How to make certain JavaFX TreeView nodes non-selectable?

问题

I would like to make the 'folder' nodes in my JavaFX TreeView expandable and collapsible but not selectable.

I found this discussion and looked into EventFilter, but there does not appear to be any EventType that corresponds with TreeView selection changes. The second suggestion, a custom selection model, sounds like a deep dive to me. So, am I stuck allowing the selection events to trigger my listener and then sort through the trash there?

回答1:

It's a bit hacky, but I ended up doing it like this:

table.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
    if (newValue != null && !newValue.isLeaf()) {
        Platform.runLater(() -> table.getSelectionModel().clearSelection());
    }
});

For me it was enough to just clear the selection when clicking a non-leaf node. However, it shouldn't be to hard to just reselect the oldValue parameter, but be aware that this will fire a change event again (so does the clearSelection call, that's why the newValue != null check is necessary).

回答2:

There is a similar question posted here:

TreeView - Certain TreeItems are not allowed to be selected

If you use the FilteredTreeViewSelectionModel in the answer that I posted there you can get the desired behaviour by creating a custom TreeItemSelectionFilter and wiring everything up as follows:

MultipleSelectionModel<TreeItem<Object>> selectionModel = tree.getSelectionModel();
TreeItemSelectionFilter<Object> filter = TreeItem::isLeaf;
FilteredTreeViewSelectionModel<Object> filteredSelectionModel = new 
FilteredTreeViewSelectionModel<>(tree, selectionModel, filter);
tree.setSelectionModel(filteredSelectionModel);

This will ensure that only leaf-nodes can be selected as you require.

来源：https://stackoverflow.com/questions/28999674/how-to-make-certain-javafx-treeview-nodes-non-selectable

标签

javafx

treeview