JavaFX | Popup Class

Popup class is a part of JavaFX. Popup class creates a popup with no content, a null fill and is transparent. Popup class is used to display a notification, buttons, or a drop-down menu and so forth. The popup has no decorations. It essentially acts as a specialized scene/window which has no decorations.

Constructor of the class:

• Popup(): Creates an object of Popup class.

Commonly Used Methods:

Below programs illustrate the use of Popup class:

1. Java program to create a popup and add it to the stage: In this program we create a Popup named popup. The popup contains a Label named label. We also create a Button named button and add event handler to it and then display the popup if it is hidden and hide it if it is already visible. The button is added to the TilePane and the TilePane is added to the scene, and the scene is added to the stage. The show function is called to display the results. The background color of the label is set using the setStyle() function, and the label size is set using setMinHeight(), setMinWidth() function. The hide() and show() function is used to hide or show the popup.

   
   

   
   
   

   // Java program to create a popup and  // add it to the stage import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.control.Label; import javafx.stage.Stage; import javafx.stage.Popup;     public class Popup_1 extends Application {         // launch the application     public void start(Stage stage)     {             // set title for the stage         stage.setTitle("Creating popup");             // create a button         Button button = new Button("button");             // create a tile pane         TilePane tilepane = new TilePane();             // create a label         Label label = new Label("This is a Popup");             // create a popup         Popup popup = new Popup();             // set background         label.setStyle(" -fx-background-color: white;");             // add the label         popup.getContent().add(label);             // set size of label         label.setMinWidth(80);         label.setMinHeight(50);             // action event         EventHandler<ActionEvent> event =          new EventHandler<ActionEvent>() {                 public void handle(ActionEvent e)             {                 if (!popup.isShowing())                     popup.show(stage);                 else                     popup.hide();             }         };             // when button is pressed         button.setOnAction(event);             // add button         tilepane.getChildren().add(button);             // create a scene         Scene scene = new Scene(tilepane, 200, 200);             // set the scene         stage.setScene(scene);             stage.show();     }         // Main Method     public static void main(String args[])     {             // launch the application         launch(args);     } }

   Output:
2. Java Program to create a popup and add it to the stage and make the popup hide automatically when it loses focus using the setAutoHide() function: In this program we create a Popup named popup. The popup contains a Label named label. We also create a Button named button and add event handler to it, to display the popup if it is hidden. The button is added to the TilePane and the TilePane is added to the scene, and the scene is added to the stage. The show function is called to display the results. The popup will automatically hide when it loses focus, we will apply this feature to the popup using the setAutoHide() function.The background color of the label is set using the setStyle() function, and the label size is set using setMinHeight(), setMinWidth() function. The hide() and show() function is used to hide or show the popup.

   
   

   
   
   

   // Java Program to create a popup and add // it to the stage and make the popup hide // automatically when it loses focus using // the setAutoHide() function import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.scene.control.Label; import javafx.stage.Stage; import javafx.stage.Popup;    public class popup_2 extends Application {        // launch the application     public void start(Stage stage)     {            // set title for the stage         stage.setTitle("Creating Popup");            // create a button         Button button = new Button("popup");            // create a tile pane         TilePane tilepane = new TilePane();            // create a label         Label label = new Label("This is a Popup");            // create a popup         Popup popup = new Popup();            // set background         label.setStyle(" -fx-background-color: white;");            // add the label         popup.getContent().add(label);            // set size of label         label.setMinWidth(80);         label.setMinHeight(50);            // set auto hide         popup.setAutoHide(true);            // action event         EventHandler<ActionEvent> event =          new EventHandler<ActionEvent>() {             public void handle(ActionEvent e)             {                 if (!popup.isShowing())                     popup.show(stage);             }         };            // when button is pressed         button.setOnAction(event);            // add button         tilepane.getChildren().add(button);            // create a scene         Scene scene = new Scene(tilepane, 200, 200);            // set the scene         stage.setScene(scene);            stage.show();     }        // Main Method     public static void main(String args[])     {            // launch the application         launch(args);     } }

   Output:

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

Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/stage/Popup.html