interface in UnityEngine.Experimental.UIElements
切换到手册鼠标事件接口。
| actionKey | 如果按下了特定于平台的操作键，则返回 true。此键是 macOS 上的 Command 键，其他平台上是 Control 键。 |
| altKey | 如果按下 Alt 键，则返回 true。 |
| button | 表示按下的鼠标按钮的整数。0 为左侧，1 为右侧，2 为中间。 |
| clickCount | 单击次数。 |
| commandKey | 如果按下 Windows/Command 键，则返回 true。 |
| ctrlKey | 如果按下 Control 键，则返回 true。 |
| localMousePosition | 当前目标坐标系中的鼠标位置。 |
| modifiers | 标志集，用于保存所按修改键（Alt、Control、Shift、Windows/Command）。 |
| mouseDelta | 上次鼠标事件与这次鼠标事件之间的鼠标位置差别。 |
| mousePosition | 面板坐标系中的鼠标位置。 |
| shiftKey | 如果按下 Shift 键，则返回 true。 |
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