Flutter 如何更改鼠标滚轮上 ListView 的滚动速度？

Question

我是初学者。我正在 Windows 下写一个关于 Flutter 的应用程序。问题是 ListView 中的文本因鼠标剪辑而滚动得太慢。我试图覆盖 ScrollPhysics，但它没有用。请给出一个改变滚动速度的有效方法。

Answer 1

   class ScrollViewTest extends StatelessWidget{
    
    static const _extraScrollSpeed = 80; // your "extra" scroll speed
    final ScrollController _scrollController = ScrollController();

  // Constructor
   
    ScrollViewTest({Key? key}) : super(key: key)
    {
        _scrollController.addListener(() {
        ScrollDirection scrollDirection = _scrollController.position.userScrollDirection;
      if (scrollDirection != ScrollDirection.idle)
      {
        double scrollEnd = _scrollController.offset + (scrollDirection == ScrollDirection.reverse
                       ? _extraScrollSpeed
                       : -_extraScrollSpeed);
        scrollEnd = min(
                 _scrollController.position.maxScrollExtent,
                 max(_scrollController.position.minScrollExtent, scrollEnd));
        _scrollController.jumpTo(scrollEnd);
      }
    });
  }

  @override
  
    Widget build(BuildContext context)
    {
    
    return SingleChildScrollView(
      controller: _scrollController,
      child: Container(...),
    );
  }
}

Answer 2

对于发现这个 post 的人：根据上面接受的答案，这个自定义 class 可以放入并在整个应用程序中使用。

自定义 AdjustableScrollController

// scrollcontroller.dart

import 'dart:math';
import 'package:flutter/rendering.dart';
import 'package:flutter/material.dart';

class AdjustableScrollController extends ScrollController {
  AdjustableScrollController([int extraScrollSpeed = 40]) {
    super.addListener(() {
      ScrollDirection scrollDirection = super.position.userScrollDirection;
      if (scrollDirection != ScrollDirection.idle) {
        double scrollEnd = super.offset +
            (scrollDirection == ScrollDirection.reverse
                ? extraScrollSpeed
                : -extraScrollSpeed);
        scrollEnd = min(super.position.maxScrollExtent,
            max(super.position.minScrollExtent, scrollEnd));
        jumpTo(scrollEnd);
      }
    });
  }
}

用法

// your_file.dart

ListView(
  controller: AdjustableScrollController() // default is 40

或

// your_file.dart

ListView(
  controller: AdjustableScrollController(80)  // scroll even faster

Flutter 如何更改鼠标滚轮上 ListView 的滚动速度？

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