/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface mozIDOMWindowProxy;
interface nsIDocShellTreeOwner;
interface nsPIDOMWindowOuter;

webidl Document;
webidl BrowsingContext;

/**
 * The nsIDocShellTreeItem supplies the methods that are required of any item
 * that wishes to be able to live within the docshell tree either as a middle
 * node or a leaf.
 */

[scriptable, builtinclass, uuid(9b7c586f-9214-480c-a2c4-49b526fff1a6)]
interface nsIDocShellTreeItem : nsISupports
{
  /*
  name of the DocShellTreeItem
  */
  attribute AString name;

  /**
   * Compares the provided name against the item's name and
   * returns the appropriate result.
   *
   * @return <CODE>PR_TRUE</CODE> if names match;
   *         <CODE>PR_FALSE</CODE> otherwise.
   */
  boolean nameEquals(in AString name);

  /*
  Definitions for the item types.
  */
  const long typeChrome=0;            // typeChrome must equal 0
  const long typeContent=1;           // typeContent must equal 1
  const long typeContentWrapper=2;    // typeContentWrapper must equal 2
  const long typeChromeWrapper=3;     // typeChromeWrapper must equal 3

  const long typeAll=0x7FFFFFFF;

  /*
  The type this item is.
  */
  readonly attribute long itemType;
  [noscript,notxpcom,nostdcall] long ItemType();

  /*
  Parent DocShell.

  @deprecated: Use `BrowsingContext::GetParent()` instead.
  (NOTE: `BrowsingContext::GetParent()` will not cross isolation boundaries)
  */
  [binaryname(InProcessParent)]
  readonly attribute nsIDocShellTreeItem parent;

  /*
  This getter returns the same thing parent does however if the parent
  is of a different itemType, or if the parent is an <iframe mozbrowser>.
  It will instead return nullptr.  This call is a convience function for
  Ithose wishing to not cross the boundaries at which item types change.

  @deprecated: Use `BrowsingContext::GetParent()` instead.
  */
  [binaryname(InProcessSameTypeParent)]
  readonly attribute nsIDocShellTreeItem sameTypeParent;

  /*
  Returns the root DocShellTreeItem.  This is a convience equivalent to
  getting the parent and its parent until there isn't a parent.

  @deprecated: Use `BrowsingContext::Top()` instead.
  (NOTE: `BrowsingContext::Top()` will not cross isolation boundaries)
  */
  [binaryname(InProcessRootTreeItem)]
  readonly attribute nsIDocShellTreeItem rootTreeItem;

  /*
  Returns the root DocShellTreeItem of the same type.  This is a convience
  equivalent to getting the parent of the same type and its parent until
  there isn't a parent.

  @deprecated: Use `BrowsingContext::Top()` instead.
  */
  [binaryname(InProcessSameTypeRootTreeItem)]
  readonly attribute nsIDocShellTreeItem sameTypeRootTreeItem;

  /*
  The owner of the DocShell Tree.  This interface will be called upon when
  the docshell has things it needs to tell to the owner of the docshell.
  Note that docShell tree ownership does not cross tree types.  Meaning
  setting ownership on a chrome tree does not set ownership on the content
  sub-trees.  A given tree's boundaries are identified by the type changes.
  Trees of different types may be connected, but should not be traversed
  for things such as ownership.

  Note implementers of this interface should NOT effect the lifetime of the
  parent DocShell by holding this reference as it creates a cycle.  Owners
  when releasing this interface should set the treeOwner to nullptr.
  Implementers of this interface are guaranteed that when treeOwner is
  set that the poitner is valid without having to addref.

  Further note however when others try to get the interface it should be
  addref'd before handing it to them.
  */
  readonly attribute nsIDocShellTreeOwner treeOwner;
  [noscript] void setTreeOwner(in nsIDocShellTreeOwner treeOwner);

  /*
  The current number of DocShells which are immediate children of the
  this object.


  @deprecated: Prefer using `BrowsingContext::Children()`, as this count will
  not include out-of-process iframes.
  */
  [binaryname(InProcessChildCount), infallible]
  readonly attribute long childCount;

  /*
  Add a new child DocShellTreeItem.  Adds to the end of the list.
  Note that this does NOT take a reference to the child.  The child stays
  alive only as long as it's referenced from outside the docshell tree.

  @throws NS_ERROR_ILLEGAL_VALUE if child corresponds to the same
          object as this treenode or an ancestor of this treenode
  @throws NS_ERROR_UNEXPECTED if this node is a leaf in the tree.
  */
  [noscript] void addChild(in nsIDocShellTreeItem child);

  /*
  Removes a child DocShellTreeItem.

  @throws NS_ERROR_UNEXPECTED if this node is a leaf in the tree.
  */
  [noscript] void removeChild(in nsIDocShellTreeItem child);

  /**
   * Return the child at the index requested.  This is 0-based.
   *
   * @deprecated: Prefer using `BrowsingContext::Children()`, as this will not
   * include out-of-process iframes.
   *
   * @throws NS_ERROR_UNEXPECTED if the index is out of range
   */
  [binaryname(GetInProcessChildAt)]
  nsIDocShellTreeItem getChildAt(in long index);

  /**
   * BrowsingContext associated with the DocShell.
   */
  [binaryname(BrowsingContextXPCOM)]
  readonly attribute BrowsingContext browsingContext;

  [noscript,notxpcom,nostdcall] BrowsingContext getBrowsingContext();

  /**
   * Returns the DOM outer window for the content viewer.
   */
  readonly attribute mozIDOMWindowProxy domWindow;

  [noscript,nostdcall,notxpcom] Document getDocument();
  [noscript,nostdcall,notxpcom] nsPIDOMWindowOuter getWindow();
};