griffon.transform

Annotation Type ListChangeListener

@Retention(value=SOURCE)
 @Target(value=FIELD)
public @interface ListChangeListener

Annotates a property.

This transformation provides a convenient way to register ListChangeListeners on an ObservableList by leveraging Groovy's closures and the Groovy cast operator.

The following code exemplifies what must be written by hand in order to register a ChangeListener.

 import griffon.transform.ListChangeListener
 import griffon.transform.FXObservable
 import javafx.collections.FXCollections
 import javafx.collections.ObservableList
 import griffon.core.artifact.GriffonModel

 @griffon.metadata.ArtifactProviderFor(GriffonModel)
 class SampleModel {
     def controller

     @FXObservable
     @ListChangeListener(snoop)
     ObservableList list = FXCollections.observableArrayList()

     def snoop = { change -> ... }
 }
 

Applying @ChangeListener to the previous snippet results in the following code

 import javafx.collections.ListChangeListener
 import javafx.collections.FXCollections
 import javafx.collections.ObservableList
 import griffon.core.artifact.GriffonModel

 @griffon.metadata.ArtifactProviderFor(GriffonModel)
 class SampleModel {
    def controller

     @FXObservable ObservableList list = FXCollections.observableArrayList()

     def snoop = { change -> ... }

     SampleModel() {
         listProperty().addListener(snoopAll as ListChangeListener)
     }
 }
 

Any closures found as the annotation's value will be either transformed into inner classes that implement ListChangeListener (when the value is a closure defined in place) or be casted as a proxy of ListChangeListener (when the value is a property reference found in the same class).

List of closures are also supported.

Since:

2.4.0

Author:

Andres Almiray

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
String	value

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	weak If the ListChangeListener should be wrapped with a WeakListChangeListener or not

Element Detail

value

public abstract String value

weak

public abstract boolean weak

If the ListChangeListener should be wrapped with a WeakListChangeListener or not

Default:

false