To provide this type of refined control for each cell, the controls added to a GridLayout managed composite can have instances of GridData (a LayoutData sub-class).

为了给每个单元格提供这种精确控制，添加到 GridLayout 的托管复合控件的控件可以拥有 GridData 实例（LayoutData 的子类）。

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Some layout managers are controlled by parameters just on themselves, and others also require additional parameters, LayoutData, specified on each control in the composite they manage.

一些布局管理器只使用它们自身的参数就可以控制，而另一些布局管理器还需要其他参数——Layout Data，该参数是在它们管理的复合控件中的每个控件上指定的。

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