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JavaFX Button

JavaFX button control is represented by javafx.scene.control.Button class. A button is a component that can control the behaviour of the Application. An event is generated whenever the button gets clicked.

How to create a Button?

Button can be created by instantiating Button class. Use the following line to create button object.

Adding a Button to the scene graph

To visualize the button on the screen, we must attach it to the scene object. The following code creates a button and adds it to the scene object.

     package application;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ButtonTest extends Application {

	@Override
	public void start(Stage primaryStage) throws Exception {
		// TODO Auto-generated method stub
		
		StackPane root = new StackPane(); 
		Button btn=new Button("This is a button");
		Scene scene=new Scene(root,300,300);
		root.getChildren().add(btn);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Button Class Example");
		primaryStage.show();
		
	}
	public static void main(String[] args) {
		launch(args);
	}
}

    

Output:

Setting the Text of the Button

There are two ways of setting the text on the button.

Passing the text into the class constructor
By calling setText("text") method

Wrapping Button Text

We can wrap the text of the button into multiple lines if the text to be displayed is too long. This can be done by calling a setter method setWrapText(boolean) on the instance of Button class. Pass the boolean value true in the method wherever required.

Setting the image on the button

Button class contains a constructor which can accept graphics along with the text displayed on the button. The following code implements image on the button.

     package application;

import java.io.FileInputStream;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ButtonTest extends Application {

	@Override
	public void start(Stage primaryStage) throws Exception {
		// TODO Auto-generated method stub
		
	
		FileInputStream input=new FileInputStream("/home/w3cschoool/Desktop/JavaFX/Images/colored_label.png");
		Image image = new Image(input);
		ImageView img=new ImageView(image);
		
		StackPane root = new StackPane(); 
		Button btn=new Button("Button 1",img);
		btn.setWrapText(true);
		Scene scene=new Scene(root,300,300);
		root.getChildren().add(btn);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Button Class Example");
		primaryStage.show();
		
	}
	public static void main(String[] args) {
		launch(args);
	}
}

    

Output:

Using setGraphic() method:

Button class also provides an instance method named setGraphic(). We have to pass the image view object in this method. The following code implements setGraphic() method.

     package application;

import java.io.FileInputStream;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ButtonTest extends Application {

	@Override
	public void start(Stage primaryStage) throws Exception {
		// TODO Auto-generated method stub
		
	
		FileInputStream input=new FileInputStream("/home/w3cschoool/Desktop/JavaFX/Images/colored_label.png");
		Image image = new Image(input);
		ImageView img=new ImageView(image);
		
		StackPane root = new StackPane(); 
		Button btn=new Button();
		btn.setGraphic(img);
		btn.setWrapText(true);
		Scene scene=new Scene(root,300,300);
		root.getChildren().add(btn);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Button Class Example");
		primaryStage.show();
		
	}
	public static void main(String[] args) {
		launch(args);
	}
}

    

Output:

Button Action

Button class provides setOnAction() methodwhich is used to set the action for the button click event. An object of the anonymous class implementing the handle() method, is passed in this method as a parameter.

We can also pass lambda expressions to handle the events. The following code implements the Button event.

     package application;

import java.io.FileInputStream;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class LabelTest extends Application {

	@Override
	public void start(Stage primaryStage) throws Exception {
		// TODO Auto-generated method stub
		
	
		FileInputStream input=new FileInputStream("/home/w3cschoool/Desktop/JavaFX/Images/colored_label.png");
		Image image = new Image(input);
		ImageView img=new ImageView(image);
		
		StackPane root = new StackPane(); 
		Button btn=new Button();
		btn.setGraphic(img);
		btn.setWrapText(true);
		btn.setOnAction(new EventHandler<ActionEvent>() {
			
			@Override
			publicvoid handle(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("Button clicked");
				
			}
		} );
		
		Scene scene=new Scene(root,300,300);
		root.getChildren().add(btn);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Button Class Example");
		primaryStage.show();
		
	}
	public static void main(String[] args) {
		launch(args);
	}
}

    

Output:

Button Effects

We can apply the effects to a Button. The effects are provided by javafx.scene.effect package. The following code shows how the drop shadow effect can be applied to a button.

     package application;

import java.io.FileInputStream;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.effect.DropShadow;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ButtonTest extends Application {

	@Override
	public void start(Stage primaryStage) throws Exception {
		// TODO Auto-generated method stub
		
	
		FileInputStream input=new FileInputStream("/home/w3cschoool/Desktop/JavaFX/Images/colored_label.png");
		Image image = new Image(input);
		ImageView img=new ImageView(image);
		DropShadow shadow = new DropShadow();
		
		StackPane root = new StackPane(); 
		Button btn=new Button();
		btn.setEffect(shadow);
		btn.setGraphic(img);
		btn.setWrapText(true);
		btn.setOnAction(new EventHandler<ActionEvent>() {
			
			@Override
			public void handle(ActionEvent arg0) {
				// TODO Auto-generated method stub
				System.out.println("Button clicked");
				
			}
		} );
		Scene scene=new Scene(root,300,300);
		root.getChildren().add(btn);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Button Class Example");
		primaryStage.show();
		
	}
	public static void main(String[] args) {
		launch(args);
	}
}

    

Output: