Java Swing重新包裝組件

使用卡布局時，我有包功能問題。我創建了1個包含JPanel的JFrame（在cardlayout中），這個JPanel包含兩個JPanel。 ...所以當我運行我的程序時，窗口被調整爲程序中最大的JPanel，我不能動態調整它的大小。Java Swing重新包裝組件

現在屏幕：我background1（小背景）班時，我只能用這個面板運行的程序有寬度像200 http://i41.tinypic.com/scfi88.jpg 當我跑我的添加background2背景得到它的寬度程序，所以它看起來像400 http://i41.tinypic.com/2lu742x.jpg 所以它得到我background2面板

在這兩個背景類我有按鈕，返回到預覽背景的寬度，但它永遠不會調整。我已經在thoose動作按鈕上使用了revalidate和repaint函數。代碼：主類和 background1和 background2（背景代碼大，因爲它們是由NetBeans的設計模式中生成（它們只是幾個空組件）：

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     
}

編輯：

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();

輸出：

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

但它總是509 323.

來源

2013-10-02 user2771738

爲了儘快提供更好的幫助，請發佈[SSCCE]（http://sscce.org/）。（一個源文件，而不是3.）BTW - PNG比截圖更好的JPG ..請參閱[如何創建屏幕截圖？]（http://meta.stackexchange.com/questions/99734/how-doi-i-創建一個截圖來說明一個職位）（關於製作*很棒*截圖的提示）。 –

好的，我修復了一點點代碼。關於圖片我沒有足夠的聲譽來使用該功能。 Thx的建議。 – user2771738

*「關於圖片我沒有足夠的聲譽來使用該功能」*我給的鏈接幾乎與發佈圖片到網站無關，*所有*與*製作* *可以上傳到這個偉大的圖像網站，任何其他圖像網站，或用於記錄程序本身。請再次閱讀，這次更仔細。至於將圖片上傳到* this *網站（SO），如果它們不是JPEG，它們的字節就會更小，我會爲你做到這一點。 –

CardLayout的默認行爲是將容器的首選大小設置爲顯示大小加上插頁的組件。

你應該繼承CardLayout和覆蓋 preferredLayoutSize方法：

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; 

    } 
}

這樣做，但添加代碼來檢查空指針。

來源

2013-10-02 15:11:46

嗯差不多。當我運行程序面板被調整到較小的JPanel。當我換到第二個更大的面板獲得更小的寬度尺寸。所以之前，200是400，現在是400 200.我在更換卡片時開始調用這個prefferedsizefuncion，並且它似乎計算了良好的寬度和高度，但jpanel沒有調整大小（編輯後的第一篇文章中的代碼） – user2771738

You不應該調用'preferredLayoutSize'。這是佈局經理應該這樣做的。該框架，因此，具有卡布局的面板將具有第一個「面板卡」的大小。如果更換顯示卡，即使首選尺寸發生變化，框架和主面板也不應自動調整大小。在'preferredLayoutSize'中，您正在設置首選大小，而不是當前大小。如果你想調整幀大小，請調用'pack'方法。再次，不要調用'preferredLayoutSize'。 –

大成功！ Thx很多。用fram.pack（）覆蓋CardLayout解決了我的問題！ @安德魯湯普森問題解決了，所以我不會編輯第一篇文章，對不起; p – user2771738

Java Swing重新包裝組件

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