text: // 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.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  // ---------------------------------------------------------------------------
  //
  // 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_LOAD_HANDLER_H_
  #define CEF_INCLUDE_CEF_LOAD_HANDLER_H_
  #pragma once
  
  #include "include/cef_base.h"
  #include "include/cef_browser.h"
  #include "include/cef_frame.h"
  
  ///
  // Implement this interface to handle events related to browser load status. The
  // methods of this class will be called on the browser process UI thread or
  // render process main thread (TID_RENDERER).
  ///
  /*--cef(source=client)--*/
  class CefLoadHandler : public virtual CefBaseRefCounted {
   public:
    typedef cef_errorcode_t ErrorCode;
    typedef cef_transition_type_t TransitionType;
  
    ///
    // Called when the loading state has changed. This callback will be executed
    // twice -- once when loading is initiated either programmatically or by user
    // action, and once when loading is terminated due to completion, cancellation
    // of failure. It will be called before any calls to OnLoadStart and after all
    // calls to OnLoadError and/or OnLoadEnd.
    ///
    /*--cef()--*/
    virtual void OnLoadingStateChange(CefRefPtr<CefBrowser> browser,
                                      bool isLoading,
                                      bool canGoBack,
                                      bool canGoForward) {}
  
    ///
    // Called after a navigation has been committed and before the browser begins
    // loading contents in the frame. The |frame| value will never be empty --
    // call the IsMain() method to check if this frame is the main frame.
    // |transition_type| provides information about the source of the navigation
    // and an accurate value is only available in the browser process. Multiple
    // frames may be loading at the same time. Sub-frames may start or continue
    // loading after the main frame load has ended. This method will not be called
    // for same page navigations (fragments, history state, etc.) or for
    // navigations that fail or are canceled before commit. For notification of
    // overall browser load status use OnLoadingStateChange instead.
    ///
    /*--cef()--*/
    virtual void OnLoadStart(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             TransitionType transition_type) {}
  
    ///
    // Called when the browser is done loading a frame. The |frame| value will
    // never be empty -- call the IsMain() method to check if this frame is the
    // main frame. Multiple frames may be loading at the same time. Sub-frames may
    // start or continue loading after the main frame load has ended. This method
    // will not be called for same page navigations (fragments, history state,
    // etc.) or for navigations that fail or are canceled before commit. For
    // notification of overall browser load status use OnLoadingStateChange
    // instead.
    ///
    /*--cef()--*/
    virtual void OnLoadEnd(CefRefPtr<CefBrowser> browser,
                           CefRefPtr<CefFrame> frame,
                           int httpStatusCode) {}
  
    ///
    // Called when a navigation fails or is canceled. This method may be called
    // by itself if before commit or in combination with OnLoadStart/OnLoadEnd if
    // after commit. |errorCode| is the error code number, |errorText| is the
    // error text and |failedUrl| is the URL that failed to load.
    // See net\base\net_error_list.h for complete descriptions of the error codes.
    ///
    /*--cef(optional_param=errorText)--*/
    virtual void OnLoadError(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             ErrorCode errorCode,
                             const CefString& errorText,
                             const CefString& failedUrl) {}
  };
  
  #endif  // CEF_INCLUDE_CEF_LOAD_HANDLER_H_
  