getLeft method
Get the left position of the widget
Implementation
double getLeft() {
final box = key!.currentContext!.findRenderObject() as RenderBox;
final boxOffset = box.localToGlobal(const Offset(0.0, 0.0));
if (boxOffset.dx.isNaN) return 0 - padding.left;
final topLeft = box.size.topLeft(boxOffset);
return topLeft.dx - padding.left;
}