The splittable and collapsible Properties

If you would like to make your layout components splittable, you could assign the splittable property to be true.

In addition, you could make a layout component collapsible by specifying the collapsible property to be true.

<borderlayout height="500px">
    <north size="20%" splittable="true" collapsible="true"/>    
<east size="20%" splittable="true" collapsible="true"/>
    <center border="normal"/>    
<west size="20%" splittable="true" collapsible="true"/>
<south size="30%" border="normal" splittable="true" collapsible="true"/>
</borderlayout>

The maxsize and minisize Properties

When you make a layout component splittable, maxsize and minisize are two properties to determine the re-resizing range of it.

<north splittable="true" maxsize="500" minisize="200"/>