tests/org.eclipse.swt.tests.gtk/ManualTests/org/eclipse/swt/tests/gtk/snippets/Bug533469_GhostButton.java

/*******************************************************************************
 * Copyright (c) 2018 Red Hat and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Red Hat - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.tests.gtk.snippets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/*
 * On GTK3.18: Empty Shell
 * On GTK3.20+: Button/Text/etc is visible when size is 0x0
 */
public class Bug533469_GhostButton {
	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);

		Text text = new Text(shell, SWT.None); // text size is not set, it
												// should be 0x0
		text.setText("hello");
		text.setVisible(true);

		Button button = new Button(shell, SWT.None);
		button.setText("Hi"); // size is not set, it should be 0x0

		Group group = new Group(shell, SWT.None);
		group.setText("Hi Group"); // size is not set, it should be 0x0
		System.err.println(group.getSize());

		shell.setSize(300, 300);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}