JavaFX CheckBoxTreeItem 选择

Question

我有一个 javafx 复选框树。单击树项时，我需要选中复选框。我为 TreeView 的选择属性添加了一个监听器。但仅当单击树项时才会触发监听器。单击复选框时不会触发上述监听器。

必需:在 TreeView 中单击树项或复选框时触发的监听器。

代码:

String memberArray = {"subChild1", "subChild2", "childSub1"}
Group groupRoot = new Group();
Scene scene = new Scene(groupRoot, Color.ALICEBLUE);
HBox hBox = new HBox();
hBox.setMaxWidth(fxPanel.getWidth());
final Label royalLabel = new Label("Select a item");

TreeSet<String> prefixMember = new TreeSet<String>();
String tmpName = null;
LinkedHashSet<CheckBoxTreeItem<String>> treeItems = new LinkedHashSet<CheckBoxTreeItem<String>>();
LinkedHashSet<CheckBoxTreeItem<String>> treeSubItems = new LinkedHashSet<CheckBoxTreeItem<String>>();

for (String item : memberArray) {
    if (!item.isEmpty()) {
        tmpName = item.substring(0, 3);
        prefixMember.add(tmpName);
    }
}

// Create and empty TreeView
TreeView<String> duckTree = new TreeView<String>();

// Create TreeItems for the Hierarchy of the TreeView
CheckBoxTreeItem<String> root = new CheckBoxTreeItem<String>("Parent");
CheckBoxTreeItem<String> lm1 = new CheckBoxTreeItem<String>("Child1");
CheckBoxTreeItem<String> lm2 = new CheckBoxTreeItem<String>("Child2");

for (String item : prefixMember) {
    CheckBoxTreeItem<String> treeItem = new CheckBoxTreeItem<String>(item.toString());
    for (String subItem : memberArray) {
        if (!subItem.isEmpty() && subItem.substring(0, 3).equals(item)) {
            CheckBoxTreeItem<String> treeSubItem = new CheckBoxTreeItem<String>(
                        subItem.toString());
                    treeSubItems.add(treeSubItem);
        }
    }
    treeItems.add(treeItem);
    treeItem.getChildren().addAll(treeSubItems);
    treeSubItems.clear();
}

root.getChildren().addAll(treeItems);
treeItems.clear();

// Create a TreeView using the root TreeItem
TreeView<String> royalTree = new TreeView<String>(root);
royalTree.setCellFactory(CheckBoxTreeCell.<String>forTreeView());

// Set a ChangeListener to handle events that occur with a Treeitem
// is selected
royalTree.getSelectionModel().selectedItemProperty()
        .addListener(new ChangeListener<TreeItem<String>>() {
            public void changed(
                    ObservableValue<? extends TreeItem<String>> observableValue,
                    TreeItem<String> oldItem, TreeItem<String> newItem) {
                // Gets fired only on selection of tree item
                // Need to get fired on selection of check box too
                // Select the respective checkbox on selection of tree item
            }
        });

hBox.getChildren().add(royalTree);
groupRoot.getChildren().add(hBox);
fxPanel.setScene(scene);

Answer 1

您可以将一个 EventHandler 添加到树中的根项:

rootItem.addEventHandler(CheckBoxTreeItem.checkBoxSelectionChangedEvent(), new EventHandler<TreeModificationEvent<Object>>() {

            @Override
            public void handle(TreeModificationEvent<Object> event) {
                // Your code here.
            }
        });