java - Java Swing コンポーネントのリパック

Question

カードレイアウトを使用している場合、パック機能に問題があります。JPanel (カードレイアウト内) を含む 1 つの JFrame を作成しました。この JPanel には 2 つの JPanel が含まれています。...そのため、プログラムを実行すると、ウィンドウはプログラム内の最大の JPanel にサイズ変更され、動的にサイズ変更できません。

今画面：このパネルのみでプログラムを実行すると、私のbackground1（小さい背景）クラスは200のような幅を持ちますhttp://i41.tinypic.com/scfi88.jpg 400 http://i41.tinypic.com/2lu742x.jpgのように見えるので、background2 パネルの幅を取得します

両方の背景クラスで、プレビューの背景に戻るボタンがありますが、サイズが変更されることはありません。私はすでにこれらのアクションボタンで再検証および再描画機能を使用しています。コード: メインクラスと background1 と background2 (背景コードは、netbeans 設計モードによって生成されるため大きいです (それらはいくつかの空のコンポーネントです):

public class main extends javax.swing.JFrame {

private JPanel mainPanel;

public main() {
    mainPanel = new JPanel(new CardLayout());
    add(mainPanel);

    Background2 card1 = new Background2(mainPanel);
    Background1 card2 = new Background1(mainPanel);
    mainPanel.add(card1,"card1");
    mainPanel.add(card2,"card2");
    CardLayout cl = (CardLayout) (mainPanel.getLayout());
    cl.show(mainPanel, "card1");
    mainPanel.revalidate();
    mainPanel.repaint();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    pack();
}
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new main().setVisible(true);
        }
    });
}
}



public class Background1 extends javax.swing.JPanel {


private JPanel mainPanel;
/**
 * Creates new form HomePanel
 */
public Background1(JPanel panel) {
    mainPanel=panel;
    initComponents();
}


public JPanel getMainPanel() {
    return mainPanel;
}

public void setMainPanel(JPanel mainPanel) {
    this.mainPanel = mainPanel;
}
/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jScrollPane1 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    left_Panel = new javax.swing.JPanel();
    zakladka1_Button = new javax.swing.JButton();
    background_Panel = new javax.swing.JPanel();
    jScrollPane2 = new javax.swing.JScrollPane();
    jTable2 = new javax.swing.JTable();
    powrot_Button = new javax.swing.JButton();
    jLabel1 = new javax.swing.JLabel();
    jScrollPane3 = new javax.swing.JScrollPane();
    jTable3 = new javax.swing.JTable();

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null}
        },
        new String [] {
            "Title 1", "Title 2", "Title 3", "Title 4"
        }
    ));
    jScrollPane1.setViewportView(jTable1);

    zakladka1_Button.setText("button");
    zakladka1_Button.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            zakladka1_ButtonActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout left_PanelLayout = new javax.swing.GroupLayout(left_Panel);
    left_Panel.setLayout(left_PanelLayout);
    left_PanelLayout.setHorizontalGroup(
        left_PanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(left_PanelLayout.createSequentialGroup()
            .addContainerGap()
            .addComponent(zakladka1_Button)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    left_PanelLayout.setVerticalGroup(
        left_PanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(left_PanelLayout.createSequentialGroup()
            .addGap(5, 5, 5)
            .addComponent(zakladka1_Button)
            .addGap(433, 433, 433))
    );

    jTable2.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null}
        },
        new String [] {
            "Title 1", "Title 2", "Title 3", "Title 4"
        }
    ));
    jScrollPane2.setViewportView(jTable2);

    javax.swing.GroupLayout background_PanelLayout = new javax.swing.GroupLayout(background_Panel);
    background_Panel.setLayout(background_PanelLayout);
    background_PanelLayout.setHorizontalGroup(
        background_PanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(background_PanelLayout.createSequentialGroup()
            .addGap(32, 32, 32)
            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 452, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(83, Short.MAX_VALUE))
    );
    background_PanelLayout.setVerticalGroup(
        background_PanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, background_PanelLayout.createSequentialGroup()
            .addContainerGap(14, Short.MAX_VALUE)
            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 319, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap())
    );

    powrot_Button.setText("<--");
    powrot_Button.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            powrot_ButtonActionPerformed(evt);
        }
    });

    jLabel1.setText("jLabel1");

    jTable3.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null}
        },
        new String [] {
            "Title 1", "Title 2", "Title 3", "Title 4"
        }
    ));
    jScrollPane3.setViewportView(jTable3);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(left_Panel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGroup(layout.createSequentialGroup()
                    .addGap(21, 21, 21)
                    .addComponent(powrot_Button)))
            .addGap(18, 18, 18)
            .addComponent(background_Panel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jLabel1)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(18, 18, 18)
            .addComponent(powrot_Button, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(left_Panel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        .addGroup(layout.createSequentialGroup()
            .addComponent(background_Panel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(0, 0, Short.MAX_VALUE))
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jLabel1)
                    .addGap(115, 115, 115))
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                    .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(42, 42, 42))))
    );
}// </editor-fold>                        

private void powrot_ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                              
    CardLayout cl = (CardLayout) (mainPanel.getLayout());
    cl.show(mainPanel, "card1");
    mainPanel.revalidate();
    mainPanel.repaint();
}                                             

private void zakladka1_ButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                 

}                                                



// Variables declaration - do not modify                     
private javax.swing.JPanel background_Panel;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JTable jTable1;
private javax.swing.JTable jTable2;
private javax.swing.JTable jTable3;
private javax.swing.JPanel left_Panel;
private javax.swing.JButton powrot_Button;
private javax.swing.JButton zakladka1_Button;
// End of variables declaration                   
}

public class Background2 extends javax.swing.JPanel {


private JPanel mainPanel;

public Background2(JPanel panel) {
    mainPanel=panel;
    initComponents();  
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    loginFieldLabel = new javax.swing.JLabel();
    zalogujButton = new javax.swing.JButton();
    loginField = new javax.swing.JTextField();
    passwordField = new javax.swing.JPasswordField();
    logowanieLabel = new javax.swing.JLabel();
    passwordFieldLabel = new javax.swing.JLabel();
    jButton1 = new javax.swing.JButton();

    loginFieldLabel.setText("Login");

    zalogujButton.setText("Zaloguj");
    zalogujButton.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            zalogujButtonActionPerformed(evt);
        }
    });

    loginField.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            loginFieldActionPerformed(evt);
        }
    });

    passwordField.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            passwordFieldActionPerformed(evt);
        }
    });

    logowanieLabel.setText("Logowanie");

    passwordFieldLabel.setText("Hasło");

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

    org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
        .add(layout.createSequentialGroup()
            .addContainerGap(org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .add(zalogujButton)
            .add(149, 149, 149))
        .add(org.jdesktop.layout.GroupLayout.LEADING, layout.createSequentialGroup()
            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                .add(org.jdesktop.layout.GroupLayout.LEADING, layout.createSequentialGroup()
                    .addContainerGap()
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                        .add(logowanieLabel)
                        .add(layout.createSequentialGroup()
                            .add(56, 56, 56)
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                                .add(passwordFieldLabel)
                                .add(loginFieldLabel))
                            .add(26, 26, 26)
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                                .add(loginField)
                                .add(passwordField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 193, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))))
                .add(org.jdesktop.layout.GroupLayout.LEADING, layout.createSequentialGroup()
                    .add(105, 105, 105)
                    .add(jButton1)))
            .addContainerGap(190, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
        .add(layout.createSequentialGroup()
            .addContainerGap()
            .add(logowanieLabel)
            .add(29, 29, 29)
            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                .add(loginField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .add(loginFieldLabel))
            .add(28, 28, 28)
            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                .add(passwordFieldLabel)
                .add(passwordField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
            .add(33, 33, 33)
            .add(zalogujButton)
            .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
            .add(jButton1)
            .addContainerGap(101, Short.MAX_VALUE))
    );
}// </editor-fold>                        

private void zalogujButtonActionPerformed(java.awt.event.ActionEvent evt) {                                              

}                                             

private void loginFieldActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here:
}                                          

private void passwordFieldActionPerformed(java.awt.event.ActionEvent evt) {                                              
    // TODO add your handling code here:
}                                             

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    CardLayout cl = (CardLayout) (mainPanel.getLayout());
    cl.show(mainPanel, "card2");
    mainPanel.revalidate();
    mainPanel.repaint();
}                                        



// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JTextField loginField;
private javax.swing.JLabel loginFieldLabel;
private javax.swing.JLabel logowanieLabel;
private javax.swing.JPasswordField passwordField;
private javax.swing.JLabel passwordFieldLabel;
private javax.swing.JButton zalogujButton;
// End of variables declaration                   
}

編集：

CardLayout cl = (CardLayout) (mainPanel.getLayout());
cl.show(mainPanel, "card1");
l.preferredLayoutSize(mainPanel);//l = ShowingSizeCardLayout i added here prints on dim.width and dim.height 
mainPanel.revalidate();

出力：

width: 509
height: 323
width: 1203
height: 537

ただし、常に 509 323 です。

score 1 · Accepted Answer

CardLayout のデフォルトの動作は、コンテナーの優先サイズを、サイズとインセットを表示するコンポーネントとして設定することです。

CardLayout をサブクラス化し、 preferredLayoutSizeメソッドをオーバーライドする必要があります。

class ShowingSizeCardLayout extends CardLayout {

    public Dimension preferredLayoutSize(Container container) {

        Insets insets = container.getInsets();

        Dimension dim = null;

        for (Component component : container.getComponents()) {
            if (component.isVisible()) {
                dim = component.getPreferredSize();
            }
        }

        dim.width += insets.left + insets.right;
        dim.height += insets.top + insets.bottom;

        return dim;

    }
}

これで問題ありませんが、null ポインターをチェックするコードを追加します。

java - Java Swing コンポーネントのリパック

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