JavaFX: ChoiceBox

ChoiceBox class defines a choice box control. Using choice box control, you can define list of predefined choices from which user may select.

 

Can a user select the item something other than the predefined list?

Yes, it is possible for the developer to specify the selected item to be something other than what is available in the predefined list.

 

ChoiceBox class provides following constructors to define an instance of ChoiceBox.

 

public ChoiceBox()

Create a new ChoiceBox which has an empty list of items.

 

public ChoiceBox(ObservableList<T> items)

Create a new ChoiceBox with the given set of items. Since it is observable, the content of this list may change over time and the ChoiceBox will be updated accordingly.

 

Find the below working application.

 

ChoiceBoxDemo.java 

package com.sample.app.widgets;

import javafx.application.Application;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.effect.DropShadow;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.stage.Stage;

public class ChoiceBoxDemo extends Application {

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

	}

	@Override
	public void start(Stage primaryStage) throws Exception {
		
		DropShadow dropShadow = new DropShadow();
		dropShadow.setOffsetX(5);
		dropShadow.setOffsetY(5);
		dropShadow.setColor(Color.GRAY);

		ObservableList<Object> observableList = FXCollections.observableArrayList("Cricket", "Trekking", "Blogging",
				"Chess");

		HBox hBox1 = new HBox();
		Label label1 = new Label("Please select your hobby");
		label1.setFont(Font.font("Verdana", FontPosture.REGULAR, 30));
		hBox1.getChildren().add(label1);
		hBox1.setPadding(new Insets(20, 20, 20, 20));

		Label selectedHobbies = new Label("");
		selectedHobbies.setFont(Font.font("Verdana", FontPosture.REGULAR, 30));
		selectedHobbies.setTextFill(Color.BLUE);
		selectedHobbies.setWrapText(true);
		selectedHobbies.setEffect(dropShadow);

		ChoiceBox<String> choiceBox = new ChoiceBox<>();
		choiceBox.getItems().addAll("Cricket", "Trekking", "Blogging", "Chess");
		choiceBox.getSelectionModel().selectFirst();

		choiceBox.getSelectionModel().selectedIndexProperty()
				.addListener((ObservableValue<? extends Number> observable, Number oldValue, Number newValue) -> {
					String result = null;
					if ((int) oldValue == -1) {
						result = "Selection changed form none to " + observableList.get((int) newValue);
						selectedHobbies.setText(result);
					} else {
						result = "Selection changed form " + observableList.get((int) oldValue) + " to "
								+ observableList.get((int) newValue);
						selectedHobbies.setText(result);
					}

				});

		HBox hBox2 = new HBox();
		hBox2.setSpacing(10);
		hBox2.setPadding(new Insets(20, 20, 20, 20));
		hBox2.getChildren().addAll(choiceBox);

		HBox hBox3 = new HBox();
		hBox3.setSpacing(10);
		hBox3.setPadding(new Insets(20, 20, 20, 20));
		hBox3.getChildren().addAll(selectedHobbies);

		VBox vBox = new VBox();
		vBox.getChildren().addAll(hBox1, hBox2, hBox3);
		vBox.setEffect(dropShadow);
		vBox.setStyle("-fx-background-color:white");

		Scene scene = new Scene(vBox, 500, 500, Color.WHITE);

		primaryStage.setTitle("Button Demo 1");
		primaryStage.setScene(scene);
		primaryStage.show();
	}

}

 

Output

 

Select your hobby and you can observe the same is reflected in bottom of the window.

 

 

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