Swing/FirstCharToUpperCase のバックアップの現在との差分(No.1)

DocumentFilterで先頭文字を大文字に変換する

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サンプルコード

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class FirstCharToUpperCaseDocumentFilter extends  {
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* サンプルコード [#sourcecode]
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#code(link){{
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class FirstCharToUpperCaseDocumentFilter extends DocumentFilter {
  private final JTextComponent textArea;
  public FirstCharToUpperCaseDocumentFilter(JTextComponent textArea) {
  private final JTextComponent textField;
  protected FirstCharToUpperCaseDocumentFilter(JTextComponent textField) {
    super();
    this.textArea = textArea;
    this.textField = textField;
  }
  @Override
  public void insertString(FilterBypass fb, int offset, String text, AttributeSet attrs)
        throws BadLocationException {
    if(text==null) return;
    replace(fb, offset, 0, text, attrs);
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  @Override public void remove(
      DocumentFilter.FilterBypass fb, int offset, int length)
      throws BadLocationException {
    Document doc = fb.getDocument();
    if (offset == 0 && doc.getLength() - length > 0) {
      fb.replace(length, 1,
                 doc.getText(length, 1).toUpperCase(Locale.ENGLISH), null);
      textField.setCaretPosition(offset);
    }
    fb.remove(offset, length);
  }
  @Override
  public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
     Document doc = fb.getDocument();
     if(offset==0 && doc.getLength()-length>0) {
       fb.replace(0, length+1, doc.getText(length, 1).toUpperCase(), null);
       textArea.setCaretPosition(0);
     } else {
       fb.remove(offset, length);
     }
   }
  @Override
  public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs)
        throws BadLocationException {
     if(offset==0 && text!=null && text.length()>0) {
       text = text.substring(0,1).toUpperCase()+text.substring(1);
     }
     fb.replace(offset, length, text, attrs);
   }
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  @Override public void replace(
        DocumentFilter.FilterBypass fb, int offset, int length,
        String text, AttributeSet attrs) throws BadLocationException {
    String str = text;
    if (offset == 0 && Objects.nonNull(text) && !text.isEmpty()) {
      str = text.substring(0, 1).toUpperCase(Locale.ENGLISH) + text.substring(1);
    }
    fb.replace(offset, length, str, attrs);
  }
}

• JFormattedTextField + MaskFormatterを使用すると指定した文字列長に足りない場合などでアンドゥが実行される

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  field1 = new JFormattedTextField(new MaskFormatter("ULLLLLLLLLL"));
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