307
« en: 14 de Mayo 2017, 16:39 »
Hola, te puedes basar en la idea que se desprende de este fragmento de código basado en FocusTraversalPolicy:
List<Component> elementList = new ArrayList<Component>();
elementList.Add(element1);
elementList.Add(element2);
...
elementList.Add(elementx);
setFocusTraversalPolicy(new CustomFocusTraversalPolicy());
private class CustomFocusTraversalPolicy extends FocusTraversalPolicy {
public Component getComponentAfter(Container focusCycleRoot,Component aComponent) {
int currentPosition = elementList.indexOf(aComponent);
currentPosition = (currentPosition + 1) % elementList.size();
return (Component)elementList.get(currentPosition);
}
public Component getComponentBefore(Container focusCycleRoot,Component aComponent) {
int currentPosition = elementList.indexOf(aComponent);
currentPosition = (elementList.size() + currentPosition - 1) % elementList.size();
return (Component)elementList.get(currentPosition);
}
public Component getFirstComponent(Container cntnr) {
return (Component)elementList.get(0);
}
public Component getLastComponent(Container cntnr) {
return (Component)elementList.get(elementList.size() - 1);
}
public Component getDefaultComponent(Container cntnr) {
return (Component)elementList.get(0);
}
}
Aplicado a tu código quedaría así:
import javax.swing.*;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.FocusTraversalPolicy;
import java.awt.Container;
import java.awt.Component;
import java.util.List;
import java.util.ArrayList;
public class Pantalla extends JFrame{
private static final long serialVersionUID = 1L;
private JTextField txtPrimeraFactura;
private JTextField textField_Segundafactura;
private JLabel lblResultado;
List<Component> elementList;
//----------Pantalla----------------------------
public static void main(String[] ar) {
Pantalla formulario1=new Pantalla();
formulario1.setBounds(400,200,450,450);
formulario1.setVisible(true);
formulario1.setResizable(false);
}
//--------Titulo Pantalla-------------
public Pantalla() {
setAutoRequestFocus(false);
getContentPane().setFocusCycleRoot(true);
setTitle("Facturas Medicas");
setResizable(false);
setVisible(true);
//---------Tengo 429----------------------------------
JLabel lblTengoPara = new JLabel("Tengo 429.25 para gastar");
lblTengoPara.setVerticalAlignment(SwingConstants.TOP);
lblTengoPara.setVerticalTextPosition(SwingConstants.TOP);
lblTengoPara.setBounds(122, 11, 187, 31);
lblTengoPara.setForeground(Color.BLUE);
getContentPane().add(lblTengoPara);
//---------Entrada Datos----------------------------------
txtPrimeraFactura = new JTextField();
txtPrimeraFactura.setToolTipText("");
txtPrimeraFactura.setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));
txtPrimeraFactura.setFocusCycleRoot(true);
txtPrimeraFactura.setBounds(191, 53, 86, 20);
JLabel lblPrimeraFactura = new JLabel("Primera Factura:");
lblPrimeraFactura.setFocusCycleRoot(true);
lblPrimeraFactura.setBounds(28, 56, 101, 14);
getContentPane().setLayout(null);
getContentPane().add(lblPrimeraFactura, BorderLayout.WEST);
getContentPane().add(txtPrimeraFactura, BorderLayout.CENTER);
textField_Segundafactura = new JTextField();
textField_Segundafactura.setFocusCycleRoot(true);
textField_Segundafactura.setBounds(191, 78, 86, 20);
JLabel lblSegundaFactura = new JLabel("Segunda Factura:");
lblSegundaFactura.setFocusCycleRoot(true);
lblSegundaFactura.setBounds(28, 81, 101, 14);
getContentPane().setLayout(null);
getContentPane().add(lblSegundaFactura, BorderLayout.WEST);
getContentPane().add(textField_Segundafactura, BorderLayout.CENTER);
// ---------------Restar----------------------------------------------------
JButton btnRestar = new JButton("Restar");
btnRestar.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
double resto;
double total= 429.25;
int lblPrimeraFactura=Integer.parseInt(txtPrimeraFactura.getText());
int lblSegundaFactura=Integer.parseInt(textField_Segundafactura.getText());
resto= total - (lblPrimeraFactura+lblSegundaFactura);
lblResultado.setText("Resultado:"+resto);
if (resto<0)
lblResultado.setText("No puede ser negativa la suma de las facturas:"+resto);
lblResultado.setForeground(Color.red);
}
});
// ------Resultado-------------------------------------------------
btnRestar.setBounds(191, 135, 89, 23);
getContentPane().add(btnRestar);
lblResultado= new JLabel("Resultado:");
lblResultado.setBounds(10, 378, 384, 14);
getContentPane().add(lblResultado);
lblResultado.setForeground (Color.magenta);
//--------Finalizar-----------------------------------------------
final JButton btnFinalizar = new JButton("Finalizar");
btnFinalizar.setFocusCycleRoot(true);
btnFinalizar.setBounds(188, 222, 89, 23);
getContentPane().add(btnFinalizar);
btnFinalizar.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
elementList = new ArrayList<Component>();
elementList.add(txtPrimeraFactura);
elementList.add(textField_Segundafactura);
setFocusTraversalPolicy(new CustomFocusTraversalPolicy());
}
private class CustomFocusTraversalPolicy extends FocusTraversalPolicy {
public Component getComponentAfter(Container focusCycleRoot,Component aComponent) {
int currentPosition = elementList.indexOf(aComponent);
currentPosition = (currentPosition + 1) % elementList.size();
return (Component)elementList.get(currentPosition);
}
public Component getComponentBefore(Container focusCycleRoot,Component aComponent) {
int currentPosition = elementList.indexOf(aComponent);
currentPosition = (elementList.size() + currentPosition - 1) % elementList.size();
return (Component)elementList.get(currentPosition);
}
public Component getFirstComponent(Container cntnr) {
return (Component)elementList.get(0);
}
public Component getLastComponent(Container cntnr) {
return (Component)elementList.get(elementList.size() - 1);
}
public Component getDefaultComponent(Container cntnr) {
return (Component)elementList.get(0);
}
}
}
Saludos
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