Respuestas de la comunidad Computrachos.com

1. 

   98

   

   10-27-11

   Randy respondió:

   Los Eventos posibles para un JLabel en Java son:

   public void mousePressed(MouseEvent event){}
   public void mouseExited(MouseEvent event) {}
   public void mouseReleased(MouseEvent event) {}
   public void mouseClicked(MouseEvent event) {}
   public void mouseEntered(MouseEvent event) {}

   Funciones del interface MouseMotionListener:
   public void mouseDragged(MouseEvent ev) {}
   public void mouseMoved(MouseEvent event) {}

   En este ejemplo usaremos mouseClicked.

   Eventos_JLabel.java

   package data.amayasystems.com;
   
   import java.awt.Dimension;
   import java.awt.Toolkit;
   import javax.swing.JOptionPane;
   
   /**
    *
    * @author Ing. Randy F. Amaya Guillen
    * UTH - Campus La Ceiba
    * Movil: +504 9565 4366
    * Email: randyamaya@amayasystems.com
    *
    * COMPUTRACHOS.COM
    * La Comunidad Donde el Conocimiento se Comparte.
    * http://computrachos.com
    *
    */
   
   public class Eventos_JLabel extends javax.swing.JFrame
   {
       public Eventos_JLabel()
       {
           initComponents();
           Dimension pantalla=Toolkit.getDefaultToolkit().getScreenSize();
           this.setLocation((pantalla.width-this.getPreferredSize().width)/2,(pantalla.height-this.getPreferredSize().height)/2);
       }
   
       @SuppressWarnings("unchecked")
       // <editor-fold defaultstate="collapsed" desc="Generated Code">
       private void initComponents() {
   
           titulo = new javax.swing.JLabel();
           imagen = new javax.swing.JLabel();
           jButton1 = new javax.swing.JButton();
   
           setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
   
           titulo.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N
           titulo.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
           titulo.setText("Eventos Listener en JLabel");
           titulo.setName("titulo"); // NOI18N
   
           imagen.setIcon(new javax.swing.ImageIcon(getClass().getResource("/data/amayasystems/com/Logo_Computrachos_v5.png"))); // NOI18N
           imagen.setName("imagen"); // NOI18N
           imagen.addMouseListener(new java.awt.event.MouseAdapter() {
               public void mouseClicked(java.awt.event.MouseEvent evt) {
                   imagenMouseClicked(evt);
               }
           });
   
           jButton1.setText("Cerrar");
           jButton1.setName("jButton1"); // NOI18N
           jButton1.addActionListener(new java.awt.event.ActionListener() {
               public void actionPerformed(java.awt.event.ActionEvent evt) {
                   jButton1ActionPerformed(evt);
               }
           });
   
           javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
           getContentPane().setLayout(layout);
           layout.setHorizontalGroup(
               layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
               .addGroup(layout.createSequentialGroup()
                   .addContainerGap()
                   .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                       .addComponent(imagen, javax.swing.GroupLayout.PREFERRED_SIZE, 362, javax.swing.GroupLayout.PREFERRED_SIZE)
                       .addComponent(titulo, javax.swing.GroupLayout.DEFAULT_SIZE, 362, Short.MAX_VALUE)
                       .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING))
                   .addContainerGap())
           );
           layout.setVerticalGroup(
               layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
               .addGroup(layout.createSequentialGroup()
                   .addContainerGap()
                   .addComponent(titulo, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
                   .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                   .addComponent(imagen, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE)
                   .addGap(18, 18, 18)
                   .addComponent(jButton1)
                   .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
           );
   
           pack();
       }// </editor-fold>
   
       private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
           System.exit(0);
       }
   
       private void imagenMouseClicked(java.awt.event.MouseEvent evt) {
           JOptionPane.showMessageDialog(null,"Posicion de la Imagen: \nX="+imagen.getBounds().getCenterX()+" Y="+imagen.getBounds().getCenterY());
       }
   
       public static void main(String args[])
       {
            java.awt.EventQueue.invokeLater(new Runnable()
            {
   
               public void run()
               {
                   new Eventos_JLabel().setVisible(true);
               }
           });
       }
       // Variables declaration - do not modify
       private javax.swing.JLabel imagen;
       private javax.swing.JButton jButton1;
       private javax.swing.JLabel titulo;
       // End of variables declaration
   }
   

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