extended_sliver
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Description
A powerful extension library of Sliver, which include SliverToNestedScrollBoxAdapter, SliverPinnedPersistentHeader, SliverPinnedToBoxAdapter and ExtendedSliverAppbar.
Usage
Add packages to dependencies
Add the package to pubspec.yaml under dependencies.
dependencies:
extended_sliver: latest-versionDownload with flutter packages get
SliverPinnedPersistentHeader
It's the same as SliverPersistentHeader(pinned: true), but you don't have to force values of minExtent and maxExtent.
It provides minExtentProtoType and maxExtentProtoType to calculate minExtent and maxExtent automatically.
It's useful that you don't know the final extent before the widgets are laid out.
SliverPinnedPersistentHeader(
delegate: MySliverPinnedPersistentHeaderDelegate(
minExtentProtoType: Container(
height: 120.0,
color: Colors.red.withOpacity(0.5),
child: FlatButton(
child: const Text('minProtoType'),
onPressed: () {
print('minProtoType');
},
),
alignment: Alignment.topCenter,
),
maxExtentProtoType: Container(
height: 200.0,
color: Colors.blue,
child: FlatButton(
child: const Text('maxProtoType'),
onPressed: () {
print('maxProtoType');
},
),
alignment: Alignment.bottomCenter,
),
),
)SliverPinnedToBoxAdapter
You can create a pinned Sliver easily with it.
It's useful that you don't know the final extent before the child are laid out.
SliverPinnedToBoxAdapter(
child: Container(
padding: const EdgeInsets.all(20),
color: Colors.blue.withOpacity(0.5),
child: Column(
children: <Widget>[
const Text(
'[love]Extended text help you to build rich text quickly. any special text you will have with extended text. '
'\n\nIt\'s my pleasure to invite you to join \$FlutterCandies\$ if you want to improve flutter .[love]'
'\n\nif you meet any problem, please let me konw @zmtzawqlp .[sun_glasses]'),
FlatButton(
child: const Text('I\'m button. click me!'),
onPressed: () {
debugPrint('click');
},
),
],
),
),
)ExtendedSliverAppbar
You can create SliverAppbar with out force the expandedHeight.
return CustomScrollView(
slivers: <Widget>[
ExtendedSliverAppbar(
title: const Text(
'ExtendedSliverAppbar',
style: TextStyle(color: Colors.white),
),
leading: const BackButton(
onPressed: null,
color: Colors.white,
),
background: Image.asset(
'assets/cypridina.jpeg',
fit: BoxFit.cover,
),
actions: Padding(
padding: const EdgeInsets.all(10.0),
child: Icon(
Icons.more_horiz,
color: Colors.white,
),
),
),
],
);SliverToNestedScrollBoxAdapter
You can create nested scrollable widget(like Webview) in CustomScrollView/NestedScrollView.
return CustomScrollView(
slivers: <Widget>[
SliverToBoxAdapter(
child: Container(
height: 100,
color: Colors.red,
child: const Center(
child: Text(
'Header',
style: TextStyle(color: Colors.white),
),
),
),
),
ValueListenableBuilder<double>(
valueListenable: nestedWebviewController.scrollHeightNotifier,
builder: (
BuildContext context,
double scrollHeight,
Widget? child,
) {
return SliverToNestedScrollBoxAdapter(
childExtent: scrollHeight,
onScrollOffsetChanged: (double scrollOffset) {
double y = scrollOffset;
if (Platform.isAndroid) {
// https://github.com/flutter/flutter/issues/75841
y *= window.devicePixelRatio;
nestedWebviewController.webviewController
?.scrollTo(0, y.ceil());
},
child: child,
);
},
child: WebView(
initialUrl: nestedWebviewController.initialUrl,
onPageStarted: nestedWebviewController.onPageStarted,
onPageFinished: nestedWebviewController.onPageFinished,
onWebResourceError:
nestedWebviewController.onWebResourceError,
onWebViewCreated: nestedWebviewController.onWebViewCreated,
onProgress: nestedWebviewController.onProgress,
javascriptChannels: <JavascriptChannel>{
nestedWebviewController
.scrollHeightNotifierJavascriptChannel
},
javascriptMode: JavascriptMode.unrestricted,
),
),
SliverToBoxAdapter(
child: Container(
height: 300,
color: Colors.green,
child: const Center(
child: Text(
'Footer',
style: TextStyle(color: Colors.white),
),
),
),
),
],
);Complex Demo
