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我glazedlists在 java 中使用 JComboBox 来使 JComboBox 可搜索和可排序。但是有些情况我无法解决。

我有一个JComboBox附件glazedlists。glazedlists 采用字符串数组填充此组合框并使其可像这样搜索

String[] Values = {"ABC", "DEF", "GHI", "JKL", "MNO"};
JComboBox cmb = new JComboBox();
AutoCompleteSupport.install(cmb , GlazedLists.eventListOf(Values));

这很好用，但问题是我想添加ID以及来自数据库的值，为此我正在实现我自己的自定义ListCellRenderer

class MyListRenderer extends JLabel implements ListCellRenderer 
{
    @Override
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
        Object[] itemData = (Object[])value;
        setText((String)itemData[1]);
        return this;
    }
}
cmb.setRenderer(new MyListRenderer());

为了在 JComboBox 中增加价值，我必须

while(rs.next()){
    int id=rs.getInt("company_id");
    String category=rs.getString("company_name");
    Object[] itemData = new Object[] {id, category};
    cmb.addItem(itemData);
}

现在如何在设置自己的自定义渲染器时实现我JComboBox的 with ？glazedlists

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1 回答 1

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你的方式没有任何成功，但我在早期的项目中找到了解决方案。您可以通过执行以下操作来设置 JComboBox 的模型：

//load the list of objects to use
ContainerClass[] allOptions = ContainerClass.getAll();

//create an EventList with this list and set is as the combobox model
final EventList<ContainerClass> eventList = GlazedLists.eventList(Arrays.asList(allOptions));
comboBox.setModel(new DefaultComboBoxModel<ContainerClass>(allOptions));

//finally initialize the combobox by SwingUtilities if done on a non-UI thread
SwingUtilities.invokeLater(new Runnable() {
    @Override
    public void run() {
        AutoCompleteSupport<ContainerClass> install = 
                AutoCompleteSupport.install(comboBox, eventList);
        install.setFilterMode(TextMatcherEditor.CONTAINS);
        install.setHidesPopupOnFocusLost(true);
        install.setSelectsTextOnFocusGain(false);
        install.setCorrectsCase(false);
    }
});

并使用 ContainerClass，例如：

class ContainerClass{
     int id;
     String company;

     //helper method to get all the objects needed
     static ContainerClass[] getAll(){
          ContainerClass test = new ContainerClass();
          test.id = 2;
          test.company = "abc";
          return new ContainerClass[]{test,test,test};
     }

     @Override
     //this String is what actually will be displayed in the combobox
     public String toString(){return "(" + id + ") " + company;}
}

我假设您的 JComboBox 具有以下类型：

JComboBox<ContainerClass> comboBox;

（我必须混淆所有变量的名称，因此代码中可能存在错误。请告诉我，我会更正它们）

所以回顾一下。GlazedLists 使用模型来获取名称，它再次向ContainerClass询问它的 toString() 方法，该方法将返回名称以显示在 JComboBox 中。

请注意，当您调用comboBox.getSelectedItem()时，它将返回ContainerClass类型的对象，如果不是有效选择，则返回 null。

更新

如果您希望能够控制顺序和名称，则需要为 ComboBox 实现自己的模型。发现这似乎很好地解释了它：

class MyComboBoxModel extends AbstractListModel implements ComboBoxModel {   
  String[] ComputerComps = { "Monitor", "Key Board", "Mouse", "Joy Stick", 
                 "Modem", "CD ROM", "RAM Chip", "Diskette" };

  String selection = null;

  public Object getElementAt(int index) {
    return ComputerComps[index];   
  }

  public int getSize() {
    return ComputerComps.length;   
  }

  public void setSelectedItem(Object anItem) {
    selection = (String) anItem; // to select and register an   
  } // item from the pull-down list

  // Methods implemented from the interface ComboBoxModel   
  public Object getSelectedItem() {
       return selection; // to add the selection to the combo box   
  } 
}
于 2014-10-10T17:10:58.563 回答