WuKongIMFlutterSDK/example/lib/popmenu_util.dart

import 'package:flutter/material.dart';

import 'popup_item.dart';

class PopmenuUtil {
  static Future showPopupMenu(BuildContext context,
      LongPressStartDetails details, List<PopupItem> items) {
    final List<PopupMenuItem> popupMenuItems = [];
    for (PopupItem item in items) {
      PopupMenuItem popupMenuItem = PopupMenuItem(
        // PopupMenuItem 的坑，默认为8，点击到边矩的地方会无反应
        padding: const EdgeInsets.all(0),
        onTap: item.onTap,
        child: Builder(builder: (context0) {
          // 这里需要使用 新的 context ，不然点击会无反应。
          // 区分现有的 context
          return GestureDetector(
            behavior: HitTestBehavior.opaque,
            child: Container(
              padding: const EdgeInsets.all(8.0),
              child: Text(
                item.text,
                style: const TextStyle(
                    color: Colors.black,
                    fontSize: 14,
                    fontWeight: FontWeight.bold),
              ),
            ),
          );
        }),
      );

      popupMenuItems.add(popupMenuItem);
    }

    RenderBox? renderBox =
        Overlay.of(context).context.findRenderObject() as RenderBox;

    // 表示位置（在画面边缘会自动调整位置）
    final RelativeRect position = RelativeRect.fromRect(
      Rect.fromLTRB(
        details.globalPosition.dx,
        details.globalPosition.dy,
        details.globalPosition.dx + 110, // 菜单显示位置X轴坐标
        details.globalPosition.dy - 40, // 菜单显示位置Y轴坐标
      ),
      Offset.zero & renderBox.size,
    );

    return showMenu(
        color: Colors.white,
        context: context,
        position: position,
        items: popupMenuItems,
        useRootNavigator: true);
  }
}