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#import <Foundation/Foundation.h>
#import "MGLFoundation.h"
#import "MGLTypes.h"
NS_ASSUME_NONNULL_BEGIN
FOUNDATION_EXTERN MGL_EXPORT MGLExceptionName const MGLInvalidStyleLayerException;
/**
`MGLStyleLayer` is an abstract base class for style layers. A style layer
manages the layout and appearance of content at a specific z-index in a style.
An `MGLStyle` object consists of one or more `MGLStyleLayer` objects.
Each style layer defined by the style JSON file is represented at runtime by an
`MGLStyleLayer` object, which you can use to refine the map’s appearance. You
can also add and remove style layers dynamically.
Create instances of `MGLBackgroundStyleLayer` and the concrete subclasses of
`MGLForegroundStyleLayer` in order to use `MGLStyleLayer`'s properties and methods.
You do not create instances of `MGLStyleLayer` directly, and do not
create your own subclasses of this class.
Do not add `MGLStyleLayer` objects to the `style` property of a `MGLMapView` before
`-mapView:didFinishLoadingStyle:` is called.
*/
MGL_EXPORT
@interface MGLStyleLayer : NSObject
#pragma mark Initializing a Style Layer
- (instancetype)init __attribute__((unavailable("Use -init methods of concrete subclasses instead.")));
#pragma mark Identifying a Style Layer
/**
A string that uniquely identifies the style layer in the style to which it is
added.
*/
@property (nonatomic, copy, readonly) NSString *identifier;
#pragma mark Configuring a Style Layer’s Visibility
/**
Whether this layer is displayed. A value of `NO` hides the layer.
*/
@property (nonatomic, assign, getter=isVisible) BOOL visible;
/**
The maximum zoom level at which the layer gets parsed and appears. This value is a floating-point number.
*/
@property (nonatomic, assign) float maximumZoomLevel;
/**
The minimum zoom level at which the layer gets parsed and appears. This value is a floating-point number.
*/
@property (nonatomic, assign) float minimumZoomLevel;
@end
NS_ASSUME_NONNULL_END
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