1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ 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 typedef void * 15 (* IntervalSetAlloc)(size_t aBytes, void *aClosure); 16 17 typedef void 18 (* IntervalSetFree) (size_t aBytes, void *aPtr, void *aClosure); 19 20 /* 21 * A list-based class (hopefully tree-based when I get around to it) 22 * for representing a set of ranges on a number-line. 23 */ 24 class nsIntervalSet { 25 26 public: 27 28 typedef nscoord coord_type; 29 30 nsIntervalSet(IntervalSetAlloc aAlloc, IntervalSetFree aFree, 31 void* aAllocatorClosure); 32 ~nsIntervalSet(); 33 34 /* 35 * Include the interval [aBegin, aEnd] in the set. 36 * 37 * Removal of intervals added is not supported because that would 38 * require keeping track of the individual intervals that were 39 * added (nsIntervalMap should do that). It would be simple to 40 * implement ExcludeInterval if anyone wants it, though. 41 */ 42 void IncludeInterval(coord_type aBegin, coord_type aEnd); 43 44 /* 45 * Are _some_ points in [aBegin, aEnd] contained within the set 46 * of intervals? 47 */ 48 bool Intersects(coord_type aBegin, coord_type aEnd) const; 49 50 /* 51 * Are _all_ points in [aBegin, aEnd] contained within the set 52 * of intervals? 53 */ Area(nsIContent * aArea)54 bool Contains(coord_type aBegin, coord_type aEnd) const; 55 56 bool IsEmpty() const 57 { 58 return !mList; 59 } 60 61 private: 62 ~Area()63 class Interval { 64 65 public: 66 Interval(coord_type aBegin, coord_type aEnd) 67 : mBegin(aBegin), 68 mEnd(aEnd), 69 mPrev(nullptr), 70 mNext(nullptr) 71 { 72 } 73 74 coord_type mBegin; 75 coord_type mEnd; 76 Interval *mPrev; 77 Interval *mNext; 78 }; 79 80 void FreeInterval(Interval *aInterval); logMessage(nsIContent * aContent,const nsAString & aCoordsSpec,int32_t aFlags,const char * aMessageName)81 82 Interval *mList; 83 IntervalSetAlloc mAlloc; 84 IntervalSetFree mFree; 85 void *mAllocatorClosure; 86 87 }; 88 89 #endif // !defined(nsIntervalSet_h___) 90