talksik/stream-chat-flutter
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Signed-off-by: Sahil Kumar <[email protected]>
This commit is contained in:
Sahil Kumar
2020-12-16 16:56:09 +05:30
parent adefbc1e2d
commit 7495acee3e
11 changed files with 504 additions and 323 deletions
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lib/src/lazy_load_scroll_view.dart
+23 -14
View File
@@ -1,3 +1,4 @@
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
enum _LoadingStatus { LOADING, STABLE }
@@ -9,10 +10,10 @@ class LazyLoadScrollView extends StatefulWidget {
final Widget child;
/// Called when the [child] reaches the start of the list
final VoidCallback onStartOfPage;
final AsyncCallback onStartOfPage;
/// Called when the [child] reaches the end of the list
final VoidCallback onEndOfPage;
final AsyncCallback onEndOfPage;
/// The offset to take into account when triggering [onEndOfPage] in pixels
final double scrollOffset;
@@ -38,14 +39,6 @@ class LazyLoadScrollView extends StatefulWidget {
class _LazyLoadScrollViewState extends State<LazyLoadScrollView> {
_LoadingStatus _loadMoreStatus = _LoadingStatus.STABLE;
@override
void didUpdateWidget(LazyLoadScrollView oldWidget) {
super.didUpdateWidget(oldWidget);
if (!widget.isLoading) {
_loadMoreStatus = _LoadingStatus.STABLE;
}
}
@override
Widget build(BuildContext context) {
return NotificationListener(
@@ -62,7 +55,11 @@ class _LazyLoadScrollViewState extends State<LazyLoadScrollView> {
if (_loadMoreStatus != null &&
_loadMoreStatus == _LoadingStatus.STABLE) {
_loadMoreStatus = _LoadingStatus.LOADING;
widget.onEndOfPage();
if (widget.onEndOfPage != null) {
widget.onEndOfPage().whenComplete(() {
_loadMoreStatus = _LoadingStatus.STABLE;
});
}
}
}
if (notification.metrics.minScrollExtent < notification.metrics.pixels &&
@@ -71,7 +68,11 @@ class _LazyLoadScrollViewState extends State<LazyLoadScrollView> {
if (_loadMoreStatus != null &&
_loadMoreStatus == _LoadingStatus.STABLE) {
_loadMoreStatus = _LoadingStatus.LOADING;
widget.onStartOfPage();
if (widget.onStartOfPage != null) {
widget.onStartOfPage().whenComplete(() {
_loadMoreStatus = _LoadingStatus.STABLE;
});
}
}
}
return true;
@@ -81,14 +82,22 @@ class _LazyLoadScrollViewState extends State<LazyLoadScrollView> {
if (_loadMoreStatus != null &&
_loadMoreStatus == _LoadingStatus.STABLE) {
_loadMoreStatus = _LoadingStatus.LOADING;
widget.onEndOfPage();
if (widget.onEndOfPage != null) {
widget.onEndOfPage().whenComplete(() {
_loadMoreStatus = _LoadingStatus.STABLE;
});
}
}
}
if (notification.overscroll < 0) {
if (_loadMoreStatus != null &&
_loadMoreStatus == _LoadingStatus.STABLE) {
_loadMoreStatus = _LoadingStatus.LOADING;
widget.onStartOfPage();
if (widget.onStartOfPage != null) {
widget.onStartOfPage().whenComplete(() {
_loadMoreStatus = _LoadingStatus.STABLE;
});
}
}
}
return true;