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      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 ANDROID_WEBVIEW_BROWSER_RENDER_HOST_PRINT_MANAGER_H_
      6 #define ANDROID_WEBVIEW_BROWSER_RENDER_HOST_PRINT_MANAGER_H_
      7 
      8 #include "base/callback_forward.h"
      9 #include "base/threading/non_thread_safe.h"
     10 #include "content/public/browser/web_contents_observer.h"
     11 
     12 class GURL;
     13 
     14 namespace base {
     15 struct FileDescriptor;
     16 }
     17 
     18 namespace printing {
     19 class PrintSettings;
     20 }
     21 
     22 namespace android_webview {
     23 
     24 class PrintManagerDelegate {
     25  public:
     26   virtual ~PrintManagerDelegate() { }
     27   virtual void DidExportPdf(bool success) = 0;
     28   virtual bool IsCancelled() = 0;
     29 
     30  private:
     31   //  DISALLOW_COPY_AND_ASSIGN(PrintManagerDelegate);
     32 };
     33 
     34 // Provides RenderViewHost wrapper functionality for sending WebView-specific
     35 // IPC messages to the renderer and from there to WebKit.
     36 //
     37 // Note for android_webview:
     38 // This class manages the print (an export to PDF file essentially) task for
     39 // a webview. There can be at most one active print task per webview.
     40 class PrintManager : public content::WebContentsObserver,
     41                      public base::NonThreadSafe {
     42  public:
     43   // To send receive messages to a RenderView we take the WebContents instance,
     44   // as it internally handles RenderViewHost instances changing underneath us.
     45   PrintManager(content::WebContents* contents,
     46                printing::PrintSettings* settings,
     47                int fd,
     48                PrintManagerDelegate* delegate);
     49   virtual ~PrintManager();
     50 
     51   // Prints the current document immediately. Since the rendering is
     52   // asynchronous, the actual printing will not be completed on the return of
     53   // this function. Returns false if printing is impossible at the moment.
     54   //
     55   // Note for webview: Returns false immediately if this print manager is
     56   // already busy printing.
     57   bool PrintNow();
     58 
     59  private:
     60   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     61   void OnDidGetPrintedPagesCount(int cookie, int number_pages);
     62   void OnDidGetDocumentCookie(int cookie);
     63   void OnPrintingFailed(int cookie);
     64   void OnGetDefaultPrintSettingsReply(IPC::Message* reply_msg);
     65   void OnGetDefaultPrintSettings(IPC::Message* reply_msg);
     66   void OnAllocateTempFileForPrinting(base::FileDescriptor* temp_file_fd,
     67                                      int* sequence_number);
     68   void OnTempFileForPrintingWritten(int sequence_number);
     69 
     70   // Print Settings.
     71   printing::PrintSettings* settings_;
     72 
     73   // File descriptor to export to.
     74   int fd_;
     75   // Print manager delegate
     76   PrintManagerDelegate* delegate_;
     77   // Number of pages to print in the print job.
     78   int number_pages_;
     79   // The document cookie of the current PrinterQuery.
     80   int cookie_;
     81   // Whether a print task is pending.
     82   int printing_;
     83 
     84   DISALLOW_COPY_AND_ASSIGN(PrintManager);
     85 };
     86 
     87 }  // namespace android_webview
     88 
     89 #endif  // ANDROID_WEBVIEW_BROWSER_RENDER_HOST_PRINT_MANAGER_H_
     90