How to generate rectangle with user values in output? - javafx

Question

I have seen examples of Rectangle in JavaFx. But Please can anybody Provide me the example where in output window/Scene, if user put desirable width and height, rectangle should be generated automatically.
here is my example
VBox vb = new VBox(20);
HBox h1 = new HBox(7);
HBox h2 = new HBox(7);
Label lebel1 = new Label("X:");
Label lebel2 = new Label("Y:");
TextField txt1 = new TextField();
TextField txt2 = new TextField();
//Converting textfield to integer only
ChangeListener<String> forceNumberListener = (observable, oldValue, newValue) -> {
if (!newValue.matches("\\d*"))
((StringProperty) observable).set(oldValue);
};
txt1.textProperty().addListener(forceNumberListener);
txt2.textProperty().addListener(forceNumberListener);
double width = Double.parseDouble(txt1.getText());
double height = Double.parseDouble(txt2.getText());
Rectangle rect1 = new Rectangle();
rect1.setHeight(height);
rect1.setWidth(width);
h1.getChildren().addAll(lebel1, txt1);
h2.getChildren().addAll(lebel2, txt2);
vb.getChildren().addAll(h1,h2,rect1);
If user put any integer value in "x" as width, "y" as height, Rectangle should be generated below fields. but this code is wrong and i don't know other methods. Please
Thank you so much

Answer 1

You should use the TextField's onkeyreleased event handler. In this app, if both TextFields have a number typed in, a rectangle will be generated. Both TextFields have an event handler that does the same thing if one of their text is changed. This does not catch for any non-double values.
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
/**
*
* #author blj0011
*/
public class JavaFXApplication104 extends Application
{
#Override
public void start(Stage primaryStage)
{
BorderPane root = new BorderPane();
VBox vbox = new VBox();
vbox.setMinWidth(100);
TextField textfield1 = new TextField();
TextField textfield2 = new TextField();
textfield1.setPrefWidth(50);
textfield1.setPromptText("Enter height");
textfield1.setOnKeyReleased(new EventHandler<KeyEvent>(){
#Override
public void handle(KeyEvent event)
{
if(textfield1.getText().length() > 0 && textfield2.getText().length() > 0)
{
Rectangle rectangle = new Rectangle();
rectangle.setHeight(Double.parseDouble(textfield1.getText()));
rectangle.setWidth(Double.parseDouble(textfield2.getText()));
rectangle.setFill(Color.BLUE);
root.setCenter(rectangle);
}
}
});
textfield2.setPrefWidth(100);
textfield2.setPromptText("Enter length");
textfield2.setOnKeyReleased(new EventHandler<KeyEvent>(){
#Override
public void handle(KeyEvent event)
{
if(textfield1.getText().length() > 0 && textfield2.getText().length() > 0)
{
Rectangle rectangle = new Rectangle();
rectangle.setHeight(Double.parseDouble(textfield1.getText()));
rectangle.setWidth(Double.parseDouble(textfield2.getText()));
rectangle.setFill(Color.BLUE);
root.setCenter(rectangle);
}
}
});
vbox.getChildren().addAll(textfield1, textfield2);
root.setLeft(vbox);
Scene scene = new Scene(root, 500, 500);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}