nsIntervalSet.h (1931B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 // vim:cindent:ts=8:et:sw=4: 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* a set of ranges on a number-line */ 8 9 #ifndef nsIntervalSet_h___ 10 #define nsIntervalSet_h___ 11 12 #include "nsCoord.h" 13 14 namespace mozilla { 15 class PresShell; 16 } // namespace mozilla 17 18 /* 19 * A list-based class (hopefully tree-based when I get around to it) 20 * for representing a set of ranges on a number-line. 21 */ 22 class nsIntervalSet { 23 public: 24 typedef nscoord coord_type; 25 26 explicit nsIntervalSet(mozilla::PresShell* aPresShell); 27 ~nsIntervalSet(); 28 29 /* 30 * Include the interval [aBegin, aEnd] in the set. 31 * 32 * Removal of intervals added is not supported because that would 33 * require keeping track of the individual intervals that were 34 * added (nsIntervalMap should do that). It would be simple to 35 * implement ExcludeInterval if anyone wants it, though. 36 */ 37 void IncludeInterval(coord_type aBegin, coord_type aEnd); 38 39 /* 40 * Are _some_ points in [aBegin, aEnd] contained within the set 41 * of intervals? 42 */ 43 bool Intersects(coord_type aBegin, coord_type aEnd) const; 44 45 /* 46 * Are _all_ points in [aBegin, aEnd] contained within the set 47 * of intervals? 48 */ 49 bool Contains(coord_type aBegin, coord_type aEnd) const; 50 51 bool IsEmpty() const { return !mList; } 52 53 private: 54 class Interval { 55 public: 56 Interval(coord_type aBegin, coord_type aEnd) 57 : mBegin(aBegin), mEnd(aEnd), mPrev(nullptr), mNext(nullptr) {} 58 59 coord_type mBegin; 60 coord_type mEnd; 61 Interval* mPrev; 62 Interval* mNext; 63 }; 64 65 void* AllocateInterval(); 66 void FreeInterval(Interval* aInterval); 67 68 Interval* mList; 69 mozilla::PresShell* mPresShell; 70 }; 71 72 #endif // !defined(nsIntervalSet_h___)