自动更新嵌套项的TreeView

我有一个目标,它有一系列目标。目标有一系列策略。战略有一系列战术。战术有一系列任务。

我希望能够在TreeView中显示它,并且希望树与项目同步。也就是说,如果我删除了一个Objective,该Objective及其子对象也将从TreeView中消失。

到目前为止,这是我一直在尝试的。

/**
 * The base class for all PlanItems, which include ActionItems down to
 * ActionTasks, and Objectives down to Tasks.
 *
 * @author Toni-Tran
 */
public class PlanItem implements Comparable<PlanItem> {
    protected ObservableList<PlanItem> childPlanItems = FXCollections
            .observableArrayList();
    protected TreeItem<PlanItem> treeItem = new TreeItem<>(this);

这是所有这些项的基类。在其构造函数中:

public PlanItem() {
    CustomBinding.bindLists(treeItem.getChildren(), childPlanItems, PlanItem::getTreeItem);
}

我正在使用自定义绑定,它将两个不同对象的列表绑定在一起。(或者,我可以使用EasyBind)。

/**
 * Binds a source list's elements to a destination list. Any changes made in
 * the source list will reflect in the destination list.
 *
 * @param <SRC> The source list's object type.
 * @param <DEST> The destination list's object type.
 * @param dest The destination list that will be bound to the src list.
 * @param src The source list to watch for changes, and propagate up to the
 * destination list.
 * @param transformer A function that will transform a source list data
 * type, A, into a destination list data type, B.
 */
public static <SRC extends Object, DEST extends Object> void bindLists(
        ObservableList<DEST> dest, ObservableList<SRC> src, Function<SRC, DEST> transformer) {
    /*Add the initial data into the destination list.*/
    for (SRC a : src) {
        dest.add(transformer.apply(a));
    }
    /*Watch for future data to add to the destination list. Also watch for removal
     of data form the source list to remove its respective item in the destination
     list.*/
    src.addListener((ListChangeListener.Change<? extends SRC> c) -> {
        while (c.next()) {
            /*Watch for removed data.*/
            if (c.wasRemoved()) {
                for (SRC a : c.getRemoved()) {
                    int from = c.getFrom();
                    dest.remove(from);
                }
            }
            /*Watch for added data.*/
            if (c.wasAdded()) {
                for (SRC a : c.getAddedSubList()) {
                    int indexAdded = src.indexOf(a);
                    dest.add(indexAdded, transformer.apply(a));
                }
            }
        }
    });
}

我不确定这是否是正确的方法。子项列表通常是扩展PlanItem的对象列表,而不仅仅是PlanItem本身。这不应该是一个 ObservableList<? extends PlanItem> 然后这样做会使我的其余代码变得复杂。

计划是创建一个包装PlanItem的TreeItem。然后,将TreeItem的子TreeItems与PlanItem的子PlanItems同步。这对每个嵌套的PlanItem也递归重复。