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#import <Foundation/Foundation.h>
#import "MGLBaseStyleLayer.h"
NS_ASSUME_NONNULL_BEGIN
@class MGLSource;
/**
`MGLForegroundStyleLayer` is an abstract superclass for style layers whose
content is defined by an `MGLSource` object.
Do not create instances of this class directly, and do not create your own
subclasses of this class. Instead, create instances of `MGLRasterStyleLayer`
and the concrete subclasses of `MGLVectorStyleLayer`.
*/
@interface MGLForegroundStyleLayer : MGLStyleLayer
#pragma mark Initializing a Style Layer
/**
Returns a foreground style layer initialized with an identifier and source.
After initializing and configuring the style layer, add it to a map view’s
style using the `-[MGLStyle addLayer:]` or
`-[MGLStyle insertLayer:belowLayer:]` method.
@param identifier A string that uniquely identifies the source in the style to
which it is added.
@param source The source from which to obtain the data to style. If the source
has not yet been added to the current style, the behavior is undefined.
@return An initialized foreground style layer.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier source:(MGLSource *)source NS_DESIGNATED_INITIALIZER;
#pragma mark Specifying a Style Layer’s Content
/**
Identifier of the source from which the receiver obtains the data to style.
*/
@property (nonatomic, readonly, nullable) NSString *sourceIdentifier;
@end
/**
`MGLVectorStyleLayer` is an abstract superclass for style layers whose content
is defined by an `MGLGeoJSONSource` or `MGLVectorSource` object.
Do not create instances of this class directly, and do not create your own
subclasses of this class. Instead, create instances of the following concrete
subclasses: `MGLCircleStyleLayer`, `MGLFillStyleLayer`, `MGLLineStyleLayer`,
and `MGLSymbolStyleLayer`.
*/
@interface MGLVectorStyleLayer : MGLForegroundStyleLayer
#pragma mark Refining a Style Layer’s Content
/**
Identifier of the layer within the source identified by the `sourceIdentifier`
property from which the receiver obtains the data to style.
*/
@property (nonatomic, nullable) NSString *sourceLayerIdentifier;
/**
A predicate that corresponds to the layer's <a href='https://www.mapbox.com/mapbox-gl-style-spec/#types-filter'>filter</a>.
The predicate's left expression must be a string that identifies a feature
property, or one of the special keys.
*/
@property (nonatomic, nullable) NSPredicate *predicate;
@end
NS_ASSUME_NONNULL_END
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