Add ghost item icons

Closes #228.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/main/java/io/github/cottonmc/cotton/gui/widget/icon/ItemIcon.java b/src/main/java/io/github/cottonmc/cotton/gui/widget/icon/ItemIcon.java
index 9da86ee..e6beeed 100644
--- a/src/main/java/io/github/cottonmc/cotton/gui/widget/icon/ItemIcon.java
+++ b/src/main/java/io/github/cottonmc/cotton/gui/widget/icon/ItemIcon.java
@@ -3,6 +3,7 @@ package io.github.cottonmc.cotton.gui.widget.icon;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.gui.DrawContext;
+import net.minecraft.client.render.RenderLayer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
@@ -15,7 +16,11 @@ import java.util.Objects;
  * @since 2.2.0
  */
 public class ItemIcon implements Icon {
+	// Matches the vanilla RecipeBookGhostSlots class (1.20.2).
+	private static final int GHOST_OVERLAY_COLOR = 0x30_FFFFFF;
+
 	private final ItemStack stack;
+	private boolean ghost = false;
 
 	/**
 	 * Constructs an item icon.
@@ -47,6 +52,34 @@ public class ItemIcon implements Icon {
 		matrices.translate(x, y, 0);
 		matrices.scale(scale, scale, 1);
 		context.drawItemWithoutEntity(stack, 0, 0);
+
+		if (isGhost()) {
+			context.fill(RenderLayer.getGuiGhostRecipeOverlay(), 0, 0, 16, 16, GHOST_OVERLAY_COLOR);
+		}
+
 		matrices.pop();
 	}
+
+	/**
+	 * Checks whether this icon is a ghost item.
+	 * Ghost items are rendered with a pale overlay.
+	 *
+	 * @return {@code true} if this icon is a ghost item, {@code false} otherwise
+	 * @since 9.2.0
+	 */
+	public boolean isGhost() {
+		return ghost;
+	}
+
+	/**
+	 * Marks this icon as a ghost or non-ghost icon.
+	 *
+	 * @param ghost {@code true} if this icon is a ghost item, {@code false} otherwise
+	 * @return this icon
+	 * @since 9.2.0
+	 */
+	public ItemIcon setGhost(boolean ghost) {
+		this.ghost = ghost;
+		return this;
+	}
 }