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Specify the offset of the control side from the attachment position

Positive value: the control side is offset to the right of or below the attachment position. Negative value: the control side is offset to the left of or above the attachment position. import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class FormLayoutControlOffsetAttachment {   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setLayout(new FormLayout());     Button button1 = new Button(shell, SWT.PUSH);     button1.setText("button1");     Point size = button1.computeSize(SWT.DEFAULT, SWT.DEFAULT);     int offset = size.x / 2;     FormData formData = new FormData();     formData.left = new FormAttachment(50, -1 * offset);     button1.setLayoutData(formData);     shell.setSize(450, 400);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }