593     int key = WaitKey();  in CheckBackgroundTextImages()  local
594     if (key == static_cast<int>(KeyError::INTERRUPTED)) break;  in CheckBackgroundTextImages()
595     if (key == KEY_POWER || key == KEY_ENTER) {  in CheckBackgroundTextImages()
597     } else if (key == KEY_UP || key == KEY_VOLUMEUP) {  in CheckBackgroundTextImages()
600     } else if (key == KEY_DOWN || key == KEY_VOLUMEDOWN) {  in CheckBackgroundTextImages()
1132         int key = WaitKey();  in ShowFile()  local
1133         if (key == static_cast<int>(KeyError::INTERRUPTED)) return;  in ShowFile()
1134         if (key == KEY_POWER || key == KEY_ENTER) {  in ShowFile()
1136         } else if (key == KEY_UP || key == KEY_VOLUMEUP) {  in ShowFile()
1250     int key = WaitKey();  in ShowMenu()  local
1251     if (key == static_cast<int>(KeyError::INTERRUPTED)) {  // WaitKey() was interrupted.  in ShowMenu()
1254     if (key == static_cast<int>(KeyError::TIMED_OUT)) {  // WaitKey() timed out.  in ShowMenu()
1266     int action = key_handler(key, visible);  in ShowMenu()