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151 lines
6.3 KiB
C++
151 lines
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsILineIterator_h___
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#define nsILineIterator_h___
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#include "nsISupports.h"
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/* a6cf90ff-15b3-11d2-932e-00805f8add32 */
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#define NS_ILINE_ITERATOR_IID \
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{ 0xa6cf90ff, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
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/* {80AA3D7A-E0BF-4e18-8A82-2110397D7BC4}*/
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#define NS_ILINE_ITERATOR_NAV_IID \
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{ 0x80aa3d7a, 0xe0bf, 0x4e18,{0x8a, 0x82, 0x21, 0x10, 0x39, 0x7d, 0x7b, 0xc4}}
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// Line iterator API.
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//
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// Lines are numbered from 0 to N, where 0 is the top line and N is
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// the bottom line.
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//
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// NOTE: while you can get this interface by doing a slezy hacky
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// QueryInterface on block frames, it isn't like a normal com
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// 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
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// forget to NS_RELEASE it when you are done with it!
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// Line Flags (see GetLine below)
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// This bit is set when the line is wrapping up a block frame. When
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// clear, it means that the line contains inline elements.
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#define NS_LINE_FLAG_IS_BLOCK 0x1
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// This bit is set when the line ends in some sort of break.
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#define NS_LINE_FLAG_ENDS_IN_BREAK 0x4
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class nsILineIterator : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_IID)
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// Return the number of lines in the block.
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NS_IMETHOD GetNumLines(PRInt32* aResult) = 0;
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// Return the prevailing direction for the line. aIsRightToLeft will
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// be set to PR_TRUE if the CSS direction property for the block is
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// "rtl", otherwise aIsRightToLeft will be set to PR_FALSE.
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NS_IMETHOD GetDirection(PRBool* aIsRightToLeft) = 0;
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// Return structural information about a line. aFirstFrameOnLine is
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// the first frame on the line and aNumFramesOnLine is the number of
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// frames that are on the line. If the line-number is invalid then
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// aFirstFrameOnLine will be nsnull and aNumFramesOnLine will be
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// zero.
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//
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// For valid line numbers, aLineBounds is set to the bounding box of
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// the line (which is based on the in-flow position of the frames on
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// the line; if a frame was moved because of relative positioning
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// then its coordinates may be outside the line bounds).
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//
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// In addition, aLineFlags will contain flag information about the
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// line.
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NS_IMETHOD GetLine(PRInt32 aLineNumber,
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nsIFrame** aFirstFrameOnLine,
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PRInt32* aNumFramesOnLine,
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nsRect& aLineBounds,
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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
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// be set to -1 if the frame cannot be found.
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NS_IMETHOD FindLineContaining(nsIFrame* aFrame,
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PRInt32* aLineNumberResult) = 0;
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// Given a Y coordinate relative to the block that provided this
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// line iterator, find the line that contains the Y
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// coordinate. Returns -1 in aLineNumberResult if the Y coordinate
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// is above the first line. Returns N (where N is the number of
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// lines) if the Y coordinate is below the last line.
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NS_IMETHOD FindLineAt(nscoord aY,
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PRInt32* aLineNumberResult) = 0;
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// Given a line number and an X coordinate, find the frame on the
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// line that is nearest to the X coordinate. The
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// aXIsBeforeFirstFrame and aXIsAfterLastFrame flags are updated
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// appropriately.
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NS_IMETHOD FindFrameAt(PRInt32 aLineNumber,
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nscoord aX,
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nsIFrame** aFrameFound,
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PRBool* aXIsBeforeFirstFrame,
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PRBool* aXIsAfterLastFrame) = 0;
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// Give the line iterator implementor a chance todo something more complicated than
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// nsIFrame::GetNextSibling()
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NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, PRInt32 aLineNumber) = 0;
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#ifdef IBMBIDI
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// Check whether visual and logical order of frames within a line are identical.
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// If not, return the first and last visual frames
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NS_IMETHOD CheckLineOrder(PRInt32 aLine,
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PRBool *aIsReordered,
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nsIFrame **aFirstVisual,
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nsIFrame **aLastVisual) = 0;
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#endif
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsILineIterator, NS_ILINE_ITERATOR_IID)
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//special line iterator for keyboard navigation
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class nsILineIteratorNavigator : public nsILineIterator {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ILINE_ITERATOR_NAV_IID)
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsILineIteratorNavigator,
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NS_ILINE_ITERATOR_NAV_IID)
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#endif /* nsILineIterator_h___ */
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