1 // Copyright (c) 2011 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_PRINTER_QUERY_H_ 6 #define CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_ 7 #pragma once 8 9 #include "base/memory/scoped_ptr.h" 10 #include "chrome/browser/printing/print_job_worker_owner.h" 11 #include "ui/gfx/native_widget_types.h" 12 13 class CancelableTask; 14 class DictionaryValue; 15 class MessageLoop; 16 17 namespace base { 18 class Thread; 19 } 20 21 namespace printing { 22 23 class PrintJobWorker; 24 25 // Query the printer for settings. 26 class PrinterQuery : public PrintJobWorkerOwner { 27 public: 28 // GetSettings() UI parameter. 29 enum GetSettingsAskParam { 30 DEFAULTS, 31 ASK_USER, 32 }; 33 34 PrinterQuery(); 35 36 // PrintJobWorkerOwner 37 virtual void GetSettingsDone(const PrintSettings& new_settings, 38 PrintingContext::Result result); 39 virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner); 40 virtual MessageLoop* message_loop(); 41 virtual const PrintSettings& settings() const; 42 virtual int cookie() const; 43 44 // Initializes the printing context. It is fine to call this function multiple 45 // times to reinitialize the settings. |parent_view| parameter's window will 46 // be the owner of the print setting dialog box. It is unused when 47 // |ask_for_user_settings| is DEFAULTS. 48 void GetSettings(GetSettingsAskParam ask_user_for_settings, 49 gfx::NativeView parent_view, 50 int expected_page_count, 51 bool has_selection, 52 bool use_overlays, 53 CancelableTask* callback); 54 55 // Updates the current settings with |new_settings| dictionary values. 56 void SetSettings(const DictionaryValue& new_settings, 57 CancelableTask* callback); 58 59 // Stops the worker thread since the client is done with this object. 60 void StopWorker(); 61 62 // Returns true if a GetSettings() call is pending completion. 63 bool is_callback_pending() const; 64 65 PrintingContext::Result last_status() const { return last_status_; } 66 67 // Returns if a worker thread is still associated to this instance. 68 bool is_valid() const; 69 70 private: 71 virtual ~PrinterQuery(); 72 73 // Lazy create the worker thread. There is one worker thread per print job. 74 // Returns true, if worker thread exists or has been created. 75 bool StartWorker(CancelableTask* callback); 76 77 // Main message loop reference. Used to send notifications in the right 78 // thread. 79 MessageLoop* const io_message_loop_; 80 81 // All the UI is done in a worker thread because many Win32 print functions 82 // are blocking and enters a message loop without your consent. There is one 83 // worker thread per print job. 84 scoped_ptr<PrintJobWorker> worker_; 85 86 // Cache of the print context settings for access in the UI thread. 87 PrintSettings settings_; 88 89 // Is the Print... dialog box currently shown. 90 bool is_print_dialog_box_shown_; 91 92 // Cookie that make this instance unique. 93 int cookie_; 94 95 // Results from the last GetSettingsDone() callback. 96 PrintingContext::Result last_status_; 97 98 // Task waiting to be executed. 99 scoped_ptr<CancelableTask> callback_; 100 101 DISALLOW_COPY_AND_ASSIGN(PrinterQuery); 102 }; 103 104 } // namespace printing 105 106 #endif // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_ 107