JavaFX UI组件——Menu

详解：https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/menu_controls.htm

代码示例：

 

import java.util.AbstractMap.SimpleEntry;
import java.util.Map.Entry;
import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.effect.DropShadow;
import javafx.scene.effect.Effect;
import javafx.scene.effect.Glow;
import javafx.scene.effect.SepiaTone;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.*;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;

public class MenuSample extends Application {

    final PageData[] pages = new PageData[] {
        new PageData("Apple",
            "The apple is the pomaceous fruit of the apple tree, species Malus "
            + "domestica in the rose family (Rosaceae). It is one of the most "
            + "widely cultivated tree fruits, and the most widely known of "
            + "the many members of genus Malus that are used by humans. "
            + "The tree originated in Western Asia, where its wild ancestor, "
            + "the Alma, is still found today.",
            "Malus domestica"),
        new PageData("Hawthorn",
            "The hawthorn is a large genus of shrubs and trees in the rose family,"
            + "Rosaceae, native to temperate regions of the Northern Hemisphere "
            + "in Europe, Asia and North America. The name hawthorn was "
            + "originally applied to the species native to northern Europe, "
            + "especially the Common Hawthorn C. monogyna, and the unmodified "
            + "name is often so used in Britain and Ireland.",
            "Crataegus monogyna"),
        new PageData("Ivy",
            "The ivy is a flowering plant in the grape family (Vitaceae) native to "
            + " eastern Asia in Japan, Korea, and northern and eastern China. "
            + "It is a deciduous woody vine growing to 30 m tall or more given "
            + "suitable support,  attaching itself by means of numerous small "
            + "branched tendrils tipped with sticky disks.",
            "Parthenocissus tricuspidata"),
        new PageData("Quince",
            "The quince is the sole member of the genus Cydonia and is native to "
            + "warm-temperate southwest Asia in the Caucasus region. The "
            + "immature fruit is green with dense grey-white pubescence, most "
            + "of which rubs off before maturity in late autumn when the fruit "
            + "changes color to yellow with hard, strongly perfumed flesh.",
            "Cydonia oblonga")
    };

    final String[] viewOptions = new String[] {
        "Title", 
        "Binomial name", 
        "Picture", 
        "Description"
    };

    final Entry[] effects = new Entry[] {
        new SimpleEntry<>("Sepia Tone", new SepiaTone()),
        new SimpleEntry<>("Glow", new Glow()),
        new SimpleEntry<>("Shadow", new DropShadow())
    };

    final ImageView pic = new ImageView();
    final Label name = new Label();
    final Label binName = new Label();
    final Label description = new Label();
    private int currentIndex = -1;

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

    @Override
    public void start(Stage stage) {
        stage.setTitle("Menu Sample");
        Scene scene = new Scene(new VBox(), 400, 350);
        scene.setFill(Color.OLDLACE);

        name.setFont(new Font("Verdana Bold", 22));
        binName.setFont(new Font("Arial Italic", 10));
        pic.setFitHeight(150);
        pic.setPreserveRatio(true);
        description.setWrapText(true);
        description.setTextAlignment(TextAlignment.JUSTIFY);

        shuffle();

        MenuBar menuBar = new MenuBar();

        // --- Graphical elements
        final VBox vbox = new VBox();
        vbox.setAlignment(Pos.CENTER);
        vbox.setSpacing(10);        
        vbox.setPadding(new Insets(0, 10, 0, 10));
        vbox.getChildren().addAll(name, binName, pic, description);

        // --- Menu File
        Menu menuFile = new Menu("File");
        MenuItem add = new MenuItem("Shuffle",
            new ImageView(new Image("menusample/new.png")));
        add.setOnAction((ActionEvent t) -> {
            shuffle();
            vbox.setVisible(true);
        });

        MenuItem clear = new MenuItem("Clear");
        clear.setAccelerator(KeyCombination.keyCombination("Ctrl+X"));
        clear.setOnAction((ActionEvent t) -> {
            vbox.setVisible(false);
        });

        MenuItem exit = new MenuItem("Exit");
        exit.setOnAction((ActionEvent t) -> {
            System.exit(0);
        });

        menuFile.getItems().addAll(add, clear, new SeparatorMenuItem(), exit);

        // --- Menu Edit
        Menu menuEdit = new Menu("Edit");
        Menu menuEffect = new Menu("Picture Effect");

        final ToggleGroup groupEffect = new ToggleGroup();
        for (Entry effect : effects) {
            RadioMenuItem itemEffect = new RadioMenuItem(effect.getKey());
            itemEffect.setUserData(effect.getValue());
            itemEffect.setToggleGroup(groupEffect);
            menuEffect.getItems().add(itemEffect);
        }

        final MenuItem noEffects = new MenuItem("No Effects");
        noEffects.setDisable(true);
        noEffects.setOnAction((ActionEvent t) -> {
            pic.setEffect(null);
            groupEffect.getSelectedToggle().setSelected(false);
            noEffects.setDisable(true);
        });
        
        groupEffect.selectedToggleProperty().addListener(
            (ObservableValue ov, Toggle old_toggle, 
            Toggle new_toggle) -> {
                if (groupEffect.getSelectedToggle() != null) {
                    Effect effect = 
                            (Effect) groupEffect.getSelectedToggle().getUserData();
                    pic.setEffect(effect);
                    noEffects.setDisable(false);
                } else {
                    noEffects.setDisable(true);
                }
        });
        
        menuEdit.getItems().addAll(menuEffect, noEffects);

        // --- Menu View
        Menu menuView = new Menu("View");
        CheckMenuItem titleView = createMenuItem ("Title", name);
        CheckMenuItem binNameView = createMenuItem ("Binomial name", binName);
        CheckMenuItem picView = createMenuItem ("Picture", pic);
        CheckMenuItem descriptionView = createMenuItem (
            "Decsription", description);

        menuView.getItems().addAll(titleView, binNameView, picView,
            descriptionView);
        menuBar.getMenus().addAll(menuFile, menuEdit, menuView);

        // --- Context Menu
        final ContextMenu cm = new ContextMenu();
        MenuItem cmItem1 = new MenuItem("Copy Image");
        cmItem1.setOnAction((ActionEvent e) -> {
            Clipboard clipboard = Clipboard.getSystemClipboard();
            ClipboardContent content = new ClipboardContent();
            content.putImage(pic.getImage());
            clipboard.setContent(content);
        });

        cm.getItems().add(cmItem1);
        pic.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent e) -> {
            if (e.getButton() == MouseButton.SECONDARY)
                cm.show(pic, e.getScreenX(), e.getScreenY());
        });

        ((VBox) scene.getRoot()).getChildren().addAll(menuBar, vbox);

        stage.setScene(scene);
        stage.show();
    }

    private void shuffle() {
        int i = currentIndex;
        while (i == currentIndex) {
            i = (int) (Math.random() * pages.length);
        }
        pic.setImage(pages[i].image);
        name.setText(pages[i].name);
        binName.setText("(" + pages[i].binNames + ")");
        description.setText(pages[i].description);
        currentIndex = i;
    }

    private static CheckMenuItem createMenuItem (String title, final Node node){
        CheckMenuItem cmi = new CheckMenuItem(title);
        cmi.setSelected(true);
        cmi.selectedProperty().addListener(
            (ObservableValue ov, Boolean old_val, 
            Boolean new_val) -> {
                node.setVisible(new_val);
        });              
        return cmi;
    }

    private class PageData {
        public String name;
        public String description;
        public String binNames;
        public Image image;
        public PageData(String name, String description, String binNames) {
            this.name = name;
            this.description = description;
            this.binNames = binNames;
            image = new Image(getClass().getResourceAsStream(name + ".jpg"));
        }
    }
}