| // Copyright 2015 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_DOM_TIME_RANGES_H_ |
| #define COBALT_DOM_TIME_RANGES_H_ |
| |
| #include <vector> |
| |
| #include "cobalt/script/exception_state.h" |
| #include "cobalt/script/wrappable.h" |
| |
| namespace cobalt { |
| namespace dom { |
| |
| // The TimeRanges interface is used to describe a series of time ranges. Each of |
| // them has a start time and an end time. |
| // https://www.w3.org/TR/html50/embedded-content-0.html#timeranges |
| // |
| // Note that in our implementation it is always normalized, i.e. all contained |
| // ranges are sorted ascendantly and not overlapped. The limits of the range |
| // are [-Infinity, Infinity]. |
| class TimeRanges : public script::Wrappable { |
| public: |
| TimeRanges() {} |
| TimeRanges(double start, double end) { Add(start, end); } |
| |
| // Web API: TimeRanges |
| // |
| uint32 length() const { return static_cast<uint32>(ranges_.size()); } |
| double Start(uint32 index, script::ExceptionState* exception_state) const; |
| double End(uint32 index, script::ExceptionState* exception_state) const; |
| |
| // Custom, not in any spec. |
| // |
| // If the time is contained inside any range. |
| bool Contains(double time) const; |
| // Add the range into the ranges. Merge overlapping ranges if necessary. |
| void Add(double start, double end); |
| // Returns time if Contain(time) is true. Otherwise returns a time in the |
| // ranges that is closest to time. |
| double Nearest(double time) const; |
| |
| // Returns a copy of the current object. |
| scoped_refptr<TimeRanges> Clone() const; |
| // Returns a TimeRanges object contains the union of the current object and |
| // |that|. |
| scoped_refptr<TimeRanges> UnionWith( |
| const scoped_refptr<TimeRanges>& that) const; |
| // Returns a TimeRanges object contains the intersection of the current object |
| // and |that|. |
| scoped_refptr<TimeRanges> IntersectWith( |
| const scoped_refptr<TimeRanges>& that) const; |
| |
| DEFINE_WRAPPABLE_TYPE(TimeRanges); |
| |
| private: |
| scoped_refptr<TimeRanges> Invert() const; |
| |
| class TimeRange { |
| public: |
| TimeRange(double start, double end) : start_(start), end_(end) {} |
| |
| double start() const { return start_; } |
| double end() const { return end_; } |
| |
| bool IsOverlapped(const TimeRange& that) const; |
| void MergeWith(const TimeRange& that); |
| bool Contains(double time) const { return start_ <= time && time <= end_; } |
| |
| private: |
| double start_; |
| double end_; |
| }; |
| |
| // Compare functor for std::lower_bound. |
| static bool LessThan(const TimeRange& range, double time) { |
| return range.end() < time; |
| } |
| |
| std::vector<TimeRange> ranges_; |
| }; |
| |
| } // namespace dom |
| } // namespace cobalt |
| |
| #endif // COBALT_DOM_TIME_RANGES_H_ |