0
我希望有人能夠幫助我解決以下問題。我正在創建一個Java桌面應用程序，其中我有一個包含兩個JPanel的JPanel topicPanel; topicButtonsPanel包含JButton的createEntryButton和topicTabCardsPanel，它實現了CardLayout。當單擊createEntryButton時，我試圖動態創建並添加一個新的包含JTextlabels，JTextFIelds和JButtons的JPanel entryPanel。在topicPanel類中所執行的動作方法中使用的代碼是：動態添加一個JPanel到CardLayout時組件顯示不正確
private void createEntryButtonActionPerformed(java.awt.event.ActionEvent evt) {
EntryPanel entryPanel = new EntryPanel();
add(entryPanel);
CardLayout cards = (CardLayout) topicTabCardsPanel.getLayout();
cards.addLayoutComponent(entryPanel, "entryPanelCard");
cards.show(topicTabCardsPanel, "entryPanelCard");
}
然而，雖然entryPanel被添加到topicPanel，所述topicPanel內的組件沒有被正確顯示。只有JTextFields顯示正確顯示，JLabel根本不顯示，JButtons只在盤旋時顯示。我還有一個JTextArea，它在懸停時不顯示滾動條。
下面是兩個topicPanel和entryPanel類代碼：
import java.awt.CardLayout;
public class TopicTab extends javax.swing.JPanel {
private ProjectPanel projectPanel;
/**
* Creates new form TopicTab
*/
public TopicTab(ProjectPanel projectPanel) {
initComponents();
this.projectPanel = projectPanel;
}
public TopicTab() {
initComponents();
}
public static void main(String args[]) {
TopicTab topicTab = new TopicTab();
topicTab.setVisible(true);
}
/**
* 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() {
topicButtonsPanel = new javax.swing.JPanel();
createEntryButton = new javax.swing.JButton();
importEntryButton = new javax.swing.JButton();
topicTabCardsPanel = new javax.swing.JPanel();
timelinePanel = new Timeline.TimelinePanel();
setMinimumSize(new java.awt.Dimension(1275, 672));
setPreferredSize(new java.awt.Dimension(1275, 672));
setLayout(new java.awt.BorderLayout());
topicButtonsPanel.setBackground(new java.awt.Color(255, 255, 255));
createEntryButton.setText("Create Entry");
createEntryButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
createEntryButtonActionPerformed(evt);
}
});
importEntryButton.setText("Import Entry");
javax.swing.GroupLayout topicButtonsPanelLayout = new javax.swing.GroupLayout(topicButtonsPanel);
topicButtonsPanel.setLayout(topicButtonsPanelLayout);
topicButtonsPanelLayout.setHorizontalGroup(
topicButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(topicButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(createEntryButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(importEntryButton)
.addContainerGap(1071, Short.MAX_VALUE))
);
topicButtonsPanelLayout.setVerticalGroup(
topicButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(topicButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(topicButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(createEntryButton)
.addComponent(importEntryButton))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
add(topicButtonsPanel, java.awt.BorderLayout.PAGE_START);
topicTabCardsPanel.setLayout(new java.awt.CardLayout());
javax.swing.GroupLayout timelinePanelLayout = new javax.swing.GroupLayout(timelinePanel);
timelinePanel.setLayout(timelinePanelLayout);
timelinePanelLayout.setHorizontalGroup(
timelinePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 1275, Short.MAX_VALUE)
);
timelinePanelLayout.setVerticalGroup(
timelinePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 627, Short.MAX_VALUE)
);
topicTabCardsPanel.add(timelinePanel, "card2");
add(topicTabCardsPanel, java.awt.BorderLayout.CENTER);
}// </editor-fold>
private void createEntryButtonActionPerformed(java.awt.event.ActionEvent evt) {
EntryPanel entryPanel = new EntryPanel();
add(entryPanel);
CardLayout cards = (CardLayout) topicTabCardsPanel.getLayout();
cards.addLayoutComponent(entryPanel, "entryPanelCard");
cards.show(topicTabCardsPanel, "entryPanelCard");
}
// Variables declaration - do not modify
private javax.swing.JButton createEntryButton;
private javax.swing.JButton importEntryButton;
private Timeline.TimelinePanel timelinePanel;
private javax.swing.JPanel topicButtonsPanel;
private javax.swing.JPanel topicTabCardsPanel;
// End of variables declaration
}
public class EntryPanel extends javax.swing.JPanel {
/**
* Creates new form EntryViewPanel
*/
public EntryPanel() {
initComponents();
}
/**
* This method is called from within the constructor to initialise 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() {
createEntryDetails = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
entryTitleLabel = new javax.swing.JLabel();
entryDateLabel = new javax.swing.JLabel();
entryNotesLabel = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
entryNotesTextArea = new javax.swing.JTextArea();
entryDayTextField = new javax.swing.JTextField();
entryTitleTextField = new javax.swing.JTextField();
entryMonthTextField = new javax.swing.JTextField();
entryYearTextField = new javax.swing.JTextField();
newEntryDateBackslashLabel = new javax.swing.JLabel();
newEntryDateBackslashLabel1 = new javax.swing.JLabel();
sourceDetailsTabbedPane = new javax.swing.JTabbedPane();
addSourcePanel = new javax.swing.JPanel();
addSourceLabel = new javax.swing.JLabel();
buttonsPanel = new javax.swing.JPanel();
createEntryButtonsPanel = new javax.swing.JPanel();
createEntryButton = new javax.swing.JButton();
backButton = new javax.swing.JButton();
updateEntryButtonsPanel = new javax.swing.JPanel();
backButton1 = new javax.swing.JButton();
updateEntryButton = new javax.swing.JButton();
setMaximumSize(new java.awt.Dimension(1045, 591));
setMinimumSize(new java.awt.Dimension(1275, 672));
setPreferredSize(new java.awt.Dimension(1275, 672));
setLayout(new java.awt.BorderLayout());
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel2.setText("Enter new entry details:");
entryTitleLabel.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
entryTitleLabel.setText("Title:");
entryDateLabel.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
entryDateLabel.setText("Date (dd/mm/yy):");
entryNotesLabel.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
entryNotesLabel.setText("Notes:");
entryNotesTextArea.setColumns(20);
entryNotesTextArea.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
entryNotesTextArea.setRows(5);
jScrollPane2.setViewportView(entryNotesTextArea);
entryDayTextField.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
entryTitleTextField.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
entryMonthTextField.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
entryYearTextField.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
newEntryDateBackslashLabel.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
newEntryDateBackslashLabel.setText("/");
newEntryDateBackslashLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
newEntryDateBackslashLabel1.setText("/");
javax.swing.GroupLayout createEntryDetailsLayout = new javax.swing.GroupLayout(createEntryDetails);
createEntryDetails.setLayout(createEntryDetailsLayout);
createEntryDetailsLayout.setHorizontalGroup(
createEntryDetailsLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(createEntryDetailsLayout.createSequentialGroup()
.addContainerGap()
.addGroup(createEntryDetailsLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(createEntryDetailsLayout.createSequentialGroup()
.addComponent(entryTitleLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(69, 69, 69)
.addComponent(entryTitleTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 348, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(54, 54, 54)
.addComponent(entryDateLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(entryDayTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(newEntryDateBackslashLabel)
.addGap(9, 9, 9)
.addComponent(entryMonthTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(newEntryDateBackslashLabel1)
.addGap(10, 10, 10)
.addComponent(entryYearTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 241, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(createEntryDetailsLayout.createSequentialGroup()
.addGap(118, 118, 118)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 348, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(entryNotesLabel))
.addContainerGap(437, Short.MAX_VALUE))
);
createEntryDetailsLayout.setVerticalGroup(
createEntryDetailsLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(createEntryDetailsLayout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(createEntryDetailsLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(entryTitleLabel)
.addComponent(entryTitleTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(entryDateLabel)
.addComponent(entryDayTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(entryMonthTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(entryYearTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(newEntryDateBackslashLabel)
.addComponent(newEntryDateBackslashLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(createEntryDetailsLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(entryNotesLabel)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 9, Short.MAX_VALUE))
);
add(createEntryDetails, java.awt.BorderLayout.PAGE_START);
addSourceLabel.setFont(new java.awt.Font("Tahoma", 0, 24)); // NOI18N
addSourceLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
addSourceLabel.setText("Click here to add a new Source");
addSourceLabel.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
javax.swing.GroupLayout addSourcePanelLayout = new javax.swing.GroupLayout(addSourcePanel);
addSourcePanel.setLayout(addSourcePanelLayout);
addSourcePanelLayout.setHorizontalGroup(
addSourcePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(addSourcePanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(addSourceLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 1250, Short.MAX_VALUE)
.addContainerGap())
);
addSourcePanelLayout.setVerticalGroup(
addSourcePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(addSourcePanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(addSourceLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 437, Short.MAX_VALUE)
.addContainerGap())
);
addSourceLabel.getAccessibleContext().setAccessibleName("addSourcePanel");
sourceDetailsTabbedPane.addTab("add source", addSourcePanel);
add(sourceDetailsTabbedPane, java.awt.BorderLayout.CENTER);
sourceDetailsTabbedPane.getAccessibleContext().setAccessibleDescription("sourceDetailsTabbedPane");
buttonsPanel.setMaximumSize(new java.awt.Dimension(1045, 68));
buttonsPanel.setLayout(new java.awt.CardLayout());
createEntryButtonsPanel.setMaximumSize(new java.awt.Dimension(1045, 68));
createEntryButtonsPanel.setName("createEntryButtonsPanel");
createEntryButtonsPanel.setPreferredSize(new java.awt.Dimension(1045, 68));
createEntryButton.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
createEntryButton.setText("Create");
backButton.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
backButton.setText("Back");
javax.swing.GroupLayout createEntryButtonsPanelLayout = new javax.swing.GroupLayout(createEntryButtonsPanel);
createEntryButtonsPanel.setLayout(createEntryButtonsPanelLayout);
createEntryButtonsPanelLayout.setHorizontalGroup(
createEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(createEntryButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(backButton, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(createEntryButton, javax.swing.GroupLayout.PREFERRED_SIZE, 141, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(971, Short.MAX_VALUE))
);
createEntryButtonsPanelLayout.setVerticalGroup(
createEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(createEntryButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(createEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(backButton, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(createEntryButton, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(16, Short.MAX_VALUE))
);
buttonsPanel.add(createEntryButtonsPanel, "createEntryButtonsPanel");
updateEntryButtonsPanel.setMaximumSize(new java.awt.Dimension(1045, 68));
updateEntryButtonsPanel.setMinimumSize(new java.awt.Dimension(1045, 68));
updateEntryButtonsPanel.setName("updateEntryButtonsPanel");
updateEntryButtonsPanel.setPreferredSize(new java.awt.Dimension(1045, 68));
backButton1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
backButton1.setText("Back");
updateEntryButton.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
updateEntryButton.setText("Update");
javax.swing.GroupLayout updateEntryButtonsPanelLayout = new javax.swing.GroupLayout(updateEntryButtonsPanel);
updateEntryButtonsPanel.setLayout(updateEntryButtonsPanelLayout);
updateEntryButtonsPanelLayout.setHorizontalGroup(
updateEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(updateEntryButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(backButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(updateEntryButton, javax.swing.GroupLayout.PREFERRED_SIZE, 141, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(971, Short.MAX_VALUE))
);
updateEntryButtonsPanelLayout.setVerticalGroup(
updateEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(updateEntryButtonsPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(updateEntryButtonsPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(backButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(updateEntryButton, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(16, Short.MAX_VALUE))
);
buttonsPanel.add(updateEntryButtonsPanel, "updateEntryButtonsPanel");
add(buttonsPanel, java.awt.BorderLayout.PAGE_END);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JLabel addSourceLabel;
private javax.swing.JPanel addSourcePanel;
private javax.swing.JButton backButton;
private javax.swing.JButton backButton1;
private javax.swing.JPanel buttonsPanel;
private javax.swing.JButton createEntryButton;
private javax.swing.JPanel createEntryButtonsPanel;
private javax.swing.JPanel createEntryDetails;
private javax.swing.JLabel entryDateLabel;
private javax.swing.JTextField entryDayTextField;
private javax.swing.JTextField entryMonthTextField;
private javax.swing.JLabel entryNotesLabel;
private javax.swing.JTextArea entryNotesTextArea;
private javax.swing.JLabel entryTitleLabel;
private javax.swing.JTextField entryTitleTextField;
private javax.swing.JTextField entryYearTextField;
private javax.swing.JLabel jLabel2;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JLabel newEntryDateBackslashLabel;
private javax.swing.JLabel newEntryDateBackslashLabel1;
private javax.swing.JTabbedPane sourceDetailsTabbedPane;
private javax.swing.JButton updateEntryButton;
private javax.swing.JPanel updateEntryButtonsPanel;
// End of variables declaration
}
我使用NetBeans IDE 7.1.2和Java：1.7.0_04。
謝謝