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: ~PrintManagerDelegate()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