Question

我有一个带有主窗口的JavaFX应用程序。点击＆＃34;创建用户＆＃34;按钮，显示一个对话框以获取用户的输入。在＆＃34; OK＆＃34;之后单击对话框上的按钮，禁用对话框并将光标更改为等待，同时应用程序执行创建新用户的必要任务。如果任务成功，将关闭对话框，并显示信息警报以宣布成功。

以下是我从实际代码中简化的代码，以重现我遇到的问题。以下是问题：

为什么dialog.getDialogPane（）。setCursor（Cursor.WAIT）不起作用？我可以使用primaryStage.getScene（）。setCursor（Cursor.WAIT）更改主窗口上的光标。但是如何更改对话框上的光标？
当显示警报时，即使在显示警报之前调用了dialog.close（），似乎也无法关闭对话框（但是，如果我只用一个按钮就可以简化对话框，没有别的，当我调用dialog.close（）时它会消失。此外，当我拖动警告框时，对话框及其后面的主窗口不会刷新。所以似乎代码不对。

代码：

import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Dialog;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Demo extends Application {

    private Dialog<String> dialog;
    private Button createUserButton = new Button("Create User");

    @Override
    public void start(Stage primaryStage) throws Exception {
        Text usersLabel = new Text("Current Users:");
        TableColumn<User, String> indexColumn = new TableColumn<User, String>("No.");
        indexColumn.setMaxWidth(1f * Integer.MAX_VALUE * 10);
        indexColumn.setCellValueFactory(p -> p.getValue().indexProperty());
        TableColumn<User, String> userNameColumn = new TableColumn<User, String>("User Name");
        userNameColumn.setMaxWidth(1f * Integer.MAX_VALUE * 60);
        userNameColumn.setCellValueFactory(p -> p.getValue().userNameProperty());
        TableColumn<User, String> roleColumn = new TableColumn<User, String>("Role");
        roleColumn.setMaxWidth(1f * Integer.MAX_VALUE * 30);
        roleColumn.setCellValueFactory(p -> p.getValue().roleProperty());
        TableView<User> tableView = new TableView<User>();
        tableView.getColumns().add(indexColumn);
        tableView.getColumns().add(userNameColumn);
        tableView.getColumns().add(roleColumn);
        tableView.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
        Text dummyLabel = new Text("");
        createUserButton.setOnAction(event -> showDialog());
        VBox leftPane = new VBox(5);
        leftPane.getChildren().addAll(usersLabel, tableView);
        VBox rightPane = new VBox(20);
        rightPane.setFillWidth(true);
        rightPane.getChildren().addAll(dummyLabel, createUserButton);
        GridPane mainPane = new GridPane();
        mainPane.setPadding(new Insets(10, 0, 0, 10));
        mainPane.setHgap(20);
        mainPane.add(leftPane, 0, 0);
        mainPane.add(rightPane, 1, 0);
        Scene scene = new Scene(mainPane);
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();
    }

    private void showDialog() {
        dialog = new Dialog<>();
        dialog.setTitle("Create User");
        dialog.setHeaderText("Please enter User Name and Password to create a new user.");
        dialog.setResizable(false);
        Label userNameLabel = new Label("User Name:");
        Label passwordLabel = new Label("Password:");
        TextField userNameField = new TextField();
        PasswordField passwordField = new PasswordField();
        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(20, 35, 20, 35));
        grid.add(userNameLabel, 1, 1);
        grid.add(userNameField, 2, 1);
        grid.add(passwordLabel, 1, 2);
        grid.add(passwordField, 2, 2);
        dialog.getDialogPane().setContent(grid);
        dialog.getDialogPane().getButtonTypes().add(ButtonType.OK);
        Button okButton = (Button) dialog.getDialogPane().lookupButton(ButtonType.OK);
        okButton.addEventFilter(ActionEvent.ACTION, event -> {
            createUser(userNameField.getText().trim(), passwordField.getText());
            event.consume();
        });
        dialog.getDialogPane().getButtonTypes().add(ButtonType.CANCEL);
        dialog.showAndWait();
    }

    private void createUser(String userName, String password) {
        dialog.getDialogPane().setDisable(true);
        dialog.getDialogPane().setCursor(Cursor.WAIT); // does not work!
        Task<Boolean> task = new Task<Boolean>() {
            @Override
            public Boolean call() {
                try {
                    Thread.sleep(2000); // simulate processing
                } catch (InterruptedException exception) {
                }
                return Boolean.TRUE;
            }
        };
        task.setOnSucceeded(e -> {
            Boolean success = task.getValue();
            dialog.getDialogPane().setDisable(false);
            dialog.getDialogPane().setCursor(Cursor.DEFAULT);
            if (success.booleanValue()) {
                dialog.close(); // does not seem to close before alert is shown
                Alert alert = new Alert(AlertType.INFORMATION);
                alert.setTitle("Create User Successful");
                alert.setHeaderText("The user is successfully created.");
                alert.showAndWait();
            } else {
                Alert alert = new Alert(AlertType.ERROR);
                alert.setTitle("Create User Error");
                alert.setHeaderText("Unable to create user.");
                alert.showAndWait();
            }
        });
        new Thread(task).start();
    }

    public static void main(String[] arguments) {
        Application.launch(arguments);
    }

}

以下是User类的代码：

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class User {

    private StringProperty index;

    private StringProperty userName;

    private StringProperty role;

    public void setIndex(String index) {
        indexProperty().set(index);
    }

    public String getIndex() {
        return indexProperty().get();
    }

    public StringProperty indexProperty() {
        if (index == null) {
            index = new SimpleStringProperty(this, "index");
        }
        return index;
    }

    public void setUserName(String userName) {
        userNameProperty().set(userName);
    }

    public String getUserName() {
        return userNameProperty().get();
    }

    public StringProperty userNameProperty() {
        if (userName == null) {
            userName = new SimpleStringProperty(this, "userName");
        }
        return userName;
    }

    public void setRole(String role) {
        roleProperty().set(role);
    }

    public String getRole() {
        return roleProperty().get();
    }

    public StringProperty roleProperty() {
        if (role == null) {
            role = new SimpleStringProperty(this, "role");
        }
        return role;
    }

}

编辑：

（1）对于光标问题，我只需要改变这一行：

dialog.getDialogPane().setCursor(Cursor.WAIT);

为：

dialog.getDialogPane().getScene().setCursor(Cursor.WAIT)

（2）对于第二个问题，我只需要改变这一行：

dialog.close();

为：

Platform.runLater(() -> {
    dialog.close();
});

解决方案：

import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Dialog;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Demo extends Application {

    private Dialog<String> dialog;
    private Button createUserButton = new Button("Create User");

    @Override
    public void start(Stage primaryStage) throws Exception {
        Text usersLabel = new Text("Current Users:");
        TableColumn<User, String> indexColumn = new TableColumn<User, String>("No.");
        indexColumn.setMaxWidth(1f * Integer.MAX_VALUE * 10);
        indexColumn.setCellValueFactory(p -> p.getValue().indexProperty());
        TableColumn<User, String> userNameColumn = new TableColumn<User, String>("User Name");
        userNameColumn.setMaxWidth(1f * Integer.MAX_VALUE * 60);
        userNameColumn.setCellValueFactory(p -> p.getValue().userNameProperty());
        TableColumn<User, String> roleColumn = new TableColumn<User, String>("Role");
        roleColumn.setMaxWidth(1f * Integer.MAX_VALUE * 30);
        roleColumn.setCellValueFactory(p -> p.getValue().roleProperty());
        TableView<User> tableView = new TableView<User>();
        tableView.getColumns().add(indexColumn);
        tableView.getColumns().add(userNameColumn);
        tableView.getColumns().add(roleColumn);
        tableView.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
        Text dummyLabel = new Text("");
        createUserButton.setOnAction(event -> showDialog());
        VBox leftPane = new VBox(5);
        leftPane.getChildren().addAll(usersLabel, tableView);
        VBox rightPane = new VBox(20);
        rightPane.setFillWidth(true);
        rightPane.getChildren().addAll(dummyLabel, createUserButton);
        GridPane mainPane = new GridPane();
        mainPane.setPadding(new Insets(10, 0, 0, 10));
        mainPane.setHgap(20);
        mainPane.add(leftPane, 0, 0);
        mainPane.add(rightPane, 1, 0);
        Scene scene = new Scene(mainPane);
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();
    }

    private void showDialog() {
        dialog = new Dialog<>();
        dialog.setTitle("Create User");
        dialog.setHeaderText("Please enter User Name and Password to create a new user.");
        dialog.setResizable(false);
        Label userNameLabel = new Label("User Name:");
        Label passwordLabel = new Label("Password:");
        TextField userNameField = new TextField();
        PasswordField passwordField = new PasswordField();
        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);
        grid.setPadding(new Insets(20, 35, 20, 35));
        grid.add(userNameLabel, 1, 1);
        grid.add(userNameField, 2, 1);
        grid.add(passwordLabel, 1, 2);
        grid.add(passwordField, 2, 2);
        dialog.getDialogPane().setContent(grid);
        dialog.getDialogPane().getButtonTypes().add(ButtonType.OK);
        Button okButton = (Button) dialog.getDialogPane().lookupButton(ButtonType.OK);
        okButton.addEventFilter(ActionEvent.ACTION, event -> {
            createUser(userNameField.getText().trim(), passwordField.getText());
            event.consume();
        });
        dialog.getDialogPane().getButtonTypes().add(ButtonType.CANCEL);
        dialog.showAndWait();
    }

    private void createUser(String userName, String password) {
        dialog.getDialogPane().setDisable(true);
        dialog.getDialogPane().getScene().setCursor(Cursor.WAIT); // Changed
        Task<Boolean> task = new Task<Boolean>() {
            @Override
            public Boolean call() {
                try {
                    Thread.sleep(2000); // simulate processing
                } catch (InterruptedException exception) {
                }
                return Boolean.TRUE;
            }
        };
        task.setOnSucceeded(e -> {
            Boolean success = task.getValue();
            dialog.getDialogPane().setDisable(false);
            dialog.getDialogPane().getScene().setCursor(Cursor.DEFAULT); // Changed
            if (success.booleanValue()) {
                Platform.runLater(() -> { // Added
                    dialog.close();
                });                       // Added
                Alert alert = new Alert(AlertType.INFORMATION);
                alert.setTitle("Create User Successful");
                alert.setHeaderText("The user is successfully created.");
                alert.showAndWait();
            } else {
                Alert alert = new Alert(AlertType.ERROR);
                alert.setTitle("Create User Error");
                alert.setHeaderText("Unable to create user.");
                alert.showAndWait();
            }
        });
        new Thread(task).start();
    }

    public static void main(String[] arguments) {
        Application.launch(arguments);
    }

}

Answer 1

你的问题来自这行代码：

dialog.getDialogPane().setDisable(true);

不要停用DialogPane，只需停用Node上的Pane。

您似乎提出了多个问题。这会回答您的Cursor问题。

Answer 2

您仍然可以停用DialogPane。但是，我认为通过禁用DialogPane，您也可以防止它受到重击测试，从而阻止接收任何鼠标事件。

但您可以使用dialog.getDialogPane().setDisable(true); dialog.getDialogPane().getScene().setCursor(Cursor.WAIT);的任何父节点（本例中为场景节点）：

toString()

JavaFX对话框的问题

2 个答案: