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114 lines
4.5 KiB
C++
114 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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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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// 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: its 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, when set, indicates that the line has had a trailing
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// white-space compressed. The bit is only set on lines that contain
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// inline elements, and is only set when actual white-space is
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// compressed.
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#define NS_LINE_FLAG_IS_TRIMMED 0x2
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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_DEFINE_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 thats 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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};
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#endif /* nsILineIterator_h___ */
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