75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
#pragma once
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#include <mbgl/style/layer.hpp>
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#include <mbgl/style/types.hpp>
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#include <mbgl/style/filter.hpp>
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#include <rapidjson/writer.h>
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#include <rapidjson/stringbuffer.h>
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#include <limits>
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#include <memory>
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#include <string>
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#include <vector>
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namespace mbgl {
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namespace style {
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/**
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* `Layer::Impl` contains the internal implementation of `Layer`: the details
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* that need to be accessible to other parts of the code, but hidden from the
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* public API. Like `Layer`, it is an abstract base class, with derived classes
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* for each layer type.
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*
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* Members that are public in `Layer` are part of the public API for all layers.
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* Members that are public in `FooLayer` are part of the public API for "foo"
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* layers. Members that are public in `Layer::Impl` are part of the internal API
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* for all layers. Members that are public in `FooLayer::Impl` are part of the
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* internal API for "foo" layers. Members that are private in `FooLayer::Impl`
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* are internal to "foo" layers.
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*/
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class Layer::Impl {
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public:
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Impl(std::string layerID, std::string sourceID);
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virtual ~Impl() = default;
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Impl& operator=(const Impl&) = delete;
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// Returns true buckets if properties affecting layout have changed: i.e.
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// filter, visibility, layout properties, or data-driven paint properties.
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virtual bool hasLayoutDifference(const Layer::Impl&) const = 0;
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// Utility function for automatic layer grouping.
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virtual void stringifyLayout(rapidjson::Writer<rapidjson::StringBuffer>&) const = 0;
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// Returns pointer to the statically allocated layer type info structure.
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virtual const LayerTypeInfo* getTypeInfo() const noexcept = 0;
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// Populates the given \a fontStack with fonts being used by the layer.
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virtual void populateFontStack(std::set<FontStack>& fontStack) const;
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/// Collect the style dependencies for this layer
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virtual expression::Dependency getDependencies() const noexcept { return expression::Dependency::None; }
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std::string id;
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std::string source;
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std::string sourceLayer;
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Filter filter;
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float minZoom = -std::numeric_limits<float>::infinity();
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float maxZoom = std::numeric_limits<float>::infinity();
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VisibilityType visibility = VisibilityType::Visible;
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protected:
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Impl(const Impl&) = default;
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};
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// To be used in the inherited classes.
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#define DECLARE_LAYER_TYPE_INFO \
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const LayerTypeInfo* getTypeInfo() const noexcept final { \
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return staticTypeInfo(); \
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} \
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static const LayerTypeInfo* staticTypeInfo() noexcept
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} // namespace style
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} // namespace mbgl
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