Method check

source/windowing/StarButtonWidget.cpp:265–278

}

void ButtonWidget::check() {
  if (m_checkable) {
    // If we are part of an exclusive button group, then don't uncheck if
    // we are already checked and pressed again.
    if (m_buttonGroup) {
      if (m_buttonGroup->toggle() || !isChecked()) {
        setChecked(!m_buttonGroup->toggle() || !isChecked());
        m_buttonGroup->wasChecked(this);
      }
    } else {
      setChecked(!isChecked());
    }
  }
}

bool ButtonWidget::sustainCallbackOnDownHold() {
  return m_sustain;