有关刚刚开始的拖放操作的信息。您可以使用它来存储拖放过程中其余部分的通用数据。请参阅 BaseVerticalCollectionView.setupDragAndDrop。
| draggedElement | 拖放操作开始的元素。 |
| selectedIds | 源中的选中 ID。 |
| startDragArgs | 提供初始化新拖放操作的数据和视觉效果的入口点。 |
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