JavaFX ComboBox的选中事项

参考1：https://blog.csdn.net/mexel310/article/details/37909205

参考2：https://blog.csdn.net/maosijunzi/article/details/43486441

目的：通过选择下拉框中的字体，更新字符串“JavaFX”的显示字体。

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.Tooltip;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.text.Font;
import javafx.stage.Stage;

public class MyJavaFX extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        // Create a pane to hold the label and the combo box
        BorderPane pane = new BorderPane();
        
        // label
        Label label = new Label();
        label.setText("JavaFX");
        
        // combo box
        ComboBox<Object> comboBox = new ComboBox<>();
        comboBox.setTooltip(new Tooltip("Select the language"));
        comboBox.setItems(FXCollections.observableArrayList(Font.getFamilies()));
        comboBox.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue observable, Object oldValue, Object newValue) {
                System.out.println(newValue.toString());
                label.setFont(Font.font(newValue.toString()));
                
            }
        });
        
        // Place combo box in the top of the pane, and label in the bottom of the pane 
        pane.setTop(new CustomPane(comboBox));
        pane.setBottom(new CustomPane(label));
        
        Scene scene = new Scene(pane);
        primaryStage.setTitle("Font Demo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

class CustomPane extends StackPane {
    public CustomPane(Node node) {
        getChildren().add(node);
        setStyle("-fx-border-color: green;");
        setPadding(new Insets(20, 20, 20, 20));
    }
}

运行效果：