A PApplet is an Applet which is, IIRC, an AWT component. Perhaps you need to wrap it in a JComponent before adding it to the JScrollPane? (shot in the dark...)

Hi,

I have found a workaround. The app now checks if it is working on OSX and loads Quaqua, if not it loads Nimbus:

1.     if (System.getProperty("os.name").toLowerCase().startsWith("mac os x")) {
2.             UIManager.setLookAndFeel(ch.randelshofer.quaqua.QuaquaManager
3.                     .getLookAndFeel());
4.         } else {
5.             UIManager
6.                     .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

I have checked on Mac and my Linux box and both look really nice.

However there is yet another problem when running the app on Macs - upon scrolling the Processing applet obscures the rest of UI, rather than containing itself within the JScrollPane, it takes the whole space of the JFrame the application is packed to.
 
This is only seen on Macs, regardless of the l&f. I have already tried putting the class extending PApplet inside JPanel and JInternalFrame, like this:

1.     JInternalFrame sketch = new JInternalFrame();
2.         BasicInternalFrameUI ui = (BasicInternalFrameUI) sketch.getUI();
3.         sketch.putClientProperty("titlePane", ui.getNorthPane());
4.         sketch.putClientProperty("border", sketch.getBorder());
5.         ui.setNorthPane(null);
6.         sketch.setBorder(null);
7.         sketch.add(continuousTreeToProcessing);
8.         sketch.setPreferredSize(new Dimension(2048, 1025));
9.         sketch.setMaximumSize(new Dimension(2048, 1025));
10.         sketch.setResizable(false);
11.         sketch.setVisible(true);
12.         sketch.pack();
13.         JScrollPane rightScrollPane = new JScrollPane(sketch,
14.                 JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
15.                 JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
16.         add(rightScrollPane, BorderLayout.CENTER);

 ...but that didn't help, and they are both subclasses of JComponent...


Oh right I have worked around that one too - simply use awt ScrollPane when running on Mac:

1.             ScrollPane rightScrollPane = new ScrollPane(
2.                     ScrollPane.SCROLLBARS_ALWAYS);
3.             rightScrollPane.add(continuousTreeToProcessing);
4.             add(rightScrollPane, BorderLayout.CENTER);

This unfortunately fails to scroll properly on linux box, so again had to be worked around.

I think the difference is the Java version, as on my linux boxes I use OpenJDK, whilst the Macs have SunJava.