On 1/4/07, Mats Norén <[EMAIL PROTECTED]> wrote:
> Hi,
> I'm trying to find an example using the tree table with a dynamic
> model that get's reloaded every request. The current example in
> wicket-examples uses an ordinary TreeModel which is static.
>
> Is it as simple as attaching a LDM which returns a TreeModel in load()?
Then you would have to reset/ re-render the tree from scratch every
time. Your best bet is probably to look at Swing examples that do
this; the idea should be the same.
One way to load lazily - though keep in mind it doesn't clean up when
nodes are unfolded again - is to override DefaultMutableTreeNode's
getChildCount method, so that it lazily initializes itself, adding any
child nodes on the first call. Code that I'm using in project looks
like this:
private static final class FileTemplateTreeNode extends
TemplateTreeNode {
boolean checkedChilds = false;
private final File baseDir;
private final String displayName;
private final File file;
private final String location;
public FileTemplateTreeNode(File baseDir, String location) {
this(baseDir, location, location);
}
public FileTemplateTreeNode(File baseDir, String location,
String
displayName) {
super(location);
this.baseDir = baseDir;
if (location == null) {
throw new IllegalArgumentException("location
must be not null");
}
this.location = location;
this.displayName = displayName;
this.file = new File(baseDir, location);
}
@Override
public int getChildCount() {
if (!checkedChilds) {
checkedChilds = true;
if (file.isDirectory()) {
for (String f :
file.list(TEMPLATE_FILTER)) {
add(new
FileTemplateTreeNode(baseDir, f));
}
}
}
return super.getChildCount();
}
...
TemplateTreeNode is a simple extension of DefaultMutableTreeNode.
Eelco
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