Question

我想创建显示不同内容的标签作为tableview。但是，它仅显示每个选项卡中没有列和内容的表。以下是相关代码。

@Override
public void start(Stage primaryStage) {
    this.primaryStage = primaryStage;
    this.primaryStage.setTitle(WINDOW_TITLE);
    showWindow();
}

public void showWindow() {
    try {
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(UserInterface.class.getResource(MAIN_WINDOW_LAYOUT));
        AnchorPane page = (AnchorPane) loader.load();
        Scene scene = new Scene(page);
        primaryStage.setScene(scene);
        primaryStage.show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

/**
 * Returns the main stage.
 *
 * @return primaryStage
 */
public Stage getPrimaryStage() {
    return primaryStage;
}

public static void main(String[] args) {
    launch(args);
}

创建表的表类

/**
 * Creates a Task Table to display tasks
 *
 */
protected TaskTable(ArrayList<Tasks> taskListToDisplay) {
    FXMLLoader loader = new FXMLLoader(getClass().getResource(LOCATION_TASK_TABLE_FXML));
    loader.setController(this); // Required due to different package declaration from Main
    setTable(taskListToDisplay);
    indexCol.getStyleClass().add("align-center");
    timeCol.getStyleClass().add("align-right");
    indexCol.setCellValueFactory(new PropertyValueFactory<>("index"));
    descriptionCol.setCellValueFactory(new PropertyValueFactory<>("description"));
    timeCol.setCellValueFactory(new PropertyValueFactory<>("time"));
    table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

}


/**
 * Create task table to display
 */
public ObservableList<TaskModel> getTaskList(ArrayList<Tasks> currentList) {
    ObservableList<TaskModel> taskData = FXCollections.observableArrayList();
    DateDisplay display = new DateDisplay();

    for (int i = 0; i < currentList.size(); i++) {
        Tasks currentTask = currentList.get(i);
        taskData.add(new TaskModel(i + 1, currentTask.getDescription(),
                display.getDurationString(currentTask)));
    }
    return taskData;
}

public Node getTaskTable(){
    return this.taskTable;
}

public TableView getTable(){
    return this.table;
}

public void setTable(ArrayList<Tasks> taskList){
    table.setItems(getTaskList(taskList));
}

public void setObservableTable(ObservableList taskList) {
     table.getItems().setAll(taskList);
}

和TabHandler

    // -----------------------------------------
    // FXML variables
    // -----------------------------------------
    @FXML
    private TextField userCommand;
    @FXML
    private Label feedback;
    @FXML
    private Tab toDoTab;
    @FXML
    private Tab completedTab;
    @FXML
    private TabPane tabPane;
    @FXML
    private TaskTable toDoTaskTable = new TaskTable();
    @FXML
    private TaskTable completedTaskTable = new TaskTable();

    // -----------------------------------------
    // Class variables
    // -----------------------------------------
    private ArrayList<Tasks> currentToDoList = new ArrayList<Tasks>();
    private ArrayList<Tasks> currentCompletedList = new ArrayList<Tasks>();


    // -------------------------------------------------------
    // Message String
    // -------------------------------------------------------

    private static final String PROMPT_USERCOMMAND_TEXT = "Enter command";
    private static final String PROMPT_USERCOMMAND_CLEAR = "";


    @FXML
    private void initialize() throws Exception {
                initGUI();
                handleUserInput();
    }

    public void handleUserInput() {
        userCommand.setOnKeyPressed(e -> {
            if (e.getCode().equals(KeyCode.ENTER)) {
                String userInput = userCommand.getText();
                FeedbackMessage output;
                try {
                    output = getOutputFromLogic(userInput);

                    currentToDoList = output.getIncompleteTaskList();
                    currentCompletedList = output.getCompleteTaskList();

                    toDoTaskTable = new TaskTable(currentToDoList);
                    completedTaskTable = new TaskTable(currentCompletedList);

                    toDoTab.setContent(toDoTaskTable.getTable());
                    completedTab.setContent(completedTaskTable.getTable());

                    feedback.setText(output.getFeedback());
                } catch (Exception e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }


        });
    }

    public void initGUI() {
            toDoTaskTable.setTable(currentToDoList);
            completedTaskTable.setTable(currentCompletedList);
            toDoTab.setContent(toDoTaskTable.getTableView());
            completedTab.setContent(completedTaskTable.getTableView());
    }

Answer 1

你不应该这样做：

@FXML
private TaskTable toDoTaskTable = new TaskTable();

有一个原因是您使用@FXML注释字段，并且在加载FXML时，此字段将与所有其他字段一起实例化。

如果使用关键字new重新实例化，则原始控件的引用将丢失（控件应该在FXML中存在）。在新创建的实例上调用setTable时，您将向此对象添加数据，该数据与FXML上显示的对象无关，因此它始终显示为空。

我猜测（从您提出问题的方式，我应该猜对了）TaskTable是一个自定义组件。如果是，则可以轻松地将自定义组件导入场景构建器。有questions and answers可以帮助您。

从上述代码中删除new TaskTable()并修复其他问题后，您的代码就会开始运行。

Javafx，无法将tableview内容显示到不同的选项卡？

1 个答案: