Print Preview: Properly handle window.print().

chrome/browser/printing/print_view_manager.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_
 #define CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "content/browser/tab_contents/tab_contents_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "printing/printed_pages_source.h"
 
 class TabContentsWrapper;
 struct PrintHostMsg_DidPrintPage_Params;
 
+namespace content {
+class RenderProcessHost;
+}
+
 namespace printing {
 
 class JobEventDetails;
 class PrintJob;
 class PrintJobWorkerOwner;
 class PrintViewManagerObserver;
 
 // Manages the print commands in relation to a TabContents. TabContents
 // delegates a few printing related commands to this instance.
 class PrintViewManager : public content::NotificationObserver,
@@ skipping 16 matching lines @@
   // show the native system dialog. This can happen from both initiator tab and
   // preview tab.
   bool AdvancedPrintNow();
 
   // Initiate print preview of the current document by first notifying the
   // renderer. Since this happens asynchronous, the print preview tab creation
   // will not be completed on the return of this function. Returns false if
   // print preview is impossible at the moment.
   bool PrintPreviewNow();
 
+  // Notify PrintViewManager that print preview has finished. Unfreeze the
+  // renderer in the case of scripted print preview.
+  void PrintPreviewDone();
+
   // Handles cancelled preview printing request.
   void PreviewPrintingRequestCancelled();
 
   // Sets |observer| as the current PrintViewManagerObserver. Pass in NULL to
   // remove the current observer. |observer| may always be NULL, but |observer_|
   // must be NULL if |observer| is non-NULL.
   void set_observer(PrintViewManagerObserver* observer);
 
   // PrintedPagesSource implementation.
   virtual string16 RenderSourceName() OVERRIDE;
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // TabContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Terminates or cancels the print job if one was pending.
   virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
 
   // Cancels the print job.
   virtual void StopNavigation() OVERRIDE;
 
  private:
+  enum PrintPreviewState {
+    NOT_PREVIEWING,
+    USER_INITIATED_PREVIEW,
+    SCRIPTED_PREVIEW,
+  };
+
   // IPC Message handlers.
   void OnDidGetPrintedPagesCount(int cookie, int number_pages);
   void OnDidGetDocumentCookie(int cookie);
   void OnDidShowPrintDialog();
   void OnDidPrintPage(const PrintHostMsg_DidPrintPage_Params& params);
   void OnPrintingFailed(int cookie);
 
+  void OnScriptedPrintPreview(IPC::Message* reply_msg);
+  void OnScriptedPrintPreviewReply(IPC::Message* reply_msg);
+
   // Processes a NOTIFY_PRINT_JOB_EVENT notification.
   void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
 
   // Requests the RenderView to render all the missing pages for the print job.
   // No-op if no print job is pending. Returns true if at least one page has
   // been requested to the renderer.
   bool RenderAllMissingPagesNow();
 
   // Quits the current message loop if these conditions hold true: a document is
   // loaded and is complete and waiting_for_pages_to_be_rendered_ is true. This
@@ skipping 62 matching lines @@
   bool expecting_first_page_;
 #endif
 
   // Weak pointer to an observer that is notified when the print dialog is
   // shown.
   PrintViewManagerObserver* observer_;
 
   // The document cookie of the current PrinterQuery.
   int cookie_;
 
+  // Current state of print preview for this view.
+  PrintPreviewState print_preview_state_;
+
+  // Keeps track of the pending callback during scripted print preview.
+  content::RenderProcessHost* scripted_print_preview_rph_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintViewManager);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_VIEW_MANAGER_H_