zoom_view

Description:

zoom view

Widget that allows both zooming and scrolling a ListView or other Scrollables

Features #
Scroll a ListView while it is zoomed in with fling velocity
Usage #
Using ListView #
import 'package:flutter/material.dart';
import 'package:zoom_view/zoom_view.dart';

void main() {
runApp(const MaterialApp(home: MyApp()));
}

class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
ScrollController controller = ScrollController();
@override
Widget build(BuildContext context) {
return Scaffold(
body: ZoomListView(
child: ListView.builder(
controller: controller,
itemCount: 10000,
itemBuilder: (context, index) {
return Center(
child: Text("text $index")
);
}
),
),
);
}
}

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Note that the controller argument most be set for your ListView.
Using some other scrolling list #

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

@override
State<ZoomViewExample> createState() => _ZoomViewExampleState();
}

class _ZoomViewExampleState extends State<ZoomViewExample> {
ScrollController controller = ScrollController();
@override
Widget build(BuildContext context) {
return Scaffold(
body: ZoomView(
controller: controller,
child: ListView.builder(
controller: controller,
itemCount: 10000,
itemBuilder: (context, index) {
return Center(
child: Text("text $index")
);
}
),
),
);
}
}

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Note that here the controller is given both to the ZoomView and the List.
Using ScrollablePositionedList #
add this class:

class ScrollOffsetToScrollController extends ScrollController{
ScrollOffsetToScrollController({required this.scrollOffsetController});
final ScrollOffsetController scrollOffsetController;

@override
ScrollPosition get position => scrollOffsetController.position;

@override
double get offset => 0.0;

@override
void jumpTo(double value){
scrollOffsetController.jumpTo(value);
}
}

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Usage:

final ScrollOffsetController scrollOffsetController = ScrollOffsetController();

ZoomView(
controller: ScrollOffsetToScrollController(
scrollOffsetController: scrollOffsetController,
),
child: ScrollablePositionedList.builder(
scrollOffsetController : scrollOffsetController,
itemBuilder: (context, index) => Text('Item $index'),
),
),

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