マルチフォントのテキストエディタを作る(7ページ目)

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  // ＜Color＞メニュー用ActionListenerクラス
  class ColorMenuAction implements ActionListener {
    public void actionPerformed(ActionEvent ev) {
      String cmd = ev.getActionCommand();
      MutableAttributeSet attr = new SimpleAttributeSet();
      attr = setStyles(attr);
      Color c = null;
      try {
        Class cobj = ClassLoader.getSystemClassLoader().
            loadClass("java.awt.Color");
        Field field = cobj.getField(cmd);
        c = (Color)field.get(cobj);
      } catch (SecurityException e) {
        e.printStackTrace();
      } catch (IllegalArgumentException e) {
        e.printStackTrace();
      } catch (ClassNotFoundException e) {
        e.printStackTrace();
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      } catch (NoSuchFieldException e) {
        e.printStackTrace();
      }
      StyleConstants.setForeground(attr,c);
      StyledDocument doc = textpane.getStyledDocument();
      doc.setCharacterAttributes(selstart,selend - selstart,attr,true);
      textpane.select(selstart,selend);
    }
  }
}

// JFileChooser用FileFilterクラス
class MyRTFFilter extends FileFilter {

  public boolean accept(File f) {
    if (f.isDirectory()) {
      return true;
    }
    String fname = f.getName();
    int n = fname.lastIndexOf(".");
    String ext = fname.substring(n);
    ext = ext.toLowerCase();
    if (ext != null) {
      if (ext.equals(".rtf")){
        return true;
      } else {
          return false;
      }
    }
    return false;
  }

  public String getDescription() {
    return "RTF";
  }
}