WIP new UI elem

src/net/torvald/terrarum/QNDTreeNode.kt

@@ -0,0 +1,28 @@
+package net.torvald.terrarum
+
+import java.util.ArrayList
+
+class QNDTreeNode<T>(var data: T? = null, var parent: QNDTreeNode<T>? = null) {
+    var children = ArrayList<QNDTreeNode<T>>()
+
+
+    private fun traverse1(node: QNDTreeNode<T>, action: (QNDTreeNode<T>, Int) -> Unit, depth: Int = 0) {
+        //if (node == null) return
+        action(node, depth)
+        node.children.forEach { traverse1(it, action, depth + 1) }
+    }
+
+    private fun traverse2(node: QNDTreeNode<T>, action: (QNDTreeNode<T>, Int) -> Unit, depth: Int = 0) {
+        //if (node == null) return
+        node.children.forEach { traverse2(it, action, depth + 1) }
+        action(node, depth)
+    }
+
+    fun traversePreorder(action: (QNDTreeNode<T>, Int) -> Unit) {
+        this.traverse1(this, action)
+    }
+
+    fun traversePostorder(action: (QNDTreeNode<T>, Int) -> Unit) {
+        this.traverse2(this, action)
+    }
+}