在JPanel中添加JavaFX PieChart

Question

private void add_pie_chart(JPanel panel)
    {
    JFXPanel dataPanel = new JFXPanel();
    
    PieChart pieChart = new PieChart();

    ObservableList<PieChart.Data> data= FXCollections.observableArrayList(
            new PieChart.Data("test1", 25),
            new PieChart.Data("test 2", 25),
            new PieChart.Data("test 3", 25),
            new PieChart.Data("test 4", 25)
        );
    pieChart.setData(data);
    pieChart.setTitle("test");
    pieChart.setLabelsVisible(true);

    Group root = new Group();

    root.getChildren().add(pieChart);
    
    Scene scene = new Scene(root);
    dataPanel.setScene(scene);   //line X
    //not getting executing

    panel.add(dataPanel, BorderLayout.CENTER);
    panel.setVisible(true);

    }

我不知道为什么会发生这种情况。Plz帮助..

任何帮助都很感激。提前谢谢...

Answer 1

Swing和JavaFX都是单线程UI工具包，每个工具包都有自己的线程用于呈现UI和处理用户事件。修改Swing组件和创建Swing窗口（例如JFrames)必须在AWT事件调度线程上完成。修改JavaFX组件必须在FX应用程序线程上完成。

因此，当您同时使用这两个工具包时，必须小心地将适当的操作委托给适当的线程。Javadocs forJFXPanel有更多细节。

下面是一个完整的示例，其中包括对代码的轻微修改，并展示了如何将代码的不同部分移动到适当的线程中：

package org.jamesd.examples.piechartswing;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;


public class App  {

    public void startUI() {
        JFrame frame = new JFrame();
        JFXPanel fxPanel = new JFXPanel();
        Platform.runLater(() -> createChart(fxPanel));
        
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add(fxPanel, BorderLayout.CENTER);
        
        frame.add(panel);
        frame.setSize(600,  600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    
    private void createChart(JFXPanel dataPanel) {
        PieChart pieChart = new PieChart();

        ObservableList<PieChart.Data> data= FXCollections.observableArrayList(
                new PieChart.Data("test1", 25),
                new PieChart.Data("test 2", 25),
                new PieChart.Data("test 3", 25),
                new PieChart.Data("test 4", 25)
            );
        pieChart.setData(data);
        pieChart.setTitle("test");
        pieChart.setLabelsVisible(true);

        Group root = new Group();

        root.getChildren().add(pieChart);
        
        Scene scene = new Scene(root);
        dataPanel.setScene(scene); 
    }

    public static void main(String[] args) {
        App app = new App();
        SwingUtilities.invokeLater(app::startUI);
    }

}

module org.jamesd.examples.piechartswing {
    requires javafx.controls;
    requires java.desktop ;
    requires javafx.swing ;
    exports org.jamesd.examples.piechartswing;
}