gecko-dev/layout/generic/nsILineIterator.h

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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
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*
* 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/
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*
* 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.
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*
* 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 ***** */
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#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}}
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// 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: it's not reflexive (you can't query back to the block
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// frame) and unlike other frames, it *IS* reference counted so don't
// forget to NS_RELEASE it when you are done with it!
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// 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
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class nsILineIterator : public nsISupports {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_IID)
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// 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
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// 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.
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NS_IMETHOD GetLine(PRInt32 aLineNumber,
nsIFrame** aFirstFrameOnLine,
PRInt32* aNumFramesOnLine,
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nsRect& aLineBounds,
PRUint32* aLineFlags) = 0;
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// Given a frame that's a child of the block, find which line its on
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// 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
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};
NS_DEFINE_STATIC_IID_ACCESSOR(nsILineIterator, NS_ILINE_ITERATOR_IID)
//special line iterator for keyboard navigation
class nsILineIteratorNavigator : public nsILineIterator {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_NAV_IID)
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsILineIteratorNavigator,
NS_ILINE_ITERATOR_NAV_IID)
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#endif /* nsILineIterator_h___ */