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- /* -*- 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
- * 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 Mozilla Communicator client code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * 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
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * 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 nsILineIterator_h___
- #define nsILineIterator_h___
-
- #include "nsISupports.h"
-
- /* a6cf90ff-15b3-11d2-932e-00805f8add32 */
- #define NS_ILINE_ITERATOR_IID \
- { 0xa6cf90ff, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
-
- /* {80AA3D7A-E0BF-4e18-8A82-2110397D7BC4}*/
- #define NS_ILINE_ITERATOR_NAV_IID \
- { 0x80aa3d7a, 0xe0bf, 0x4e18,{0x8a, 0x82, 0x21, 0x10, 0x39, 0x7d, 0x7b, 0xc4}}
-
- // Line iterator API.
- //
- // Lines are numbered from 0 to N, where 0 is the top line and N is
- // the bottom line.
- //
- // NOTE: while you can get this interface by doing a slezy hacky
- // QueryInterface on block frames, it isn't like a normal com
- // interface: its not reflexive (you can't query back to the block
- // frame) and unlike other frames, it *IS* reference counted so don't
- // forget to NS_RELEASE it when you are done with it!
-
- // Line Flags (see GetLine below)
-
- // This bit is set when the line is wrapping up a block frame. When
- // clear, it means that the line contains inline elements.
- #define NS_LINE_FLAG_IS_BLOCK 0x1
-
- // This bit is set when the line ends in some sort of break.
- #define NS_LINE_FLAG_ENDS_IN_BREAK 0x4
-
- class nsILineIterator : public nsISupports {
- public:
- NS_DEFINE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_IID)
-
- // Return the number of lines in the block.
- NS_IMETHOD GetNumLines(PRInt32* aResult) = 0;
-
- // Return the prevailing direction for the line. aIsRightToLeft will
- // be set to PR_TRUE if the CSS direction property for the block is
- // "rtl", otherwise aIsRightToLeft will be set to PR_FALSE.
- NS_IMETHOD GetDirection(PRBool* aIsRightToLeft) = 0;
-
- // Return structural information about a line. aFirstFrameOnLine is
- // the first frame on the line and aNumFramesOnLine is the number of
- // frames that are on the line. If the line-number is invalid then
- // aFirstFrameOnLine will be nsnull and aNumFramesOnLine will be
- // zero.
- //
- // For valid line numbers, aLineBounds is set to the bounding box of
- // the line (which is based on the in-flow position of the frames on
- // the line; if a frame was moved because of relative positioning
- // then its coordinates may be outside the line bounds).
- //
- // In addition, aLineFlags will contain flag information about the
- // line.
- NS_IMETHOD GetLine(PRInt32 aLineNumber,
- nsIFrame** aFirstFrameOnLine,
- PRInt32* aNumFramesOnLine,
- nsRect& aLineBounds,
- PRUint32* aLineFlags) = 0;
-
- // Given a frame thats a child of the block, find which line its on
- // and return that line index into aIndexResult. aIndexResult will
- // be set to -1 if the frame cannot be found.
- NS_IMETHOD FindLineContaining(nsIFrame* aFrame,
- PRInt32* aLineNumberResult) = 0;
-
- // Given a Y coordinate relative to the block that provided this
- // line iterator, find the line that contains the Y
- // coordinate. Returns -1 in aLineNumberResult if the Y coordinate
- // is above the first line. Returns N (where N is the number of
- // lines) if the Y coordinate is below the last line.
- NS_IMETHOD FindLineAt(nscoord aY,
- PRInt32* aLineNumberResult) = 0;
-
- // Given a line number and an X coordinate, find the frame on the
- // line that is nearest to the X coordinate. The
- // aXIsBeforeFirstFrame and aXIsAfterLastFrame flags are updated
- // appropriately.
- NS_IMETHOD FindFrameAt(PRInt32 aLineNumber,
- nscoord aX,
- nsIFrame** aFrameFound,
- PRBool* aXIsBeforeFirstFrame,
- PRBool* aXIsAfterLastFrame) = 0;
-
- // Give the line iterator implementor a chance todo something more complicated than
- // nsIFrame::GetNextSibling()
- NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, PRInt32 aLineNumber) = 0;
-
- #ifdef IBMBIDI
- // Check whether visual and logical order of frames within a line are identical.
- // If not, return the first and last visual frames
- NS_IMETHOD CheckLineOrder(PRInt32 aLine,
- PRBool *aIsReordered,
- nsIFrame **aFirstVisual,
- nsIFrame **aLastVisual) = 0;
- #endif
- };
-
- //special line iterator for keyboard navigation
- class nsILineIteratorNavigator : public nsILineIterator {
- public:
- NS_DEFINE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_NAV_IID)
-
- };
- #endif /* nsILineIterator_h___ */
-