Notify javafx that contents has changed - scala

Question

Here's a simple class, which I'm holding in a javafx ListView
class MyItem {
var active: Boolean = true
def toString = "Test"
}
I've made a custom listcell for MyItem
class MyCell extends ListCell[MyItem] {
override def updateItem(item: MyItem, empty: Boolean): Unit = {
super.updateItem(item, empty)
if(item != null) {
setText(item.toString)
if(item.active) setGraphic(g1) else setGraphic(g2)
}
}
}
I've set this on a listview, but I would like the graphic to change along with the active var. If this were swing, I'd just call repaint when I change it, but this isn't an option.
Is there some way of notifying javafx of the change? Should I be structuring things differently?

Answer 1

Try making var active as BooleanProperty and add a ChangeListener on active. If this is on Java,
Modify model
class MyItem {
private BooleanProperty active;
public MyItem() {
active = new SimpleBooleanProperty();
}
public BooleanProperty activeProperty() {
return active;
}
public void setActive(boolean active) {
this.active.set(active);
}
public boolean isActive() {
return active.get();
}
}
Modify update method:
super.updateItem(item, empty);
if (item != null) {
setText(item.toString());
item.activeProperty().addListener((observable, oldValue, newValue) -> {
if (newValue) setGraphic(g1);
else setGraphic(g2);
});
}