Can someone please provide an callback example

yahwho · May 3rd 2023

Hi, so on my old server I wrote the entire plugin UI using things such as onPlayerGuiElementClickEvent

I see now that we have some really useful pre-canned message boxes such as;

Java

 player.showMessageBox(MessageBoxButtons.Yes_No_Cancel, "Title", "Question", 0, null);

(I've dropped a null in the callback ... )

Can someone please provide a simple example of a callback function (I understand the concept, just not the syntax).

Ideally showing how we get this callback function to call another method passing the MessageBox arguments?

Thanks in advance!

paulevs · May 3rd 2023

Hi, this can be a simple lambda:

Java

event.getPlayer().showMessageBox(MessageBoxButtons.Yes_No_Cancel, "Title", "Question", 0, button -> {
    switch (button) {
        case 0 -> event.getPlayer().sendTextMessage("YES!");
        case 1 -> event.getPlayer().sendTextMessage("NO!");
        case 2 -> event.getPlayer().sendTextMessage("CANCEL! (Or just timeout)");
    }
});

paulevs · May 3rd 2023

Or if your player is stored in field you can use a method:

Java

player.showMessageBox(MessageBoxButtons.Yes_No_Cancel, "Title", "Question", 0, this::processMenuButton);

Java

private void processMenuButton(int button) {
    switch (button) {
        case 0 -> player.sendTextMessage("YES!");
        case 1 -> player.sendTextMessage("NO!");
        case 2 -> player.sendTextMessage("CANCEL! (Or just timeout)");
    }
}

yahwho · May 3rd 2023

Thanks paulevs much appreciated.

Simple and clear 👌

Participate now!