android_webview/browser/renderer_host/print_manager.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 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_