WidgetUtil.dart

/*
 * @author lsy
 * @date   2020/5/14
 **/
import 'package:flutter/material.dart';

class WidgetUtil {
  static RelativeRect buttonMenuPosition(BuildContext c) {
    final RenderBox bar = c.findRenderObject();
    final RenderBox overlay = Overlay.of(c).context.findRenderObject();
    final RelativeRect position = RelativeRect.fromRect(
      Rect.fromPoints(
        bar.localToGlobal(bar.size.bottomRight(Offset.zero), ancestor: overlay),
        bar.localToGlobal(bar.size.bottomRight(Offset.zero), ancestor: overlay),
      ),
      Offset.zero & overlay.size,
    );
    return position;
  }

  static RelativeRect buttonLeftMenuPosition(BuildContext c) {
    final RenderBox bar = c.findRenderObject();
    final RenderBox overlay = Overlay.of(c).context.findRenderObject();
    final RelativeRect position = RelativeRect.fromRect(
      Rect.fromPoints(
        bar.localToGlobal(bar.size.bottomLeft(Offset.zero), ancestor: overlay),
        bar.localToGlobal(bar.size.bottomLeft(Offset.zero), ancestor: overlay),
      ),
      Offset.zero & overlay.size,
    );
    return position;
  }
}