Swing/TabWithCloseButton の変更点

---
category: swing
folder: TabWithCloseButton
title: JTabbedPaneにタブを閉じるボタンを追加
tags: [JTabbedPane, JButton]
author: aterai
pubdate: 2007-01-29T16:15:06+09:00
description: JDK 6の新機能を使用し、JTabbedPaneのタブ内に自身を閉じるためのボタンを追加します。
image: https://lh6.googleusercontent.com/_9Z4BYR88imo/TQTVCzHeo0I/AAAAAAAAAnA/hnMCEbHXnnw/s800/TabWithCloseButton.png
---
* Summary [#summary]
`JDK 6`の新機能を使用し、`JTabbedPane`のタブ内に自身を閉じるためのボタンを追加します。

#download(https://lh6.googleusercontent.com/_9Z4BYR88imo/TQTVCzHeo0I/AAAAAAAAAnA/hnMCEbHXnnw/s800/TabWithCloseButton.png)

* Source Code Examples [#sourcecode]
#code(link){{
class CloseButtonTabbedPane extends JTabbedPane {
  private final Icon icon;
  private final Dimension buttonSize;
  public CloseButtonTabbedPane(Icon icon) {
    super();
    // icon = new CloseTabIcon();
    this.icon = icon;
    buttonSize = new Dimension(icon.getIconWidth(), icon.getIconHeight());
  }

  @Override public void addTab(String title, final JComponent content) {
    JPanel tab = new JPanel(new BorderLayout());
    tab.setOpaque(false);
    JLabel label = new JLabel(title);
    label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 4));
    JButton button = new JButton(icon);
    button.setPreferredSize(buttonSize);
    button.addActionListener(new ActionListener() {
      @Override public void actionPerformed(ActionEvent e) {
        removeTabAt(indexOfComponent(content));
      }
    });
    tab.add(label,  BorderLayout.WEST);
    tab.add(button, BorderLayout.EAST);
    tab.setBorder(BorderFactory.createEmptyBorder(2, 1, 1, 1));
    super.addTab(null, content);
    setTabComponentAt(getTabCount() - 1, tab);
  }
}
}}

* Description [#explanation]
* Description [#description]
- `JDK 6`で追加された[https://docs.oracle.com/javase/jp/8/docs/api/javax/swing/JTabbedPane.html#setTabComponentAt-int-java.awt.Component- JTabbedPane#setTabComponentAt(...)]メソッドを使用して、指定したタブ内に`JButton`を配置
-- `JButton`に`ActionListener`を追加し、クリックで`JTabbedPane#removeTabAt(...)`を実行してタブを削除
- [[以前のサンプル>Swing/TabWithCloseIcon]]に比べると実装も簡単でコードも短くなる

* Reference [#reference]
- [http://www.oracle.com/technetwork/articles/javase/index-135776.html More Enhancements in Java SE 6]
- [https://docs.oracle.com/javase/tutorial/uiswing/components/tabbedpane.html How to Use Tabbed Panes (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)]
- [https://docs.oracle.com/javase/jp/8/docs/api/javax/swing/JTabbedPane.html#setTabComponentAt-int-java.awt.Component- JTabbedPane#setTabComponentAt(...) (Java Platform SE 8)]
- [[JTabbedPaneにタブを閉じるアイコンを追加>Swing/TabWithCloseIcon]]
- [[JTabbedPaneのTabTitleを左揃えに変更>Swing/TabTitleAlignment]]

* Comment [#comment]
#comment
#comment