VideoScalingMode

不缩放

等比缩放，直到一个维度适合

等比缩放，直到影片填满可见边界，一个维度可能被剪裁内容

非等比缩放，两个渲染尺寸都将与可见边界完全匹配

Returns a representation of an immutable list of all enum entries, in the order they're declared.

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Returns an array containing the constants of this enum type, in the order they're declared.