private void _applyFontStyleForSelection(Font font) {
    StyledDocument doc = mTextEditor.getStyledDocument();
    MutableAttributeSet attrs = mTextEditor.getInputAttributes();
    StyleConstants.setFontFamily(attrs, font.getFamily());
    StyleConstants.setFontSize(attrs, font.getSize());
    StyleConstants.setBold(attrs, ((font.getStyle() & Font.BOLD) != 0));
    StyleConstants.setItalic(attrs, ((font.getStyle() & Font.ITALIC) != 0));
    StyleConstants.setUnderline(attrs, ((font.getStyle() & Font.CENTER_BASELINE) != 0));

    int start = mTextEditor.getSelectionStart();
    int end = mTextEditor.getSelectionEnd();
    doc.setCharacterAttributes(start, (end - start), attrs, false);
  }
  private void applyFontSize() {
    Document document = myEditorPane.getDocument();
    if (!(document instanceof StyledDocument)) {
      return;
    }

    StyledDocument styledDocument = (StyledDocument) document;
    if (myFontSizeStyle == null) {
      myFontSizeStyle = styledDocument.addStyle("active", null);
    }

    EditorColorsManager colorsManager = EditorColorsManager.getInstance();
    EditorColorsScheme scheme = colorsManager.getGlobalScheme();
    StyleConstants.setFontSize(myFontSizeStyle, scheme.getQuickDocFontSize().getSize());
    if (Registry.is("documentation.component.editor.font")) {
      StyleConstants.setFontFamily(myFontSizeStyle, scheme.getEditorFontName());
    }
    styledDocument.setCharacterAttributes(0, document.getLength(), myFontSizeStyle, false);
  }