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90 lines
2.2 KiB
C++
90 lines
2.2 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* a set of ranges on a number-line */
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#ifndef nsIntervalSet_h___
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#define nsIntervalSet_h___
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#include "nsCoord.h"
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typedef void *
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(* IntervalSetAlloc)(size_t aBytes, void *aClosure);
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typedef void
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(* 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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* Are _some_ points in [aBegin, aEnd] contained within the set
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* of intervals?
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*/
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bool 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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bool Contains(coord_type aBegin, coord_type aEnd) const;
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bool 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(nullptr),
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mNext(nullptr)
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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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