When I run this minimized example code and click t...

# tornadofx

[Douglas KN]

When I run this minimized example code and click the button I get java.lang.RuntimeException: A bound value cannot be set. because x2p in ThingModel is two-way bound. Is there any way to change the val x2p = bind(Thing::x2Property) call to be just a one-way binding? I'm only using it for display purposes -- there's nothing that needs to be written back.

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[albrechtroehm]

Maybe i dont get all the points but why dont you just use x directly in the view when its only for displaying the value x 2 ... Like override val root = vbox { label(stringBinding(thing1.x){value *2})}

[albrechtroehm]

Or you could try something like this which worked for me
//Model
val travelCosts: NumberBinding = Bindings.multiply(travelDistanceProperty, costsPerKilometerProperty)
//ItemViewModel
val travelCost = bind(Model::travelCosts)

[Douglas KN]

This is simplified version of the code. The real code is doing more complex property manipulation and there's kind of a long binding chain leading to the last property -- that's why it can't be x directly in the view.

[Douglas KN]

I think the problem with an integerBinding (or other binding) is that they appear to be lazily evaluated? With the code commented out on lines 9-15, I think there's nothing to force the x2 binding to evaluate. In the gui I see IntegerBinding [invalid] for the label. And then, with that code uncommented I see IntegerBinding 2 which looks kind of weird. And I don't see the value in thing1 changing after the model commits.

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