如何刷新阶段，当我点击一个树节点

Question

我有一棵树，它可以生成包含数据的小树。

public TitledPane createConnectionsList(String title) {

        TreeItem<String> rootNode = new TreeItem<>("Connection 1", null);

        rootNode.setExpanded(true);
        for (ConnectionData data : connectionDataList) {
            TreeItem<String> connLeaf = new TreeItem<>(data.getDBGWName());
            boolean found = false;
            for (TreeItem<String> depNode : rootNode.getChildren()) {
                if (depNode.getValue().contentEquals(data.getTableName())) {
                    depNode.getChildren().add(connLeaf);
                    found = true;
                    break;
                }
            }
            if (!found) {
                TreeItem<String> depNode = new TreeItem<>(data.getTableName(), null);
                rootNode.getChildren().add(depNode);
                depNode.getChildren().add(connLeaf);
            }
        }

        VBox box = new VBox();
        final Scene scene = new Scene(box, 700, 600);
        scene.setFill(Color.LIGHTGRAY);

        TreeView<String> treeView = new TreeView<>(rootNode);

        treeView.setShowRoot(true);
        treeView.setEditable(true);

        AnchorPane content = new AnchorPane();
        // Set aligment - fill the accordion with the three content

        AnchorPane.setLeftAnchor(treeView, 0d);
        AnchorPane.setRightAnchor(treeView, 0d);
        AnchorPane.setBottomAnchor(treeView, 0d);
        AnchorPane.setTopAnchor(treeView, 0d);

        content.getChildren().add(treeView);
        // Add to TitelPane
        TitledPane pane = new TitledPane(title, content);
        return pane;
    }

public List<ConnectionData> connectionDataList;

    public static class ConnectionData {

        private String DBGWName;
        private String TableName;

        public ConnectionData(String DBGWName, String TableName) {

            this.DBGWName = DBGWName;
            this.TableName = TableName;

        }

        public String getDBGWName() {
            return DBGWName;
        }

        public void setDBGWName(String DBGWName) {
            this.DBGWName = DBGWName;
        }

        public String getTableName() {
            return TableName;
        }

        public void setTableName(String TableName) {
            this.TableName = TableName;
        }
    }

connectionDataList = Arrays.<ConnectionData>asList(
                new ConnectionData("Table 1", "DBGW1"),
                new ConnectionData("Table 2", "DBGW1"),
                new ConnectionData("Table 3", "DBGW1"),
                new ConnectionData("Table 4", "DBGW1"),
                new ConnectionData("Table 5", "DBGW1"),
                new ConnectionData("Table 6", "DBGW2"),
                new ConnectionData("Table 7", "DBGW2"),
                new ConnectionData("Table 8", "DBGW2"),
                new ConnectionData("Table 9", "DBGW2"),
                new ConnectionData("Table 10", "DBGW2"),
                new ConnectionData("Table 11", "DBGW2"),
                new ConnectionData("Table 12", "DBGW3"));

我想当我点击主节点Connection 1打开一个对话框。我还想当我点击DBGW1子节点打开一个新的对话框窗口，当我点击子节点Table打开3td简单对话框。我必须在哪里以及如何放置事件侦听器，以便调用Java方法或刷新主阶段。

Answer 1

为了让你了解情况：treeItem是一个东西，它被添加到树结构中。之后，将为每个treeItem创建一个treeCell。从技术上讲，默认情况下有一个默认的treeCellFactory，但您可以创建自己的工厂，这将为每个treeItem创建一个TreeCell。

对于每个treeCell，您可以手动添加一个侦听器，它将侦听交互事件，并相应地对它们做出反应。

但是，交互的情况很简单：可以在当前关注的节点或当前选定的节点上添加侦听器。（看来，聚焦节点是最佳选择）。

所以，使用以下方法：

    TreeView tv = new TreeView();
    tv.getFocusModel().focusedIndexProperty().addListener(...);
    tv.getFocusModel().focusedItemProperty().addListener(...);
    tv.getSelectionModel().selectedIndexProperty().addListener(...);
    tv.getSelectionModel().selectedItemProperty().addListener(...);