Flutter implementation of sticky headers and expandable list.Support use it in a CustomScrollView.
README i18n:中文说明
In the pubspec.yaml
of your flutter project, add the following dependency:
dependencies:
sticky_and_expandable_list: ^1.1.3
sectionList
is a custom data source for ExpandableListView
.
We should create a model list to store the information of each section, the model must implement ExpandableListSection
.
//In this example, we create a custom model class(ExampleSection).
//class ExampleSection implements ExpandableListSection<String> {}
//so: SliverExpandableChildDelegate<String, ExampleSection>()
List<ExampleSection> sectionList = List<ExampleSection>();
return ExpandableListView(
builder: SliverExpandableChildDelegate<String, ExampleSection>(
sectionList: sectionList,
headerBuilder: (context, sectionIndex, index) =>
Text("Header #$sectionIndex"),
itemBuilder: (context, sectionIndex, itemIndex, index) {
String item = sectionList[sectionIndex].items[itemIndex];
return ListTile(
leading: CircleAvatar(
child: Text("$index"),
),
title: Text(item),
);
}),
);
If you want to use it with sliver widget, use SliverExpandableList instead of ExpandableListView.
setState(() {
sectionList[i].setSectionExpanded(true);
});
@override
Widget build(BuildContext context) {
ExpandableListView(
builder: SliverExpandableChildDelegate<String, ExampleSection>(
headerController: _getHeaderController(),
),
)
}
_getHeaderController() {
var controller = ExpandableListController();
controller.addListener(() {
print("switchingSectionIndex:${controller.switchingSectionIndex}, stickySectionIndex:" +
"${controller.stickySectionIndex},scrollPercent:${controller.percent}");
});
return controller;
}
Use sectionBuilder
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