Inventory implementation

scripts/Utils.ts

@@ -24,4 +24,27 @@ export function canUseWebP(): boolean {
         // In very old browsers (IE 8) canvas is not supported
         return false
     }
+}
+
+export function swapElements(a: Node, b: Node) {
+	let parent = b.parentNode
+	let bNext = b.nextSibling
+
+	// Special case for when a is the next sibling of b
+	if(bNext === a) {
+		// Just put a before b
+		parent.insertBefore(a, b)
+	} else {
+		// Insert b right before a
+		a.parentNode.insertBefore(b, a)
+
+		// Now insert a where b was
+		if(bNext) {
+			// If there was an element after b, then insert a right before that
+			parent.insertBefore(a, bNext)
+		} else {
+			// Otherwise just append it as the last child
+			parent.appendChild(a)
+		}
+	}
 }