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Added a function that can provide a decision between a snap or not #42

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Added a function that can provide a decision between a snap or not #42

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8 changes: 7 additions & 1 deletion lib/scroll_snap_list.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,8 @@ class ScrollSnapList extends StatefulWidget {

final EdgeInsetsGeometry? listViewPadding;

final bool Function()? canIScroll;

ScrollSnapList(
{this.background,
required this.itemBuilder,
Expand Down Expand Up @@ -154,7 +156,8 @@ class ScrollSnapList extends StatefulWidget {
this.clipBehavior = Clip.hardEdge,
this.keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual,
this.dispatchScrollNotifications = false,
this.listViewPadding})
this.listViewPadding,
this.canIScroll})
: listController = listController ?? ScrollController(),
super(key: key);

Expand Down Expand Up @@ -383,6 +386,9 @@ class ScrollSnapListState extends State<ScrollSnapList> {

//only animate if not yet snapped (tolerance 0.01 pixel)
if ((scrollInfo.metrics.pixels - offset).abs() > 0.01) {
if (widget.canIScroll != null && !widget.canIScroll!()) {
return false;
}
_animateScroll(offset);
}
} else if (scrollInfo is ScrollUpdateNotification) {
Expand Down