Flutter GTK弹出菜单插件popover_gtk的使用

Popover for Flutter

内容

• 功能
• 需求
• 安装
• 示例
• 支持
• 许可证

功能

弹出菜单是一种在用户点击控件或区域时出现在屏幕其他内容上方的临时视图。通常，弹出菜单包含一个指向其出现位置的箭头。弹出菜单可以是非模态的也可以是模态的。非模态弹出菜单可以通过点击屏幕的其他部分或弹出菜单上的按钮来关闭。模态弹出菜单可以通过点击取消或其他按钮来关闭。

来源：Human Interface Guidelines

需求

• Dart: 2.12.0+
• Flutter : 2.0.0+

安装

dependencies:
  popover: ^0.2.6+3

示例

查看 example/lib/main.dart。

import 'package:flutter/material.dart';
import 'package:popover_gtk/popover_gtk.dart';

void main() => runApp(PopoverExample());

class PopoverExample extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Popover Example')),
        body: SafeArea(
          child: Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              mainAxisSize: MainAxisSize.max,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: [
                    const Button(),
                    const Button(),
                    const Button(),
                  ],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: [
                    const Button(),
                    const Button(),
                    const Button(),
                  ],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  mainAxisSize: MainAxisSize.max,
                  children: [
                    const Button(),
                    const Button(),
                    const Button(),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class Button extends StatelessWidget {
  const Button({Key? key}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Container(
      width: 80,
      height: 40,
      decoration: const BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.all(Radius.circular(5)),
        boxShadow: [BoxShadow(color: Colors.black26, blurRadius: 5)],
      ),
      child: GestureDetector(
        child: const Center(child: Text('Click Me')),
        onTap: () {
          showPopover(
            context: context,
            transitionDuration: const Duration(milliseconds: 250),
            bodyBuilder: (context) => const ListItems(),
            onPop: () => print('Popover was popped!'),
            direction: PopoverDirection.bottom,
            width: 200,
            height: 400,
            arrowHeight: 15,
            arrowWidth: 30,
          );
        },
      ),
    );
  }
}

class ListItems extends StatelessWidget {
  const ListItems({Key? key}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scrollbar(
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 8),
        child: ListView(
          padding: const EdgeInsets.all(8),
          children: [
            InkWell(
              onTap: () {
                Navigator.of(context)
                  ..pop()
                  ..push(
                    MaterialPageRoute<SecondRoute>(
                      builder: (context) => SecondRoute(),
                    ),
                  );
              },
              child: Container(
                height: 50,
                color: Colors.amber[100],
                child: const Center(child: Text('Entry A')),
              ),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[200],
              child: const Center(child: Text('Entry B')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[300],
              child: const Center(child: Text('Entry C')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[400],
              child: const Center(child: Text('Entry D')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[500],
              child: const Center(child: Text('Entry E')),
            ),
            const Divider(),
            Container(
              height: 50,
              color: Colors.amber[600],
              child: const Center(child: Text('Entry F')),
            ),
          ],
        ),
      ),
    );
  }
}

class SecondRoute extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Second Route'),
        automaticallyImplyLeading: false,
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () => Navigator.pop(context),
          child: const Text('Go back!'),
        ),
      ),
    );
  }
}