To specify the properties of each cell individually, GridLayout USES a GridData class.

要分别指定每个单元的属性，GridLayout使用了griddata类。

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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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