Swing/ComboBoxItemCopy の変更点

---
category: swing
folder: ComboBoxItemCopy
title: JComboBoxのItemをキー入力やJPopupMenuでコピーする
tags: [JComboBox, JPopupMenu, ActionMap, InputMap]
author: aterai
pubdate: 2018-11-19T16:40:06+09:00
description: JComboBoxのItemをキー入力やJPopupMenuを使用してコピーします。
image: https://drive.google.com/uc?id=1NdGJia5hxUObZKEOuG1aS83TzDZvfjOpXQ
---
* 概要 [#summary]
`JComboBox`の`Item`をキー入力や`JPopupMenu`を使用してコピーします。

#download(https://drive.google.com/uc?id=1NdGJia5hxUObZKEOuG1aS83TzDZvfjOpXQ)

* サンプルコード [#sourcecode]
#code(link){{
JComboBox<String> combo1 = new JComboBox<>(makeModel(5));
Action copy = new AbstractAction() {
  @Override public void actionPerformed(ActionEvent e) {
    JComboBox<?> combo = (JComboBox<?>) e.getSource();
    Optional.ofNullable(combo.getSelectedItem()).ifPresent(text -> {
      Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
      Transferable contents = new StringSelection(Objects.toString(text));
      clipboard.setContents(contents, null);
      System.out.println(text);
    });
  }
};
ActionMap am = combo1.getActionMap();
am.put(COPY_KEY, copy);
int modifiers = InputEvent.CTRL_DOWN_MASK;
KeyStroke keyStroke = KeyStroke.getKeyStroke(KeyEvent.VK_C, modifiers);
InputMap im = combo1.getInputMap(JComponent.WHEN_FOCUSED);
im.put(keyStroke, COPY_KEY);

JPopupMenu popup = new JPopupMenu();
popup.add(COPY_KEY).addActionListener(e -> {
  Object o = popup.getInvoker();
  Container c = o instanceof JComboBox ? (Container) o
  Container c = o instanceof JComboBox
    ? (Container) o
    : SwingUtilities.getAncestorOfClass(JComboBox.class, (Component) o);
  if (c instanceof JComboBox) {
    JComboBox<?> combo = (JComboBox<?>) c;
    Action a = combo.getActionMap().get(COPY_KEY);
    a.actionPerformed(new ActionEvent(combo, e.getID(), e.getActionCommand()));
    // KeyEvent keyEvent = new KeyEvent(combo, 0, 0, 0, 0, 'C');
    // SwingUtilities.notifyAction(a, keyStroke, keyEvent, combo, modifiers);
  }
});
combo1.setComponentPopupMenu(popup);
}}

* 解説 [#explanation]
- `Default:`
-- デフォルトでは編集不可の`JComboBox`にKBD{Ctrl+C}などのキー入力でのコピー機能はない
- `Editable: false, JPopupMenu, Ctrl+C`
-- 編集不可の`JComboBox`に`ActionMap`と`InputMap`を使用してKBD{Ctrl+C}キーで現在選択中のアイテム文字列をコピー可能に設定
-- `JComboBox#setComponentPopupMenu(...)`で`ActionMap`に追加したコピーイベントを呼び出せるよう設定
--- `JComboBox`のボタン上で`JPopupMenu`を呼び出すと`JPopupMenu#getInvoker()`で`JButton`が返るので注意が必要
- `Editable: true, JPopupMenu, Ctrl+C`
-- `JComboBox#getEditor().getEditorComponent()`で取得した`JTextField`に`JTextField#setComponentPopupMenu(...)`でコピーなどを実行する`JPopupMenu`を設定
-- `JTextField`はデフォルトでKBD{Ctrl+C}キーなどでのコピーが可能

* 参考リンク [#reference]
- [https://stackoverflow.com/questions/52731102/copy-text-in-combo-box-java swing - Copy text in combo-box Java - Stack Overflow]
- [[DefaultEditorKitでポップアップメニューからコピー>Swing/DefaultEditorKit]]
- [[JPopupMenuを開く前に対象となるJTextFieldにFocusを移動する>Swing/FocusBeforePopup]]

* コメント [#comment]
#comment
#comment