此类提供有关已触发显示下拉菜单的事件的信息。
| localMousePosition | 如果触发事件是鼠标事件，则此属性是鼠标位置。该位置使用接收鼠标事件的元素的坐标系表示。否则此属性为零。 |
| modifiers | 如果已按下修改键（Alt、Ctrl、Shift、Windows/Command）以触发下拉菜单显示，则此属性将列出修改键。 |
| mousePosition | 如果触发事件是鼠标事件，则此属性是使用全局坐标系表示的鼠标位置。否则此属性为零。 |
| DropdownMenuEventInfo | 构造函数。 |
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