Tuesday September 01, 2009
Tuesday September 01, 2009
Get Notified When A Window Opens/Closes (Part 2)
New and improved version of what I posted in my blog yesterday, thanks to discussions with Toni Epple, with whom I find myself in the Holiday Inn in Geneva, Switzerland, the evening before the next NetBeans Platform Certified Training, this time in Switzerland,
public class Installer extends ModuleInstall {
@Override
public void restored() {
WindowManager.getDefault().invokeWhenUIReady(new DemoRunnable());
}
private class DemoRunnable implements Runnable {
@Override
public void run() {
//Set property change listener on registry of WindowManager:
WindowManager.getDefault().getRegistry().addPropertyChangeListener(new PropertyChangeListener() {
@Override
//When a change occurs...
public void propertyChange(PropertyChangeEvent evt) {
//Get the events with "opened" as property name,
//i.e., a TopComponent has been opened:
if (evt.getPropertyName().equals("opened")) {
//Get the current list of opened TopComponents:
HashSet<TopComponent> newHashSet = (HashSet<TopComponent>) evt.getNewValue();
//Get the previous list of opened TopComponents:
HashSet<TopComponent>oldHashSet = (HashSet<TopComponent>) evt.getOldValue();
//Iterate through the new list:
for (Iterator<TopComponent> it = newHashSet.iterator(); it.hasNext();) {
//Get the current next TopComponent in the iteration;
TopComponent topComponent = it.next();
//Check that the old set does not contain the current next TopComponent:
if (!oldHashSet.contains(topComponent)) {
//If the old set does not contain the current TopComponent from the new set,
//we have found the TopComponent that has just been opened,
//so let's get the DataObject from its Lookup:
DataObject dObj = topComponent.getLookup().lookup(DataObject.class);
if (dObj != null) {
//Get the FileObject:
FileObject currentFile = dObj.getPrimaryFile();
if (currentFile != null) {
//Get the mime type:
String mimeType = dObj.getPrimaryFile().getMIMEType();
FileObject matchingFile = null;
//Use the appropriate internal method in the Wicket plugin
//(thanks Tim) for finding the matching file,
//either Java or HTML:
if (mimeType.equals("text/html")) {
matchingFile = JavaForMarkupQuery.find(currentFile);
} else if (mimeType.equals("text/x-java")) {
matchingFile = MarkupForJavaQuery.find(currentFile);
}
if (matchingFile != null) {
try {
//Open the found file:
DataObject matchingDobj = DataObject.find(matchingFile);
OpenCookie oc = matchingDobj.getCookie(OpenCookie.class);
oc.open();
} catch (DataObjectNotFoundException ex) {
Exceptions.printStackTrace(ex);
}
//Now the file that the user tried to open,
//together with its matching file,
//should both be open in the editor mode.
}
}
}
}
}
}
}
});
}
}
}
The above is applicable to the Wicket plugin, where opening a Java file now results in the opening of the related HTML file, and vice versa, thanks to the code above.
Sep 01 2009, 03:17:22 PM PDT Permalink
4 Comments
Trackback URL: http://blogs.sun.com/geertjan/entry/get_notified_when_a_window1
Comments:
That's horrible, horrible code.
Posted by Mikael Gueck on September 01, 2009 at 09:52 PM PDT #
That's a horrible, horrible comment.
Posted by Peter Franken on September 01, 2009 at 10:07 PM PDT #
How about
newHashSet.removeAll(oldHashSet); ?
This should leave only new components in newHashSet (those that were not in beforehand) and how about
currentFile.getMIMEType();
instead of
dObj.getPrimaryFile().getMIMEType();
since currentFile was already assigned.
Makes the code perhaps it a bit less horrible (but still won't win a price for beauty).
Couldn't resist ;-)
Posted by Sven Reimers on September 02, 2009 at 03:56 PM PDT #
The return value of getOpened() is Set<TopComponent>. How could you guys come up with a cast to HashSet?
HashSet<TopComponent> newHashSet = (HashSet<TopComponent>) evt.getNewValue();
A kind of "empiristic" programming?
Posted by Jaroslav Tulach on September 07, 2009 at 12:14 AM PDT #
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