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127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:ts=8:et:sw=4:
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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 nsIntervalSet.
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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 the Initial Developer are Copyright
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* (C) 2001 the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org> (original author)
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 nsIntervalSet_h___
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#define nsIntervalSet_h___
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#include "prtypes.h"
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#include "nsCoord.h"
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#include "nsDebug.h"
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typedef void *
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(* PR_CALLBACK IntervalSetAlloc)(size_t aBytes, void *aClosure);
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typedef void
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(* PR_CALLBACK IntervalSetFree) (size_t aBytes, void *aPtr, void *aClosure);
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/*
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* A list-based class (hopefully tree-based when I get around to it)
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* for representing a set of ranges on a number-line.
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*/
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class nsIntervalSet {
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public:
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typedef nscoord coord_type;
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nsIntervalSet(IntervalSetAlloc aAlloc, IntervalSetFree aFree,
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void* aAllocatorClosure);
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~nsIntervalSet();
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/*
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* Include the interval [aBegin, aEnd] in the set.
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*
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* Removal of intervals added is not supported because that would
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* require keeping track of the individual intervals that were
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* added (nsIntervalMap should do that). It would be simple to
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* implement ExcludeInterval if anyone wants it, though.
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*/
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void IncludeInterval(coord_type aBegin, coord_type aEnd);
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/*
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* Is the point aPoint contained within the set of intervals?
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*/
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PRBool HasPoint(coord_type aPoint) const;
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/*
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* Are _some_ points in [aBegin, aEnd] contained within the set
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* of intervals?
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*/
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PRBool Intersects(coord_type aBegin, coord_type aEnd) const;
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/*
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* Are _all_ points in [aBegin, aEnd] contained within the set
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* of intervals?
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*/
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PRBool Contains(coord_type aBegin, coord_type aEnd) const;
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PRBool IsEmpty() const
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{
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return !mList;
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}
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private:
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class Interval {
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public:
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Interval(coord_type aBegin, coord_type aEnd)
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: mBegin(aBegin),
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mEnd(aEnd),
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mPrev(nsnull),
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mNext(nsnull)
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{
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}
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coord_type mBegin;
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coord_type mEnd;
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Interval *mPrev;
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Interval *mNext;
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};
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void FreeInterval(Interval *aInterval);
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Interval *mList;
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IntervalSetAlloc mAlloc;
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IntervalSetFree mFree;
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void *mAllocatorClosure;
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};
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#endif // !defined(nsIntervalSet_h___)
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