Je ne suis pas sûr si je comprends votre question, vous vouliez dire quelque chose comme ça ..?
import java.net.URL;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class CompositeInComposite {
private Display display = null;
private Shell shell = null;
private Composite composite = null;
private Image img = null;
private URL dog = null;
private URL cat = null;
public CompositeInComposite() {
display = new Display();
shell = new Shell(display);
shell.setLayout(new FillLayout(SWT.VERTICAL));
shell.setSize(300, 300);
Button btn = new Button(shell, SWT.PUSH);
btn.setText("show cat");
btn.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
try {
img = new Image(display, cat.openStream());
composite.redraw();
} catch(Exception ex) {
ex.printStackTrace();
}
}
});
try {
cat = new URL("http://upload.wikimedia.org/wikipedia/commons/thumb/6/64/Collage_of_Six_Cats-02.jpg/250px-Collage_of_Six_Cats-02.jpg");
dog = new URL("http://upload.wikimedia.org/wikipedia/commons/thumb/2/26/YellowLabradorLooking_new.jpg/260px-YellowLabradorLooking_new.jpg");
img = new Image(display, dog.openStream());
} catch (Exception e) {
e.printStackTrace();
}
composite = new Composite(shell, SWT.BORDER);
composite.addPaintListener(new PaintListener() {
@Override
public void paintControl(PaintEvent e) {
e.gc.drawImage(img, 0, 0);
}
});
// shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
public static void main(String[] args) {
new CompositeInComposite();
}
}
L'alignement du bouton, sa taille, etc. est juste une bonne configuration du gestionnaire de mise en page, je recommanderais MigLayout comme meilleur gestionnaire de mise en page de l'OMI qui existe.