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Eclipse Plug-in Developer Guide
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Another custom layout in UI Forms is a variation of the RowLayout. If we configure RowLayout to place children vertically (in columns), and to make all controls the same with within the column, we would get several columns (depending on the width of controls), but the last column would typically not be completely filled (depending on the number of controls). Again, if placed in a form, we would get all the controls in one column because RowLayout cannot do 'vertical' wrapping. If we use GridLayout, we must choose the number of columns up front and live with the choice.

There are situations in more complex forms where we want the number of columns to be adaptive. In other words, we would like the number to change depending on the width of the form - use more when possible, drop the number down as the width decreases. We would also like to fill the form area more-less equally (with all the columns roughly the same height). All this can be achieved with ColumnLayout.

Compared to TableWrapLayout, ColumnLayout is much simpler. Hardly any configuration is needed. The only choice you need to make is the range of columns you want to have (default is 1 to 3).

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