DEV/flutter_flutter
1
0
Fork 0
mirror of https://github.com/flutter/flutter.git synced 2026-02-20 02:29:02 +08:00
Code Issues Packages Projects Releases Wiki Activity

Port complex_layout to Sliver-based scrolling (#8114)

Browse Source
This commit is contained in:
Adam Barth 2017-02-13 16:30:19 -08:00 committed by GitHub
parent f36566fa6f
commit 88a01ac40c
1 changed files with 7 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
dev/benchmarks/complex_layout/lib/main.dart
View File

@ -52,28 +52,9 @@ class ComplexLayout extends StatefulWidget {
static ComplexLayoutState of(BuildContext context) => context.ancestorStateOfType(const TypeMatcher<ComplexLayoutState>());
}
class FancyItemDelegate extends LazyBlockDelegate {
@override
Widget buildItem(BuildContext context, int index) {
if (index % 2 == 0)
return new FancyImageItem(index, key: new ValueKey<int>(index));
else
return new FancyGalleryItem(index, key: new ValueKey<int>(index));
}
@override
bool shouldRebuild(FancyItemDelegate oldDelegate) => false;
@override
double estimateTotalExtent(int firstIndex, int lastIndex, double minOffset, double firstStartOffset, double lastEndOffset) {
return double.INFINITY;
}
}
class ComplexLayoutState extends State<ComplexLayout> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Advanced Layout'),
@ -91,9 +72,14 @@ class ComplexLayoutState extends State<ComplexLayout> {
body: new Column(
children: <Widget>[
new Expanded(
child: new LazyBlock(
child: new ListView.builder(
key: new Key('main-scroll'), // this key is used by the driver test
delegate: new FancyItemDelegate(),
itemBuilder: (BuildContext context, int index) {
if (index % 2 == 0)
return new FancyImageItem(index, key: new ValueKey<int>(index));
else
return new FancyGalleryItem(index, key: new ValueKey<int>(index));
},
)
),
new BottomBar(),