import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class ControlSizeTest {

	public static void main(String[] args) {
		final Display display = new Display();

		final Shell shell = new Shell(display);

		final Button checkbox = new Button(shell, SWT.CHECK);
		checkbox.setText("This should be a longer text");

		final Button anotherButton = new Button(shell, SWT.PUSH);
		anotherButton.setText("Button");

		shell.setLayout(new Layout() {
			@Override
			protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
				return new Point(200, 100);
			}

			@Override
			protected void layout(Composite composite, boolean flushCache) {
				checkbox.setBounds(0, 0, 100, 20);

				anotherButton.setBounds(100, 0, 100, 20);
			}
		});

		shell.setSize(300, 200);
		shell.open();

		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}

		display.dispose();
	}
}