                            content::LoadCommittedDetails* details);
 105
 106   // Creates a new print preview dialog.
 107   content::WebContents* CreatePrintPreviewDialog(
 108       content::WebContents* initiator);
 109
 110   // Helper function to store the title of the initiator associated with
 111   // |preview_dialog| in |preview_dialog|'s PrintPreviewUI.
 112   void SaveInitiatorTitle(content::WebContents* preview_dialog);
 113
 114   // Adds/Removes observers for notifications from |contents|.
 115   void AddObservers(content::WebContents* contents);
 116   void RemoveObservers(content::WebContents* contents);
 117
 118   // Removes WebContents when they close/crash/navigate.
 119   void RemoveInitiator(content::WebContents* initiator);
 120   void RemovePreviewDialog(content::WebContents* preview_dialog);
 121
 122   // Mapping between print preview dialog and the corresponding initiator.
 123   PrintPreviewDialogMap preview_dialog_map_;
 124
 125   // A registrar for listening to notifications.
 126   content::NotificationRegistrar registrar_;
 127
 128   // True if the controller is waiting for a new preview dialog via
 129   // content::NAVIGATION_TYPE_NEW_PAGE.
 130   bool waiting_for_new_preview_page_;
 131
 132   // Whether the PrintPreviewDialogController is in the middle of creating a
 133   // print preview dialog.
 134   bool is_creating_print_preview_dialog_;
 135
 136   DISALLOW_COPY_AND_ASSIGN(PrintPreviewDialogController);
 137 };
 138
 139 }  // namespace printing
 140
 141 #endif  // CHROME_BROWSER_PRINTING_PRINT_PREVIEW_DIALOG_CONTROLLER_H_