JavaFX ContexMenu
Jakob Jenkov |
The JavaFX ContextMenu component provides a standard right click menu for JavaFX controls.
The JavaFX ContextMenu is represented by the class javafx.scene.control.ContextMenu
. You
create a ContextMenu
instance and attach it to the JavaFX control you want the ContextMenu
to be active for. Here is a screenshot of a JavaFX TextArea with a
ContextMenu
attached and shown:
Full ContextMenu Example
Here is a full JavaFX ContextMenu
example to give you a quick overview of how using
the ContextMenu
looks:
import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.layout.VBox; import javafx.stage.Stage; public class ContextMenuExample extends Application { public static void main(String[] args) { launch(args); } public void start(Stage primaryStage) { ContextMenu contextMenu = new ContextMenu(); MenuItem menuItem1 = new MenuItem("Choice 1"); MenuItem menuItem2 = new MenuItem("Choice 2"); MenuItem menuItem3 = new MenuItem("Choice 3"); menuItem3.setOnAction((event) -> { System.out.println("Choice 3 clicked!"); }); contextMenu.getItems().addAll(menuItem1,menuItem2,menuItem3); TextArea textArea = new TextArea(); textArea.setContextMenu(contextMenu); VBox vBox = new VBox(textArea); Scene scene = new Scene(vBox); primaryStage.setScene(scene); primaryStage.setTitle("JavaFX App"); primaryStage.show(); } }
Create a ContextMenu
To use a JavaFX ContextMenu
you must first create a ContextMenu
instance.
Here is an example of creating a JavaFX ContextMenu
:
ContextMenu contextMenu = new ContextMenu();
Add Menu Items to the ContextMenu
The ContextMenu
needs one or more MenuItem
instances which are displayed
in the menu. To detect which menu item was clicked, you add listeners to the MenuItem
instances. Here is an example of adding MenuItem
instances to a ContextMenu
:
ContextMenu contextMenu = new ContextMenu(); MenuItem menuItem1 = new MenuItem("Choice 1"); MenuItem menuItem2 = new MenuItem("Choice 2"); MenuItem menuItem3 = new MenuItem("Choice 3"); menuItem3.setOnAction((event) -> { System.out.println("Choice 3 clicked!"); }); contextMenu.getItems().addAll(menuItem1,menuItem2,menuItem3);
Notice how there is an onAction
listener set on the third MenuItem
,
using setOnAction()
, passing Java Lambda Expression
as listener. If this MenuItem
is clicked, the action listener is executed.
Add ContextMenu to JavaFX Control
A JavaFX ContextMenu
needs to be attached to a JavaFX control to be active. You add a
ContextMenu
to a control via the setContextMenu()
of a JavaFX control.
Here is an example of adding a JavaFX ContextMenu
to a JavaFX control:
TextArea textArea = new TextArea(); textArea.setContextMenu(contextMenu);
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Jakob Jenkov |