setStack() and removeStack() doesnt really work...

[Jasper6671]

I have made a GUI with LibGui which has 2 Item Slots(1 Input, 2 Output). It halso has a button and when i click it it should remove the input item and add a Item to the Output Slot but its doesnt really do it. It shows that the Input Item is not in the slot anymore and it also shows The Output Item correctly until i click somewhere in the inventory . Then it resets the inventory so that the output item disappears and the input item again in the input slot.

Hope someone can help me with that :)
Code(GuiDesc): https://pastebin.com/Z1ZQKQZK
Video:

Uploading 2024-11-14 21-38-45.mp4…

[Juuxel]

You can't really modify inventory contents from the logical client (this includes setStack), as the logical server fully controls and manages inventories.

Instead, you need to send a packet or a LibGui screen message from the client (button.setOnClick(() -> { /* from here */ })) to the server telling it that the button has been pressed. The server can then modify the block inventory.

Also: avoid doing file IO like deleteIfExists directly on the render thread in button click listeners etc, it can freeze the screen which is frustrating for players.