Swing/BorderSeparator のバックアップの現在との差分(No.9)

JComboBoxのアイテムをBorderで修飾してグループ分け

概要

#screenshot

サンプルコード

#spanend
#spandel
final JComboBox combobox = new JComboBox();
#spanend
#spandel
final JSeparator sep = new JSeparator();
#spanend
#spandel
final ListCellRenderer lcr = combobox.getRenderer();
#spanend
#spanadd
* サンプルコード [#sourcecode]
#spanend
#spanadd
#code(link){{
#spanend
#spanadd
JComboBox combobox = new JComboBox();
#spanend
#spanadd
JSeparator sep = new JSeparator();
#spanend
#spanadd
ListCellRenderer lcr = combobox.getRenderer();
#spanend
combobox.setRenderer(new ListCellRenderer() {
  public Component getListCellRendererComponent(
               JList list, Object value, int index,
               boolean isSelected, boolean cellHasFocus) {
    MyItem item = (MyItem)value;
    JLabel label = (JLabel)lcr.getListCellRendererComponent(
                    list,item,index,isSelected,cellHasFocus);
    if(item.hasSeparator()) {
  @Override public Component getListCellRendererComponent(
        JList list, Object value, int index,
        boolean isSelected, boolean cellHasFocus) {
    MyItem item = (MyItem) value;
    JLabel label = (JLabel) lcr.getListCellRendererComponent(
        list, item, index, isSelected, cellHasFocus);
    if (item.hasSeparator()) {
      label.setBorder(
             BorderFactory.createMatteBorder(1,0,0,0,Color.GRAY));
    }else{
          BorderFactory.createMatteBorder(1, 0, 0, 0, Color.GRAY));
    } else {
      label.setBorder(BorderFactory.createEmptyBorder());
    }
    return label;
  }
});
DefaultComboBoxModel model = new DefaultComboBoxModel();
model.addElement(new MyItem("aaaa"));
model.addElement(new MyItem("eeeeeeeee", true));
model.addElement(new MyItem("bbb12"));
combobox.setModel(model);
combobox.setEditable(true);
#spandel

#spanend
#spandel
class MyItem{
#spanend
#spanadd
class MyItem {
#spanend
  private final String  item;
  private final boolean flag;
  public MyItem(String str) {
    this(str,false);
    this(str, false);
  }
#spanadd

#spanend
  public MyItem(String str, boolean flg) {
    item = str;
    flag = flg;
  }
  public String toString() {
#spanadd

#spanend
  @Override public String toString() {
    return item;
  }
#spanadd

#spanend
  public boolean hasSeparator() {
    return flag;
  }
}
#spandel
//......
#spanend
#spanadd
// ...
#spanend

• - コンボボックスが編集不可の場合は、JComboBox Items with Separators - Santhosh Kumar's Weblogのようにフィールド表示(index!=-1の場合)で区切りが表示されないようにする必要があります。

• JComboBoxが編集可
  • フィールド表示にはListCellRendererではなくJTextFieldが使用されるため、JComboBoxにJSeparatorを挿入する方法より簡単に区切りを表現可能
• JComboBoxが編集不可
  • JComboBox Items with Separators - Santhosh Kumar's Weblogのようにフィールド表示(index!=-1の場合)で区切りが表示されないようにする必要がある

    combobox.setRenderer(new ListCellRenderer() {
      public Component getListCellRendererComponent(
                   JList list, Object value, int index,
                   boolean isSelected, boolean cellHasFocus) {
        MyItem item = (MyItem)value;
        JLabel label = (JLabel)lcr.getListCellRendererComponent(
                        list,item,index,isSelected,cellHasFocus);
        if(index!=-1 && item.hasSeparator()) {
      @Override public Component getListCellRendererComponent(
            JList list, Object value, int index,
            boolean isSelected, boolean cellHasFocus) {
        MyItem item = (MyItem) value;
        JLabel label = (JLabel) lcr.getListCellRendererComponent(
            list, item, index, isSelected, cellHasFocus);
        if (index != -1 && item.hasSeparator()) {
          label.setBorder(
                 BorderFactory.createMatteBorder(1,0,0,0,Color.GRAY));
        }else{
              BorderFactory.createMatteBorder(1, 0, 0, 0, Color.GRAY));
        } else {
          label.setBorder(BorderFactory.createEmptyBorder());
        }
        return label;
      }
    });
    #spandel
    
    #spanend
    

• プログラム板 Java低速GUI Swing 3
• JComboBoxにJSeparatorを挿入
• JComboBox Items with Separators - Santhosh Kumar's Weblog

参考リンク

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