Re: Problem with JComboBox

Hi,

Try putting :

((JComponent)presentacion.getContentPane()).revalidate();
before
presentacion.repaint();

Regards,

Arnaud


"Derek" <yo@xxxxxx> a écrit dans le message news:
d5n5h5$o715@xxxxxxxxxxxxxxx
> Hello:
>
> I have the following problem to use JComboBox.
>
> I have an aplication that have two panels. When I run the aplication this
> show a first panel (Presentacion). It has a button and when I click this
> button it remove the current panel and show the second panel (Formulario).
> This second panel has two JComboBox elements. And, here is the problem,
> these JComboBox show like an "white space". Don´t show correctly.
>
> But, if I show first the panel (Formulario) that has the JComboBox
elements,
> these show correctly.
>
> The code is the following. Compile and run it to see the problem:
>
> import java.awt.Color;
> import java.awt.event.ActionEvent;
> import java.awt.event.ActionListener;
>
> import javax.swing.JButton;
> import javax.swing.JComboBox;
> import javax.swing.JFrame;
> import javax.swing.JLabel;
> import javax.swing.JPanel;
>
> /* FrameDemo.java requires no other files. */
> public class Presentacion extends JFrame implements ActionListener{
>
> JPanel panelPresentacion = null;
> JPanel panelFormulario = null;
> JPanel panelProgreso = null;
>
> JButton botoniniciar = null;
> JButton botonatras = null;
> JButton botonadelante = null;
>
> JComboBox comboNombre = null;
> JComboBox comboNombre2 = null;
>
> static Presentacion presentacion = new Presentacion();
>
> public Presentacion() {
> super("Interfaz Tarjeta");
> getContentPane().setLayout(null);
> getContentPane().setBounds(0,0,400,400);
> getContentPane().setBackground(Color.blue);
> getContentPane().add(getPanelPresentacion());
> file://getContentPane().add(getPanelFormulario());
>
> pack();
> setResizable(false);
> setLocation(200, 200);
> setSize(400,400);
> setVisible(true);
> }
>
>
>
> public JPanel getPanelPresentacion() {
>
> if (panelPresentacion==null)
> {
> panelPresentacion= new JPanel();
> panelPresentacion.setBounds(0,2, 600,600);
> panelPresentacion.setBackground(Color.gray.brighter());
> panelPresentacion.setLayout(null);
>
>
> JLabel l = new JLabel("Bienvenido...");
> l.setBounds(10,40,100,25);
> panelPresentacion.add(l);
> panelPresentacion.add(getBotonIniciar());
>
> }
> getRootPane().setDefaultButton(getBotonIniciar());
> return panelPresentacion;
> }
>
>
>
> public JPanel getPanelFormulario() {
>
> if (panelFormulario == null)
> {
> panelFormulario= new JPanel();
> panelFormulario.setBounds(0,2, 400,400);
> panelFormulario.setBackground(Color.gray.brighter());
> panelFormulario.setLayout(null);
>
> panelFormulario.add(getCombo());
> panelFormulario.add(getCombo2());
>
> panelFormulario.add(getBotonAtras());
> }
> return panelFormulario;
> }
>
>
>
> public JComboBox getCombo() {
> if (comboNombre == null)
> {
> comboNombre = new JComboBox();
> comboNombre.setBounds(10,40,100,20);
> comboNombre.setBackground(Color.WHITE);
> comboNombre.addItem("objeto1");
> comboNombre.addItem("objeto2");
> comboNombre.addActionListener(this);
> }
> return comboNombre;
> }
>
>
> public JComboBox getCombo2() {
> if (comboNombre2 == null)
> {
> comboNombre2 = new JComboBox();
> comboNombre2.setBounds(10,100,100,20);
> comboNombre2.setBackground(Color.WHITE);
> comboNombre2.addItem("elemento1");
> comboNombre2.addItem("elemento2");
> comboNombre2.addActionListener(this);
> }
> return comboNombre2;
> }
>
>
> public JButton getBotonIniciar() {
>
> if (botoniniciar==null)
> {
> botoniniciar = new JButton("Iniciar");
> botoniniciar.setBounds(100,100,100,25);
> botoniniciar.addActionListener(this);
> }
> return botoniniciar;
> }
>
>
> public JButton getBotonAtras() {
>
> if (botonatras==null)
> {
> botonatras = new JButton("Atrás");
> botonatras.setBounds(50,200,100,25);
> botonatras.addActionListener(this);
> }
> return botonatras;
> }
>
>
>
> public void actionPerformed(ActionEvent event){
> if (event.getSource() == getBotonIniciar())
> {
>
> presentacion.remove(getPanelPresentacion());
> System.out.println("Pulsado boton Iniciar");
> presentacion.getContentPane().add(getPanelFormulario());
>
> presentacion.repaint();
>
>
> }
> else if (event.getSource() == getBotonAtras())
> {
> presentacion.remove(getPanelFormulario());
> System.out.println("Pulsado boton Atras");
> presentacion.getContentPane().add(getPanelPresentacion());
>
> presentacion.repaint();
> }
> else if (event.getSource() == getCombo())
> {
> System.out.println(getCombo().getSelectedItem());
> }
> else if (event.getSource() == getCombo())
> {
> System.out.println(getCombo().getSelectedItem());
> }
> else if (event.getSource() == getCombo2())
> {
> System.out.println(getCombo2().getSelectedItem());
> }
> }
>
>
>
>
> public static void main(String[] args) {
> JFrame.setDefaultLookAndFeelDecorated(true);
>
> file://Presentacion presentacion = new Presentacion();
>
> presentacion.setTitle("Interfaz Smart Card");
> presentacion.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> presentacion.setVisible(true);
>
> // Cursor en espera //
>
file://presentacion.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)
);
> // Cursor en espera //
>
> }
> }
>
>
> What is the problem?.
>
> Thanks.
>
>
>


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