gecko-dev/uriloader/base/nsIWebProgressListener.idl

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications, Inc.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Travis Bogard <travis@netscape.com>
 *   Darin Fisher <darin@meer.net>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIWebProgress;
interface nsIRequest;
interface nsIURI;

/**
 * The nsIWebProgressListener interface is implemented by clients wishing to
 * listen in on the progress associated with the loading of documents.
 *
 * @status UNDER_REVIEW
 */
[scriptable, uuid(570F39D1-EFD0-11d3-B093-00A024FFC08C)]
interface nsIWebProgressListener : nsISupports
{
  /**
   * State Transition Flags
   *
   * These flags indicate the various states that documents and requests may
   * transition through as they are being loaded.  These flags are mutually
   * exclusive.
   *
   * STATE_START
   *   This flag indicates the start of a request.
   *
   * STATE_REDIRECTING
   *   This flag indicates that a request is being redirected.  When a redirect
   *   occurs, a new request is generated automatically to process the new
   *   request.  Expect a corresponding STATE_START event for the new request,
   *   and a STATE_STOP for the redirected request.
   *
   * STATE_TRANSFERRING
   *   This flag indicates that data for a request is being transferred to an
   *   end consumer.  This flag indicates that the request has been targeted,
   *   and that the user may start seeing content corresponding to the request.
   *
   * STATE_NEGOTIATING
   *   This flag is not used.
   *
   * STATE_STOP
   *   This flag indicates the completion of a request.
   */
  const unsigned long STATE_START          = 0x00000001;
  const unsigned long STATE_REDIRECTING    = 0x00000002;
  const unsigned long STATE_TRANSFERRING   = 0x00000004;
  const unsigned long STATE_NEGOTIATING    = 0x00000008;
  const unsigned long STATE_STOP           = 0x00000010;


  /**
   * State Type Flags
   *
   * These flags further describe the entity for which the state transition is
   * occuring.  These flags are NOT mutually exclusive (i.e., an onStateChange
   * event may indicate some combination of these flags).
   *
   * STATE_IS_REQUEST
   *   This flag indicates that the state transition is for a non-document
   *   request (e.g., an inline image request).
   *
   * STATE_IS_DOCUMENT
   *   This flag indicates that the state transition is for a document request,
   *   which includes documents in sub-frames.
   *
   * STATE_IS_NETWORK
   *   This flag indicates that the state transition corresponds to a network
   *   level event.  A nsIWebProgressListener attached to a nsIWebProgress will
   *   not see this flag for onStateChange events corresponding to a
   *   subdocument.
   *
   * STATE_IS_WINDOW
   *   This flag indicates that the state transition corresponds to the DOM
   *   window associated with the nsIWebProgress instance.
   */
  const unsigned long STATE_IS_REQUEST     = 0x00010000;
  const unsigned long STATE_IS_DOCUMENT    = 0x00020000;
  const unsigned long STATE_IS_NETWORK     = 0x00040000;
  const unsigned long STATE_IS_WINDOW      = 0x00080000;


  /**
   * State Security Flags
   *
   * A combination of these flags comprises the aState parameter to the
   * onSecurityChange method.  These flags are mutually exclusive.
   *
   * STATE_IS_INSECURE
   *   This flag indicates that the data corresponding to the request
   *   was received over an insecure channel.
   *
   * STATE_IS_BROKEN
   *   This flag indicates an unknown security state.  This may mean that the
   *   request is being loaded as part of a page in which some content was
   *   received over an insecure channel.
   *
   * STATE_IS_SECURE
   *   This flag indicates that the data corresponding to the request was
   *   received over a secure channel.  The degree of security is expressed by
   *   STATE_SECURE_HIGH, STATE_SECURE_MED, or STATE_SECURE_LOW.
   */
  const unsigned long STATE_IS_INSECURE     = 0x00000004;
  const unsigned long STATE_IS_BROKEN       = 0x00000001;
  const unsigned long STATE_IS_SECURE       = 0x00000002;

  const unsigned long STATE_SECURE_HIGH     = 0x00040000;
  const unsigned long STATE_SECURE_MED      = 0x00010000;
  const unsigned long STATE_SECURE_LOW      = 0x00020000;


  /**
   * Notification indicating the state has changed for one of the requests
   * associated with the document being loaded.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification
   * @param aRequest
   *        The nsIRequest that has changed state.
   * @param aStateFlags
   *        Flags indicating the new state.  This value is a combination
   *        of one of the State Transition Flags and one or more of the
   *        State Type Flags defined above.
   * @param aStatus
   *        Error status code associated with the state change.  This parameter
   *        should be ignored unless aStateFlags includes the STATE_STOP bit.
   *        The status code will indicate success / failure of the request
   *        associated with the state change.
   */
  void onStateChange(in nsIWebProgress aWebProgress,
                     in nsIRequest aRequest,
                     in unsigned long aStateFlags,
                     in nsresult aStatus);

  /**
   * Notification that the progress has changed for one of the requests being
   * monitored.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new progress.
   * @param aCurSelfProgress
   *        The current progress for aRequest.
   * @param aMaxSelfProgress
   *        The maximum progress for aRequest.  If this value is not known then
   *        -1 is passed.
   * @param aCurTotalProgress
   *        The current progress for all the requests being monitored.
   * @param aMaxTotalProgress
   *        The total progress for all the requests being monitored.  If this
   *        value is not known then -1 is passed.
   *
   * NOTE: For download sizes that exceed the maximum value representable by
   * type long, -1 will be used.
   */
  void onProgressChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in long aCurSelfProgress,
                        in long aMaxSelfProgress,
                        in long aCurTotalProgress,
                        in long aMaxTotalProgress);

  /**
   * Called when the location of the window being watched changes.  This is not
   * when a load is requested, but rather once it is verified that the load is
   * going to occur in the given window.  For instance, a load that starts in a
   * window might send progress and status messages for the new site, but it
   * will not send the onLocationChange until we are sure that we are loading
   * this new page here.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The associated nsIRequest.  This may be null in some cases.
   * @param aLocation
   *        The URI of the location that is being loaded.
   */
  void onLocationChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in nsIURI aLocation);

  /**
   * Notification that the status of a request has changed.  The status message
   * is intended to be displayed to the user (e.g., in the status bar of the
   * browser).
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new status.
   * @param aStatus
   *        This value is not an error code.  Instead, it is a numeric value
   *        that indicates the current status of the request.  This interface
   *        does not define the set of possible status codes.  NOTE: Some
   *        status values are defined by nsITransport and nsISocketTransport.
   * @param aMessage
   *        Localized text corresponding to aStatus.
   */
  void onStatusChange(in nsIWebProgress aWebProgress,
                      in nsIRequest aRequest,
                      in nsresult aStatus,
                      in wstring aMessage);

  /**
   * Notification called for security progress.  This method will be called on
   * security transitions (eg HTTP -> HTTPS, HTTPS -> HTTP, FOO -> HTTPS) and
   * after document load completion.  It might also be called if an error
   * occurs during network loading.
   *
   * NOTE: These notification will only occur if a security package is
   * installed.
   *
   * @param aWebProgress
   *        The nsIWebProgress instance that fired the notification.
   * @param aRequest
   *        The nsIRequest that has new security state.
   * @param aState
   *        A value composed of the Security State Flags listed above.
   */
  void onSecurityChange(in nsIWebProgress aWebProgress,
                        in nsIRequest aRequest,
                        in unsigned long aState);
};