package ejercicio2;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class EjercicioApplet2 extends Applet {
    private double maximo=1.0;
    private double minimo=0.0;
    TextField textField1 = new TextField();
    Scrollbar scrollbar1 = new Scrollbar();
    BorderLayout borderLayout1 = new BorderLayout();
  public void init() {
    try {
    jbInit();
    }
    catch (Exception e) {
    e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
        textField1.setText("0.0");
        textField1.setColumns(3);
    textField1.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        textField1_keyPressed(e);
      }
    });
        textField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textField1_actionPerformed(e);
            }
        });
        scrollbar1.setValue(0);
        scrollbar1.setOrientation(0);
        scrollbar1.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
            public void adjustmentValueChanged(AdjustmentEvent e) {
                scrollbar1_adjustmentValueChanged(e);
            }
        });
        this.setLayout(borderLayout1);
        this.add(textField1, BorderLayout.WEST);
        this.add(scrollbar1, BorderLayout.CENTER);
   }
 //funciones respuesta
       void scrollbar1_adjustmentValueChanged(AdjustmentEvent e) {
        int pos=e.getValue();
        textField1.setText(String.valueOf(valorDouble(pos)));
    }
//filtrado de caracteres
    void textField1_keyPressed(KeyEvent e) {
        char c=e.getKeyChar();
        if((c>='0' && c<='9')||(c=='.')||(c==KeyEvent.VK_DELETE)||(c==KeyEvent.VK_BACK_SPACE)){
            return;
        }
        e.consume();
    }

    void textField1_actionPerformed(ActionEvent e) {
        double pos=Double.valueOf(textField1.getText()).doubleValue();
        if(pos<minimo) pos=minimo;
        if(pos>maximo) pos=maximo;
        scrollbar1.setValue(valorEntero(pos));
    }
//funciones auxiliares  (cambio de escala)
    private int valorEntero(double x){
        return (int)((100*(x-minimo))/(maximo-minimo));
    }
    private double valorDouble(int x){
        return (minimo+x*(maximo-minimo)/100);
    }

}