griffon.transform

Annotation Type MapChangeListener

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

Annotates a property.

This transformation provides a convenient way to register MapChangeListeners on an ObservableMap 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.MapChangeListener
 import griffon.transform.FXObservable
 import javafx.collections.FXCollections
 import javafx.collections.ObservableMap
 import griffon.core.artifact.GriffonModel

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

     @FXObservable
     @MapChangeListener(snoop)
     ObservableMap map = FXCollections.observableHashMap()

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

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

 import javafx.collections.MapChangeListener
 import javafx.collections.FXCollections
 import javafx.collections.ObservableMap
 import griffon.core.artifact.GriffonModel

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

     @FXObservable ObservableMap map = FXCollections.observableHashMap()

     def snoop = { change -> ... }

     SampleModel() {
         mapProperty().addListener(snoopAll as MapChangeListener)
     }
 }
 

Any closures found as the annotation's value will be either transformed into inner classes that implement MapChangeListener (when the value is a closure defined in place) or be casted as a proxy of MapChangeListener (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
java.lang.String	value

Optional Element Summary

Optional Elements

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

Element Detail

value

public abstract java.lang.String value

weak

public abstract boolean weak

If the MapChangeListener should be wrapped with a WeakMapChangeListener or not

Default:

false