public void buttonClicked(ActionEvent e) {
CustomButtonNode currentButton = (CustomButtonNode) e.getSource();
if (currentButton.isExpanded()) {
collapseNode(currentButton);
} else {
expandNode(currentButton);
}
}
// called when a component is being expanded that has expanded child button nodes
private void expandChildrenOf(CustomButtonNode button) {
int index = treeStructure.getChildren().indexOf(button);
List children = button.getChildren();
// inserts node items into the appropriate positions in the panelGrid
// children collection
for (int a = 0; a < children.size(); a++) {
treeStructure.getChildren().add(index + 1 + a, (UIComponent) children.get(a));
}
// checks every child, if it is a button and its expanded state is set to true,
// recursively call the method to expand the child node
for (int a = 0; a < children.size(); a++) {
Object curChild = children.get(a);
if (curChild instanceof CustomButtonNode) {
CustomButtonNode curButton = (CustomButtonNode) curChild;
if (curButton.isExpanded()) {
this.expandChildrenOf(curButton);
}
}
}
}