chrome/browser/printing/print_view_manager_base.h

   1 // Copyright 2013 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_VIEW_MANAGER_BASE_H_
   6 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/prefs/pref_member.h"
  10 #include "base/strings/string16.h"
  11 #include "content/public/browser/notification_observer.h"
  12 #include "content/public/browser/notification_registrar.h"
  13 #include "content/public/browser/web_contents_observer.h"
  14 #include "content/public/browser/web_contents_user_data.h"
  15 #include "printing/printed_pages_source.h"
  16
  17 struct PrintHostMsg_DidPrintPage_Params;
  18
  19 namespace content {
  20 class RenderViewHost;
  21 }
  22
  23 namespace printing {
  24
  25 class JobEventDetails;
  26 class PrintJob;
  27 class PrintJobWorkerOwner;
  28 class PrintQueriesQueue;
  29
  30 // Base class for managing the print commands for a WebContents.
  31 class PrintViewManagerBase : public content::NotificationObserver,
  32                              public PrintedPagesSource,
  33                              public content::WebContentsObserver {
  34  public:
  35   virtual ~PrintViewManagerBase();
  36
  37   // Prints the current document immediately. Since the rendering is
  38   // asynchronous, the actual printing will not be completed on the return of
  39   // this function. Returns false if printing is impossible at the moment.
  40   virtual bool PrintNow();
  41
  42   // Whether to block scripted printing for our tab or not.
  43   void UpdateScriptedPrintingBlocked();
  44
  45   // PrintedPagesSource implementation.
  46   virtual base::string16 RenderSourceName() OVERRIDE;
  47
  48  protected:
  49   explicit PrintViewManagerBase(content::WebContents* web_contents);
  50
  51   // Helper method for Print*Now().
  52   bool PrintNowInternal(IPC::Message* message);
  53
  54   // Terminates or cancels the print job if one was pending.
  55   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
  56
  57   // content::WebContentsObserver implementation.
  58   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  59
  60   // IPC Message handlers.
  61   virtual void OnPrintingFailed(int cookie);
  62
  63  private:
  64   // content::NotificationObserver implementation.
  65   virtual void Observe(int type,
  66                        const content::NotificationSource& source,
  67                        const content::NotificationDetails& details) OVERRIDE;
  68
  69   // content::WebContentsObserver implementation.
  70   virtual void DidStartLoading(
  71       content::RenderViewHost* render_view_host) OVERRIDE;
  72
  73   // Cancels the print job.
  74   virtual void NavigationStopped() OVERRIDE;
  75
  76   // IPC Message handlers.
  77   void OnDidGetPrintedPagesCount(int cookie, int number_pages);
  78   void OnDidGetDocumentCookie(int cookie);
  79   void OnDidPrintPage(const PrintHostMsg_DidPrintPage_Params& params);
  80
  81   // Processes a NOTIFY_PRINT_JOB_EVENT notification.
  82   void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
  83
  84   // Requests the RenderView to render all the missing pages for the print job.
  85   // No-op if no print job is pending. Returns true if at least one page has
  86   // been requested to the renderer.
  87   bool RenderAllMissingPagesNow();
  88
  89   // Quits the current message loop if these conditions hold true: a document is
  90   // loaded and is complete and waiting_for_pages_to_be_rendered_ is true. This
  91   // function is called in DidPrintPage() or on ALL_PAGES_REQUESTED
  92   // notification. The inner message loop is created was created by
  93   // RenderAllMissingPagesNow().
  94   void ShouldQuitFromInnerMessageLoop();
  95
  96   // Creates a new empty print job. It has no settings loaded. If there is
  97   // currently a print job, safely disconnect from it. Returns false if it is
  98   // impossible to safely disconnect from the current print job or it is
  99   // impossible to create a new print job.
 100   bool CreateNewPrintJob(PrintJobWorkerOwner* job);
 101
 102   // Makes sure the current print_job_ has all its data before continuing, and
 103   // disconnect from it.
 104   void DisconnectFromCurrentPrintJob();
 105
 106   // Notify that the printing is done.
 107   void PrintingDone(bool success);
 108
 109   // Terminates the print job. No-op if no print job has been created. If
 110   // |cancel| is true, cancel it instead of waiting for the job to finish. Will
 111   // call ReleasePrintJob().
 112   void TerminatePrintJob(bool cancel);
 113
 114   // Releases print_job_. Correctly deregisters from notifications. No-op if
 115   // no print job has been created.
 116   void ReleasePrintJob();
 117
 118   // Runs an inner message loop. It will set inside_inner_message_loop_ to true
 119   // while the blocking inner message loop is running. This is useful in cases
 120   // where the RenderView is about to be destroyed while a printing job isn't
 121   // finished.
 122   bool RunInnerMessageLoop();
 123
 124   // In the case of Scripted Printing, where the renderer is controlling the
 125   // control flow, print_job_ is initialized whenever possible. No-op is
 126   // print_job_ is initialized.
 127   bool OpportunisticallyCreatePrintJob(int cookie);
 128
 129   // Release the PrinterQuery associated with our |cookie_|.
 130   void ReleasePrinterQuery();
 131
 132   content::NotificationRegistrar registrar_;
 133
 134   // Manages the low-level talk to the printer.
 135   scoped_refptr<PrintJob> print_job_;
 136
 137   // Number of pages to print in the print job.
 138   int number_pages_;
 139
 140   // Indication of success of the print job.
 141   bool printing_succeeded_;
 142
 143   // Running an inner message loop inside RenderAllMissingPagesNow(). This means
 144   // we are _blocking_ until all the necessary pages have been rendered or the
 145   // print settings are being loaded.
 146   bool inside_inner_message_loop_;
 147
 148 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 149   // Set to true when OnDidPrintPage() should be expecting the first page.
 150   bool expecting_first_page_;
 151 #endif
 152
 153   // The document cookie of the current PrinterQuery.
 154   int cookie_;
 155
 156   // Whether printing is enabled.
 157   BooleanPrefMember printing_enabled_;
 158
 159   scoped_refptr<printing::PrintQueriesQueue> queue_;
 160
 161   DISALLOW_COPY_AND_ASSIGN(PrintViewManagerBase);
 162 };
 163
 164 }  // namespace printing
 165
 166 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_BASE_H_