使用 Dropdown_button2 包不适用于 Flutter 中的卡片视图

Question

我想制作一个 SVG 图标，我必须在此卡片上显示一个下拉菜单。我正在使用 Dropdown_button2 包。 https://pub.dev/packages/dropdown_button2

我能够让下拉按钮独立工作。

我是这样做的

import 'package:flutter/material.dart';
import 'package:dropdown_button2/dropdown_button2.dart';
import 'package:flutter_svg/svg.dart';

class CustomButtonTest extends StatefulWidget {
  const CustomButtonTest({Key? key}) : super(key: key);

  @override
  State<CustomButtonTest> createState() => _CustomButtonTestState();
}

class _CustomButtonTestState extends State<CustomButtonTest> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          DropdownButtonHideUnderline(
            child: DropdownButton2(
              customButton: SvgPicture.asset(
                'assets/threedots.svg',
                height: 30,
                width: 30,
              ),
              customItemsIndexes: const [4],
              customItemsHeight: 8,
              items: [
                ...MenuItems.firstItems.map(
                  (item) => DropdownMenuItem<MenuItem>(
                    value: item,
                    child: MenuItems.buildItem(item),
                  ),
                ),
              ],
              onChanged: (value) {
                MenuItems.onChanged(context, value as MenuItem);
              },
              itemHeight: 40,
              itemPadding: const EdgeInsets.only(left: 16, right: 16),
              dropdownWidth: 160,
              dropdownPadding: const EdgeInsets.symmetric(vertical: 6),
              dropdownDecoration: BoxDecoration(
                borderRadius: BorderRadius.circular(4),
                color: Colors.black87,
              ),
              dropdownElevation: 8,
              offset: const Offset(0, 8),
            ),
          ),
        ],
      ),
    );
  }
}

class MenuItem {
  final String text;
  final IconData icon;

  const MenuItem({
    required this.text,
    required this.icon,
  });
}

class MenuItems {
  static const List<MenuItem> firstItems = [
    profilepic,
    coverpic,
    nametag,
    aboutme
  ];

  static const profilepic =
      MenuItem(text: 'Profile Picture', icon: Icons.person_pin_outlined);
  static const coverpic = MenuItem(text: 'Cover Image', icon: Icons.image);
  static const nametag = MenuItem(text: 'Nametag', icon: Icons.person_add);
  static const aboutme =
      MenuItem(text: 'About Me', icon: Icons.bookmark_added_rounded);

  static Widget buildItem(MenuItem item) {
    return Row(
      children: [
        Icon(item.icon, color: Colors.white, size: 20),
        const SizedBox(
          width: 10,
        ),
        Text(
          item.text,
          style: const TextStyle(
            fontSize: 14,
            color: Colors.white,
          ),
        ),
      ],
    );
  }

  static onChanged(BuildContext context, MenuItem item) {
    switch (item) {
      case MenuItems.profilepic:
        //Do something
        break;
      case MenuItems.nametag:
        //Do something
        break;
      case MenuItems.coverpic:
        //Do something
        break;
      case MenuItems.aboutme:
        //Do something
        break;
    }
  }
}

但是将此代码与我的明信片结合使用可以减少按钮的使用这是我的方法。

import 'package:dropdown_button2/dropdown_button2.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/svg.dart';

class ProfilePageCard extends StatefulWidget {
  const ProfilePageCard({Key? key}) : super(key: key);

  @override
  State<ProfilePageCard> createState() => _ProfilePageCardState();
}

class _ProfilePageCardState extends State<ProfilePageCard> {
  final double coverHeight = 232;
  final double profileHeight = 225;
  final double profileWidth = 169;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        clipBehavior: Clip.none,
        alignment: Alignment.centerLeft,
        children: [
          buildCoverImage(),
          const Positioned(
            top: 198,
            left: 350,
            child: Icon(
              Icons.perm_contact_cal,
              color: Colors.white,
            ),
          ),
          Positioned(
            top: 185,
            left: 6,
            child: buildProfileImage(),
          ),
          Positioned(
            top: 185 + 214,
            left: 148,
            child: DropdownButtonHideUnderline(
              child: DropdownButton2(
                customButton: SvgPicture.asset(
                  'assets/threedots.svg',
                  height: 30,
                  width: 30,
                ),
                customItemsIndexes: const [4],
                customItemsHeight: 8,
                items: [
                  ...MenuItems.firstItems.map(
                    (item) => DropdownMenuItem<MenuItem>(
                      value: item,
                      child: MenuItems.buildItem(item),
                    ),
                  ),
                ],
                onChanged: (value) {
                  MenuItems.onChanged(context, value as MenuItem);
                },
                itemHeight: 40,
                itemPadding: const EdgeInsets.only(left: 16, right: 16),
                dropdownWidth: 160,
                dropdownPadding: const EdgeInsets.symmetric(vertical: 6),
                dropdownDecoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(4),
                  color: Colors.black87,
                ),
                dropdownElevation: 8,
                offset: const Offset(0, 8),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget buildCoverImage() => Container(
        color: Colors.grey,
        child: Image.network(
          'https://images.unsplash.com/photo-1488646953014-85cb44e25828?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxleHBsb3JlLWZlZWR8MXx8fGVufDB8fHx8&auto=format&fit=crop&w=1000&q=60',
          width: double.infinity,
          height: coverHeight,
          fit: BoxFit.cover,
        ),
      );

  Widget buildProfileImage() => Container(
        decoration: BoxDecoration(
          border: Border.all(
            width: 6,
            color: Colors.white,
          ),
        ),
        child: Image.network(
          'https://images.unsplash.com/photo-1553860214-87b92d6c1e22?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxleHBsb3JlLWZlZWR8OXx8fGVufDB8fHx8&auto=format&fit=crop&w=1000&q=60',
          width: profileWidth,
          height: profileHeight,
          fit: BoxFit.cover,
        ),
      );

  Widget buildUsername() => SizedBox(
        width: 193,
        child: IntrinsicHeight(
          child: Row(
            mainAxisAlignment: MainAxisAlignment.start,
            children: const [
              Text(
                "XYZ Traveler",
                style: TextStyle(
                    color: Colors.black,
                    fontWeight: FontWeight.bold,
                    fontFamily: 'Inter'),
              ),
            ],
          ),
        ),
      );
}

class MenuItem {
  final String text;
  final IconData icon;

  const MenuItem({
    required this.text,
    required this.icon,
  });
}

class MenuItems {
  static const List<MenuItem> firstItems = [home, share, settings, logout];

  static const home =
      MenuItem(text: 'Profile Picture', icon: Icons.person_pin_outlined);
  static const share = MenuItem(text: 'Cover Image', icon: Icons.image);
  static const settings = MenuItem(text: 'Nametag', icon: Icons.person_add);
  static const logout = MenuItem(text: 'Log Out', icon: Icons.logout);

  static Widget buildItem(MenuItem item) {
    return Row(
      children: [
        Icon(item.icon, color: Colors.white, size: 20),
        const SizedBox(
          width: 10,
        ),
        Text(
          item.text,
          style: const TextStyle(
            fontSize: 14,
            color: Colors.white,
          ),
        ),
      ],
    );
  }

  static onChanged(BuildContext context, MenuItem item) {
    switch (item) {
      case MenuItems.home:
        //Do something
        break;
      case MenuItems.settings:
        //Do something
        break;
      case MenuItems.share:
        //Do something
        break;
      case MenuItems.logout:
        //Do something
        break;
    }
  }
}

谁能指出我做错了什么？

Answer 1

您应该将 Stack 包裹在 Container 中，然后设置容器尺寸，使按钮仍保持在边框内。

class _ProfilePageCardState extends State<ProfilePageCard> {
  final double coverHeight = 232;
  final double profileHeight = 225;
  final double profileWidth = 169;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        color: Colors.red,
        height: 450,
        child: Stack(
          clipBehavior: Clip.none,
          alignment: Alignment.centerLeft,
          children: [
            Align(
                alignment: Alignment.topCenter,
                child: buildCoverImage()),
            const Positioned(
              top: 198,
              left: 350,
              child: Icon(
                Icons.perm_contact_cal,
                color: Colors.white,
              ),
            ),
            Positioned(
              top: 185,
              left: 6,
              child: buildProfileImage(),
            ),
            Positioned(
              top: 185 + 190,
              left: 148,
              child: DropdownButtonHideUnderline(
                child: DropdownButton2(
                  customButton: const Icon(Icons.more_horiz_rounded, color: Colors.black, size: 60,),
                  customItemsIndexes: const [4],
                  customItemsHeight: 8,
                  items: [
                    ...MenuItems.firstItems.map(
                          (item) => DropdownMenuItem<MenuItem>(
                        value: item,
                        child: MenuItems.buildItem(item),
                      ),
                    ),
                  ],
                  onChanged: (value) {
                    MenuItems.onChanged(context, value as MenuItem);
                  },
                  itemHeight: 40,
                  itemPadding: const EdgeInsets.only(left: 16, right: 16),
                  dropdownWidth: 160,
                  dropdownPadding: const EdgeInsets.symmetric(vertical: 6),
                  dropdownDecoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(4),
                    color: Colors.black87,
                  ),
                  dropdownElevation: 8,
                  offset: const Offset(0, 8),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

使用 Dropdown_button2 包不适用于 Flutter 中的卡片视图

Using Dropdown_button2 package does not work for a card view in Flutter

flutter

flutter-layout

flutter-dependencies