Flutter智能滚动视图插件smart_scroll_view的使用

Flutter智能滚动视图插件smart_scroll_view的使用

在本教程中，我们将学习如何使用smart_scroll_view插件来创建一个智能滚动视图。smart_scroll_view插件提供了丰富的功能，例如刷新、头部视图等，使滚动视图更加智能和易于使用。

smart_scrollView

smart_scroll_view插件可以帮助开发者轻松地实现具有复杂功能的滚动视图。以下是一个简单的示例，展示了如何使用smart_scroll_view插件来创建一个带有刷新功能的滚动视图。

示例代码

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:smart_scroll_view/smart_scroll_view.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: SmartScrollViewExample(),
    );
  }
}

class SmartScrollViewExample extends StatefulWidget {
  const SmartScrollViewExample({super.key});

  @override
  State<SmartScrollViewExample> createState() => _SmartScrollViewExampleState();
}

class _SmartScrollViewExampleState extends State<SmartScrollViewExample> {
  var controller = EasyRefreshController();
  Color firstColor = const Color(0xFF1a1c19);
  Color secondaryColor = const Color(0xFF424940);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SmartScrollView(
        backgroundColor: firstColor,
        listPadding: const EdgeInsets.symmetric(horizontal: 5),
        refreshProperties: refreshProperties,
        headerProperties: headerProperties,
        secondHeaderProperties: secondHeaderProperties,
        itemHeight: 110,
        shadowProperties: null,
        scrollUpButtonProperties: ScrollUpButtonProperties(),
        onScrollIndexChange: (index) {
          if (kDebugMode) {
            print(index);
          }
        },
        builder: (context, index) => itemView(index),
        childCount: 30,
      ),
    );
  }

  Widget itemView(int index) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 5, top: 5, left: 5, right: 5),
      child: Container(
        height: 100,
        width: double.infinity,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(7),
          color: secondaryColor,
        ),
        alignment: Alignment.center,
        padding: const EdgeInsets.symmetric(horizontal: 15, vertical: 15),
        child: Row(children: [
          Container(
            height: 80,
            width: 80,
            color: firstColor,
          ),
          const SizedBox(
            width: 10,
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Padding(
                padding: const EdgeInsets.only(bottom: 10),
                child: Container(
                  height: 15,
                  width: 160,
                  color: firstColor,
                ),
              ),
              Padding(
                padding: const EdgeInsets.only(bottom: 5),
                child: Container(
                  height: 15,
                  width: 80,
                  color: firstColor,
                ),
              ),
              Container(
                height: 15,
                width: 80,
                color: firstColor,
              ),
            ],
          )
        ]),
      ),
    );
  }

  RefreshProperties get refreshProperties => RefreshProperties(
      controller: controller,
      header: const RefreshHeaderProperties(
        refreshView: CupertinoActivityIndicator(
          color: Colors.white,
        ),
        idleView: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.arrow_downward,
              color: Colors.white,
            ),
            Text(
              "下拉刷新！",
              style: TextStyle(
                  fontSize: 14,
                  color: Colors.white,
                  fontWeight: FontWeight.w400),
            )
          ],
        ),
        failedView: Text(
          "加载失败！点击重试！",
          style: TextStyle(
              fontSize: 14, color: Colors.white, fontWeight: FontWeight.w400),
        ),
        completedView: Text(
          "完成！",
          style: TextStyle(
              fontSize: 14, color: Colors.white, fontWeight: FontWeight.w400),
        ),
      ),
      onRefresh: () async {
        await Future.delayed(const Duration(seconds: 2));
        //controller.finishRefresh();
      });

  HeaderProperties get headerProperties => HeaderProperties(
        child: const Center(
          child: Text(
            "智能滚动视图",
            style: TextStyle(
                color: Colors.white, fontSize: 24, fontWeight: FontWeight.bold),
          ),
        ),
        height: 150,
        backgroundColor: Colors.black,
      );

  SecondHeaderProperties get secondHeaderProperties => SecondHeaderProperties(
      child: const Center(
        child: Text(
          "智能滚动视图",
          style: TextStyle(
              color: Colors.white, fontSize: 24, fontWeight: FontWeight.bold),
        ),
      ),
      height: 150,
      shadowColor: secondaryColor.withOpacity(0.4),
      backgroundColor: secondaryColor.withOpacity(0.95));
}

代码解析

  1. 导入必要的包

    import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:smart_scroll_view/smart_scroll_view.dart';

  2. 定义主应用入口

    void main() {
  runApp(const MyApp());
}

  3. 创建主应用类

    class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: SmartScrollViewExample(),
    );
  }
}

  4. 创建智能滚动视图示例类

    class SmartScrollViewExample extends StatefulWidget {
  const SmartScrollViewExample({super.key});

  @override
  State<SmartScrollViewExample> createState() => _SmartScrollViewExampleState();
}

  5. 定义智能滚动视图状态类

    class _SmartScrollViewExampleState extends State<SmartScrollViewExample> {
  var controller = EasyRefreshController();
  Color firstColor = const Color(0xFF1a1c19);
  Color secondaryColor = const Color(0xFF424940);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SmartScrollView(
        backgroundColor: firstColor,
        listPadding: const EdgeInsets.symmetric(horizontal: 5),
        refreshProperties: refreshProperties,
        headerProperties: headerProperties,
        secondHeaderProperties: secondHeaderProperties,
        itemHeight: 110,
        shadowProperties: null,
        scrollUpButtonProperties: ScrollUpButtonProperties(),
        onScrollIndexChange: (index) {
          if (kDebugMode) {
            print(index);
          }
        },
        builder: (context, index) => itemView(index),
        childCount: 30,
      ),
    );
  }

  6. 定义列表项视图

    Widget itemView(int index) {
  return Padding(
    padding: const EdgeInsets.only(bottom: 5, top: 5, left: 5, right: 5),
    child: Container(
      height: 100,
      width: double.infinity,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(7),
        color: secondaryColor,
      ),
      alignment: Alignment.center,
      padding: const EdgeInsets.symmetric(horizontal: 15, vertical: 15),
      child: Row(children: [
        Container(
          height: 80,
          width: 80,
          color: firstColor,
        ),
        const SizedBox(
          width: 10,
        ),
        Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Padding(
              padding: const EdgeInsets.only(bottom: 10),
              child: Container(
                height: 15,
                width: 160,
                color: firstColor,
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(bottom: 5),
              child: Container(
                height: 15,
                width: 80,
                color: firstColor,
              ),
            ),
            Container(
              height: 15,
              width: 80,
              color: firstColor,
            ),
          ],
        )
      ]),
    ),
  );
}

  7. 定义刷新属性

    RefreshProperties get refreshProperties => RefreshProperties(
      controller: controller,
      header: const RefreshHeaderProperties(
        refreshView: CupertinoActivityIndicator(
          color: Colors.white,
        ),
        idleView: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.arrow_downward,
              color: Colors.white,
            ),
            Text(
              "下拉刷新！",
              style: TextStyle(
                  fontSize: 14,
                  color: Colors.white,
                  fontWeight: FontWeight.w400),
            )
          ],
        ),
        failedView: Text(
          "加载失败！点击重试！",
          style: TextStyle(
              fontSize: 14, color: Colors.white, fontWeight: FontWeight.w400),
        ),
        completedView: Text(
          "完成！",
          style: TextStyle(
              fontSize: 14, color: Colors.white, fontWeight: FontWeight.w400),
        ),
      ),
      onRefresh: () async {
        await Future.delayed(const Duration(seconds: 2));
        //controller.finishRefresh();
      });

  8. 定义头部属性

    HeaderProperties get headerProperties => HeaderProperties(
      child: const Center(
        child: Text(
          "智能滚动视图",
          style: TextStyle(
              color: Colors.white, fontSize: 24, fontWeight: FontWeight.bold),
        ),
      ),
      height: 150,
      backgroundColor: Colors.black,
    );

  9. 定义第二个头部属性

    SecondHeaderProperties get secondHeaderProperties => SecondHeaderProperties(
      child: const Center(
        child: Text(
          "智能滚动视图",
          style: TextStyle(
              color: Colors.white, fontSize: 24, fontWeight: FontWeight.bold),
        ),
      ),
      height: 150,
      shadowColor: secondaryColor.withOpacity(0.4),
      backgroundColor: secondaryColor.withOpacity(0.95));

更多关于Flutter智能滚动视图插件smart_scroll_view的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter智能滚动视图插件smart_scroll_view的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


smart_scroll_view 是一个 Flutter 插件，旨在提供更智能的滚动视图体验。它可以帮助你在滚动视图时自动处理一些常见的需求，例如自动加载更多数据、自动隐藏/显示 AppBar 等。

安装插件

首先，你需要在 pubspec.yaml 文件中添加 smart_scroll_view 依赖：

dependencies:
  flutter:
    sdk: flutter
  smart_scroll_view: ^1.0.0 # 请检查最新版本

然后运行 flutter pub get 来安装依赖。

基本使用

SmartScrollView 是一个可滚动的视图，它可以根据滚动位置自动触发某些操作。以下是一个基本的使用示例：

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

class MyHomePage extends StatefulWidget {
  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<String> items = List.generate(20, (index) => "Item $index");
  bool isLoading = false;

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Smart Scroll View Example'),
      ),
      body: SmartScrollView(
        onBottomReached: _loadMoreItems,
        child: ListView.builder(
          itemCount: items.length,
          itemBuilder: (context, index) {
            return ListTile(
              title: Text(items[index]),
            );
          },
        ),
      ),
    );
  }

  void _loadMoreItems() async {
    if (isLoading) return;

    setState(() {
      isLoading = true;
    });

    // 模拟网络请求延迟
    await Future.delayed(Duration(seconds: 2));

    setState(() {
      items.addAll(List.generate(10, (index) => "New Item ${items.length + index}"));
      isLoading = false;
    });
  }
}

主要功能

  1. 自动加载更多数据:

    • onBottomReached: 当用户滚动到底部时，自动触发加载更多数据的回调。
    • onBottomReachedThreshold: 设置触发 onBottomReached 回调的阈值（默认是 0.8，表示在距离底部 80% 时触发）。

  2. 自动隐藏/显示 AppBar:

    • hideAppBarOnScroll: 设置为 true 时，滚动时会自动隐藏 AppBar。
    • showAppBarOnScrollUp: 设置为 true 时，向上滚动时会自动显示 AppBar。

  3. 其他功能:

    • scrollController: 允许你自定义 ScrollController。
    • physics: 允许你自定义滚动物理效果。

示例代码

以下是一个结合了自动加载更多数据和自动隐藏 AppBar 的完整示例：

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

class MyHomePage extends StatefulWidget {
  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  List<String> items = List.generate(20, (index) => "Item $index");
  bool isLoading = false;

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Smart Scroll View Example'),
      ),
      body: SmartScrollView(
        onBottomReached: _loadMoreItems,
        hideAppBarOnScroll: true,
        showAppBarOnScrollUp: true,
        child: ListView.builder(
          itemCount: items.length,
          itemBuilder: (context, index) {
            return ListTile(
              title: Text(items[index]),
            );
          },
        ),
      ),
    );
  }

  void _loadMoreItems() async {
    if (isLoading) return;

    setState(() {
      isLoading = true;
    });

    // 模拟网络请求延迟
    await Future.delayed(Duration(seconds: 2));

    setState(() {
      items.addAll(List.generate(10, (index) => "New Item ${items.length + index}"));
      isLoading = false;
    });
  }
}
回到顶部