JLIST - Scrollpane woes

[Kurt M Peters]

I am having a problem getting a JList to scroll.
I am using an extension of AbstractListModel at a model in a JList:
public class TreeSetListModel extends AbstractListModel {
private Set<String> treeSetList;
/** Creates a new instance of TreeSetListModel */
public TreeSetListModel(Set<String> inSet) {
treeSetList = inSet;
}
....
}

For the life of me, I cannot get the vertical scrollbar to scroll. The
horizontal one does (which actually is useless). Does anyone have any ideas
what I'm going wrong? Please see comments and code handling the guilty
objects below:

jSPListNodes = new JScrollPane(JListNodes);
JListNodes = new javax.swing.JList();

jSPListNodes = new JScrollPane(JListNodes);
jSPListNodes.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
jSPListNodes.setVerticalScrollBarPolicy(javax.swing.ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
jSPListNodes.setAutoscrolls(true);
jSPListNodes.setMaximumSize(new java.awt.Dimension(48, 48));
jSPListNodes.setPreferredSize(new java.awt.Dimension(48, 48));
jSPListNodes.setViewportView(JListNodes);

jPNodeComponentSelections.add(jSPListNodes,
java.awt.BorderLayout.WEST);
JListNodes.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
JListNodes.setFixedCellHeight(48);
JListNodes.setMaximumSize(new java.awt.Dimension(264, 264));
JListNodes.setMinimumSize(new java.awt.Dimension(52, 70));
JListNodes.setPreferredSize(new java.awt.Dimension(52, 80));
JListNodes.setVisibleRowCount(2);
// after creating and filling a TreeSet, I put it in the List
JListNodes.setModel(new TreeSetListModel(nodeSet));
//I even tried to revalidate, which doesn't seem to work:

JListNodes.revalidate();
jPNodeComponentSelections.revalidate();
jSPListNodes.revalidate();

Thanks in advance,
Kurt

 

[Andrey Kuznetsov]

JListNodes.setMaximumSize(new java.awt.Dimension(264, 264));

JListNodes.setMinimumSize(new java.awt.Dimension(52, 70));
JListNodes.setPreferredSize(new java.awt.Dimension(52, 80));

don't set preferredSize.

 

[Stefan Ram]

don't set preferredSize.

Could someone please explain why not?

 

[Andrey Kuznetsov]

JListNodes.setPreferredSize(new java.awt.Dimension(52, 80));

Could someone please explain why not?

because preferred size is used by JScrollPane's (or may be JVievport's)
LayoutManager.
If preferred size set explicitly, then JList's size is no more changed
according to its requrements.

 

[Kurt M Peters]

Thanks, I will give it a try. I probably will have to do some special
"manuevering" with Netbeans to NOT set prefered size. Does anyone have any
hints on how to reset prefered size to "not be set" in Netbeans?

Regards,
Kurt