[scrollable_positioned_list] Add thumbVisibility parameter #557
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Add an optional `thumbVisibility` parameter to `ScrollablePositionedList` to allow persistent display of the scrollbar thumb. This forwards the `thumbVisibility` value to the internal `Scrollbar` widget, aligning with the core Flutter API. The parameter defaults to `false`, preserving the current behavior of showing the thumb only while scrolling.
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Add an optional
thumbVisibilityparameter toScrollablePositionedListto allow persistent display of the scrollbar thumb.This forwards the
thumbVisibilityvalue to the internalScrollbarwidget, aligning with the core Flutter API.The parameter defaults to
false, preserving the current behavior of showing the thumb only while scrolling.Description
This PR adds support for an optional
thumbVisibilityparameter inScrollablePositionedListandScrollablePositionedList.separated.It forwards the value to the internal
Scrollbarwidget, allowing developers to always show the scrollbar thumb if desired.Existing behavior is preserved by default (
thumbVisibility: false), so this change is fully backward-compatible.Related Issues
N/A – this is a new feature request, not tied to a specific issue.
Checklist
Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes (
[x]). This will ensure a smooth and quick review process.flutter testpass.flutter analyzedoes not report any problems on my PR.Checklist
flutter testpass.flutter analyzedoes not report any problems on my PR.