Thu, 17 May 2007 20:49:14 -0700
changeset 1585 633138510b5ae5e25a3bfe66d2db572dc361d448
parent 582 54f283fe7b8a87bccde276b2772618a29c9a4a0a
child 3950 e112a9199ae664aaa40cd0078df8e1e0d5da0f69
permissions -rw-r--r--
Move nsIDocShellTreeItem::childOffset to nsDocShell and remove all uses except internally by nsDocShell (it should be removed eventually). b=376562 r=Olli.Pettay sr=bzbarsky

/* -*- Mode: C++; tab-width: 2; 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
 * 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 code.
 * The Initial Developers of the Original Code are
 * Sun Microsystems and IBM Corporation
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 *   Ginn Chen (
 *   Aaron Leventhal (
 * 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
 * of those above. If you wish to allow use of your version of this file only
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * ***** END LICENSE BLOCK ***** */

#ifndef _nsHyperTextAccessible_H_
#define _nsHyperTextAccessible_H_

#include "nsAccessibleWrap.h"
#include "nsIAccessibleText.h"
#include "nsIAccessibleHyperText.h"
#include "nsIAccessibleEditableText.h"
#include "nsAccessibleEventData.h"
#include "nsIEditActionListener.h"
#include "nsIEditor.h"
#include "nsFrameSelection.h"
#include "nsISelectionController.h"

enum EGetTextType { eGetBefore=-1, eGetAt=0, eGetAfter=1 };

// This character marks where in the text returned via nsIAccessibleText(),
// that embedded object characters exist
const PRUnichar kEmbeddedObjectChar = 0xfffc;
const PRUnichar kForcedNewLineChar = '\n';

  * Special Accessible that knows how contain both text and embedded objects
class nsHyperTextAccessible : public nsAccessibleWrap,
                              public nsIAccessibleText,
                              public nsIAccessibleHyperText,
                              public nsIAccessibleEditableText,
                              public nsIEditActionListener
  nsHyperTextAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell);

  NS_IMETHOD GetRole(PRUint32 *aRole);
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);
  void CacheChildren();

  PRBool IsHyperText();

   * This does the work for nsIAccessibleText::GetText[At|Before|After]Offset
   * @param aType, eGetBefore, eGetAt, eGetAfter
   * @param aBoundaryType, char/word-start/word-end/line-start/line-end/paragraph/attribute
   * @param aOffset, offset into the hypertext to start from
   * @param *aStartOffset, the resulting start offset for the returned substring
   * @param *aEndOffset, the resulting end offset for the returned substring
   * @param aText, the resulting substring
   * @return success/failure code
  nsresult GetTextHelper(EGetTextType aType, nsAccessibleTextBoundary aBoundaryType,
                         PRInt32 aOffset, PRInt32 *aStartOffset, PRInt32 *aEndOffset,
                         nsAString & aText);

    * Used by GetPosAndText to move backward/forward from a given point by word/line/etc.
    * @param aPresShell, the current presshell we're moving in
    * @param aFromFrame, the starting frame we're moving from
    * @param aFromOffset, the starting offset we're moving from
    * @param aAmount, how much are we moving (word/line/etc.) ?
    * @param aDirection, forward or backward?
    * @param aNeedsStart, for word and line cases, are we basing this on the start or end?
    * @return, the resulting offset into this hypertext
  PRInt32 GetRelativeOffset(nsIPresShell *aPresShell, nsIFrame *aFromFrame, PRInt32 aFromOffset,
                            nsSelectionAmount aAmount, nsDirection aDirection, PRBool aNeedsStart);
    * Given a start offset and end offset, get substring information. Different info is returned depending
    * on what optional paramters are provided.
    * @param aStartOffset, the start offset into the hyper text. This is also an out parameter used to return
    *                      the offset into the start frame's text content (start frame is the @return)
    * @param aEndOffset, the endoffset into the hyper text. This is also an out parameter used to return
    *                    the offset into the end frame's text content
    * @param aText (optional), return the substring's text
    * @param aEndFrame (optional), return the end frame for this substring
    * @param aBoundsRect (optional), return the bounds rectangle for this substring
    * @return the start frame for this substring
  nsIFrame* GetPosAndText(PRInt32& aStartOffset, PRInt32& aEndOffset, nsAString *aText = nsnull,
                          nsIFrame **aEndFrame = nsnull, nsIntRect *aBoundsRect = nsnull);
    * Turn a DOM Node and offset into a character offset into this hypertext. Will look for closest match
    * when the DOM node does not have an accessible object associated with it.
    * Will return an offset for the end of the string if the node is not found.
    * @param aNode, the node to look for
    * @param aNodeOffset, the offset to look for
    * @param aResult, the character offset into the current nsHyperTextAccessible
    * @param aFinalAccessible (optional), returns the accessible child which contained the offset,
    *                                     if it is within the current nsHyperTextAccessible, otherwise
    *                                     it is set to nsnull.
    * @return failure/success code
  nsresult DOMPointToOffset(nsIDOMNode* aNode, PRInt32 aNodeOffset, PRInt32 *aResultOffset,
                            nsIAccessible **aFinalAccessible = nsnull);
  nsIntRect GetBoundsForString(nsIFrame *aFrame, PRInt32 aStartOffset, PRInt32 aLength);

  // Editor helpers, subclasses of nsHyperTextAccessible may have editor
  virtual void SetEditor(nsIEditor *aEditor) { return; }
  virtual already_AddRefed<nsIEditor> GetEditor() { return nsnull; }

  // Selection helpers
  nsresult GetSelections(nsISelectionController **aSelCon, nsISelection **aDomSel);
  nsresult SetSelectionRange(PRInt32 aStartPos, PRInt32 aEndPos);

#endif  // _nsHyperTextAccessible_H_