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Adds the possibility to nest multiple sticky headers #69

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Adds the possibility to nest multiple sticky headers #69

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13 changes: 12 additions & 1 deletion lib/sticky_headers/render.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -27,15 +27,18 @@ class RenderStickyHeader extends RenderBox
RenderStickyHeaderCallback? _callback;
ScrollPosition _scrollPosition;
bool _overlapHeaders;
double _offset;

RenderStickyHeader({
required ScrollPosition scrollPosition,
RenderStickyHeaderCallback? callback,
bool overlapHeaders = false,
RenderBox? header,
RenderBox? content,
double? offset,
}) : _scrollPosition = scrollPosition,
_callback = callback,
_offset = offset ?? 0,
_overlapHeaders = overlapHeaders {
if (content != null) add(content);
if (header != null) add(header);
Expand All @@ -62,6 +65,14 @@ class RenderStickyHeader extends RenderBox
markNeedsLayout();
}

set offset(double newValue) {
if (_offset == newValue) {
return;
}
_offset = newValue;
markNeedsLayout();
}

set overlapHeaders(bool newValue) {
if (_overlapHeaders == newValue) {
return;
Expand Down Expand Up @@ -135,7 +146,7 @@ class RenderStickyHeader extends RenderBox
final scrollBox = _scrollPosition.context.notificationContext!.findRenderObject();
if (scrollBox?.attached ?? false) {
try {
return localToGlobal(Offset.zero, ancestor: scrollBox).dy;
return localToGlobal(Offset.zero, ancestor: scrollBox).dy - _offset;
} catch (e) {
// ignore and fall-through and return 0.0
}
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4 changes: 4 additions & 0 deletions lib/sticky_headers/widget.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -70,10 +70,14 @@ class StickyHeader extends MultiChildRenderObjectWidget {

@override
void updateRenderObject(BuildContext context, RenderStickyHeader renderObject) {
// If we find a parent StickyHeader we look for its size to provide an offset
// to current StickyHeader
final parent = context.findAncestorRenderObjectOfType<RenderStickyHeader>();
final scrollPosition = controller?.position ?? Scrollable.of(context)!.position;
renderObject
..scrollPosition = scrollPosition
..callback = callback
..offset = parent?.lastChild?.size.height ?? 0
..overlapHeaders = overlapHeaders;
}
}
Expand Down