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#pragma once
#include <mbgl/util/peer.hpp>
#include <mbgl/util/immutable.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/style/layer_type.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/style/conversion.hpp>
#include <cassert>
#include <memory>
#include <string>
#include <stdexcept>
namespace mbgl {
namespace style {
class LayerObserver;
class Filter;
/**
* @brief Holds static data for a certain layer type.
*/
struct LayerTypeInfo {
/**
* @brief contains the layer type as defined in the style specification;
*/
const char* type;
/**
* @brief contains \c SourceRequired if the corresponding layer type requires source;
* contains \c SourceNotRequired otherwise.
*/
const enum { SourceRequired, SourceNotRequired } source;
};
/**
* 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, calling `LayerManager`:
*
* auto circleLayer = LayerManager::get()->createLayer("circle", ...);
*/
class Layer {
public:
Layer(const Layer& ) = delete;
Layer& operator=(const Layer&) = delete;
virtual ~Layer();
// Note: LayerType is deprecated, do not use it.
LayerType getType() const;
std::string getID() const;
// Source
std::string getSourceID() const;
std::string getSourceLayer() const;
void setSourceLayer(const std::string& sourceLayer);
// Filter
const Filter& getFilter() const;
void setFilter(const Filter&);
// Visibility
VisibilityType getVisibility() const;
void setVisibility(VisibilityType);
// Zoom range
float getMinZoom() const;
float getMaxZoom() const;
void setMinZoom(float);
void setMaxZoom(float);
// Dynamic properties
virtual optional<conversion::Error> setLayoutProperty(const std::string& name, const conversion::Convertible& value) = 0;
virtual optional<conversion::Error> setPaintProperty(const std::string& name, const conversion::Convertible& value) = 0;
optional<conversion::Error> setVisibility(const conversion::Convertible& value);
// Private implementation
// TODO : We should not have public mutable data members.
class Impl;
Immutable<Impl> baseImpl;
// Create a layer, copying all properties except id and paint properties from this layer.
virtual std::unique_ptr<Layer> cloneRef(const std::string& id) const = 0;
void setObserver(LayerObserver*);
// For use in SDK bindings, which store a reference to a platform-native peer
// object here, so that separately-obtained references to this object share
// identical platform-native peers.
util::peer peer;
Layer(Immutable<Impl>);
const LayerTypeInfo* getTypeInfo() const noexcept;
protected:
virtual Mutable<Impl> mutableBaseImpl() const = 0;
LayerObserver* observer;
};
/**
* @brief The LayerFactory abstract class
*
* This class is responsible for creation of the layer objects that belong to a concrete layer type.
*/
class LayerFactory {
public:
virtual ~LayerFactory() = default;
/// Returns the layer type data.
virtual const LayerTypeInfo* getTypeInfo() const noexcept = 0;
/// Returns a new Layer instance on success call; returns `nulltptr` otherwise.
virtual std::unique_ptr<Layer> createLayer(const std::string& id, const conversion::Convertible& value) = 0;
protected:
optional<std::string> getSource(const conversion::Convertible& value) const noexcept;
bool initSourceLayerAndFilter(Layer*, const conversion::Convertible& value) const noexcept;
};
/**
* @brief A singleton class forwarding calls to the corresponding \c LayerFactory instance.
*/
class LayerManager {
public:
/**
* @brief A singleton getter.
*
* @return LayerManager*
*/
static LayerManager* get() noexcept;
virtual ~LayerManager() = default;
/// Returns a new Layer instance on success call; returns `nulltptr` otherwise.
virtual std::unique_ptr<Layer> createLayer(const std::string& type, const std::string& id, const conversion::Convertible& value, conversion::Error& error) noexcept = 0;
protected:
LayerManager() = default;
};
} // namespace style
} // namespace mbgl
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