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Using Layout Data Objects to control layout

import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class LayoutDataControlLayout {   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display);     shell.setLayout(new GridLayout()); // Only with GridLayout you can use GridData     Text text = new Text(shell, SWT.SINGLE|SWT.BORDER);     text.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL));          shell.setSize(450, 100);     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } } The methods in the Control class to get and set layout data are: public Object getLayoutData()     public void setLayoutData(Object layoutData)