javascript - Kotlin JavaScript removeEventListener本身(Kotlin JavaScript removeEventListener from itself)

Question

I'm stuck on a simple drag-and-drop functionality using Kotlin JS.

(我只能使用Kotlin JS进行简单的拖放功能。)

I add a handleDrag event listener and then I want to remove it in handleMouseUp listener.

(我添加了handleDrag事件侦听器，然后在handleMouseUp侦听器handleMouseUp其删除。)

That works perfectly.

(那很好。)

The thing is that handleMouseUp also needs to remove itself.

(问题是handleMouseUp也需要删除自身。)

It's quite straightforward in JS but not so much in Kotlin apparently.

(在JS中，这非常简单，但在Kotlin中却没有那么多。)

val handleMouseUp = fun(evt: Event) {
    evt as MouseEvent
    GUI.removeListener("mousemove", handleDrag)
    GUI.removeListener("mouseup", handleMouseUp) //unresolved reference: handleMouseUp
}
GUI.addListener("mousemove", handleDrag)

I also tried named functions;

(我还尝试了命名函数；)

that compiles but doesn't remove the listener for some reason (probably two references like ::handleMouseUp aren't the same object).

(可以编译，但由于某种原因不会删除侦听器（可能像::handleMouseUp这样的两个引用不是同一对象）。)

Is there any way to do this the way I intended at the beginning?

(有什么方法可以按照我一开始的意图进行？)

If not I accept tips how to work around it.

(如果没有，我接受如何解决的提示。)

Maybe I'm missing something because I'm not experienced in event-driven and JS programming.

(也许我错过了一些东西，因为我没有事件驱动和JS编程方面的经验。)

removeListener and addListener are just wrappers

(removeListener和addListener只是包装器)

fun addListener(type: String, listener: (Event) -> Unit) {
    canvas.canvas.addEventListener(type, listener)
}
fun removeListener(type: String, listener: (Event) -> Unit) {
    canvas.canvas.removeEventListener(type, listener)
}

  ask by Adam Stafiej translate from so

Answer 1

等待大神答复