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//
// SDLSubscribeButtonObserver.h
// SmartDeviceLink
//
// Created by Nicole on 5/21/20.
// Copyright © 2020 smartdevicelink. All rights reserved.
//
#import "SDLNotificationConstants.h"
NS_ASSUME_NONNULL_BEGIN
/// A handler mirroring the one in SDLSubscribeButtonManager.h for `subscribeButton:withBlock:`
typedef void (^SDLSubscribeButtonUpdateHandler)(SDLOnButtonPress *_Nullable buttonPress, SDLOnButtonEvent *_Nullable buttonEvent, NSError *_Nullable error);
/// An observer object for SDLSubscribeButtonManager
@interface SDLSubscribeButtonObserver : NSObject
/// The object that will be used to call the selector if available, and to unsubscribe this observer
@property (weak, nonatomic) id<NSObject> observer;
/// A selector called when the observer is triggered
@property (assign, nonatomic) SEL selector;
/// A block called when the observer is triggered
@property (copy, nonatomic) SDLSubscribeButtonUpdateHandler updateBlock;
/// Create an observer using an object and a selector on that object
/// @param observer The object to be called when the subscription triggers
/// @param selector The selector to be called when the subscription triggers
/// @return The observer
- (instancetype)initWithObserver:(id<NSObject>)observer selector:(SEL)selector;
/// Create an observer using an object and a callback block
/// @param observer The object that can be used to unsubscribe the block
/// @param block The block that will be called when the subscription triggers
/// @return The observer
- (instancetype)initWithObserver:(id<NSObject>)observer updateHandler:(SDLSubscribeButtonUpdateHandler)block;
@end
NS_ASSUME_NONNULL_END
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