Question

我有一个工作示例，用于在JavaFX FXML中的窗格上定义ContextMenu，但我不确定它是否是最佳的。目前，只有JavaFX标准控件（例如Button，TextField）定义用于指定弹出ContextMenu的属性。然而，我想在一个窗格中出现一个弹出菜单，在我的例子中是一个VBox。

我采用扩展VBox的方法来支持上下文菜单。这是一个'笨重'的解决方案，但有效。有更好的方法吗？我错过了一些基本概念吗？

这是我的解决方案......

FXML：

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import custommenu.view.ContextMenuPane?>

<AnchorPane xmlns:fx="http://javafx.com/fxml" fx:controller="custommenu.controller.CustomMenuController">
    <children>
        <VBox fx:id="vbox" onContextMenuRequested="#showMenu"
            onMousePressed="#hideMenu" prefHeight="200" prefWidth="200">
        </VBox>
        <ContextMenuPane>
            <contextMenu>
                <ContextMenu fx:id="menu">
                    <items>
                        <MenuItem text="add" onAction="#add" />
                    </items>
                </ContextMenu>
            </contextMenu>
        </ContextMenuPane>
    </children>
</AnchorPane>

... CustomMenuPane

package custommenu.view;

import javafx.scene.control.ContextMenu;
import javafx.scene.layout.Pane;

public class ContextMenuPane extends Pane {

    private ContextMenu contextMenu;

    public void setContextMenu(ContextMenu contextMenu) {
        this.contextMenu = contextMenu;
    }

    public ContextMenu getContextMenu() {
        return contextMenu;
    }

}

...控制器

package custommenu.controller;

import javafx.fxml.FXML;
import javafx.scene.control.ContextMenu;
import javafx.scene.input.ContextMenuEvent;
import javafx.scene.layout.VBox;

public class CustomMenuController {

    @FXML private VBox vbox;
    @FXML private ContextMenu menu;

    @FXML public void add() {
        System.out.println("add");
    }

    @FXML
    public void showMenu(ContextMenuEvent event) {
        System.out.println("showMenu");

        menu.show(vbox, event.getScreenX(), event.getScreenY());
        event.consume();
    }

    @FXML public void hideMenu() {
        menu.hide();
    }
}

主要应用......

package custommenu;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class CustomMenuApplication extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Pane myPane = (Pane)FXMLLoader.load(getClass().getResource("/custommenu/custom_menu_main.fxml"));
        Scene scene = new Scene(myPane);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

Answer 1

试图在Popup中做到这一点？捕获MouseEvent检查MouseButton.SECONDARY并在弹出窗口中显示您的VBox。

private void showContextMenu() // showContextMenu(MouseEvent event)
{
    Popup popup = new Popup();

    VBox content = new VBox();
    Button b = new Button("Click Me!");
    b.setOnAction(new EventHandler<ActionEvent>() { });
    content.getChildren().addAll(b);

    popup.getContent().add(content);
    popup.setX(0); // or get mouse event x and y
    popup.setY(0); // event.getY()
    popup.setAutoHide(true);
    popup.show(your popup owner);
}

Answer 2

在这个例子中，有一个按钮，当点击左/右时有上下文菜单当你点击除按钮以外的其他区域它会打开弹出窗口它会隐藏弹出上下文菜单

public class Main扩展Application {

public static void main(String[] args) {
    launch(args);
  }
  @Override
  public void start(Stage stage) {
    Scene scene = new Scene(new Group(), 450, 250);
    Button notification = new Button();

    MenuItem item1 = new MenuItem("About");
    item1.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("About");
      }
    });
    MenuItem item2 = new MenuItem("Preferences");
    item2.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("Preferences");
      }
    });

    MenuItem item3 = new MenuItem("About");
    item1.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("About");
      }
    });
    MenuItem item4 = new MenuItem("Preferences");
    item2.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("Preferences");
      }
    });
    MenuItem item5 = new MenuItem("About");
    item1.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("About");
      }
    });
    MenuItem item6 = new MenuItem("Preferences");
    item2.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("Preferences");
      }
    });

    MenuItem item7 = new MenuItem("About");
    item1.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("About");
      }
    });
    MenuItem item8 = new MenuItem("Preferences");
    item2.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent e) {
        System.out.println("Preferences");
      }
    });
    final ContextMenu contextMenu = new ContextMenu(item1, item2,item3, item4,item5, item6,item7, item8);
    contextMenu.setMaxSize(50, 50);

    contextMenu.setOnShowing(new EventHandler<WindowEvent>() {
      public void handle(WindowEvent e) {
        System.out.println("showing");
      }
    });
    contextMenu.setOnShown(new EventHandler<WindowEvent>() {
      public void handle(WindowEvent e) {
        System.out.println("shown");
      }
    });

   // contextMenu.hide();


    notification.setContextMenu(contextMenu);
    GridPane grid = new GridPane();
    grid.setVgap(4);
    grid.setHgap(10);
    grid.setPadding(new Insets(5, 5, 5, 5));
    grid.add(new Label("To: "), 0, 0);
    grid.add(notification, 1, 0);

    Group root = (Group) scene.getRoot();
    root.getChildren().add(grid);
    stage.setScene(scene);
    stage.show();
    notification.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent me)->{
        if(me.getButton()==MouseButton.PRIMARY ){
            System.out.println("Mouse Left Pressed");
            System.out.println(notification.getScaleX());
            System.out.println(notification.getScaleY());
            System.out.println(me.getScreenX());
            System.out.println(me.getScreenY());
            contextMenu.show(notification,me.getScreenX(),me.getScreenY());
        }else{
            contextMenu.hide();
        }
    });
  }

}

使用FXML在窗格内创建ContextMenu

2 个答案: