JavaFX | ContextMenu with examples

ContextMenu is a part of the JavaFX library. ContextMenu can be associated with controls such as labels, textfield etc. The context menu is activated on right clicking over the associated controls. It shows a popup containing several menuitems or sub menu.

The Constructors of the class are:

1. ContextMenu(): creates a new empty context menu.
2. ContextMenu(MenuItem… i): creates a context menu that contains the menuitems.

Commonly used methods:

method	explanation
getItems()	returns the items of the context menu
getOnAction()	returns the value of the property OnAction
hide()	hides the context menu
setOnAction(EventHandler v)	sets the value of the property onAction
show(Node a, double X, double Y)	displays the context menu at a specified position of the screen

Below programs illustrate the use of ContextMenu:

1. Program to create a context menu and add it to label: A ContextMenu will be created by name ‘contextMenu’ and 3 menuitems: menuItem1, menuItem2, menuItem3 will be added to the menu contextMenu and the menu contextMenu will be associated with a label ‘label’. The label will be created inside a scene, which in turn will be hosted inside a stage. The function setTitle() is used to provide title to the stage. Then a VBox is created, on which addChildren() method is called to attach the menubar inside the scene. Finally, the show() method is called to display the final results.
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   // Program to create a context menu and add it to label import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.collections.*; import javafx.stage.Stage; import javafx.scene.text.Text.*; import javafx.scene.paint.*; import javafx.scene.text.*; public class contextMenu_1 extends Application {     // labels     Label l;        // launch the application     public void start(Stage stage)     {         // set title for the stage         stage.setTitle("creating contextMenu ");            // create a label         Label label1 = new Label("This is a ContextMenu example ");            // create a menu         ContextMenu contextMenu = new ContextMenu();            // create menuitems         MenuItem menuItem1 = new MenuItem("menu item 1");         MenuItem menuItem2 = new MenuItem("menu item 2");         MenuItem menuItem3 = new MenuItem("menu item 3");            // add menu items to menu         contextMenu.getItems().add(menuItem1);         contextMenu.getItems().add(menuItem2);         contextMenu.getItems().add(menuItem3);            // create a tilepane         TilePane tilePane = new TilePane(label1);            // setContextMenu to label         label1.setContextMenu(contextMenu);            // create a scene         Scene sc = new Scene(tilePane, 200, 200);            // set the scene         stage.setScene(sc);            stage.show();     }        public static void main(String args[])     {         // launch the application         launch(args);     } }

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   Output:
   

2. Program to create a context menu and add it to label and associate the context menu with window event listener: A Contextmenu will be created by name contextMenu and 3 menuitems menuItem1, menuItem2, menuItem3 will be added to the menu contextMenu and the contextMenu will be associated with a label l. The label will be created inside a scene, which in turn will be hosted inside a stage. The function setTitle() is used to provide title to the stage. Then a VBox is created, on which addChildren() method is called to attach the menubar inside the scene. Finally, the show() method is called to display the final results. A Window event will be created that will handle the window events of the context menu and will display the state of the context menu by a Label ‘label’. The window event will be associated with the label using setOnHiding() and setOnShowing() functions.
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   // Program to create a context menu and add it to label // and associate the context menu with window event listener import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.WindowEvent; import javafx.event.EventHandler; import javafx.collections.*; import javafx.stage.Stage; import javafx.scene.text.Text.*; import javafx.scene.paint.*; import javafx.scene.text.*; public class contextMenu extends Application {     // labels     Label label;        // launch the application     public void start(Stage stage)     {         // set title for the stage         stage.setTitle("creating contextMenu ");            // create a label         Label label1 = new Label("This is a ContextMenu example ");            // create a menu         ContextMenu contextMenu = new ContextMenu();            // create menuitems         MenuItem menuItem1 = new MenuItem("menu item 1");         MenuItem menuItem2 = new MenuItem("menu item 2");         MenuItem menuItem3 = new MenuItem("menu item 3");            // add menu items to menu         contextMenu.getItems().add(menuItem1);         contextMenu.getItems().add(menuItem2);         contextMenu.getItems().add(menuItem3);            // label to display events         Label label = new Label("context menu hidden");            // create window event         EventHandler<WindowEvent> event = new EventHandler<WindowEvent>() {             public void handle(WindowEvent e)             {                 if (contextMenu.isShowing())                     label.setText("context menu showing");                 else                     label.setText("context menu hidden");             }         };            // add event         contextMenu.setOnShowing(event);         contextMenu.setOnHiding(event);            // create a tilepane         TilePane tilePane = new TilePane(label1);            tilePane.getChildren().add(label);            // setContextMenu to label         label.setContextMenu(contextMenu);            // create a scene         Scene sc = new Scene(tilePane, 200, 200);            // set the scene         stage.setScene(sc);            stage.show();     }        public static void main(String args[])     {         // launch the application         launch(args);     } }

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   Output:
   

   

Note : The above programs might not run in an online compiler please use an offline IDE.

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/ContextMenu.html

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