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Using @ContextValue with JavaFX Properties [message #1387148] Tue, 24 June 2014 08:45 Go to next message
Eclipse UserFriend
Hi

I'm am playing with @ContextValue following the recipe here:
https://wiki.eclipse.org/Efxclipse/Runtime/Recipes#Injected_value_as_an_observable

My goal is to have a property in the application or perspective scope to keep track of a currently selected element. In simplest terms: There is a master part where you can select a HistoryEvent and a detail part where the properties of the selected element should be displayed.

The setup of the master part looks like this:

@PostConstruct
void postContruct(BorderPane parent, @ContextValue("selection.HistoryEvent") Property<HistoryEvent> selectedEvent) {
	TableView<HistoryEvent> table = createTableView();
	controlsPane.setCenter(parent);
	
	selectedEvent.bind(table.getSelectionModel().selectedItemProperty());
}

This gives me an exception during creation:
Caused by: java.lang.RuntimeException: A bound value cannot be set.
	at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:141)
	at org.eclipse.fx.core.di.context.internal.PropertyAdapterProvider$2.call(PropertyAdapterProvider.java:60)
	at org.eclipse.fx.core.di.context.internal.EclipseContextBoundValue.setCurrentValue(EclipseContextBoundValue.java:87)
	...
so it seams, as if the newly created Property selectedEvent has already been bound somewhere.

Am I using this wrong? Should it be:
table.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
	selectedEvent.setValue(newValue);
});

Or should I create the Property in an AddOn and put it in the context myself?

Greetings
Christoph
Re: Using @ContextValue with JavaFX Properties [message #1391037 is a reply to message #1387148] Mon, 30 June 2014 07:04 Go to previous message
Eclipse UserFriend
I debugged the issue today. The problem is that the Property created with the PropertyAdapter will be set, when the value changes in the context. This is called right away when the binding is set up. I'm not sure, but it seems like this could be an unnecessary round trip.

Value of Property is set => ContextBoundValue.publish => ContextBoundValue OnValueChange => Property.set()

I created a bug to find a solution for this:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=438541
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