javafx.scene.control.TreeItem#isExpanded ( )源码实例Demo

private void reveal(final TreeItem<ScanCommand> item)
{
    // Expand tree up to parent because 'getRow' will
    // only find items that are expanded
    TreeItem<ScanCommand> parent = item.getParent();
    while (parent != null)
    {
        if (! parent.isExpanded())
            parent.setExpanded(true);
        parent = parent.getParent();
    }

    // Scroll to the active command
    final int row = getRow(active_item);
    if (row >= 0)
    {
        // Try to show one command above the desired one to get some context
        if (row > 1)
            scrollTo(row-1);
        else
            scrollTo(row);
    }
}
 

private void extractDataFromTree(
		ArrayList<ObjectInStructure> treedata,
		TreeItem<ObjectDataElt> nodetoprocess,
		int leveltouse,
		String cascadetouse,
		int circuitbreaker) {
	if (circuitbreaker > CObjectTreeArray.TREE_NAVIGATION_CIRCUITBREAKER)
		throw new RuntimeException("Circuit Breaker on too deep recursive structure");
	String currentnodecascade = cascadetouse;
	int levelforchildren = leveltouse;

	if (nodetoprocess.getValue() != null) {
		currentnodecascade = (cascadetouse.length() > 0 ? cascadetouse : "1");
		boolean leaf = true;
		if (nodetoprocess.getChildren().size() > 0)
			leaf = false;
		treedata.add(new ObjectInStructure(nodetoprocess.getValue(), currentnodecascade, leveltouse, leaf));
		levelforchildren++;
	}
	if (nodetoprocess.isExpanded()) {
		Iterator<TreeItem<ObjectDataElt>> childreniterator = nodetoprocess.getChildren().iterator();
		int childindex = 0;
		while (childreniterator.hasNext()) {
			childindex++;
			TreeItem<ObjectDataElt> thischild = childreniterator.next();
			String childcascade = currentnodecascade + (currentnodecascade.length() > 0 ? "." : "") + childindex;
			extractDataFromTree(treedata, thischild, levelforchildren, childcascade, circuitbreaker + 1);
		}
	}
}
 

private ObservableList<TreeItem<File>> getLoadedChildren(TreeItem<File> item) {
	return (item instanceof FileTreeItem && !item.isExpanded())
		? ((FileTreeItem)item).getLoadedChildren()
		: item.getChildren();
}