summaryrefslogtreecommitdiff
path: root/dom/html/TimeRanges.h
blob: 526beb0f7b7278fc6efd7b74f5f97c6666225629 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_TimeRanges_h_
#define mozilla_dom_TimeRanges_h_

#include "nsCOMPtr.h"
#include "nsIDOMTimeRanges.h"
#include "nsISupports.h"
#include "nsTArray.h"
#include "nsWrapperCache.h"
#include "mozilla/ErrorResult.h"

namespace mozilla {
namespace dom {

class TimeRanges;

} // namespace dom

namespace dom {

// Implements media TimeRanges:
// http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#timeranges
class TimeRanges final : public nsIDOMTimeRanges,
                         public nsWrapperCache
{
public:
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(TimeRanges)
  NS_DECL_NSIDOMTIMERANGES

  TimeRanges();
  explicit TimeRanges(nsISupports* aParent);

  void Add(double aStart, double aEnd);

  // Returns the start time of the first range, or -1 if no ranges exist.
  double GetStartTime();

  // Returns the end time of the last range, or -1 if no ranges exist.
  double GetEndTime();

  // See http://www.whatwg.org/html/#normalized-timeranges-object
  void Normalize(double aTolerance = 0.0);

  // Mutate this TimeRange to be the union of this and aOtherRanges.
  void Union(const TimeRanges* aOtherRanges, double aTolerance);

  // Mutate this TimeRange to be the intersection of this and aOtherRanges.
  void Intersection(const TimeRanges* aOtherRanges);

  virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;

  nsISupports* GetParentObject() const;

  uint32_t Length() const
  {
    return mRanges.Length();
  }

  virtual double Start(uint32_t aIndex, ErrorResult& aRv);

  virtual double End(uint32_t aIndex, ErrorResult& aRv);

  // Shift all values by aOffset seconds.
  void Shift(double aOffset);

private:
  ~TimeRanges();

  // Comparator which orders TimeRanges by start time. Used by Normalize().
  struct TimeRange
  {
    TimeRange(double aStart, double aEnd)
      : mStart(aStart),
        mEnd(aEnd) {}
    double mStart;
    double mEnd;
  };

  struct CompareTimeRanges
  {
    bool Equals(const TimeRange& aTr1, const TimeRange& aTr2) const {
      return aTr1.mStart == aTr2.mStart && aTr1.mEnd == aTr2.mEnd;
    }

    bool LessThan(const TimeRange& aTr1, const TimeRange& aTr2) const {
      return aTr1.mStart < aTr2.mStart;
    }
  };

  AutoTArray<TimeRange,4> mRanges;

  nsCOMPtr<nsISupports> mParent;

public:
  typedef nsTArray<TimeRange>::index_type index_type;
  static const index_type NoIndex = index_type(-1);

  index_type Find(double aTime, double aTolerance = 0);

  bool Contains(double aStart, double aEnd) {
    index_type target = Find(aStart);
    if (target == NoIndex) {
      return false;
    }

    return mRanges[target].mEnd >= aEnd;
  }
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_TimeRanges_h_