GuiComponentCraftingGrid.java

package openmods.gui.component;

import com.google.common.base.Function;
import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import javax.annotation.Nullable;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.item.ItemStack;
import net.minecraft.util.EnumChatFormatting;
import net.minecraft.util.IIcon;
import net.minecraft.util.ResourceLocation;
import openmods.utils.CollectionUtils;
import org.lwjgl.opengl.GL11;

public class GuiComponentCraftingGrid extends GuiComponentSprite {

	private static final int UPDATE_DELAY = 20;

	private static final Random rnd = new Random();

	private static final Function<ItemStack, ItemStack[]> EXPAND_TRANSFORM = new Function<ItemStack, ItemStack[]>() {
		@Override
		@Nullable
		public ItemStack[] apply(@Nullable ItemStack input) {
			return input != null? new ItemStack[] { input.copy() } : null;
		}
	};

	private final ItemStack[][] items;

	private final ItemStack[] selectedItems;

	private int changeCountdown = UPDATE_DELAY;

	public GuiComponentCraftingGrid(int x, int y, ItemStack[] items, IIcon background, ResourceLocation backgroundTexture) {
		this(x, y, CollectionUtils.transform(items, EXPAND_TRANSFORM), background, backgroundTexture);
	}

	public GuiComponentCraftingGrid(int x, int y, ItemStack[][] items, IIcon icon, ResourceLocation texture) {
		super(x, y, icon, texture);
		Preconditions.checkNotNull(items, "No items in grid");
		this.items = items;
		this.selectedItems = new ItemStack[items.length];

		selectItems();
	}

	@Override
	public boolean isTicking() {
		return true;
	}

	@Override
	public void tick() {
		if (changeCountdown-- <= 0) {
			selectItems();
			changeCountdown = UPDATE_DELAY;
		}
	}

	@Override
	public void render(Minecraft minecraft, int offsetX, int offsetY, int mouseX, int mouseY) {
		super.render(minecraft, offsetX, offsetY, mouseX, mouseY);

		final int gridOffsetX = 1;
		final int gridOffsetY = 1;
		final int itemBoxSize = 19;

		for (int i = 0; i < items.length; i++) {
			ItemStack input = selectedItems[i];
			if (input != null) {
				int row = (i % 3);
				int column = i / 3;
				int itemX = offsetX + gridOffsetX + (row * itemBoxSize);
				int itemY = offsetY + gridOffsetY + (column * itemBoxSize);
				drawItemStack(input, x + itemX, y + itemY, "");
			}
		}
	}

	private void selectItems() {
		for (int i = 0; i < items.length; i++) {
			ItemStack[] slotItems = items[i];
			if (slotItems.length == 0) selectedItems[i] = null;
			else {
				final int choice = rnd.nextInt(slotItems.length);
				selectedItems[i] = slotItems[choice];
			}
		}
	}

	@Override
	public void renderOverlay(Minecraft minecraft, int offsetX, int offsetY, int mouseX, int mouseY) {
		super.renderOverlay(minecraft, offsetX, offsetY, mouseX, mouseY);

		final int relativeMouseX = mouseX + offsetX - x;
		final int relativeMouseY = mouseY + offsetY - y;

		final int gridOffsetX = 1;
		final int gridOffsetY = 1;
		final int itemBoxSize = 19;

		if (isMouseOver(mouseX, mouseY)) {
			ItemStack tooltip = null;
			// so lazy
			for (int i = 0; i < selectedItems.length; i++) {
				int row = (i % 3);
				int column = i / 3;
				int itemX = offsetX + gridOffsetX + (row * itemBoxSize);
				int itemY = offsetY + gridOffsetY + (column * itemBoxSize);
				if (relativeMouseX > itemX - 2 && relativeMouseX < itemX - 2 + itemBoxSize &&
						relativeMouseY > itemY - 2 && relativeMouseY < itemY - 2 + itemBoxSize) {
					tooltip = selectedItems[i];
					break;
				}
			}

			if (tooltip != null) {
				drawItemStackTooltip(tooltip, relativeMouseX + 25, relativeMouseY + 30);
			}
		}
	}

	protected void drawItemStackTooltip(ItemStack stack, int x, int y) {
		final Minecraft mc = Minecraft.getMinecraft();
		FontRenderer font = Objects.firstNonNull(stack.getItem().getFontRenderer(stack), mc.fontRenderer);

		GL11.glColor3f(1, 1, 1);
		GL11.glDisable(GL11.GL_LIGHTING);
		@SuppressWarnings("unchecked")
		List<String> list = stack.getTooltip(mc.thePlayer, mc.gameSettings.advancedItemTooltips);

		List<String> colored = Lists.newArrayListWithCapacity(list.size());
		Iterator<String> it = list.iterator();
		colored.add(getRarityColor(stack) + it.next());

		while (it.hasNext())
			colored.add(EnumChatFormatting.GRAY + it.next());

		drawHoveringText(colored, x, y, font);
	}

	private static EnumChatFormatting getRarityColor(ItemStack stack) {
		return stack.getRarity().rarityColor;
	}

}