refactor(xydrag): cleanup

packages/system/src/types/nodes.ts

@@ -120,8 +120,8 @@ export type NodeDragItem = {
   // distance from the mouse cursor to the node when start dragging
   distance: XYPosition;
   measured: {
-    width?: number;
-    height?: number;
+    width: number;
+    height: number;
   };
   internals: {
     positionAbsolute: XYPosition;

packages/system/src/xydrag/XYDrag.ts

@@ -144,10 +144,10 @@ export function XYDrag<OnNodeDrag extends (e: any, nodes: any, node: any) => voi
         if (dragItems.size > 1 && nodeExtent && !dragItem.extent) {
           const { positionAbsolute } = dragItem.internals;
           const x1 = positionAbsolute.x - nodesBox.x + nodeExtent[0][0];
-          const x2 = positionAbsolute.x + (dragItem.measured?.width ?? 0) - nodesBox.x2 + nodeExtent[1][0];
+          const x2 = positionAbsolute.x + dragItem.measured.width - nodesBox.x2 + nodeExtent[1][0];
 
           const y1 = positionAbsolute.y - nodesBox.y + nodeExtent[0][1];
-          const y2 = positionAbsolute.y + (dragItem.measured?.height ?? 0) - nodesBox.y2 + nodeExtent[1][1];
+          const y2 = positionAbsolute.y + dragItem.measured.height - nodesBox.y2 + nodeExtent[1][1];
 
           adjustedNodeExtent = [
             [x1, y1],

packages/system/src/xydrag/utils.ts

@@ -63,8 +63,8 @@ export function getDragItems<NodeType extends NodeBase>(
             positionAbsolute: internalNode.internals.positionAbsolute || { x: 0, y: 0 },
           },
           measured: {
-            width: internalNode.measured.width || 0,
-            height: internalNode.measured.height || 0,
+            width: internalNode.measured.width ?? 0,
+            height: internalNode.measured.height ?? 0,
           },
         });
       }