| Problems with TreeItem.getItems() [message #280079] |
Fri, 28 January 2005 14:02 |
Eclipse User |
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Originally posted by: devin_steffler.ca.ibm.com
I'm having problems with TreeItem.getItems() and was told that I should seek
help on this newsgroup. Please point me in the appropriate direction if
this is not the case.
Example problem:
-------------------------------------------------
TreeViewer with a Tree that has the following structure:
TreeItem[0] {IASTTranslationUnit} // there are supposed to be more TreeItems
underneath this TreeItem that I want to access via TreeItem[0].getItems()
TreeItem[1] {} // object with ID 1234 (arbitrary ID)
When I invoke TreeItem[0].getItems() I get a TreeItem array that contains
one element. That element is the TreeItem[1] {} with object ID 1234 above
(which doesn't make sense to me).
When the view is displayed in Eclipse there are several items that appear as
children to TreeItem[0] however I can't seem to access those TreeItems
programatically from the Tree.
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Here's the problematic code:
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public void run() {
// take a snapshot of the current tree expansion
Object[] expandedElements = viewer.getExpandedElements();
// set the new content provider
viewer.setContentProvider(new ViewContentProvider(file));
viewer.refresh(); // suggested to help fix the problem, didn't work
// set the expansion of the new view based on the original snapshot
Tree tree = viewer.getTree();
if (expandedElements.length > 0) {
expandTreeIfNecessary(tree.getItems(), expandedElements);
}
viewer.refresh();
}
private void expandTreeIfNecessary(TreeItem[] treeItems, Object[]
expandedElements) {
for (int i=0; i<treeItems.length; i++) {
for (int j=0; j<expandedElements.length; j++) {
// if the items are a "close enough" match then expand the new TreeItem
if (treeItems[i].getData() instanceof TreeObject &&
expandedElements[j] instanceof TreeObject &&
((TreeObject)treeItems[i].getData()).getFilename().equals((( TreeObject)expan
dedElements[j]).getFilename()) &&
((TreeObject)treeItems[i].getData()).toString().equals(((Tre eObject)expanded
Elements[j]).toString())) {
treeItems[i].setExpanded(true);
// determine if children need to be expanded or not
expandTreeIfNecessary(treeItems[i].getItems(), expandedElements);
// the treeItems[i].getItems() seems problematic as it returns a TreeItem[1]
with a null data object
}
}
}
}
-------------------------------------------------
Thanks for your help,
Devin Steffler
IBM's Eclipse CDT
Ottawa (Palladium), Ontario, Canada
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