| [news.eclipse.tools] Re: pb building TreeView |
I've resolved the pb. Instead of getting the root element (ElementImpl) of
my DOM tree, I retrieve the whole document (DocumentImpl), which will be
the root. Then my root element is a child of the doc.
anthony saucet wrote:
> You were right, now I size the array with getLength() and tree.setInput()
> works perfectly. It seems to build a tree in memory and then expand the
> tree in the view, BUT without the root element.
> What's the trick to display it?
> anthony
> Knut Radloff wrote:
> > I just noticed that you initialize your children array (elnts) to a fixed
> size. The array you return must only have enough slots for
> > all the children and no extra null slots. That's probably what's causing
the
> exception.
> > You need to size it to getChildNodes().getLength(). If you have no children
> an empty array will be returned.
> > Knut
> > "anthony saucet" <anthony.saucet@xxxxxxxxxxx> wrote in message
> news:b8bjer$6na$1@xxxxxxxxxxxxxxxx
> > > getChildNodes() is not null BUT getChildNodes().getLength() = 0 !!!
> > > I've printed out what happens in class contentProvider:
> > >
> > > getChildNodes: !null
> > > j: 0 /* getChildNodes().getLength() */
> > > contentPovider getChildren end /* end of method getChildren() */
> > > hasChild /* call method hasChild */
> > > contentPovider getChildren /* calls method getChildren() */
> > >
> > > and when tries j = getChildNodes().getLength(), stops here and after lot
> > > of things I didn't catch, exception.
> > > anthony
> > >
> > >
> > > Knut Radloff wrote:
> > >
> > > > Does getChildNodes return null when there are no more children? You can
> set
> > > an exception breakpoint in the debugger and find
> > > > out.where the exception is occurring.
> > >
> > > > Knut
> > >
> > > > PS: Please continue the thread on eclipse.platform, eclipse.tools
should
> no
> > > longer be used and will be made read-only soon.
> > >
> > > > "anthony saucet" <anthony.saucet@xxxxxxxxxxx> wrote in message
> > > news:b8bbcv$u1r$1@xxxxxxxxxxxxxxxx
> > > > > I'm trying to build a TreeView in my perspective to have a look on a
> DOM
> > > > > tree built in memory.
> > > > > I've implemented the TreeView with new TreeViewer, called
> > > > > setContentProvider() and setLabelProvider(). setInput() gets the
> > > > > rootElement of my DOM tree. Then in class contentProvider, the tree
is
> > > > > being built by getChildren(), and everything seems ok.
> > > > > here's the code to get the children:
> > > > >
> > > > > public Object[] getChildren(Object element) {
> > > > > Object elnts[]=new Object[20];
> > > > > int i = 0;
> > > > > int j=((Element)element).getChildNodes().getLength();
> > > > >
> > > > > for(Node child = ((Element)element).getFirstChild(); i<j;
> > > > > ((Element)element).getNextSibling()){
> > > > > elnts[i]=((Element)element).getChildNodes().item(i);
> > > > > i++;
> > > > > }
> > > > > return elnts;
> > > > > }
> > > > >
> > > > > I don't really know what happens BUT when it arrives at the end, when
> no
> > > > > more child or items, it tries to continue and to create the tree and
> the
> > > > > following message appears:
> > > > > "Unable to create part: Tree" from
> > > > > eclipse.core.internal.runtime.InternalPlatform
> > > > > and the exception: "nullPointerException".
> > > > >
> > > > > Does anybody have an idea of what I need to do, or what I missed ?
> > > > > many thx
> > > > >
> > >
> > >
> > >
> > >
> > >