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#import <Foundation/Foundation.h>
#import "MGLFoundation.h"
#import "MGLForegroundStyleLayer.h"
NS_ASSUME_NONNULL_BEGIN
/**
`MGLVectorStyleLayer` is an abstract superclass for style layers whose content
is defined by an `MGLShapeSource` or `MGLVectorTileSource` object.
Create instances of `MGLCircleStyleLayer`, `MGLFillStyleLayer`,
`MGLFillExtrusionStyleLayer`, `MGLHeatmapStyleLayer`, `MGLLineStyleLayer`, and
`MGLSymbolStyleLayer` in order to use `MGLVectorStyleLayer`'s properties and
methods. Do not create instances of `MGLVectorStyleLayer` directly, and do not
create your own subclasses of this class.
*/
MGL_EXPORT
@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;
/**
The style layer’s predicate.
Use the style layer’s predicate to include only the features in the source
layer that satisfy a condition that you define. If the style layer initially
comes from the style, its predicate corresponds to the
<a href="https://www.mapbox.com/mapbox-gl-style-spec/#layer-filter">`filter`</a>
property in the style JSON.
See the “<a href="../predicates-and-expressions.html">Predicates and Expressions</a>”
guide for details about the predicate syntax supported by this class.
### Example
To filter the layer to include only the features whose `index` attribute is 5
or 10 and whose `ele` attribute is at least 1,500, you could create an
`NSCompoundPredicate` along these lines:
```swift
let layer = MGLLineStyleLayer(identifier: "contour", source: terrain)
layer.sourceLayerIdentifier = "contours"
layer.predicate = NSPredicate(format: "(index == 5 || index == 10) && CAST(ele, 'NSNumber') >= 1500.0")
mapView.style?.addLayer(layer)
```
*/
@property (nonatomic, nullable) NSPredicate *predicate;
@end
NS_ASSUME_NONNULL_END
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