public class SnippetDrawOverButton {

public static void main(String [] args) {
	var display = new Display();
	var shell = new Shell(display);
	shell.setLayout(new FillLayout());
	Button button = new Button(shell, SWT.CHECK);
	button.setText("SnippetDrawOverButton");
	Font initialFont = button.getFont();
	FontData[] fontData = initialFont.getFontData();
	for (FontData element : fontData) {
		element.setHeight(24);
	}
	Font newFont = new Font(display, fontData);
	button.setFont(newFont);
	button.addPaintListener(event -> {
		Point rect = button.getSize();
		event.gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
		event.gc.setLineWidth(5);
		event.gc.drawOval(1, 1, rect.x - 2, rect.y - 2);
	});
	shell.pack();
	shell.open ();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}
}