chrome/browser/printing/printer_query.h

   1 // Copyright (c) 2012 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
   8 #include "base/callback.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "chrome/browser/printing/print_job_worker_owner.h"
  12 #include "printing/print_job_constants.h"
  13
  14 namespace base {
  15 class DictionaryValue;
  16 }
  17
  18 namespace printing {
  19
  20 class PrintDestinationInterface;
  21 class PrintJobWorker;
  22
  23 // Query the printer for settings.
  24 class PrinterQuery : public PrintJobWorkerOwner {
  25  public:
  26   // GetSettings() UI parameter.
  27   enum GetSettingsAskParam {
  28     DEFAULTS,
  29     ASK_USER,
  30   };
  31
  32   PrinterQuery(int render_process_id, int render_view_id);
  33
  34   // PrintJobWorkerOwner implementation.
  35   void GetSettingsDone(const PrintSettings& new_settings,
  36                        PrintingContext::Result result) override;
  37   PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner) override;
  38   const PrintSettings& settings() const override;
  39   int cookie() const override;
  40
  41   // Initializes the printing context. It is fine to call this function multiple
  42   // times to reinitialize the settings. |web_contents_observer| can be queried
  43   // to find the owner of the print setting dialog box. It is unused when
  44   // |ask_for_user_settings| is DEFAULTS.
  45   void GetSettings(
  46       GetSettingsAskParam ask_user_for_settings,
  47       int expected_page_count,
  48       bool has_selection,
  49       MarginType margin_type,
  50       const base::Closure& callback);
  51
  52   // Updates the current settings with |new_settings| dictionary values.
  53   void SetSettings(scoped_ptr<base::DictionaryValue> new_settings,
  54                    const base::Closure& callback);
  55
  56   // Stops the worker thread since the client is done with this object.
  57   void StopWorker();
  58
  59   // Returns true if a GetSettings() call is pending completion.
  60   bool is_callback_pending() const;
  61
  62   PrintingContext::Result last_status() const { return last_status_; }
  63
  64   // Returns if a worker thread is still associated to this instance.
  65   bool is_valid() const;
  66
  67  private:
  68   ~PrinterQuery() override;
  69
  70   // Lazy create the worker thread. There is one worker thread per print job.
  71   void StartWorker(const base::Closure& callback);
  72
  73   // All the UI is done in a worker thread because many Win32 print functions
  74   // are blocking and enters a message loop without your consent. There is one
  75   // worker thread per print job.
  76   scoped_ptr<PrintJobWorker> worker_;
  77
  78   // Cache of the print context settings for access in the UI thread.
  79   PrintSettings settings_;
  80
  81   // Is the Print... dialog box currently shown.
  82   bool is_print_dialog_box_shown_;
  83
  84   // Cookie that make this instance unique.
  85   int cookie_;
  86
  87   // Results from the last GetSettingsDone() callback.
  88   PrintingContext::Result last_status_;
  89
  90   // Callback waiting to be run.
  91   base::Closure callback_;
  92
  93   DISALLOW_COPY_AND_ASSIGN(PrinterQuery);
  94 };
  95
  96 }  // namespace printing
  97
  98 #endif  // CHROME_BROWSER_PRINTING_PRINTER_QUERY_H_