Class EventTriggerBase<T>

Represents a trigger that can listen to an element other than its AssociatedObject.

Inheritance
System.Object
DependencyObject
TriggerBase
EventTriggerBase
EventTriggerBase<T>
KeyTrigger
EventTrigger
Implements
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: System.Windows.Interactivity
Assembly: OpenSilver.Interactivity.dll
Syntax
public abstract class EventTriggerBase<T> : EventTriggerBase, IAttachedObject where T : class
Type Parameters
Name Description
T

The type that this trigger can be associated with.
Remarks

EventTriggerBase extends TriggerBase to add knowledge of another object than the one it is attached to. This allows a user to attach a Trigger/Action pair to one element and invoke the Action in response to a change in another object somewhere else. Override OnSourceChanged to hook or unhook handlers on the source element, and OnAttached/OnDetaching for the associated element. The type of the Source element can be constrained by the generic type parameter. If you need control over the type of the AssociatedObject, set a TypeConstraintAttribute on your derived type.

Constructors

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EventTriggerBase()

Initializes a new instance of the EventTriggerBase<T> class.

Declaration
protected EventTriggerBase()

Properties

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Source

Gets the resolved source. If is not set or cannot be resolved, defaults to AssociatedObject.

Declaration
public T Source { get; }
Property Value
Type Description
T

The resolved source object.
Remarks

In general, this property should be used in place of AssociatedObject in derived classes.

Methods

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OnSourceChanged(T, T)

Called when the source property changes.

Declaration
protected virtual void OnSourceChanged(T oldSource, T newSource)
Parameters
Type Name Description
T oldSource

The old source.
T newSource

The new source.
Remarks

Override this to hook functionality to and unhook functionality from the specified source, rather than the AssociatedObject.

Implements

Extension Methods