✔ JavaFx Programming ⚡ Convert feet to meters 🔥 Tecq Mate Tutorials ✌

import javafx.application.Application; 

import javafx.geometry.Insets; 
import javafx.geometry.Pos; 

import javafx.scene.Scene; 
import javafx.scene.control.Button;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.control.TextField; 
import javafx.scene.layout.GridPane; 
import javafx.scene.text.Text;
import javafx.scene.paint.Color;
import javafx.scene.control.Toggle;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;

import javafx.event.ActionEvent;  
import javafx.event.EventHandler;

import javafx.stage.Stage; 

public class ConverterApp extends Application {

  private void resetUI(TextField tf1, TextField tf2, Text t){
    tf1.setText("");
    tf2.setText("");
    t.setText("");
    tf1.setEditable(true);
    tf2.setEditable(false);
  }

  @Override 
  public void start(Stage stage) {
    TextField tfFeet = new TextField();       
    TextField tfMeter = new TextField();
    Button btnConvert = new Button("Convert"); 
    Button btnClear = new Button("Clear");
    ToggleGroup group = new ToggleGroup();
    RadioButton rbFeet = new RadioButton("Feet to Meters"); 
    RadioButton rbMeter = new RadioButton("Meters to Feet");
    rbFeet.setToggleGroup(group);
    rbMeter.setToggleGroup(group);
    btnClear.setOnAction(new EventHandler<ActionEvent>() {  
      @Override  
      public void handle(ActionEvent e) {  
        rbFeet.setSelected(!true);
        rbFeet.setSelected(true);
      }
    });
    Text lbError = new Text();
    btnConvert.setOnAction(new EventHandler<ActionEvent>() {  
      @Override  
      public void handle(ActionEvent e) {
        lbError.setText("");
        final double FACTOR = 3.2808399;
        try{
          if(rbFeet == group.getSelectedToggle()){
            tfMeter.setText(String.valueOf(new Double(tfFeet.getText())/FACTOR));
          } else {
            tfFeet.setText(String.valueOf(new Double(tfMeter.getText())*FACTOR));
          }
        }catch(NumberFormatException ex){
          lbError.setText("Error: "+ex.getMessage());
        }
      }
    });
    group.selectedToggleProperty().addListener(new ChangeListener<Toggle>() {
      public void changed(ObservableValue<? extends Toggle> ov, Toggle prev, Toggle cur) {
        if(rbFeet == group.getSelectedToggle()){
          resetUI(tfFeet,tfMeter,lbError);
        } else if(rbMeter == group.getSelectedToggle()){
          resetUI(tfMeter,tfFeet,lbError);
        }
      }
    });

    rbFeet.setSelected(true);
    lbError.setFill(Color.RED);
    GridPane gridPane = new GridPane();
    gridPane.setPadding(new Insets(5, 5, 5, 5)); 
    gridPane.setVgap(5);
    gridPane.setHgap(5);
    gridPane.setAlignment(Pos.CENTER);
    gridPane.addRow(0, rbFeet, rbMeter);
    gridPane.addRow(1, new Text("Feet"), tfFeet);
    gridPane.addRow(2, new Text("Meter"), tfMeter);
    gridPane.addRow(3, btnConvert, btnClear);
    gridPane.setColumnSpan(lbError,2);
    gridPane.addRow(4, lbError);
    stage.setTitle("Converter Application");
    stage.setScene(new Scene(gridPane,300,160));
    stage.show(); 
  }

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

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