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Added optional before and after slivers to sandwich the list. #40

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Added optional before and after slivers to sandwich the list. #40

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10ef831
Added optional before and after slivers to sandwich the list.
thomas-at-briix Aug 5, 2020
7d37eaa
Divider. Doesn't work with "reverse" list, only for vertical list.
thomas-at-briix Aug 6, 2020
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36 changes: 27 additions & 9 deletions lib/widget.dart
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Original file line number Diff line number Diff line change
@@ -1,12 +1,13 @@
import 'dart:async';

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

import './render.dart';
import 'models/alignments.dart';
import 'models/sticky_state.dart';
import 'models/types.dart';
import 'models/alignments.dart';

typedef InfiniteListItem<I> ItemBuilder<I>(BuildContext context, I index);

Expand Down Expand Up @@ -228,6 +229,15 @@ class InfiniteList extends StatefulWidget {
/// Proxy property for [ScrollView.physics]
final ScrollPhysics physics;

/// Additional slivers to be placed before the list.
final List<Widget> sliversBefore;

/// Additional slivers to be placed after the list.
final List<Widget> sliversAfter;

/// Divider.
final Widget divider;

final Key _centerKey;

InfiniteList({
Expand All @@ -242,6 +252,9 @@ class InfiniteList extends StatefulWidget {
this.cacheExtent,
this.scrollDirection = Axis.vertical,
this.physics,
this.sliversBefore = const [],
this.sliversAfter = const [],
this.divider,
}) : _centerKey =
(direction == InfiniteListDirection.multi) ? UniqueKey() : null,
super(key: key);
Expand All @@ -265,30 +278,35 @@ class _InfiniteListState extends State<InfiniteList> {
SliverList get _forwardList => SliverList(
delegate: SliverChildBuilderDelegate(
_buildListItem,
childCount: widget.posChildCount,
childCount: widget.posChildCount * 2 - 1,
),
key: widget._centerKey,
);

Widget _buildListItem(BuildContext context, int index) =>
_StickySliverListItem<int>(
streamController: _streamController,
index: index,
listItem: widget.builder(context, index),
);
Widget _buildListItem(BuildContext context, int index) => index.isEven
? _StickySliverListItem<int>(
streamController: _streamController,
index: index,
listItem: widget.builder(context, index ~/ 2),
)
: widget.divider;

List<SliverList> get _slivers {
List<Widget> get _slivers {
switch (widget.direction) {
case InfiniteListDirection.multi:
return [
...widget.sliversBefore,
_reverseList,
_forwardList,
...widget.sliversAfter,
];

case InfiniteListDirection.single:
default:
return [
...widget.sliversBefore,
_forwardList,
...widget.sliversAfter,
];
}
}
Expand Down
2 changes: 1 addition & 1 deletion pubspec.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ repository: https://github.com/TatsuUkraine/flutter_sticky_infinite_list
issue_tracker: https://github.com/TatsuUkraine/flutter_sticky_infinite_list/issues

environment:
sdk: ">=2.1.0 <3.0.0"
sdk: ">=2.2.2 <3.0.0"
flutter: ">=1.20.0-2.0.pre"

dependencies:
Expand Down