如何在JavaFX中使用treeview在主文件夹中创建多个文件夹？

Question

为了说明这一点，我正在创建一个treeview，它将在用户创建一个文件夹后实例化自己，并且所述文件夹将被添加为TreeItem。

我现在有这个：

TreeView treeView = new TreeView();

// Create new folder
MenuItem menuItem1 = new MenuItem("Create New Folder");
menuItem1.setOnAction(e -> {
    System.out.println("Please name your directory:");
    Scanner in = new Scanner(System.in);
    String strFolder = in. nextLine();
    createFolder(strFolder); // Create folder
    TreeItem rootFolder = new TreeItem(strFolder); // Create new TreeItem
    treeView.setRoot(rootFolder); // Replace old folder with new one
    // rootFolder.getChildren().add(rootFolder);
    // rootItem.getChildren().add(rootFolder);

});

多谢了。

Answer 1

只需将TreeItem添加到TreeItem的子列表中。如果未选择任何项,则以下示例将替换根项,否则将新项添加为所选项的子项：

TreeView<String> treeView = new TreeView<>(); // never use raw type without good reason

// Create new folder
MenuItem menuItem1 = new MenuItem("Create New Folder");
menuItem1.setOnAction(e -> {
    TextInputDialog dialog = new TextInputDialog(); // replacing console input with dialog here

    dialog.setHeaderText("Please name your directory:");
    String strFolder = dialog.showAndWait().orElse(null);

    if (strFolder != null) {
        TreeItem<String> newFolder = new TreeItem<>(strFolder); // Create new TreeItem

        TreeItem<String> selection = treeView.getSelectionModel().getSelectedItem();

        createFolder(strFolder); // Create folder ; TODO: make dependent on parent???

        if (selection == null) {
            treeView.setRoot(newFolder); // Replace old folder with new one
        } else {
            selection.getChildren().add(newFolder);
            selection.setExpanded(true); // make sure we're able to see the new child
        }
    }
});