Tornadofx: EventBus not work with child view

[orochies]

when I define a subscription in a daughter view the subscription is not released.

object MyEvent : FXEvent()

class MainView : View("")

override val root = VBox () {
this += ChildView()
}

}

class ChildView : View("") {
init {
subscribe<MyEvent > {
// this not work, not fire after invoke fire() method from MainView
}
}

Thanks

[edvin]

This happens because you manually instantiate the ChildView. You must never instantiate a UI Component manually as it prevents it from taking part in important life cycle events. Either use inject, find, or add. Simply changing this += ChildView() to add<ChildView>() resolves the issue.

There are a number of other issues with your code, here is a cleaned up sample with best practices.

object MyEvent : FXEvent()

class MainView : View() {
    override val root = vbox {
        add<ChildView>()
        button("Fire").action { fire(MyEvent) }
    }

}

class ChildView : View() {
    override val root = label("Waiting...") {
        subscribe<MyEvent> {
            text = "Event was fired at ${LocalDateTime.now()}"
        }
    }
}

[orochies]

Thanks, that work for me, but how send params to ChildView?

I need pass viewmodel to ChildView and currently do it by constructor.

[gtnarg]

Read up on Scopes in the documentation. They allow you to do just this without requiring parameter passing.

[edvin]

Thanks Grant :) The other alternative is to change ChildView to a Fragment and pass parameters to find. Also well documented in the guide :)