Swing/BorderSeparator のバックアップの現在との差分(No.4)

• バックアップ一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• バックアップ を表示
• Swing/BorderSeparator へ行く。

編集者:Terai Atsuhiro~

作成日:2005-09-20
更新日:2022-05-31 (火) 17:36:21

• category: swing folder: BorderSeparator title: JComboBoxのアイテムをBorderで修飾してグループ分け tags: [JComboBox, Border, ListCellRenderer, MatteBorder] author: aterai pubdate: 2005-09-19T09:10:06+09:00 description: JComboBoxのアイテムをBorderを使用して修飾してグループ分けします。 image:

概要

Screenshot

Download

• Runnable JAR example.jar
• Source code src.zip
• Repository GitHub

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#spanend
#spanadd
JComboBox combobox = new JComboBox();
#spanend
#spanadd
JSeparator sep = new JSeparator();
#spanend
#spanadd
ListCellRenderer lcr = combobox.getRenderer();
#spanend
#spanadd
combobox.setRenderer(new ListCellRenderer() {
#spanend
  @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 {
      label.setBorder(BorderFactory.createEmptyBorder());
    }
    return label;
  }
#spanadd
});
#spanend
#spanadd
DefaultComboBoxModel model = new DefaultComboBoxModel();
#spanend
#spanadd
model.addElement(new MyItem("aaaa"));
#spanend
#spanadd
model.addElement(new MyItem("eeeeeeeee", true));
#spanend
#spanadd
model.addElement(new MyItem("bbb12"));
#spanend
#spanadd
combobox.setModel(model);
#spanend
#spanadd
combobox.setEditable(true);
#spanend
#spanadd
// ...
#spanend

#spandel
[[プログラム板 Java低速GUI Swing 3>http://pc8.2ch.net/test/read.cgi/tech/1121700954/]]の229さんのアイデアを参考にしています。
#spanend
#spanadd
class MyItem {
#spanend
  private final String  item;
  private final boolean flag;
  public MyItem(String str) {
    this(str, false);
  }

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

#spandel
**サンプルコード [#x381b337]
#spanend
  @Override public String toString() {
    return item;
  }
#spanadd

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

• 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

     public class MainPanel extends JPanel{
       private final JComboBox combobox = new JComboBox();
       public MainPanel() {
         final JSeparator sep = new JSeparator();
         final ListCellRenderer lcr = combobox.getRenderer();
         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()) {
             label.setBorder(
                    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);
         
         setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
         add(new JTextField());
         add(Box.createVerticalStrut(5));
         add(combobox);
         add(Box.createRigidArea(new Dimension(320,5)));
         setBorder(BorderFactory.createEmptyBorder(5,5,0,5));
       }
       class MyItem{
         private final String  item;
         private final boolean flag;
         public MyItem(String str) {
           this(str,false);
         }
         public MyItem(String str, boolean flg) {
           item = str;
           flag = flg;
         }
         public String toString() {
           return item;
         }
         public boolean hasSeparator() {
           return flag;
         }
       }
     ......
    #spanadd
    combobox.setRenderer(new ListCellRenderer() {
    #spanend
      @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 {
          label.setBorder(BorderFactory.createEmptyBorder());
        }
        return label;
      }
    #spanadd
    });
    #spanend
    

• &jnlp;
• &jar;
• &zip;

• JComboBoxにJSeparatorを挿入
• JComboBox Items with Separators - Santhosh Kumar's Weblog

• プログラム板 Java低速GUI Swing 3
• JComboBoxにJSeparatorを挿入

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