MapLibreParticleLab/platform/ios/src/MLNMapViewDelegate.h

#import <UIKit/UIKit.h>

#import "MLNCameraChangeReason.h"
#import "Mapbox.h"

NS_ASSUME_NONNULL_BEGIN

@class MLNMapView;
@class MLNUserLocationAnnotationViewStyle;

/**
 The ``MLNMapViewDelegate`` protocol defines a set of optional methods that you
 can use to receive map-related update messages. Because many map operations
 require the ``MLNMapView`` class to load data asynchronously, the map view calls
 these methods to notify your application when specific operations complete. The
 map view also uses these methods to request information about annotations
 displayed on the map, such as the styles and interaction modes to apply to
 individual annotations.
 */
@protocol MLNMapViewDelegate <NSObject>

@optional

// MARK: Responding to Map Position Changes

/**
 Asks the delegate whether the map view should be allowed to change from the
 existing camera to the new camera in response to a user gesture.

 This method is called as soon as the user gesture is recognized. It is not
 called in response to a programmatic camera change, such as by setting the
 `centerCoordinate` property or calling `-flyToCamera:completionHandler:`.

 This method is called many times during gesturing, so you should avoid performing
 complex or performance-intensive tasks in your implementation.

 @param mapView The map view that the user is manipulating.
 @param oldCamera The camera representing the viewpoint at the moment the
 gesture is recognized. If this method returns `NO`, the map view’s camera
 continues to be this camera.
 @param newCamera The expected camera after the gesture completes. If this
 method returns `YES`, this camera becomes the map view’s camera.
 @return A Boolean value indicating whether the map view should stay at
 `oldCamera` or change to `newCamera`.

 #### Related examples
 - <doc:BlockingGesturesExample>
 */
- (BOOL)mapView:(MLNMapView *)mapView
    shouldChangeFromCamera:(MLNMapCamera *)oldCamera
                  toCamera:(MLNMapCamera *)newCamera;

/**
 :nodoc:
 Asks the delegate whether the map view should be allowed to change from the
 existing camera to the new camera in response to a user gesture.

 This method is called as soon as the user gesture is recognized. It is not
 called in response to a programmatic camera change, such as by setting the
 `centerCoordinate` property or calling `-flyToCamera:completionHandler:`.

 This method is called many times during gesturing, so you should avoid performing
 complex or performance-intensive tasks in your implementation.

 @param mapView The map view that the user is manipulating.
 @param oldCamera The camera representing the viewpoint at the moment the
 gesture is recognized. If this method returns `NO`, the map view’s camera
 continues to be this camera.
 @param newCamera The expected camera after the gesture completes. If this
 method returns `YES`, the viewport of the map will transition to the new camera. Note that the new
 camera cannot be modified.
 @param reason The reason for the camera change.
 @return A Boolean value indicating whether the map view should stay at
 `oldCamera` or transition to `newCamera`.

 > Note: If this method is implemented `-mapView:shouldChangeFromCamera:toCamera:` will not be
 called.
 */
- (BOOL)mapView:(MLNMapView *)mapView
    shouldChangeFromCamera:(MLNMapCamera *)oldCamera
                  toCamera:(MLNMapCamera *)newCamera
                    reason:(MLNCameraChangeReason)reason;

/**
 Tells the delegate that the viewpoint depicted by the map view is about to change.

 This method is called whenever the currently displayed map camera will start
 changing for any reason.

 @param mapView The map view whose viewpoint will change.
 @param animated Whether the change will cause an animated effect on the map.
 */
- (void)mapView:(MLNMapView *)mapView regionWillChangeAnimated:(BOOL)animated;

/**
 :nodoc:
 Tells the delegate that the viewpoint depicted by the map view is about to change.

 This method is called whenever the currently displayed map camera will start
 changing for any reason.

 @param mapView The map view whose viewpoint will change.
 @param animated Whether the change will cause an animated effect on the map.
 @param reason The reason for the camera change.

 > Note: If this method is implemented `-mapView:regionWillChangeAnimated:` will not be called.
 */
- (void)mapView:(MLNMapView *)mapView
    regionWillChangeWithReason:(MLNCameraChangeReason)reason
                      animated:(BOOL)animated;

/**
 Tells the delegate that the viewpoint depicted by the map view is changing.

 This method is called as the currently displayed map camera changes as part of
 an animation, whether due to a user gesture or due to a call to a method such
 as ``MLNMapView/setCamera:animated:``. This method can be called before
 `-mapViewDidFinishLoadingMap:` is called.

 During the animation, this method may be called many times to report updates to
 the viewpoint. Therefore, your implementation of this method should be as lightweight
 as possible to avoid affecting performance.

 @param mapView The map view whose viewpoint is changing.

 #### Related examples
 TODO: Cluster point data, learn how to trigger an action whenever
 the map region changes.
 */
- (void)mapViewRegionIsChanging:(MLNMapView *)mapView;

/**
 :nodoc:
 Tells the delegate that the viewpoint depicted by the map view is changing.

 This method is called as the currently displayed map camera changes as part of
 an animation, whether due to a user gesture or due to a call to a method such
 as ``MLNMapView/setCamera:animated:``. This method can be called before
 `-mapViewDidFinishLoadingMap:` is called.

 During the animation, this method may be called many times to report updates to
 the viewpoint. Therefore, your implementation of this method should be as lightweight
 as possible to avoid affecting performance.

 @param mapView The map view whose viewpoint is changing.
 @param reason The reason for the camera change.

 > Note: If this method is implemented `-mapViewRegionIsChanging:` will not be called.
 */
- (void)mapView:(MLNMapView *)mapView regionIsChangingWithReason:(MLNCameraChangeReason)reason;

/**
 Tells the delegate that the viewpoint depicted by the map view has finished
 changing.

 This method is called whenever the currently displayed map camera has finished
 changing, after any calls to `-mapViewRegionIsChanging:` due to animation. Therefore,
 this method can be called before `-mapViewDidFinishLoadingMap:` is called.

 @param mapView The map view whose viewpoint has changed.
 @param animated Whether the change caused an animated effect on the map.
 */
- (void)mapView:(MLNMapView *)mapView regionDidChangeAnimated:(BOOL)animated;

/**
 :nodoc:
 Tells the delegate that the viewpoint depicted by the map view has finished
 changing.

 This method is called whenever the currently displayed map camera has finished
 changing, after any calls to `-mapViewRegionIsChanging:` due to animation. Therefore,
 this method can be called before `-mapViewDidFinishLoadingMap:` is called.

 @param mapView The map view whose viewpoint has changed.
 @param animated Whether the change caused an animated effect on the map.
 @param reason The reason for the camera change.

 > Note: If this method is implemented `-mapView:regionDidChangeAnimated:` will not be called.
 */
- (void)mapView:(MLNMapView *)mapView
    regionDidChangeWithReason:(MLNCameraChangeReason)reason
                     animated:(BOOL)animated;

// MARK: Loading the Map

/**
 Tells the delegate that the map view will begin to load.

 This method is called whenever the map view starts loading, including when a
 new style has been set and the map must reload.

 @param mapView The map view that is starting to load.
 */
- (void)mapViewWillStartLoadingMap:(MLNMapView *)mapView;

/**
 Tells the delegate that the map view has finished loading.

 This method is called whenever the map view finishes loading, either after the
 initial load or after a style change has forced a reload.

 @param mapView The map view that has finished loading.
 */
- (void)mapViewDidFinishLoadingMap:(MLNMapView *)mapView;

/**
 Tells the delegate that the map view was unable to load data needed for
 displaying the map.

 This method may be called for a variety of reasons, including a network
 connection failure or a failure to fetch the style from the server. You can use
 the given error message to notify the user that map data is unavailable.

 @param mapView The map view that is unable to load the data.
 @param error The reason the data could not be loaded.
 */
- (void)mapViewDidFailLoadingMap:(MLNMapView *)mapView withError:(NSError *)error;

// TODO
- (void)mapViewWillStartRenderingMap:(MLNMapView *)mapView;

// TODO
- (void)mapViewDidFinishRenderingMap:(MLNMapView *)mapView fullyRendered:(BOOL)fullyRendered;

/**
 Tells the delegate that the map view is about to redraw.

 This method is called any time the map view needs to redraw due to a change in
 the viewpoint or style property transition. This method may be called very
 frequently, even moreso than `-mapViewRegionIsChanging:`. Therefore, your
 implementation of this method should be as lightweight as possible to avoid
 affecting performance.

 @param mapView The map view that is about to redraw.
 */
- (void)mapViewWillStartRenderingFrame:(MLNMapView *)mapView;

/**
 Tells the delegate that the map view has just redrawn.

 This method is called any time the map view needs to redraw due to a change in
 the viewpoint or style property transition. This method may be called very
 frequently, even moreso than `-mapViewRegionIsChanging:`. Therefore, your
 implementation of this method should be as lightweight as possible to avoid
 affecting performance.

 @param mapView The map view that has just redrawn.
 @param fullyRendered A Boolean value indicating whether the map is fully rendered or not.
 */
- (void)mapViewDidFinishRenderingFrame:(MLNMapView *)mapView fullyRendered:(BOOL)fullyRendered;
/**
 Tells the delegate that the map view has just redrawn.

 This method is called any time the map view needs to redraw due to a change in
 the viewpoint or style property transition. This method may be called very
 frequently, even moreso than `-mapViewRegionIsChanging:`. Therefore, your
 implementation of this method should be as lightweight as possible to avoid
 affecting performance.

 @param mapView The map view that has just redrawn.
 @param fullyRendered A Boolean value indicating whether the map is fully rendered or not.
 @param frameEncodingTime The time taken to encode the frame, in milliseconds.
 @param frameRenderingTime The time taken to render the frame, in milliseconds.
 */
- (void)mapViewDidFinishRenderingFrame:(MLNMapView *)mapView
                         fullyRendered:(BOOL)fullyRendered
                     frameEncodingTime:(double)frameEncodingTime
                    frameRenderingTime:(double)frameRenderingTime;
/**
 Tells the delegate that the map view is entering an idle state, and no more
 drawing will be necessary until new data is loaded or there is some interaction
 with the map.

 - No camera transitions are in progress
 - All currently requested tiles have loaded
 - All fade/transition animations have completed

 @param mapView The map view that has just entered the idle state.
 */
- (void)mapViewDidBecomeIdle:(MLNMapView *)mapView;

/**
 Tells the delegate that the map has just finished loading a style.

 This method is called during the initialization of the map view and after any
 subsequent loading of a new style. This method is called between the
 `-mapViewWillStartRenderingMap:` and `-mapViewDidFinishRenderingMap:` delegate
 methods. Changes to sources or layers of the current style do not cause this
 method to be called.

 This method is the earliest opportunity to modify the layout or appearance of
 the current style before the map view is displayed to the user.

 @param mapView The map view that has just loaded a style.
 @param style The style that was loaded.

 #### Related examples
 TODO: Dynamically style interactive points
 TODO: Add multiple shapes from a single shape source examples, learn how to
 ensure a map's style has loaded before modifying it at runtime
 */
- (void)mapView:(MLNMapView *)mapView didFinishLoadingStyle:(MLNStyle *)style;

/**
 Tells the delegate that the `mapView` is missing an image. The image should be added synchronously
 with ``MLNStyle/setImage:forName:`` to be rendered on the current zoom level. When loading icons
 asynchronously, you can load a placeholder image and replace it when your image has loaded.

 @param mapView The map view that is loading the image.
 @param imageName The name of the image that is missing.
 */
- (nullable UIImage *)mapView:(MLNMapView *)mapView didFailToLoadImage:(NSString *)imageName;

/**
 Asks the delegate whether the map view should evict cached images.

 This method is called in two scenarios: when the cumulative size of unused images
 exceeds the cache size or when the last tile that includes the image is removed from
 memory.

 @param mapView The map view that is evicting the image.
 @param imageName The image name that is going to be removed.
 @return A Boolean value indicating whether the map view should evict
 the cached image.
 */
- (BOOL)mapView:(MLNMapView *)mapView shouldRemoveStyleImage:(NSString *)imageName;

// MARK: Tracking User Location

/**
 Tells the delegate that the map view will begin tracking the user’s location.

 This method is called when the value of the `showsUserLocation` property
 changes to `YES`.

 @param mapView The map view that is tracking the user’s location.
 */
- (void)mapViewWillStartLocatingUser:(MLNMapView *)mapView;

/**
 Tells the delegate that the map view has stopped tracking the user’s location.

 This method is called when the value of the `showsUserLocation` property
 changes to `NO`.

 @param mapView The map view that is tracking the user’s location.
 */
- (void)mapViewDidStopLocatingUser:(MLNMapView *)mapView;

/**
 Asks the delegate styling options for each default user location annotation view.

 This method is called many times during gesturing, so you should avoid performing
 complex or performance-intensive tasks in your implementation.

 @param mapView The map view that is tracking the user’s location.
 */
- (MLNUserLocationAnnotationViewStyle *)mapViewStyleForDefaultUserLocationAnnotationView:
    (MLNMapView *)mapView NS_SWIFT_NAME(mapView(styleForDefaultUserLocationAnnotationView:));

/**
 Tells the delegate that the location of the user was updated.

 While the `showsUserLocation` property is set to `YES`, this method is called
 whenever a new location update is received by the map view. This method is also
 called if the map view’s user tracking mode is set to
 ``MLNUserTrackingMode/MLNUserTrackingModeFollowWithHeading`` and the heading changes, or if it is
 set to ``MLNUserTrackingMode/MLNUserTrackingModeFollowWithCourse`` and the course changes.

 This method is not called if the application is currently running in the
 background. If you want to receive location updates while running in the
 background, you must use the Core Location framework.

 @param mapView The map view that is tracking the user’s location.
 @param userLocation The location object representing the user’s latest
    location. This property may be `nil`.
 */
- (void)mapView:(MLNMapView *)mapView
    didUpdateUserLocation:(nullable MLNUserLocation *)userLocation;

/**
 Tells the delegate that an attempt to locate the user’s position failed.

 @param mapView The map view that is tracking the user’s location.
 @param error An error object containing the reason why location tracking
    failed.
 */
- (void)mapView:(MLNMapView *)mapView didFailToLocateUserWithError:(NSError *)error;

/**
 Tells the delegate that the map view’s user tracking mode has changed.

 This method is called after the map view asynchronously changes to reflect the
 new user tracking mode, for example by beginning to zoom or rotate.

 @param mapView The map view that changed its tracking mode.
 @param mode The new tracking mode.
 @param animated Whether the change caused an animated effect on the map.
 */
- (void)mapView:(MLNMapView *)mapView
    didChangeUserTrackingMode:(MLNUserTrackingMode)mode
                     animated:(BOOL)animated;

/**
 Returns a screen coordinate at which to position the user location annotation.
 This coordinate is relative to the map view’s origin after applying the map view’s
 content insets.

 When unimplemented, the user location annotation is aligned within the center of
 the map view with respect to the content insets.

 This method will override any values set by ``MLNMapView/userLocationVerticalAlignment``
 or ``MLNMapView/setUserLocationVerticalAlignment:animated:``.

 @param mapView The map view that is tracking the user's location.
 */
- (CGPoint)mapViewUserLocationAnchorPoint:(MLNMapView *)mapView;

/**
 Tells the delegate that the map's location updates accuracy authorization has changed.

 This method is called after the user changes location accuracy authorization when
 requesting location permissions or in privacy settings.

 @param mapView The map view that changed its location accuracy authorization.
 @param manager The location manager reporting the update.

 */
- (void)mapView:(MLNMapView *)mapView
    didChangeLocationManagerAuthorization:(id<MLNLocationManager>)manager API_AVAILABLE(ios(14));

// MARK: Managing the Appearance of Annotations

/**
 Returns an annotation image object to mark the given point annotation object on
 the map.

 Implement this method to mark a point annotation with a static image. If you
 want to mark a particular point annotation with an annotation view instead,
 omit this method or have it return `nil` for that annotation, then implement
 `-mapView:viewForAnnotation:`.

 Static annotation images use less memory and draw more quickly than annotation
 views. On the other hand, annotation views are compatible with UIKit, Core
 Animation, and other Cocoa Touch frameworks.

 @param mapView The map view that requested the annotation image.
 @param annotation The object representing the annotation that is about to be
    displayed.
 @return The annotation image object to display for the given annotation or
    `nil` if you want to display the default marker image or an annotation view.

 #### Related examples
 TODO: Annotation models
 TODO: Add annotation views and images
 TODO: Mark a place on the map with an image, learn to specify which
 image should be used for ``MLNAnnotation`` objects that have been added to
 your map
 */
- (nullable MLNAnnotationImage *)mapView:(MLNMapView *)mapView
                      imageForAnnotation:(id<MLNAnnotation>)annotation;

/**
 Returns the alpha value to use when rendering a shape annotation.

 A value of `0.0` results in a completely transparent shape. A value of `1.0`,
 the default, results in a completely opaque shape.

 This method sets the opacity of an entire shape, inclusive of its stroke and
 fill. To independently set the values for stroke or fill, specify an alpha
 component in the color returned by `-mapView:strokeColorForShapeAnnotation:` or
 `-mapView:fillColorForPolygonAnnotation:`.

 @param mapView The map view rendering the shape annotation.
 @param annotation The annotation being rendered.
 @return An alpha value between `0` and `1.0`.
 */
- (CGFloat)mapView:(MLNMapView *)mapView alphaForShapeAnnotation:(MLNShape *)annotation;

/**
 Returns the color to use when rendering the outline of a shape annotation.

 The default stroke color is the map view’s tint color. If a pattern color is
 specified, the result is undefined.

 Opacity may be set by specifying an alpha component. The default alpha value is
 `1.0` and results in a completely opaque stroke.

 @param mapView The map view rendering the shape annotation.
 @param annotation The annotation being rendered.
 @return A color to use for the shape outline.

 #### Related examples
 TODO: Annotation models, learn how to modify the outline color of an
 ``MLNShape`` object that has been added to your map as an annotation.
 */
- (UIColor *)mapView:(MLNMapView *)mapView strokeColorForShapeAnnotation:(MLNShape *)annotation;

/**
 Returns the color to use when rendering the fill of a polygon annotation.

 The default fill color is the map view’s tint color. If a pattern color is
 specified, the result is undefined.

 Opacity may be set by specifying an alpha component. The default alpha value is
 `1.0` and results in a completely opaque shape.

 @param mapView The map view rendering the polygon annotation.
 @param annotation The annotation being rendered.
 @return The polygon’s interior fill color.

 #### Related examples
 TODO: Add a polygon annotation, learn how to modify the color of a an
 ``MLNPolygon`` at runtime.
 */
- (UIColor *)mapView:(MLNMapView *)mapView fillColorForPolygonAnnotation:(MLNPolygon *)annotation;

/**
 Returns the line width in points to use when rendering the outline of a
 polyline annotation.

 By default, the polyline is outlined with a line `3.0` points wide.

 @param mapView The map view rendering the polygon annotation.
 @param annotation The annotation being rendered.
 @return A line width for the polyline, measured in points.

 #### Related examples
 TODO: Add a line annotation from GeoJSON, learn how to modify the
 line width of an ``MLNPolylineFeature`` on your map.
 */
- (CGFloat)mapView:(MLNMapView *)mapView lineWidthForPolylineAnnotation:(MLNPolyline *)annotation;

// MARK: Managing Annotation Views

/**
 Returns a view object to mark the given point annotation object on the map.

 Implement this method to mark a point annotation with a view object. If you
 want to mark a particular point annotation with a static image instead, omit
 this method or have it return `nil` for that annotation, then implement
 `-mapView:imageForAnnotation:` instead.

 Annotation views are compatible with UIKit, Core Animation, and other Cocoa
 Touch frameworks. On the other hand, static annotation images use less memory
 and draw more quickly than annotation views.

 The user location annotation view can also be customized via this method. When
 `annotation` is an instance of ``MLNUserLocation`` (or equal to the map view’s
 `userLocation` property), return an instance of ``MLNUserLocationAnnotationView``
 (or a subclass thereof).

 @param mapView The map view that requested the annotation view.
 @param annotation The object representing the annotation that is about to be
    displayed.
 @return The view object to display for the given annotation or `nil` if you
    want to display an annotation image instead.

 #### Related examples
 TODO: Add annotation views and images, learn how to specify what
 ``MLNAnnotation`` to use for a given ``MLNAnnotation`` object on your
 map.
 */
- (nullable MLNAnnotationView *)mapView:(MLNMapView *)mapView
                      viewForAnnotation:(id<MLNAnnotation>)annotation;

/**
 Tells the delegate that one or more annotation views have been added and
 positioned on the map.

 This method is called just after the views are added to the map. You can
 implement this method to animate the addition of the annotation views.

 @param mapView The map view to which the annotation views were added.
 @param annotationViews An array of ``MLNAnnotationView`` objects representing the
    views that were added.
 */
- (void)mapView:(MLNMapView *)mapView
    didAddAnnotationViews:(NSArray<MLNAnnotationView *> *)annotationViews;

// MARK: Selecting Annotations

/**
 Returns a Boolean value indicating whether the shape annotation can be selected.

 If the return value is `YES`, the user can select the annotation by tapping
 on it. If the delegate does not implement this method, the default value is `YES`.

 @param mapView The map view that has selected the annotation.
 @param annotation The object representing the shape annotation.
 @return A Boolean value indicating whether the annotation can be selected.
 */
- (BOOL)mapView:(MLNMapView *)mapView shapeAnnotationIsEnabled:(MLNShape *)annotation;

/**
 Tells the delegate that one of its annotations was selected.

 You can use this method to track changes in the selection state of annotations.

 If the annotation is associated with an annotation view, you can also implement
 `-mapView:didSelectAnnotationView:`, which is called immediately after this
 method is called.

 @param mapView The map view containing the annotation.
 @param annotation The annotation that was selected.

 #### Related examples
 TODO: Dynamically style interactive points, learn how to remove an
 annotation view if it has already been selected.
 */
- (void)mapView:(MLNMapView *)mapView didSelectAnnotation:(id<MLNAnnotation>)annotation;

/**
 Tells the delegate that one of its annotations was deselected.

 You can use this method to track changes in the selection state of annotations.

 If the annotation is associated with an annotation view, you can also implement
 `-mapView:didDeselectAnnotationView:`, which is called immediately after this
 method is called.

 @param mapView The map view containing the annotation.
 @param annotation The annotation that was deselected.
 */
- (void)mapView:(MLNMapView *)mapView didDeselectAnnotation:(id<MLNAnnotation>)annotation;

/**
 Tells the delegate that one of its annotation views was selected.

 You can use this method to track changes in the selection state of annotation
 views.

 This method is only called for annotation views. To track changes in the
 selection state of all annotations, including those associated with static
 annotation images, implement `-mapView:didSelectAnnotation:`, which is called
 immediately before this method is called.

 @param mapView The map view containing the annotation.
 @param annotationView The annotation view that was selected.
 */
- (void)mapView:(MLNMapView *)mapView didSelectAnnotationView:(MLNAnnotationView *)annotationView;

/**
 Tells the delegate that one of its annotation views was deselected.

 You can use this method to track changes in the selection state of annotation
 views.

 This method is only called for annotation views. To track changes in the
 selection state of all annotations, including those associated with static
 annotation images, implement `-mapView:didDeselectAnnotation:`, which is called
 immediately before this method is called.

 @param mapView The map view containing the annotation.
 @param annotationView The annotation view that was deselected.
 */
- (void)mapView:(MLNMapView *)mapView didDeselectAnnotationView:(MLNAnnotationView *)annotationView;

// MARK: Managing Callout Views

/**
 Returns a Boolean value indicating whether the annotation is able to display
 extra information in a callout bubble.

 This method is called after an annotation is selected, before any callout is
 displayed for the annotation.

 If the return value is `YES`, a callout view is shown when the user taps on an
 annotation, selecting it. The default callout displays the annotation’s title
 and subtitle. You can add accessory views to either end of the callout by
 implementing the `-mapView:leftCalloutAccessoryViewForAnnotation:` and
 `-mapView:rightCalloutAccessoryViewForAnnotation:` methods. You can further
 customize the callout’s contents by implementing the
 `-mapView:calloutViewForAnnotation:` method.

 If the return value is `NO`, or if this method is absent from the delegate, or
 if the annotation lacks a title, the annotation will not show a callout even
 when selected.

 @param mapView The map view that has selected the annotation.
 @param annotation The object representing the annotation.
 @return A Boolean value indicating whether the annotation should show a
    callout.

 #### Related examples
 TODO: Add annotation views and images
 TODO: Display custom views as callouts
 TODO: Default callout usage, learn how to show callouts for
 ``MLNAnnotation`` objects.
 */
- (BOOL)mapView:(MLNMapView *)mapView annotationCanShowCallout:(id<MLNAnnotation>)annotation;

/**
 Returns a callout view to display for the given annotation.

 If this method is present in the delegate, it must return a new instance of a
 view dedicated to display the callout. The returned view will be configured by
 the map view.

 If this method is absent from the delegate, or if it returns `nil`, a standard,
 two-line, bubble-like callout view is displayed by default.

 @param mapView The map view that requested the callout view.
 @param annotation The object representing the annotation.
 @return A view conforming to the ``MLNCalloutView`` protocol, or `nil` to use the
    default callout view.

 #### Related examples
 TODO: Display custom views as callouts, learn how to customize an
 ``MLNAnnotation`` object's ``MLNAnnotation``.
 */
- (nullable id<MLNCalloutView>)mapView:(MLNMapView *)mapView
              calloutViewForAnnotation:(id<MLNAnnotation>)annotation;

/**
 Returns the view to display on the left side of the standard callout bubble.

 The left callout view is typically used to convey information about the
 annotation or to link to custom information provided by your application.

 If the view you specify is a descendant of the `UIControl` class, you can use
 the map view’s delegate to receive notifications when your control is tapped,
 by implementing the `-mapView:annotation:calloutAccessoryControlTapped:`
 method. If the view you specify does not descend from `UIControl`, your view is
 responsible for handling any touch events within its bounds.

 If this method is absent from the delegate, or if it returns `nil`, the
 standard callout view has no accessory view on its left side. The return value
 of this method is ignored if `-mapView:calloutViewForAnnotation:` is present in
 the delegate.

 To display a view on the callout’s right side, implement the
 `-mapView:rightCalloutAccessoryViewForAnnotation:` method.

 @param mapView The map view presenting the annotation callout.
 @param annotation The object representing the annotation with the callout.
 @return The accessory view to display.

 #### Related examples
 TODO: Default callout usage, learn how to modify the view that is
 displayed on the left side of the standard callout bubble.
 */
- (nullable UIView *)mapView:(MLNMapView *)mapView
    leftCalloutAccessoryViewForAnnotation:(id<MLNAnnotation>)annotation;

/**
 Returns the view to display on the right side of the standard callout bubble.

 The right callout view is typically used to convey information about the
 annotation or to link to custom information provided by your application.

 If the view you specify is a descendant of the `UIControl` class, you can use
 the map view’s delegate to receive notifications when your control is tapped,
 by implementing the `-mapView:annotation:calloutAccessoryControlTapped:`
 method. If the view you specify does not descend from `UIControl`, your view is
 responsible for handling any touch events within its bounds.

 If this method is absent from the delegate, or if it returns `nil`, the
 standard callout view has no accessory view on its right side. The return value
 of this method is ignored if `-mapView:calloutViewForAnnotation:` is present in
 the delegate.

 To display a view on the callout’s left side, implement the
 `-mapView:leftCalloutAccessoryViewForAnnotation:` method.

 @param mapView The map view presenting the annotation callout.
 @param annotation The object representing the annotation with the callout.
 @return The accessory view to display.

 #### Related examples
 TODO: Default callout usage, learn how to modify the view that is
 displayed on the right side of the standard callout bubble.
 */
- (nullable UIView *)mapView:(MLNMapView *)mapView
    rightCalloutAccessoryViewForAnnotation:(id<MLNAnnotation>)annotation;

/**
 Tells the delegate that the user tapped one of the accessory controls in the
 annotation’s callout view.

 In a standard callout view, accessory views contain custom content and are
 positioned on either side of the annotation title text. If an accessory view
 you specify is a descendant of the `UIControl` class, the map view calls this
 method as a convenience whenever the user taps your view. You can use this
 method to respond to taps and perform any actions associated with that control.
 For example, if your control displays additional information about the
 annotation, you could use this method to present a modal panel with that
 information.

 If your custom accessory views are not descendants of the `UIControl` class,
 the map view does not call this method. If the annotation has a custom callout
 view via the `-mapView:calloutViewForAnnotation:` method, you can specify the
 custom accessory views using the ``MLNCalloutView`` protocol’s
 `leftAccessoryView` and `rightAccessoryView` properties.

 @param mapView The map view containing the specified annotation.
 @param annotation The annotation whose accessory view was tapped.
 @param control The control that was tapped.

 #### Related examples
 TODO: Default callout usage, learn how to trigger an action when the
 standard callout bubble's accessory control is tapped.
 */
- (void)mapView:(MLNMapView *)mapView
                       annotation:(id<MLNAnnotation>)annotation
    calloutAccessoryControlTapped:(UIControl *)control;

/**
 Tells the delegate that the user tapped on an annotation’s callout view.

 This method is called when the user taps on the body of the callout view, as
 opposed to the callout’s left or right accessory view. If the annotation has a
 custom callout view via the `-mapView:calloutViewForAnnotation:` method, this
 method is only called whenever the callout view calls its delegate’s
 ``MLNCalloutViewDelegate/calloutViewTapped:`` method.

 If this method is present on the delegate, the standard callout view’s body
 momentarily highlights when the user taps it, whether or not this method does
 anything in response to the tap.

 @param mapView The map view containing the specified annotation.
 @param annotation The annotation whose callout was tapped.

 #### Related examples
 TODO: Display custom views as callouts, learn how to trigger an
 action when an ``MLNAnnotation``s ``MLNAnnotation`` is tapped.
 */
- (void)mapView:(MLNMapView *)mapView tapOnCalloutForAnnotation:(id<MLNAnnotation>)annotation;

@end

NS_ASSUME_NONNULL_END