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#pragma once
#include <mbgl/style/property_value.hpp>
#include <mbgl/style/data_driven_property_value.hpp>
#include <mbgl/style/property_evaluator.hpp>
#include <mbgl/style/data_driven_property_evaluator.hpp>
#include <mbgl/util/indexed_tuple.hpp>
namespace mbgl {
namespace style {
class PropertyEvaluationParameters;
template <class T>
class LayoutProperty {
public:
using UnevaluatedType = PropertyValue<T>;
using EvaluatorType = PropertyEvaluator<T>;
using EvaluatedType = T;
using Type = T;
};
template <class T>
class DataDrivenLayoutProperty {
public:
using UnevaluatedType = DataDrivenPropertyValue<T>;
using EvaluatorType = DataDrivenPropertyEvaluator<T>;
using EvaluatedType = PossiblyEvaluatedPropertyValue<T>;
using Type = T;
};
template <class... Ps>
class LayoutProperties {
public:
using Properties = TypeList<Ps...>;
using EvaluatedTypes = TypeList<typename Ps::EvaluatedType...>;
using UnevaluatedTypes = TypeList<typename Ps::UnevaluatedType...>;
template <class TypeList>
using Tuple = IndexedTuple<Properties, TypeList>;
class Evaluated : public Tuple<EvaluatedTypes> {
public:
using Tuple<EvaluatedTypes>::Tuple;
template <class P>
typename P::Type evaluate(float z, const GeometryTileFeature& feature) const {
using T = typename P::Type;
return this->template get<P>().match(
[&] (const T& t) { return t; },
[&] (const SourceFunction<T>& t) { return t.evaluate(feature, P::defaultValue()); },
[&] (const CompositeFunction<T>& t) { return t.evaluate(z, feature, P::defaultValue()); });
}
};
class Unevaluated : public Tuple<UnevaluatedTypes> {
public:
using Tuple<UnevaluatedTypes>::Tuple;
};
template <class P>
auto evaluate(const PropertyEvaluationParameters& parameters) const {
using Evaluator = typename P::EvaluatorType;
return unevaluated.template get<P>()
.evaluate(Evaluator(parameters, P::defaultValue()));
}
Evaluated evaluate(const PropertyEvaluationParameters& parameters) const {
return Evaluated {
evaluate<Ps>(parameters)...
};
}
Unevaluated unevaluated;
};
} // namespace style
} // namespace mbgl
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