/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 Netscape are
 * Copyright (C) 1999, Mozilla.  All Rights Reserved.
 * 
 * Contributor(s):
 *   Travis Bogard <travis@netscape.com>
 *   Steve Clark <buster@netscape.com>
 */

#include "nsISupports.idl"

%{ C++
class nsIPresContext;
class nsIPresShell;
%}

/**
 * The nsIDocShell interface.
 */

[ptr] native nsIPresContext(nsIPresContext);
[ptr] native nsIPresShell(nsIPresShell);

interface nsIURI;
interface nsIContentViewer;
interface nsIURIContentListener;
interface nsIChromeEventHandler;
interface nsIDocShellLoadInfo;
interface nsIDocumentCharsetInfo;
interface nsIWebNavigation;
interface nsISimpleEnumerator;
interface nsIInputStream;
interface nsIRequest;
interface nsISHEntry;
interface nsILayoutHistoryState;

[scriptable, uuid(69E5DE00-7B8B-11d3-AF61-00A024FFC08C)]
interface nsIDocShell : nsISupports
{
  /**
   * Loads a given URI.  This will give priority to loading the requested URI
   * in the object implementing	this interface.  If it can't be loaded here
   * however, the URL dispatcher will go through its normal process of content
   * loading.
   *
   * @param uri        - The URI to load.
   * @param loadInfo   - This is the extended load info for this load.  This
   *                     most often will be null, but if you need to do 
   *                     additional setup for this load you can get a loadInfo
   *                     object by calling createLoadInfo.  Once you have this
   *                     object you can set the needed properties on it and
   *                     then pass it to loadURI.
   * @param aLoadFlags - Flags to modify load behaviour. Flags are defined
   *                     in nsIWebNavigation.
   */
  [noscript]void loadURI(in nsIURI uri,
                         in nsIDocShellLoadInfo loadInfo,
                         in unsigned long aLoadFlags,
                         in boolean firstParty);

  /**
   * Loads a given stream. This will give priority to loading the requested
   * stream in the object implementing this interface. If it can't be loaded
   * here however, the URL dispatched will go through its normal process of
   * content loading.
   *
   * @param aStream         - The input stream that provides access to the data
   *                          to be loaded.  This must be a blocking, threadsafe
   *                          stream implementation.
   * @param aURI            - The URI representing the stream, or null.
   * @param aContentType    - The type (MIME) of data being loaded (empty if unknown).
   * @param aContentCharset - The charset of the data being loaded (empty if unknown).
   * @param aLoadInfo       - This is the extended load info for this load.  This
   *                          most often will be null, but if you need to do 
   *                          additional setup for this load you can get a
   *                          loadInfo object by calling createLoadInfo.  Once
   *                          you have this object you can set the needed 
   *                          properties on it and then pass it to loadStream.
   */
  [noscript]void loadStream(in nsIInputStream aStream,
                            in nsIURI aURI,
                            in ACString aContentType,
                            in ACString aContentCharset,
                            in nsIDocShellLoadInfo aLoadInfo);

  const long INTERNAL_LOAD_FLAGS_NONE               = 0x0;
  const long INTERNAL_LOAD_FLAGS_INHERIT_OWNER      = 0x1;
  const long INTERNAL_LOAD_FLAGS_DONT_SEND_REFERRER = 0x2;

  /**
   * Loads the given URI.  This method is identical to loadURI(...) except
   * that its parameter list is broken out instead of being packaged inside
   * of an nsIDocShellLoadInfo object...
   *
   * @param aURI            - The URI to load.
   * @param aReferrer       - Referring URI
   * @param aOwner          - Owner (security principal) 
   * @param aInheritOwner   - Flag indicating whether the owner of the current
   *                          document should be inherited if aOwner is null.
   * @param aStopActiveDoc  - Flag indicating whether loading the current
   *                          document should be stopped.
   * @param aWindowTarget   - Window target for the load.
   * @param aTypeHint       - A hint as to the content-type of the resulting
   *                          data.  May be null or empty if no hint.
   * @param aPostDataStream - Post data stream (if POSTing)
   * @param aHeadersStream  - Stream containing "extra" request headers...
   * @param aLoadFlags      - Flags to modify load behaviour. Flags are defined
   *                          in nsIWebNavigation.
   * @param aSHEntry        - Active Session History entry (if loading from SH)
   */
  [noscript]void internalLoad(in nsIURI aURI,
                              in nsIURI aReferrer,
                              in nsISupports aOwner,
                              in PRUint32 aFlags,
                              in wstring aWindowTarget,
                              in string aTypeHint,
                              in nsIInputStream aPostDataStream,
                              in nsIInputStream aHeadersStream,
                              in unsigned long aLoadFlags,
                              in nsISHEntry aSHEntry,
                              in boolean firstParty,
                              out nsIDocShell aDocShell,
                              out nsIRequest aRequest);

  /**
   * Creates a DocShellLoadInfo object that you can manipulate and then pass
   * to loadURI.
   */
  void createLoadInfo(out nsIDocShellLoadInfo loadInfo);

  /**
   * Reset state to a new content model within the current document and the document
   * viewer.  Called by the document before initiating an out of band document.write().
   */
  void prepareForNewContentModel();

  /**
   * For editors and suchlike who wish to change the URI associated with the
   * document. Note if you want to get the current URI, use the read-only
   * property on nsIWebNavigation.
   */ 
  void setCurrentURI(in nsIURI aURI);

  /**
   * Notify the associated content viewer and all child docshells that they are
   * about to be unloaded.
   */
  [noscript] void fireUnloadNotification();

  /**
   * Presentation context for the currently loaded document.  This may be null.
   */
  [noscript] readonly attribute nsIPresContext presContext;

  /**
   * Presentation shell for the currently loaded document.  This may be null.
   */
  [noscript] readonly attribute nsIPresShell presShell;

  /**
   * Presentation shell for the oldest document, if this docshell is
   * currently transitioning between documents.
   */
  [noscript] readonly attribute nsIPresShell eldestPresShell;

  /**
   * Content Viewer that is currently loaded for this DocShell.  This may
   * change as the underlying content changes.
   */
  readonly attribute nsIContentViewer contentViewer;

  /**
   * This attribute allows chrome to tie in to handle DOM events that may
   * be of interest to chrome.
   */
  attribute nsIChromeEventHandler chromeEventHandler;

  /**
   * URI content listener parent.  This is not refcounted and is assumed to be
   * nulled out by the parent when the parent is going away.
   */
  attribute nsIURIContentListener parentURIContentListener;

  /**
   * The document charset info.  This is used by a load to determine priorities
   * for charset detection etc.
   */
  attribute nsIDocumentCharsetInfo documentCharsetInfo;

  /**
   * Whether to allow plugin execution
   */
  attribute boolean allowPlugins;

  /**
   * Whether to allow Javascript execution
   */
  attribute boolean allowJavascript;

  /**
   * Attribute stating if refresh based redirects can be allowed
   */
  attribute  boolean allowMetaRedirects;

  /**
   * Attribute stating if it should allow subframes (framesets/iframes) or not
   */
  attribute boolean allowSubframes;

  /**
   * Attribute stating whether or not images should be loaded.
   */
  attribute boolean allowImages;

  /**
   * Get an enumerator over this docShell and its children.
   *
   * @param aItemType  - Only include docShells of this type, or if typeAll,
   *                     include all child shells.
   *                     Uses types from nsIDocShellTreeItem.
   * @param aDirection - Whether to enumerate forwards or backwards.
   */

  const long ENUMERATE_FORWARDS  = 0;
  const long ENUMERATE_BACKWARDS = 1;

  nsISimpleEnumerator getDocShellEnumerator(in long aItemType,
                                            in long aDirection);

  /**
   * The type of application that created this window
   */
  const unsigned long APP_TYPE_UNKNOWN  = 0;
  const unsigned long APP_TYPE_MAIL     = 1;
  const unsigned long APP_TYPE_EDITOR   = 2;

  attribute unsigned long appType;

  /**
   * certain dochshells (like the message pane)
   * should not throw up auth dialogs
   * because it can act as a password trojan
   */
  attribute boolean allowAuth;

  /**
   * Set/Get the document scale factor.  When setting this attribute, a
   * NS_ERROR_NOT_IMPLEMENTED error may be returned by implementations
   * not supporting zoom.  Implementations not supporting zoom should return
   * 1.0 all the time for the Get operation.  1.0 by the way is the default
   * of zoom.  This means 100% of normal scaling or in other words normal size
   * no zoom. 
   */
  attribute float zoom;

  /*
   * XXX Comment here!
   */
  attribute long marginWidth;

  /*
   * XXX Comment here!
   */
  attribute long marginHeight;

  /*
   * Tells the DocShell that it now has focus or has lost focus
   */
  attribute boolean hasFocus;

  /*
   * Tells the docshell whether the canvas should have focus
   */
  attribute boolean canvasHasFocus;

  /*
   * Tells the docshell to offer focus to its tree owner.
   * This is currently only necessary for embedding chrome.
   */
  void tabToTreeOwner(in boolean forward,
                      out boolean tookFocus);

  /**
   * Current busy state for DocShell
   */
  const unsigned long BUSY_FLAGS_NONE             = 0;
  const unsigned long BUSY_FLAGS_BUSY             = 1;
  const unsigned long BUSY_FLAGS_BEFORE_PAGE_LOAD = 2;
  const unsigned long BUSY_FLAGS_PAGE_LOADING     = 4;

  /**
   * Load commands for the document 
   */
  const unsigned long LOAD_CMD_NORMAL  = 0x1; // Normal load
  const unsigned long LOAD_CMD_RELOAD  = 0x2; // Reload
  const unsigned long LOAD_CMD_HISTORY = 0x4; // Load from history

  readonly attribute unsigned long busyFlags;

  /* 
   * attribute to access the loadtype  for the document
   */
  attribute unsigned long  loadType;

  /*
   * returns true if the docshell is being destroyed, false otherwise
   */
  boolean isBeingDestroyed();

  /*
   * Returns true if the docshell is currently executing the onLoad Handler
   */
  readonly attribute boolean isExecutingOnLoadHandler;

  attribute nsILayoutHistoryState layoutHistoryState;

  readonly attribute boolean shouldSaveLayoutState;
};