transition_options.hpp

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#pragma once
 
#include <mbgl/util/chrono.hpp>
 
#include <mapbox/compatibility/value.hpp>
 
#include <optional>
 
namespace mbgl {
namespace style {
 
class TransitionOptions {
public:
    std::optional<Duration> duration;
    std::optional<Duration> delay;
    bool enablePlacementTransitions;
 
    TransitionOptions(std::optional<Duration> duration_ = std::nullopt,
                      std::optional<Duration> delay_ = std::nullopt,
                      bool enablePlacementTransitions_ = true)
        : duration(std::move(duration_)),
          delay(std::move(delay_)),
          enablePlacementTransitions(enablePlacementTransitions_) {}
 
    TransitionOptions reverseMerge(const TransitionOptions& defaults) const {
        return {
            duration ? duration : defaults.duration,
            delay ? delay : defaults.delay,
            enablePlacementTransitions
        };
    }
 
    bool isDefined() const {
        return duration || delay;
    }
 
    mapbox::base::Value serialize() const {
        mapbox::base::ValueObject result;
        if (duration) {
            result.emplace("duration", std::chrono::duration_cast<std::chrono::milliseconds>(*duration).count());
        }
        if (delay) {
            result.emplace("delay", std::chrono::duration_cast<std::chrono::milliseconds>(*delay).count());
        }
        return result;
    }
};
 
} // namespace style
} // namespace mbgl