Question

我正在尝试在java中创建一个GUI，其中包含一个JComboBox和JList，其内容根据JComboBox中的选定项而变化。

我想将一个scroolPane添加到JList中。我将向您展示代码和图像，以澄清问题：

JPanel listPanel = new JPanel();

Hashtable<String, String[]> subItems = new Hashtable<String, String[]>();
JComboBox<String> tendina;
JList<String> subList;

GridBagConstraints c;

String ricevuti[] = {"Alex", "Ben", "Claire", "Dana", "Ellen", "Felicia", "Gary", "Hailey", "Imogen", "Jay", "Kate", "Alex", "Ben", "Claire", "Dana", "Ellen", "Felicia", "Gary", "Hailey", "Imogen", "Jay", "Kate"};
JList ricList = new JList(ricevuti);

String inviati[] = {"Lara", "Megan", "Nikole", "Oscar", "Paige", "Quentin", "Ralph", "Sara", "Thelma", "Victoria", "William"};
JList invList = new JList(inviati);

String ricInv[] = {"Seleziona un item..", "Ricevuti", "Inviati"};

Inbox() {

    //...

    listPanel.setLayout(new GridBagLayout()); 
    listPanel.setBackground(Color.BLUE);

    /*** ComboBox ***/
    tendina = new JComboBox<String>(ricInv);
    tendina.addActionListener(this);
    tendina.setEditable(false);
    c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = 1;
    c.gridx = 0;
    c.gridy = 0;
    c.insets = new Insets(-295, 10, 0, 0); //top, left, bottom, right
    c.weightx = 1;
    listPanel.add(tendina, c);

    /*** Lista ***/
    subList = new JList<String>();
    subList.setPreferredSize(new Dimension(80, 280)); 
    subList.setVisibleRowCount(10);
    subList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane scrollList = new JScrollPane(subList);
    subItems.put(ricInv[1], ricevuti);
    subItems.put(ricInv[2], inviati);
    c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = 1;
    c.gridx = 0;
    c.gridy = 0;
    c.insets = new Insets(30, 10, 0, 0); //top, left, bottom, right
    c.weightx = 1;
    **[1]**listPanel.add(subList, c);
    **[2]**listPanel.add(scrollList, c);

    //...

}

问题在于，当我将scrollList [2]添加到listPanel时，布局混乱了。如果我将子列表[1]添加到listPanel，那么布局是正确的，但显然我没有scrollList。

如何在不更改布局的情况下添加scrollList？

如果我将subList添加到listPanel [1]会发生这种情况： http://www.mediafire.com/view/daye4rkx1tyhwbq/sublist.png

如果我将scrollList添加到listPanel [2]会发生这种情况： http://www.mediafire.com/view/jfiky6j686e2h58/scroll.png

由于

关于身高，我意识到这个问题取决于subList.setVisibleRowCount(16);。

但我怎样才能调整宽度？

Answer 1

这不是我上次发布时给你的建议：http://docs.oracle.com/javase/tutorial/uiswing/events/documentlistener.html

包含JList的JScrollPane应该从一开始就使用您想要的布局添加到GUI中。

然后，您只需使用setModel(...)方法更改JList中的数据。

更改将JScrollList添加到JList的布局

1 个答案: