Salve galera....Estou tentando add um JPanel a uma área de um JFrame mas não estou conseguindo, esse JPanel eh para ser adicionado com um evento de click num JMenuItem. to tentando assim //classe extend JPanel publ…

Adicionando JPanel a uma area?

//classe extend JPanel public class DesktopArea extends JPanel{ private static int deskCount; public DesktopArea(){ JLabel label = new JLabel("" + deskCount); label.setForeground(Color.WHITE); this.add(label); this.setBackground(Color.BLACK); this.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR)); deskCount++; } public Integer getDeskCount(){ return this.deskCount; } } // JFrame, metodo de inicializacao no JFrame public class FramePrincipal extends JFrame{ public FramePrincipal(){ begin(); } } public void begin(){ DesktopArea deskArea = new DesktopArea(); this.setExtendedState(MAXIMIZED_BOTH); this.setLayout(new BorderLayout()); this.add(panelNorth, BorderLayout.NORTH); this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui funciona a primeira vez, qdo coloco esse metodo no construtor do JFrame this.add(panelSouth, BorderLayout.SOUTH); this.setTitle("Project" + deskArea.getDeskCount()); } //aqui onde eu tento adicionar novamente o JPanel ao JFrame FramePrincipal private void fileNewActionPerformed(java.awt.event.ActionEvent evt) { DesktopArea deskArea = new DesktopArea(); this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel this.setTitle("Project" + deskArea.getDeskCount()); this.getContentPane().repaint(); }

1 Resposta

JoaoBluSCBR 5 de out. de 2011

Eu nao entendi muito bem onde vc colocou esse teu FileNew event, ligado a que ele estah,
mas criei um menu, atrelei ele a um evento action.

Criei o evento action e beleza, o panel foi instanciado.

Vê se te ajuda em algo:

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class FramePrincipal extends JFrame {
    
    JPanel panelNorth = new JPanel();
    JPanel panelSouth = new JPanel();

    public FramePrincipal() {
        begin();
    }

    public void begin() {
        
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem(); 
        jMenu1.setText("File");

        jMenuItem1.setText("jMenuItem1");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem1ActionPerformed(evt);
            }
        });
        jMenu1.add(jMenuItem1);
        jMenuBar1.add(jMenu1);
        
        setJMenuBar(jMenuBar1);
        
        DesktopArea deskArea = new DesktopArea();
        this.setExtendedState(MAXIMIZED_BOTH);
        this.setLayout(new BorderLayout());

        this.add(panelNorth, BorderLayout.NORTH);
        this.getContentPane().add(deskArea, BorderLayout.CENTER);  //aqui funciona a primeira vez, qdo coloco esse metodo no construtor do JFrame   
        this.add(panelSouth, BorderLayout.SOUTH);
        this.setTitle("Project" + deskArea.getDeskCount());
    }

//aqui onde eu tento adicionar novamente o JPanel ao JFrame FramePrincipal   
    private void fileNewActionPerformed(java.awt.event.ActionEvent evt) {
        DesktopArea deskArea = new DesktopArea();
        this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel   
        this.setTitle("Project" + deskArea.getDeskCount());
        this.getContentPane().repaint();
    }
    
    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {       
        DesktopArea deskArea = new DesktopArea();
        this.getContentPane().add(deskArea, BorderLayout.CENTER); //aqui onde tento add o JPanel   
        this.setTitle("Project" + deskArea.getDeskCount());
        this.getContentPane().repaint();
    }
    
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenu jMenu3;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new FramePrincipal().setVisible(true);
            }
        });
    }
}

1 Resposta

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