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#ifndef MBGL_LAYER
#define MBGL_LAYER
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/style/types.hpp>
#include <memory>
namespace mbgl {
/**
* The runtime representation of a [layer](https://www.mapbox.com/mapbox-gl-style-spec/#layers) from the Mapbox Style
* Specification.
*
* `Layer` is an abstract base class; concrete derived classes are provided for each layer type. `Layer` contains
* functionality that is common to all layer types:
*
* * Runtime type information: type predicates and casting
* * Accessors for properties common to all layer types: ID, visibility, etc.
* * Cloning and copying
*
* All other functionality lives in the derived classes. To instantiate a layer, create an instance of the desired
* type, passing the ID:
*
* auto circleLayer = std::make_unique<CircleLayer>("my-circle-layer");
*/
class Layer : public mbgl::util::noncopyable {
public:
virtual ~Layer();
// Check whether this layer is of the given subtype.
template <class T>
bool is() const;
// Dynamically cast this layer to the given subtype.
template <class T>
T* as() {
return is<T>() ? reinterpret_cast<T*>(this) : nullptr;
}
template <class T>
const T* as() const {
return is<T>() ? reinterpret_cast<const T*>(this) : nullptr;
}
const std::string& getID() const;
// Visibility
VisibilityType getVisibility() const;
void setVisibility(VisibilityType);
// Zoom range
float getMinZoom() const;
void setMinZoom(float) const;
float getMaxZoom() const;
void setMaxZoom(float) const;
// Create a new layer with the specified `id` and `ref`. All other properties
// are copied from this layer.
std::unique_ptr<Layer> copy(const std::string& id,
const std::string& ref) const;
// Private implementation
class Impl;
const std::unique_ptr<Impl> baseImpl;
protected:
enum class Type {
Fill,
Line,
Circle,
Symbol,
Raster,
Background,
Custom,
};
const Type type;
Layer(Type, std::unique_ptr<Impl>);
};
} // namespace mbgl
#endif
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