带行分隔的 Java 列表

Question

嘿，我如何使我的 java SWT 列表看起来像这里 http://flavio.tordini.org/minitunes我的意思是每个元素彼此之间用一条线分隔。或者我有任何其他解决方案可以像迷你曲中那样有一个列表，这样我就可以添加数字..等等。

Answer 1

您应该使用 ListCellRenderer 在特定位置添加分隔符...

 jList1 = new javax.swing.JList();
//String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
jList1.setModel(new javax.swing.AbstractListModel() {
    String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
    Vector v = makeVectorData(strings);
    public int getSize() { return v.size(); }
    public Object getElementAt(int i) { return v.get(i); }
});
jList1.setCellRenderer(new JlistRenderer());
jList1.addFocusListener(new JListFocusListener(jList1));<p></p>

<p>public class JlistRenderer extends JLabel implements ListCellRenderer {
    JSeparator separator;
    final String SEPARATOR = "SEPARATOR";
    public JlistRenderer() {
      setOpaque(true);
      setBorder(new EmptyBorder(1, 1, 1, 1));
      separator = new JSeparator(JSeparator.HORIZONTAL);
    }
    public Component getListCellRendererComponent(JList list, Object value,
        int index, boolean isSelected, boolean cellHasFocus) {
      String str = (value == null) ? "" : value.toString();
      if (SEPARATOR.equals(str)) {
        return separator;
      }
      if (isSelected) {
        setBackground(list.getSelectionBackground());
        setForeground(list.getSelectionForeground());
      } else {
        setBackground(list.getBackground());
        setForeground(list.getForeground());
      }
      setFont(list.getFont());
      setText(str);
      return this;
    }
}</p>

<p>public class JListFocusListener implements FocusListener {
     JList list;
    Object currentItem;
    final String SEPARATOR = "SEPARATOR";
    JListFocusListener(JList list) {
      this.list= list;
      list.setSelectedIndex(0);
      currentItem = list.getSelectedValue();
    }
    public void focusGained(FocusEvent e) {
      String tempItem = (String) list.getSelectedValue();
      if (SEPARATOR.equals(tempItem)) {
        list.setSelectedValue(currentItem,true);
      } else {
        currentItem = tempItem;
      }
    }
}
</p>

希望上面的代码有帮助...