org.eclipse.swt.layout

The following example code creates a FormLayout and then sets it into a Shell:

 Display display = new Display ();
 Shell shell = new Shell(display);
 FormLayout layout = new FormLayout();
 layout.marginWidth = 3;
 layout.marginHeight = 3;
 shell.setLayout(layout);
 

To use a FormLayout, create a FormData with FormAttachment for each child of Composite. The following example code attaches button1 to the top and left edge of the composite and button2 to the right edge of button1 and the top and right edges of the composite:

 FormData data1 = new FormData();
 data1.left = new FormAttachment(0, 0);
 data1.top = new FormAttachment(0, 0);
 button1.setLayoutData(data1);
 FormData data2 = new FormData();
 data2.left = new FormAttachment(button1);
 data2.top = new FormAttachment(0, 0);
 data2.right = new FormAttachment(100, 0);
 button2.setLayoutData(data2);
 

Each side of a child control can be attached to a position in the parent composite, or to other controls within the Composite by creating instances of FormAttachment and setting them into the top, bottom, left, and right fields of the child's FormData.

If a side is not given an attachment, it is defined as not being attached to anything, causing the child to remain at its preferred size.