Question

我尝试构建文本对话框，用户可以在其中输入事件名称，事件大小和选定的场地。

我的问题是如何收集输入;这是我到目前为止所做的：

eventName = new TextField();
eventSize = new TextField();
ObservableList<Venue> options = 
            FXCollections.observableArrayList(model.getVenuesList());
VeunueList = new ComboBox<Venue>(options);

我创建了一个封装所有输入的类：

public class MyResult {
    String eventname;
    String eventsize;
    Venue venue;
}

我将变量定义为类Myresult的对象：

private Dialog<MyResult> dialog ;
private Optional<MyResult> EventInput;

问题是如何在结果转换器中写入return语句;它给了我错误：

dialog.setResultConverter(dialogButton -> {
        if (dialogButton == submit) {
            return new MyResult(eventName.getText(),eventSize.getText(),VeunueList.getValue())
        }
        return null;
    });

    EventInput = dialog.showAndWait();

Answer 1

目前尚不清楚你的片段出错的地方，但是对setResultConverter()的调用来说正确的类型有时是有问题的。以下示例说明了Dialog收集来自TextField，DatePicker和ComboBox<Venue>的输入。在ComboBox<Venue>中，Venue的选择来自enum，相应的ComboBox模型是使用枚举的隐式values()方法构建的。 resultConverter属性Callback返回Results的新实例，其中包含各种视图组件的当前值。 Optional<Results>显示了这些值ifPresent()。可以在here和教程JavaFX improvements in Java SE 8u40.

中找到一些相关示例

控制台：Name 2017-05-24 Elsewhere

import java.time.LocalDate;
import java.util.Optional;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.ButtonType;
import javafx.scene.control.ComboBox;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Dialog;
import javafx.scene.control.DialogPane;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * @see http://stackoverflow.com/q/44147595/230513
 * @see http://www.javaworld.com/article/2991463/
 */
public class DialogTest extends Application {

    @Override
    public void start(Stage primaryStage) {
        Dialog<Results> dialog = new Dialog<>();
        dialog.setTitle("Dialog Test");
        dialog.setHeaderText("Please specify…");
        DialogPane dialogPane = dialog.getDialogPane();
        dialogPane.getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);
        TextField textField = new TextField("Name");
        DatePicker datePicker = new DatePicker(LocalDate.now());
        ObservableList<Venue> options =
            FXCollections.observableArrayList(Venue.values());
        ComboBox<Venue> comboBox = new ComboBox<>(options);
        comboBox.getSelectionModel().selectFirst();
        dialogPane.setContent(new VBox(8, textField, datePicker, comboBox));
        Platform.runLater(textField::requestFocus);
        dialog.setResultConverter((ButtonType button) -> {
            if (button == ButtonType.OK) {
                return new Results(textField.getText(),
                    datePicker.getValue(), comboBox.getValue());
            }
            return null;
        });
        Optional<Results> optionalResult = dialog.showAndWait();
        optionalResult.ifPresent((Results results) -> {
            System.out.println(
                results.text + " " + results.date + " " + results.venue);
        });
    }

    private static enum Venue {Here, There, Elsewhere}

    private static class Results {

        String text;
        LocalDate date;
        Venue venue;

        public Results(String name, LocalDate date, Venue venue) {
            this.text = name;
            this.date = date;
            this.venue = venue;
        }
    }

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

在JavaFX对话框

1 个答案: