CSC-112 Ch15 Control Circl eWith Buttons, Mouse, and Keys (Shows consume method)

ControlCircleWithMouseAndKey.java

/*
 * Antonio C. Silvestri
 * Ch15 Control Circle with Buttons, Mouse, and Keys (Demos consume method)
 * CSC-112 Intermediate Java
 * 4/9/2020
 */

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.input.KeyCode;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.HBox;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Circle;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ControlCircleWithMouseAndKey extends Application {
	@Override
	public void start(Stage primaryStage) {
		AppGUI ag =new AppGUI();
		Scene scene = new Scene(ag, 200, 150);
		ag.requestFocus();
		primaryStage.setTitle("Control Circle With Buttons, Mouse, and Keys");
		primaryStage.setScene(scene);
		primaryStage.show();
	}

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

//**************************************************************

class AppGUI extends BorderPane {
	private CirclePane cp = new CirclePane();
	public AppGUI() {
		ControlButtonsPane cbp = new ControlButtonsPane(cp);
		this.setCenter(cp);
		this.setBottom(cbp);
	}
	
	public void requestFocus() {
		this.cp.requestFocus();
	}
}

//**************************************************************

class CirclePane extends StackPane {
	private int radius;
	private Circle circle = new Circle();

	public CirclePane() {
		this.radius = 50;
		
		this.setOnKeyPressed((KeyEvent e) -> {
			KeyCode kc = e.getCode();
			if (kc == KeyCode.UP || kc == KeyCode.RIGHT) {
				this.enlarge();
				e.consume();
			} else if (kc == KeyCode.DOWN || kc == KeyCode.LEFT) {
				this.shrink();
				e.consume();
			}
		});
		
		this.setOnMouseClicked((MouseEvent e) -> {
			if (e.getButton() == MouseButton.PRIMARY) {
				this.enlarge();
			} else if (e.getButton() == MouseButton.SECONDARY) {
				this.shrink();
			}
			this.requestFocus();
		});
		paintCircle();
	}
	
	private void paintCircle() {
		this.getChildren().clear();
		circle = new Circle(this.radius);
		circle.setStroke(Color.BLACK);
		circle.setFill(Color.WHITE);
		this.getChildren().add(circle);
	}

	public void enlarge() {
		this.radius += 2;
		paintCircle();
	}

	public void shrink() {
	    this.radius -= 2;
	    if (this.radius < 0)
	    	this.radius = 0;
	    paintCircle();
	}
}

//**************************************************************

class ControlButtonsPane extends HBox {

	public ControlButtonsPane(CirclePane cp) {
		this.setSpacing(10);
		this.setAlignment(Pos.CENTER);
		Button btEnlarge = new Button("Enlarge");
		Button btShrink = new Button("Shrink");
		this.getChildren().add(btEnlarge);
		this.getChildren().add(btShrink);

		// Create and register the handler
		btEnlarge.setOnAction((ActionEvent e) -> {
			cp.enlarge();
			cp.requestFocus();
		});
		btShrink.setOnAction(e -> {
			cp.shrink();
			cp.requestFocus();
		});
	}

}