1.19 How to access BlockEntity data from ContainerScreen

[Zacomat]

Hi all!

I want to show some data from my BlockEntity in the method renderTooltip of my screen that implements AbstractContainerScreen.

But i dont know how to get a reference to the BlockEntity of the block clicched to open the screen.

Any suggestions?

Thx

[warjort]

See "synchronizing data to the client" here: https://forge.gemwire.uk/wiki/Block_Entities

or https://forums.minecraftforge.net/topic/115679-1182-block-entity-renderer-disappears-after-leaving-the-world/#comment-511734

[Zacomat]

First of all thanks for the quick reply!

The problem is that I want to show in the renderTooltip of my screen some data that is already synchronized in my client side blockentity.

The method is AbstractContainerScreen.renderTooltip(PoseStack pose, int mousex, int mousey)

@Override
	protected void renderTooltip(PoseStack pose, int mousex, int mousey) {
		if (menu.getCarried().isEmpty() && hoveredSlot != null && hoveredSlot.hasItem()) {
			this.renderTooltip(pose, hoveredSlot.getItem(), mousex, mousey);
		} else if (mousex > leftPos + 94 && mousex < leftPos + 94 + 17 && mousey > topPos + 51 - 17 && mousey < topPos + 51) {
                                                                                                                      
			List<Component> lines = new ArrayList<Component>();

			MyBlockEntity mbe = null;//I dont know how to get a reference to my block entity
			CompoundTag tag = new CompoundTag();
			mbe.saveAdditional(tag);

			lines.add(Component.literal("tag=" + tag));
			lines.add(Component.literal("pos=" + mbe.getBlockPos()));
			lines.add(Component.literal("line 3"));
			lines.add(Component.literal("line 4"));
			lines.add(Component.literal("line 5"));

			this.renderComponentTooltip(pose, lines, mousex, mousey);
		}
	}

 

[warjort]

Ah ok. I saw you say rendering and thought this was the usual FAQ. 🙂 

 

Look at forge's NetworkHooks.openScreen() and IContainerFactory extension to the vanilla MenuSupplier that lets you pass additional data to the client.

 

You can see an example of immersive engineering using openScreen() here to pass the BlockEntity's BlockPos

https://github.com/BluSunrize/ImmersiveEngineering/blob/4bd8d08d6362a19ed51372b6a3933b6a15853a14/src/main/java/blusunrize/immersiveengineering/common/blocks/IEEntityBlock.java#L303

and retrieving the BlockEntity on the client from the BlockPos by registering the MenuType using the IContainerFactory that gets the additional data

https://github.com/BluSunrize/ImmersiveEngineering/blob/4bd8d08d6362a19ed51372b6a3933b6a15853a14/src/main/java/blusunrize/immersiveengineering/common/register/IEMenuTypes.java#L137

Obviously you can just use Minecraft.getInstance().level but you should also check level.isLoaded(BlockPos) if you want to avoid potential crashes. 

Edited October 14, 2022 by warjort

[Zacomat]

Thank you very much !