[gui] add TailLayout rowSize

src/main/haxework/gui/layout/TailLayout.hx

@@ -8,6 +8,8 @@ typedef Row = {
 
 class TailLayout extends DefaultLayout {
 
+    public var rowSize:Int = 0;
+
     // ToDo: check group.layoutAlign
     private function placeRow(group:IGroupView, y:Float, row:Row):Void {
         var x:Float = (group.width - row.width) / 2;
@@ -28,7 +30,10 @@ class TailLayout extends DefaultLayout {
         for (view in views) {
             setViewWidth(group, view);
             setViewHeight(group, view);
-            if (row.width + view.width + margin + group.geometry.margin.horizontal > group.width) {
+            if (
+            (rowSize > 0 && row.views.length >= rowSize) ||
+            (row.width + view.width + margin + group.geometry.margin.horizontal > group.width)
+            ) {
                 rows.push(row);
                 row = {
                     width: 0,