cef/include/cef_download_handler.h

// Copyright (c) 2012 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
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// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//

#ifndef CEF_INCLUDE_CEF_DOWNLOAD_HANDLER_H_
#define CEF_INCLUDE_CEF_DOWNLOAD_HANDLER_H_
#pragma once

#include "include/cef_base.h"
#include "include/cef_browser.h"
#include "include/cef_download_item.h"

///
/// Callback interface used to asynchronously continue a download.
///
/*--cef(source=library)--*/
class CefBeforeDownloadCallback : public virtual CefBaseRefCounted {
 public:
  ///
  /// Call to continue the download. Set |download_path| to the full file path
  /// for the download including the file name or leave blank to use the
  /// suggested name and the default temp directory. Set |show_dialog| to true
  /// if you do wish to show the default "Save As" dialog.
  ///
  /*--cef(capi_name=cont,optional_param=download_path)--*/
  virtual void Continue(const CefString& download_path, bool show_dialog) = 0;
};

///
/// Callback interface used to asynchronously cancel a download.
///
/*--cef(source=library)--*/
class CefDownloadItemCallback : public virtual CefBaseRefCounted {
 public:
  ///
  /// Call to cancel the download.
  ///
  /*--cef()--*/
  virtual void Cancel() = 0;

  ///
  /// Call to pause the download.
  ///
  /*--cef()--*/
  virtual void Pause() = 0;

  ///
  /// Call to resume the download.
  ///
  /*--cef()--*/
  virtual void Resume() = 0;
};

///
/// Class used to handle file downloads. The methods of this class will called
/// on the browser process UI thread.
///
/*--cef(source=client)--*/
class CefDownloadHandler : public virtual CefBaseRefCounted {
 public:
  ///
  /// Called before a download begins in response to a user-initiated action
  /// (e.g. alt + link click or link click that returns a `Content-Disposition:
  /// attachment` response from the server). |url| is the target download URL
  /// and |request_method| is the target method (GET, POST, etc). Return true to
  /// proceed with the download or false to cancel the download.
  ///
  /*--cef()--*/
  virtual bool CanDownload(CefRefPtr<CefBrowser> browser,
                           const CefString& url,
                           const CefString& request_method) {
    return true;
  }

  ///
  /// Called before a download begins. |suggested_name| is the suggested name
  /// for the download file. By default the download will be canceled. Execute
  /// |callback| either asynchronously or in this method to continue the
  /// download if desired. Do not keep a reference to |download_item| outside of
  /// this method.
  ///
  /*--cef()--*/
  virtual void OnBeforeDownload(
      CefRefPtr<CefBrowser> browser,
      CefRefPtr<CefDownloadItem> download_item,
      const CefString& suggested_name,
      CefRefPtr<CefBeforeDownloadCallback> callback) = 0;

  ///
  /// Called when a download's status or progress information has been updated.
  /// This may be called multiple times before and after OnBeforeDownload().
  /// Execute |callback| either asynchronously or in this method to cancel the
  /// download if desired. Do not keep a reference to |download_item| outside of
  /// this method.
  ///
  /*--cef()--*/
  virtual void OnDownloadUpdated(CefRefPtr<CefBrowser> browser,
                                 CefRefPtr<CefDownloadItem> download_item,
                                 CefRefPtr<CefDownloadItemCallback> callback) {}
};

#endif  // CEF_INCLUDE_CEF_DOWNLOAD_HANDLER_H_