grabbing property

MouseCursor get grabbing

构建抓握样式，手指闭合

Implementation

static MouseCursor get grabbing {
  if (kIsWeb) return SystemMouseCursors.grabbing;
  if (ElPlatform.isWindows) {
    return SystemMouseCursors.click;
  } else {
    return SystemMouseCursors.grabbing;
  }
}