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Disable Tree Item
There isn't a built-in way to "disable" tree nodes. You can somewhat easily prevent selecting "disabled" items by reverting any disallowed selection to the previous selection. This requires that you set the tree in immediate mode though. You can also style tree nodes to look as "disabled":
final Tree tree = new Tree("My Tree");
tree.setContainerDataSource(createTreeContent());
// Show all leaf nodes as disabled
tree.setItemStyleGenerator(new Tree.ItemStyleGenerator() {
public String getStyle(Object itemId) {
if (! tree.hasChildren(itemId))
return "disabled";
return null;
}
});
// Disallow selecting "disabled" leaf nodes
tree.addListener(new Property.ValueChangeListener() {
Object previous = null;
public void valueChange(ValueChangeEvent event) {
if (! tree.hasChildren(tree.getValue()))
tree.setValue(previous);
else
previous = tree.getValue();
}
});
tree.setImmediate(true);
layout.addComponent(tree);
And the CSS:
.v-tree-node-caption-disabled {
color: graytext;
font-style: italic;
}
See a live example
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