Set a negative value for y-offset to shift the shadow to the top.
设置一个负值的y轴偏移转将阴影转移到顶部。
The top left corner of any component is represented by x and y values.
任何组件的左上角都由x和y 值表示。
J represents distance above reference point Y (top of mount bracket).
J代表距离参考点y的距离(安装托架顶部)。
J represents distance above reference point Y (top of mount bracket).
J代表距离参考点y的距离(安装托架顶部)。
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