使用GridBagLayout將JScrollBar添加到JPanel

Question

我的整個目的是使事情看起來像這樣：

IMG http://img221.imageshack.us/img221/1294/jscrollbaruselessf.png

我希望技能列表的滾動類似於凍結Excel中電子表格的第一行。

這是我第一行的代碼。

    //#### Skills frame start ####
    skillsFrame = new JInternalFrame("Skills", true, true, false, false);
    skillsFrame.setLayout(new BorderLayout());
    skillsFrame.setLocation(Integer.parseInt(configFile.getProperty("SKILLS_FRAME_COORDINATE_X")), 
            Integer.parseInt(configFile.getProperty("SKILLS_FRAME_COORDINATE_Y")));
    skillsFrame.setSize(Integer.parseInt(configFile.getProperty("SKILLS_FRAME_SIZE_X")), 
            Integer.parseInt(configFile.getProperty("SKILLS_FRAME_SIZE_Y")));
    skillsPanelHeader = new JPanel();
    skillsPanelContent = new JPanel();
    //skillsPanelScrollPane = new JScrollPane();
    //skillsPanelScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    //skillsPanelScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

    GridBagLayout gridBagLayout = new GridBagLayout();
    gridBagLayout.columnWidths = new int[]{0, 110, 200, 45, 17};
    gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0};
    gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0};
    gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
    skillsPanelHeader.setLayout(gridBagLayout);
    skillsPanelContent.setLayout(gridBagLayout);

    JLabel lblImage = new JLabel("Icon");
    lblImage.setFont(new Font("Tahoma", Font.BOLD, 14));
    GridBagConstraints gbc_lblImage = new GridBagConstraints();
    gbc_lblImage.insets = new Insets(0, 0, 5, 5);
    gbc_lblImage.gridx = 0;
    gbc_lblImage.gridy = 0;
    skillsPanelHeader.add(lblImage, gbc_lblImage);

    JLabel lblSkills = new JLabel("Skills");
    lblSkills.setFont(new Font("Tahoma", Font.BOLD, 14));
    GridBagConstraints gbc_lblSkills = new GridBagConstraints();
    gbc_lblSkills.gridx = 1;
    gbc_lblSkills.insets = new Insets(0, 0, 5, 5);
    gbc_lblSkills.gridy = 0;
    skillsPanelHeader.add(lblSkills, gbc_lblSkills);

    JLabel lblExp = new JLabel("Exp");
    lblExp.setFont(new Font("Tahoma", Font.BOLD, 14));
    GridBagConstraints gbc_lblExp = new GridBagConstraints();
    gbc_lblExp.insets = new Insets(0, 0, 5, 5);
    gbc_lblExp.gridx = 2;
    gbc_lblExp.gridy = 0;
    skillsPanelHeader.add(lblExp, gbc_lblExp);

    JLabel lblLevel = new JLabel("Level");
    lblLevel.setFont(new Font("Tahoma", Font.BOLD, 14));
    GridBagConstraints gbc_lblLevel = new GridBagConstraints();
    gbc_lblLevel.insets = new Insets(0, 0, 5, 0);
    gbc_lblLevel.gridx = 3;
    gbc_lblLevel.gridy = 0;
    skillsPanelHeader.add(lblLevel, gbc_lblLevel);

    JSeparator separator = new JSeparator();
    GridBagConstraints gbc_separator = new GridBagConstraints();
    gbc_separator.fill = GridBagConstraints.HORIZONTAL;
    gbc_separator.gridwidth = 4;
    gbc_separator.insets = new Insets(0, 0, 5, 0);
    gbc_separator.gridx = 0;
    gbc_separator.gridy = 1;
    skillsPanelHeader.add(separator, gbc_separator);

    skillsFrame.setMinimumSize(new Dimension(425,500));
    skillsFrame.setVisible(false);
    skillsFrame.getContentPane().add(skillsPanelHeader, BorderLayout.NORTH);
    panel.add(skillsFrame);
    //#### Skills frame end ####

這是用於解析（commandString-服務器/數據庫的技能回復）的代碼

String SkillsList[] = commandString.split("\\|");
//TODO:: make the painting not keep getting darker and darker
for (int i = 0; i < SkillsList.length; i = i+3){
    JLabel label = new JLabel("");
    label.setIcon(new ImageIcon(SkillsList[i]));
    GridBagConstraints gbc_label = new GridBagConstraints();
    gbc_label.insets = new Insets(0, 0, 5, 5);
    gbc_label.gridx = 0;
    gbc_label.gridy = i+2;
    skillsPanelContent.add(label, gbc_label);

    JLabel lblNewLabel = new JLabel(SkillsList[i+1]);
    GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
    gbc_lblNewLabel.insets = new Insets(0, 0, 5, 5);
    gbc_lblNewLabel.gridx = 1;
    gbc_lblNewLabel.gridy = i+2;
    skillsPanelContent.add(lblNewLabel, gbc_lblNewLabel);

    JProgressBar progressBar_1 = new JProgressBar();
    progressBar_1.setStringPainted(true);
    progressBar_1.setString(SkillsList[i+2] + "/");
    GridBagConstraints gbc_progressBar_1 = new GridBagConstraints();
    gbc_progressBar_1.fill = GridBagConstraints.HORIZONTAL;
    gbc_progressBar_1.insets = new Insets(0, 0, 5, 5);
    gbc_progressBar_1.gridx = 2;
    gbc_progressBar_1.gridy = i+2;
    skillsPanelContent.add(progressBar_1, gbc_progressBar_1);

    JLabel label_1 = new JLabel("1");
    GridBagConstraints gbc_label_1 = new GridBagConstraints();
    gbc_label_1.insets = new Insets(0, 0, 5, 0);
    gbc_label_1.gridx = 3;
    gbc_label_1.gridy = i+2;
    skillsPanelContent.add(label_1, gbc_label_1);

    if (i == SkillsList.length-3){
            JScrollBar scrollbar = new JScrollBar();
            GridBagConstraints gbc_scrollbar = new GridBagConstraints();
            gbc_scrollbar.insets = new Insets(0, 0, 5, 0);
            gbc_scrollbar.gridx = 4;
            gbc_scrollbar.gridy = 2;
            gbc_scrollbar.fill = GridBagConstraints.BOTH;
            gbc_scrollbar.gridheight = i;
            skillsPanelContent.add(scrollbar, gbc_scrollbar);
     }
}
skillsFrame.getContentPane().add(skillsPanelContent, BorderLayout.CENTER);
System.out.println(commandString);

如您所見，它完美地添加了所有內容，但scrollbbar並未連接任何東西。 我為此感到無所適從。 我嘗試通過向其添加skillPanelContent來使用JScrollPane，無論我做什么，它都不會顯示。

任何建議或幫助將不勝感激。 我希望我可以根據需要將其保留為短（代碼）。 如果可以提供其他任何幫助，請讓我。 謝謝。

Answer 1

為什么不在contentPanel周圍添加JScrollPane ：

skillsFrame.getContentPane().add(new JScrollPane(skillsPanelContent), BorderLayout.CENTER);

當然，請刪除滾動條。 您可能還需要通過將horizo​​ntalScrollBarPolicy設置為ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER值來禁用它： setHorizontalScrollBarPolicy(int policy)

Answer 2

為了使標題始終位於頂部，您需要拉出標題並將其放在單獨的組件中或置於邊框中。 然后將剩余的日期放在JPanel中，然后執行JScr​​ollPane myScroller = new JScrollPane（myPanel），然后將horizo​​ntalscrollbarpolicy設置為NEVER。

使標題與列保持一致可能有點棘手，但是我建議嘗試擴展Border並引用GridBagLayout來獲取列位置。