I'm working on an XSL:FO template editor and I want to do a realtime
preview of what
it will look like. I just want to render it to a component and then
refresh it quickly. I have
been unsuccessful at making anything render directly from a bytestream
in memory,
so I'm writing it out to a temp file and then reading it in with
FOInputHandler inputHandler = new FOInputHandler(new
java.io.File("/tmp/foo.foo"));
which seems to work. Eventually I want to avoid the disk altogether and
just do it from
memory, but I'll take what I can get for now.
My main problem is that I can't get the window to refresh. In the code
below 'setup()' is
called once and then 'refresh()' is called each time the document is
updated. Originally
I had the Renderer allocated in the setup and reused, but that seemed
never to update
after the first render, so now I allocate a new Renderer each time. What
is the appropriate
way to do this? What objects can I reuse (Renderer? Driver?) and what do
I have
to reallocate each time. Also, what method should I call on the JFrame
to force it
to refresh. Invalidate doesn't always seem to do it. Thanks so much for
your help.
- Joshua
public class FOViewer {
public static String TRANSLATION_PATH =
"/org/apache/fop/viewer/resources/";
JLabel previewImageLabel;
JFrame frame;
public void setup() {
try {
// create a new renderer
frame = new JFrame("fooboo");
previewImageLabel = new JLabel();
frame.getContentPane().add(previewImageLabel);
frame.validate();
frame.setVisible(true);
frame.setSize(400,400);
// renderer.setProgressListener(frame);
} catch (Exception e) {
u.p(e);
}
}
public void refresh(InputStream in) {
try {
// set up the language stuff
String language = null;
if (language == null) {
try {
language = System.getProperty("user.language");
} catch(SecurityException se) {
// if this is running in a secure place
}
}
Translator resource = getResourceBundle(TRANSLATION_PATH +
"resources." + language);
UserMessage.setTranslator(getResourceBundle(TRANSLATION_PATH +
"messages." + language));
resource.setMissingEmphasized(false);
AWTRenderer renderer;
renderer = new AWTRenderer(resource);
renderer.setComponent(frame);
// old stuff
FOInputHandler inputHandler = new FOInputHandler(new
java.io.File("/tmp/foo.foo"));
XMLReader reader2 = inputHandler.getParser();
Driver driver = new Driver();
driver.setRenderer(renderer);
driver.render(reader2, inputHandler.getInputSource()); // old
// driver.render(reader, new InputSource(in)); // new
BufferedImage pageImage = renderer.getLastRenderedPage();
// frame.getContentPane().remove(previewImageLabel);
// frame.invalidate();
// frame.repaint();
// previewImageLabel = new JLabel();
previewImageLabel.setIcon(new ImageIcon(pageImage));
// frame.getContentPane().add(previewImageLabel);
previewImageLabel.invalidate();
frame.invalidate();
previewImageLabel.repaint();
frame.repaint();
u.p("done 1");
} catch (Exception e) {
u.p(e);
}
}
public static SecureResourceBundle getResourceBundle(String path) {
InputStream in = null;
try {
FOViewer foo = new FOViewer();
URL url = foo.getClass().getResource(path);
in = url.openStream();
} catch (Exception ex) {
u.p("Can't find URL to: <" + path + "> " + ex.getMessage());
u.p(ex);
}
return new SecureResourceBundle(in);
}
}
- Joshua
... but I still haven't found what I'm looking for.
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