Item Gallery

charms.json

{
  "name": "Charms",
  "icon": "twilightforest:charm_of_keeping_3",
  "category": "treasures",
  "pages": [
    {
      "type": "twilightforest:gallery",
      "item_list": "twilightforest:charm_of_keeping_1|twilightforest:charm_of_keeping_2|twilightforest:charm_of_keeping_3"
    }
  ]
}

gallery.json

{
  "components": [
    {
      "type": "custom",
      "class": "twilightforest.compat.patchouli.GalleryComponent",
      "table_x": 6,
      "items": "#item_list"
    }
  ]
}

GalleryComponent.java

package twilightforest.compat.patchouli;

import com.google.gson.annotations.SerializedName;
import net.minecraft.client.Minecraft;
import net.minecraft.item.ItemStack;
import twilightforest.TwilightForestMod;
import vazkii.patchouli.api.ICustomComponent;
import vazkii.patchouli.api.VariableHolder;
import vazkii.patchouli.common.util.ItemStackUtil;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@SuppressWarnings("unused")
public class GalleryComponent implements ICustomComponent {
    int x, y;
    @SuppressWarnings("WeakerAccess")
    @SerializedName("table_x")
    int xCount = 6;

    @SuppressWarnings("WeakerAccess")
    @VariableHolder
    String items;

    private transient List<ItemStack> stacks;
    private static final transient Minecraft mc = Minecraft.getMinecraft();

    @Override
    public void build(int x, int y, int pageNum) {
        TwilightForestMod.LOGGER.info(xCount);
        TwilightForestMod.LOGGER.info(items);

        stacks = Arrays.stream(items.split("\\|")).map(ItemStackUtil::loadStackFromString).filter(i -> !i.isEmpty()).collect(Collectors.toList());

        if (xCount <= 0 || xCount > 6)
            xCount = Math.min(stacks.size(), 6);
    }

    @Override
    public void render(float partialTicks) {
        int listSize = stacks.size();

        for (int c = 0; c < listSize; c++)
            mc.getRenderItem().renderItemAndEffectIntoGUI(stacks.get(c), Math.floorMod(c, xCount), c / xCount);

        mc.fontRenderer.drawString(items, 0, 0, 0xFFAADD);
    }
}