qt-everywhere-src-5.14.1/qtwebengine/src/core/printing/printing_message_filter_qt.h

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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE.Chromium file.

#ifndef PRINTING_PRINTING_MESSAGE_FILTER_QT_H_
#define PRINTING_PRINTING_MESSAGE_FILTER_QT_H_

#include <string>

#include "base/compiler_specific.h"
#include "components/prefs/pref_member.h"
#include "content/public/browser/browser_message_filter.h"

#if defined(OS_WIN)
#include "base/memory/shared_memory.h"
#endif

struct PrintHostMsg_PreviewIds;
struct PrintHostMsg_ScriptedPrint_Params;

namespace base {
class DictionaryValue;
class FilePath;
}

namespace content {
class WebContents;
}

namespace printing {
class PrintJobManager;
class PrintQueriesQueue;
class PrinterQuery;
}

namespace QtWebEngineCore {
// This class filters out incoming printing related IPC messages for the
// renderer process on the IPC thread.
class PrintingMessageFilterQt : public content::BrowserMessageFilter {
 public:
  PrintingMessageFilterQt(int render_process_id);

  // content::BrowserMessageFilter methods.
  void OverrideThreadForMessage(const IPC::Message& message,
                                content::BrowserThread::ID* thread) override;
  bool OnMessageReceived(const IPC::Message& message) override;

 private:
  ~PrintingMessageFilterQt() override;

  // GetPrintSettingsForRenderView must be called via PostTask and
  // base::Bind.  Collapse the settings-specific params into a
  // struct to avoid running into issues with too many params
  // to base::Bind.
  struct GetPrintSettingsForRenderViewParams;

  // Get the default print setting.
  void OnGetDefaultPrintSettings(IPC::Message* reply_msg);
  void OnGetDefaultPrintSettingsReply(std::unique_ptr<printing::PrinterQuery> printer_query,
                                      IPC::Message* reply_msg);

  // The renderer host have to show to the user the print dialog and returns
  // the selected print settings. The task is handled by the print worker
  // thread and the UI thread. The reply occurs on the IO thread.
  void OnScriptedPrint(const PrintHostMsg_ScriptedPrint_Params& params,
                       IPC::Message* reply_msg);
  void OnScriptedPrintReply(std::unique_ptr<printing::PrinterQuery> printer_query,
                            IPC::Message* reply_msg);

  // Modify the current print settings based on |job_settings|. The task is
  // handled by the print worker thread and the UI thread. The reply occurs on
  // the IO thread.
  void OnUpdatePrintSettings(int document_cookie,
                             base::Value job_settings,
                             IPC::Message* reply_msg);
  void OnUpdatePrintSettingsReply(std::unique_ptr<printing::PrinterQuery> printer_query,
                                  IPC::Message* reply_msg);

  // Check to see if print preview has been cancelled.
  void OnCheckForCancel(const PrintHostMsg_PreviewIds& ids, bool* cancel);

  const int render_process_id_;

  scoped_refptr<printing::PrintQueriesQueue> queue_;

  DISALLOW_COPY_AND_ASSIGN(PrintingMessageFilterQt);
};

}  // namespace printing

#endif  // PRINTING_PRINTING_MESSAGE_FILTER_QT_H_