Layout improvements

core/src/mindustry/ui/layout/RowTreeLayout.java

@@ -0,0 +1,36 @@
+package mindustry.ui.layout;
+
+import arc.struct.*;
+
+public class RowTreeLayout implements TreeLayout{
+
+    @Override
+    public void layout(TreeNode root){
+       layout(root, 0, new IntArray());
+
+        /*
+        def minimum_ws(tree, depth=0):
+    tree.x = nexts[depth]
+    tree.y = depth
+    nexts[depth] += 1
+    for c in tree.children:
+        minimum_ws(tree, c)
+         */
+    }
+
+    void layout(TreeNode node, int depth, IntArray nexts){
+        float size = node.height * 5f;
+
+        if(nexts.size < depth + 1){
+            nexts.ensureCapacity(depth + 1);
+            nexts.size = depth + 1;
+        }
+
+        node.x = size * nexts.get(depth);
+        node.y = size * depth;
+        nexts.incr(depth, 1);
+        for(TreeNode child : node.children){
+            layout(child, depth + 1, nexts);
+        }
+    }
+}