Created
September 24, 2015 08:31
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MvvmCross SubscriptionManager
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public class SubscriptionManager | |
{ | |
private Dictionary<Type, MvxSubscriptionToken> subscriptions = new Dictionary<Type, MvxSubscriptionToken>(); | |
public IMvxMessenger Messenger { get; set; } | |
public SubscriptionManager(IMvxMessenger messenger) | |
{ | |
Messenger = messenger; | |
} | |
public void SubscribeToMessage<T>(Action<T> action) where T : MvxMessage | |
{ | |
Unsubscribe<T>(); | |
subscriptions[typeof (T)] = Messenger.SubscribeOnMainThread(action); | |
} | |
/// <summary> | |
/// Subscribes to a message and automatically unsubscribes after the first message is received. | |
/// </summary> | |
public void SubscribeToSingleMessage<T>(Action<T> action) where T : MvxMessage | |
{ | |
SubscribeToMessage<T>(t => { | |
Unsubscribe<T>(); | |
action(t); | |
}); | |
} | |
private void Unsubscribe<T>() where T : MvxMessage | |
{ | |
var type = typeof (T); | |
MvxSubscriptionToken value; | |
if (subscriptions.TryGetValue(type, out value)) | |
Messenger.Unsubscribe<T>(value); | |
} | |
public void UnsubscribeAll() | |
{ | |
var unsubscribeMethod = typeof (IMvxMessenger).GetRuntimeMethod("Unsubscribe", | |
new[] { typeof (MvxSubscriptionToken) }); | |
foreach (var pair in subscriptions) { | |
var genericMethod = unsubscribeMethod.MakeGenericMethod(pair.Key); | |
genericMethod.Invoke(Messenger, new object[] { pair.Value }); | |
} | |
subscriptions = new Dictionary<Type, MvxSubscriptionToken>(); | |
Messenger.RequestPurgeAll(); | |
} | |
} |
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