зеркало из https://github.com/mozilla/pjs.git
168 строки
5.7 KiB
C++
168 строки
5.7 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 "nscore.h"
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#include "nsCoord.h"
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class nsIFrame;
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struct nsRect;
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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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/**
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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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* Obtain this interface from frames via nsIFrame::GetLineIterator.
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* When you are finished using the iterator, call DisposeLineIterator()
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* to destroy the iterator if appropriate.
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*/
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class nsILineIterator
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{
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protected:
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~nsILineIterator() { }
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public:
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virtual void DisposeLineIterator() = 0;
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/**
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* The number of lines in the block
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*/
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virtual PRInt32 GetNumLines() = 0;
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/**
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* The prevailing direction of lines.
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*
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* @return true if the CSS direction property for the block is
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* "rtl", otherwise false
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*/
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virtual bool GetDirection() = 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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/**
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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, as long as it's at least as big as
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* aStartLine. Returns -1 if the frame cannot be found on lines
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* starting with aStartLine.
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*/
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virtual PRInt32 FindLineContaining(nsIFrame* aFrame,
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PRInt32 aStartLine = 0) = 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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bool* aXIsBeforeFirstFrame,
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bool* 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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bool *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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class nsAutoLineIterator
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{
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public:
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nsAutoLineIterator() : mRawPtr(nsnull) { }
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nsAutoLineIterator(nsILineIterator *i) : mRawPtr(i) { }
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~nsAutoLineIterator() {
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if (mRawPtr)
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mRawPtr->DisposeLineIterator();
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}
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operator nsILineIterator*() { return mRawPtr; }
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nsILineIterator* operator->() { return mRawPtr; }
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nsILineIterator* operator=(nsILineIterator* i) {
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if (i == mRawPtr)
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return i;
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if (mRawPtr)
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mRawPtr->DisposeLineIterator();
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mRawPtr = i;
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return i;
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}
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private:
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nsILineIterator* mRawPtr;
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};
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#endif /* nsILineIterator_h___ */
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