Swing/AutomaticallyCloseDialog の変更点

---
category: swing
folder: AutomaticallyCloseDialog
title: JOptionPaneを自動的に閉じる
tags: [JOptionPane, Timer, HierarchyListener, JLabel]
author: aterai
pubdate: 2013-09-02T00:27:47+09:00
description: JOptionPaneにカウントダウンと自動クローズを行うためのJLabelを追加します。
image: https://lh6.googleusercontent.com/-NvrpIdRXy8M/UiMOJmS8OMI/AAAAAAAABzg/6QK49B0s-NE/s800/AutomaticallyCloseDialog.png
---
* Summary [#summary]
`JOptionPane`にカウントダウンと自動クローズを行うための`JLabel`を追加します。

#download(https://lh6.googleusercontent.com/-NvrpIdRXy8M/UiMOJmS8OMI/AAAAAAAABzg/6QK49B0s-NE/s800/AutomaticallyCloseDialog.png)

* Source Code Examples [#sourcecode]
#code(link){{
label.addHierarchyListener(new HierarchyListener() {
  private Timer timer = null;
  private AtomicInteger atomicDown = new AtomicInteger(SECONDS);
  @Override public void hierarchyChanged(HierarchyEvent e) {
    JLabel l = (JLabel) e.getComponent();
    if ((e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
      if (l.isShowing()) {
        textArea.append("isShowing=true\n");
        atomicDown.set(SECONDS);
        l.setText(String.format("Closing in %d seconds", SECONDS));
        timer = new Timer(1000, new ActionListener() {
          // private int countdown = SECONDS;
          @Override public void actionPerformed(ActionEvent e) {
            // int i = --countdown;
            int i = atomicDown.decrementAndGet();
            l.setText(String.format("Closing in %d seconds", i));
            if (i <= 0) {
              Window w = SwingUtilities.getWindowAncestor(l);
              if (w != null && timer != null && timer.isRunning()) {
                textArea.append("Timer: timer.stop()\n");
                timer.stop();
                textArea.append("window.dispose()\n");
                w.dispose();
              }
            }
          }
        });
        timer.start();
      } else {
        textArea.append("isShowing=false\n");
        if (timer != null && timer.isRunning()) {
          textArea.append("timer.stop()\n");
          timer.stop();
          timer = null;
        }
      }
    }
  }
});
}}

* Description [#explanation]
* Description [#description]
- `java.awt.event.HierarchyListener`
-- `HierarchyListener`を使用して`JLabel`の表示状態の変化を監視
--- [[JOptionPaneのデフォルトフォーカス>Swing/OptionPaneDefaultFocus]]
- `javax.swing.Timer`
-- 親の`JOptionPane`が表示されて`JLabel#isShowing()`が`true`になったら`Timer#start()`でカウントダウンを開始
--- [[JComponentの表示状態>Swing/ShowingDisplayableVisible]]
-- 指定した時間が経過したら`Window#dispose()`メソッドを使用して親の`JOptionPane`を自動的に閉じる
--- `Window#dispose()`を使用するので`JOptionPane.showConfirmDialog(...)`の戻り値は`JOptionPane.CLOSED_OPTION`になる

* Reference [#reference]
- [[JComponentの表示状態>Swing/ShowingDisplayableVisible]]
- [[JOptionPaneのデフォルトフォーカス>Swing/OptionPaneDefaultFocus]]
- [https://stackoverflow.com/questions/10021969/java-how-to-continuously-update-jlabel-which-uses-atomicinteger-to-countdown-af swing - Java: How to continuously update JLabel which uses atomicInteger to countdown after ActionListener - Stack Overflow]

* Comment [#comment]
#comment
#comment