fcs/lib/pages/widgets/local_popup_menu_button.dart

import 'package:fcs/helpers/theme.dart';
import 'package:fcs/pages/widgets/local_text.dart';
import 'package:flutter/material.dart';

import 'local_popupmenu.dart';

typedef PopupMenuCallback = Function(LocalPopupMenu popupMenu);

class LocalPopupMenuButton extends StatefulWidget {
  final PopupMenuCallback popupMenuCallback;
  final List<LocalPopupMenu> popmenus;
  final bool multiSelect;
  final bool selectable;
  final IconData buttonIcon;
  final Color buttonColor;

  const LocalPopupMenuButton(
      {Key key,
      this.popupMenuCallback,
      this.popmenus,
      this.buttonIcon,
      this.selectable = true,
      this.multiSelect = false,
      this.buttonColor = primaryColor})
      : super(key: key);

  @override
  _LocalPopupMenuButtonState createState() => _LocalPopupMenuButtonState();
}

class _LocalPopupMenuButtonState extends State<LocalPopupMenuButton> {
  List<LocalPopupMenu> popmenus;

  @override
  void initState() {
    popmenus = widget.popmenus;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    bool hightlight = _needHighlight();
    return PopupMenuButton<LocalPopupMenu>(
        elevation: 3.2,
        onSelected: (selected) {
          if (widget.selectable) {
            if (!widget.multiSelect) {
              setState(() {
                popmenus.forEach((e) {
                  if (e.id != selected.id)
                    e.selected = false;
                  else
                    e.selected = true;
                });
              });
              selected.selected = true;
            } else {
              setState(() {
                popmenus.forEach((e) {
                  if (e.id == selected.id) e.selected = !e.selected;
                });
              });
              selected.selected = !selected.selected;
            }
          }
          if (selected.enabled && widget.popupMenuCallback != null)
            widget.popupMenuCallback(selected);
        },
        icon: Container(
            width: 30,
            height: 30,
            decoration: new BoxDecoration(
              shape: BoxShape.circle,
              color: Colors.white,
            ),
            child: Stack(
              fit: StackFit.expand,
              children: <Widget>[
                Icon(
                  widget.buttonIcon ?? Icons.filter_list,
                  color: widget.buttonColor ?? primaryColor,
                ),
                hightlight
                    ? Positioned(
                        bottom: 0,
                        right: 0,
                        child: Container(
                          width: 10,
                          height: 10,
                          decoration: new BoxDecoration(
                            shape: BoxShape.circle,
                            color: secondaryColor,
                          ),
                        ),
                      )
                    : Container()
              ],
            )),
        itemBuilder: (BuildContext context) {
          return popmenus.map((LocalPopupMenu choice) {
            if (choice == null) return null;
            return PopupMenuItem<LocalPopupMenu>(
              value: choice,
              child: Row(
                children: <Widget>[
                  LocalText(context, choice.textKey,
                      color:
                          choice?.enabled ?? true ? primaryColor : Colors.grey),
                  SizedBox(
                    width: 10,
                  ),
                  choice.selected
                      ? Icon(
                          Icons.check,
                          color: Colors.grey,
                        )
                      : Container(),
                ],
              ),
            );
          }).toList();
        });
  }

  bool _needHighlight() {
    popmenus.forEach((e) {
      if (e == null) return false;
      if (e.selected && e.highlight) return true;
    });
    return false;
  }
}