Multiplos JPanel

Desenvolvi duas classe para poder fazer o esquema de por exemplo, em uma instalação você poderá usar a opção Avançar entre os painel e Voltar ao painel anterior.

Será necessário o uso desta classe como base para poder ter a mobilidade de adicionar e remover os JPanelNode.
Para usar basta adicionar em um JFrame e definindo seu tamanho no JFrame ou Compilando a classe JPanelRoot e arrastando para o JFrame.
Observação: manter a classe JPanelRoot dentro do pacote javax.swing.

package javax.swing;

public class JPanelRoot extends JPanel {

    private JPanel jPanelNode;

    public JPanelRoot() {
    }

    /**
     * @param jPanelNode parametro para definir o painel a ser exibido.
     */
    public void setjPanelNode(javax.swing.JPanel jPanelNode) {
        add(jPanelNode);//adiciona novo painel
        jPanelNode.setVisible(true);//exibe o novo painel
        if (this.jPanelNode != null) {//verifica se existe um painel antigo
            this.jPanelNode.setVisible(false);//se existir deixar invisivel
            remove(this.jPanelNode);//remover o antigo painel no, do painel raiz
        }
        this.jPanelNode = jPanelNode;//redefinir novo painel no
    }

    @Override
    public void paint(java.awt.Graphics g) {
        super.paint(g);//redimenciona ao mover a tela
        if (jPanelNode != null) {//verifica a existecia de um painel
            //codigo abaixo referese a dimencao toda do painel raiz
            javax.swing.GroupLayout jPanelRoot1Layout = new javax.swing.GroupLayout(this);
            setLayout(jPanelRoot1Layout);
            jPanelRoot1Layout.setHorizontalGroup(
                    jPanelRoot1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanelNode, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE));
            jPanelRoot1Layout.setVerticalGroup(
                    jPanelRoot1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanelNode, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE));
        }
    }
}

Após fazer um dos passos acima. Copie esta classe mantendo a classe JPanelNode dentro do pacote javax.swing.

package javax.swing;

public class JPanelNode extends JPanel {

    protected JPanelRoot jPanelRoot;//painel centra ou raiz
    private JPanel jPanelBack;//painel de volta caso queira
    
    /** 
     * @param jPanelRoot parametro para definir o painel raiz.
     */
    public JPanelNode(JPanelRoot jPanelRoot) {
        this.jPanelRoot = jPanelRoot;
    }
    /**
     * @param jPanelRoot parametro para definir o painel raiz.
     * @param jPanelBack caso exista um painel anterior para definir.
     */
    public JPanelNode(JPanelRoot jPanelRoot, JPanel jPanelBack) {
        this(jPanelRoot);
        this.jPanelBack = jPanelBack;
    }
    
    /**
     * @param jPanelNext parametro para definir o proximo painel a ser exibido.
     */
    public void next(JPanel jPanelNext) {
        jPanelRoot.setjPanelNode(jPanelNext);
    }
    
    /**
     * Metodo para definir o painel anterior a ser exibido.
     */
    public void back() {
        jPanelRoot.setjPanelNode(jPanelBack);
    }
}

Serão necessário apenas essas duas classe acima citada.
Vou dar um exemplo no começo pode parecer complicado mais depois começa a entender o funcionamento.

Classe principal de partidade.

package teste;

public class JFrameTeste extends javax.swing.JFrame {

    public JFrameTeste() {
        initComponents();
        jPanelRoot1.setjPanelNode(new JPanelPasso1(jPanelRoot1));
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jPanelRoot1 = new javax.swing.JPanelRoot();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout jPanelRoot1Layout = new javax.swing.GroupLayout(jPanelRoot1);
        jPanelRoot1.setLayout(jPanelRoot1Layout);
        jPanelRoot1Layout.setHorizontalGroup(
            jPanelRoot1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        jPanelRoot1Layout.setVerticalGroup(
            jPanelRoot1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanelRoot1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanelRoot1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JFrameTeste().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JPanelRoot jPanelRoot1;
    // End of variables declaration
}

Classe de passo 1: com a opção apenas de avançar

package teste;

import javax.swing.JPanel;
import javax.swing.JPanelRoot;

public class JPanelPasso1 extends javax.swing.JPanelNode {

    public JPanelPasso1(JPanelRoot jPanelRoot) {
        super(jPanelRoot);
        initComponents();
    }
    
    public JPanelPasso1(JPanelRoot jPanelRoot, JPanel jPanelBack) {
        super(jPanelRoot, jPanelBack);
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jButton1 = new javax.swing.JButton();

        jButton1.setText("Avançar [next]");
        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(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(285, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(266, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addContainerGap())
        );
    }// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    next(new JPanelPasso2(jPanelRoot, this));
}

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    // End of variables declaration
}

Classe de passo 2: com a opção de voltar e avançar

package teste;

import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JPanelNode;
import javax.swing.JPanelRoot;

public class JPanelPasso2 extends javax.swing.JPanelNode {

    public JPanelPasso2(JPanelRoot jPanelRoot, JPanel jPanelBack) {
        super(jPanelRoot, jPanelBack);
        initComponents();
    }

    public JPanelPasso2(JPanelRoot jPanelRoot) {
        super(jPanelRoot);
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();

        jButton1.setText("Avançar [next]");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Voltar [back]");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(186, Short.MAX_VALUE)
                .addComponent(jButton2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jButton1)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(266, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2))
                .addContainerGap())
        );
    }

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
    back();
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    JPanelNode painel = new JPanelNode(jPanelRoot, this);
    painel.setBackground(Color.WHITE);
    next(painel);
}

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    // End of variables declaration
}

Espero que tenha gostado ...
dessa forma não será mais preciso de ficar criando vários frame, apenas
crie um JPanel e manipule-o facilmento com essa duas classes, ficando
mais limpo o visual.

Contato:[email removido]

1 Resposta

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