draggable_scrollbar_sliver 0.0.1

Flutter Community: draggable_scrollbar

Draggable Scrollbar #

Pub

A scrollbar that can be dragged for quickly navigation through a vertical list. Additionaly it can show label next to scrollthumb with information about current item, for example date of picture created

Usage #

You can use one of the three built-in scroll thumbs, or you can create a custom thumb for your own app!

You can play with all of these examples by running the app found in the example folder.

Example #

Semicircle Thumb #

DraggableScrollbar.semicircle(
  controller: myScrollController,
  child: GridView.builder(
    gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
      crossAxisCount: 5,
    ),
    controller: myScrollController,
    padding: EdgeInsets.zero,
    itemCount: 1000,
    itemBuilder: (context, index) {
      return Container(
        alignment: Alignment.center,
        margin: EdgeInsets.all(2.0),
        color: Colors.grey[300],
      );
    },
  ),
);

Arrows thumb + label #

DraggableScrollbar.arrows(
  labelTextBuilder: (double offset) => Text("${offset ~/ 100}"),
  controller: myScrollController,
  child: ListView.builder(
    controller: myScrollController,
    itemCount: 1000,
    itemExtent: 100.0,
    itemBuilder: (context, index) {
      return Container(
        padding: EdgeInsets.all(8.0),
        child: Material(
          elevation: 4.0,
          borderRadius: BorderRadius.circular(4.0),
          color: Colors.purple[index % 9 * 100],
          child: Center(
            child: Text(index.toString()),
          ),
        ),
      );
    },
  ),
);

Rounded Rectangle Thumb #

DraggableScrollbar.rrect(
  controller: myScrollController,
  child: ListView.builder(
    controller: myScrollController,
    itemCount: 1000,
    itemExtent: 100.0,
    itemBuilder: (context, index) {
      return Container(
        padding: EdgeInsets.all(8.0),
        child: Material(
          elevation: 4.0,
          borderRadius: BorderRadius.circular(4.0),
          color: Colors.green[index % 9 * 100],
          child: Center(
            child: Text(index.toString()),
          ),
        ),
      );
    },
  ),
);

Custom #

DraggableScrollbar(
  controller: myScrollController,
  child: ListView.builder(
    controller: myScrollController,
    itemCount: 1000,
    itemExtent: 100.0,
    itemBuilder: (context, index) {
      return Container(
        padding: EdgeInsets.all(8.0),
        child: Material(
          elevation: 4.0,
          borderRadius: BorderRadius.circular(4.0),
          color: Colors.cyan[index % 9 * 100],
          child: Center(
            child: Text(index.toString()),
          ),
        ),
      );
    },
  ),
  heightScrollThumb: 48.0,
  backgroundColor: Colors.blue,
  scrollThumbBuilder: (
    Color backgroundColor,
    Animation<double> thumbAnimation,
    Animation<double> labelAnimation,
    double height, {
    Text labelText,
  }) {
    return FadeTransition(
      opacity: thumbAnimation,
      child: Container(
        height: height,
        width: 20.0,
        color: backgroundColor,
      ),
    );
  },
);

0.0.4 #

  • support Dart 2.0
  • add LayoutBuilder and RepaintBoundary

0.0.3 #

  • add demo to README

0.0.2 #

0.0.1 #

  • A Widget that helps users to scroll quickly through a list
  • Can optionally display a label as the user scrolls
  • 3 styles available:
    • Semicircle style
    • Arrow Style
    • Rounded Rectangle Style

example/README.md

example #

An example application that demonstrates how to use a the draggable_scrollbar package

Getting Started #

For help getting started with Flutter, view our online documentation.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  draggable_scrollbar_sliver: ^0.0.1

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:draggable_scrollbar_sliver/draggable_scrollbar_sliver.dart';
  
Popularity:
Describes how popular the package is relative to other packages. [more]
37
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
80
Overall:
Weighted score of the above. [more]
65
Learn more about scoring.

We analyzed this package on Jul 17, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.4.0
  • pana: 0.12.19
  • Flutter: 1.7.8+hotfix.3

Platforms

Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Health suggestions

Fix lib/draggable_scrollbar_sliver.dart. (-0.50 points)

Analysis of lib/draggable_scrollbar_sliver.dart reported 1 hint:

line 377 col 25: This function has a return type of 'bool', but doesn't end with a return statement.

Maintenance suggestions

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.

The description is too long. (-10 points)

Search engines display only the first part of the description. Try to keep the value of the description field in your package's pubspec.yaml file between 60 and 180 characters.

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.19.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
flutter_test

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