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