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SliverWithPinnedFooter #59
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,103 @@ | ||
import 'dart:math'; | ||
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import 'package:flutter/rendering.dart'; | ||
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class RenderSliverWithPinnedFooterParentData extends ParentData | ||
with ContainerParentDataMixin<RenderObject> {} | ||
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class RenderSliverWithPinnedFooter extends RenderSliver | ||
with | ||
ContainerRenderObjectMixin<RenderObject, | ||
RenderSliverWithPinnedFooterParentData> { | ||
@override | ||
void setupParentData(covariant RenderObject child) { | ||
if (child.parentData is! RenderSliverWithPinnedFooterParentData) { | ||
child.parentData = RenderSliverWithPinnedFooterParentData(); | ||
} | ||
} | ||
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@override | ||
void applyPaintTransform(covariant RenderObject child, Matrix4 transform) { | ||
if (child == lastChild) { | ||
final geometry = this.geometry!; | ||
final footer = child as RenderBox; | ||
final footerTop = | ||
geometry.paintOrigin + geometry.paintExtent - footer.size.height; | ||
transform.translate(0.0, footerTop); | ||
} | ||
} | ||
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@override | ||
void performLayout() { | ||
final sliver = firstChild as RenderSliver; | ||
final footer = lastChild as RenderBox; | ||
sliver.layout(constraints, parentUsesSize: true); | ||
footer.layout(constraints.asBoxConstraints(), parentUsesSize: true); | ||
final paintExtent = min(constraints.remainingPaintExtent, | ||
sliver.geometry!.paintExtent + footer.size.height); | ||
final layoutExtent = min(constraints.remainingPaintExtent, | ||
sliver.geometry!.layoutExtent + footer.size.height); | ||
final cacheExtent = min(constraints.remainingPaintExtent, | ||
sliver.geometry!.cacheExtent + footer.size.height); | ||
geometry = SliverGeometry( | ||
scrollExtent: sliver.geometry!.scrollExtent + footer.size.height, | ||
paintExtent: paintExtent, | ||
paintOrigin: sliver.geometry!.paintOrigin, | ||
layoutExtent: layoutExtent, | ||
maxPaintExtent: sliver.geometry!.maxPaintExtent + footer.size.height, | ||
maxScrollObstructionExtent: sliver.geometry!.maxScrollObstructionExtent, | ||
hitTestExtent: paintExtent, | ||
visible: sliver.geometry!.visible, | ||
hasVisualOverflow: sliver.geometry!.hasVisualOverflow, | ||
scrollOffsetCorrection: sliver.geometry!.scrollOffsetCorrection, | ||
cacheExtent: cacheExtent, | ||
); | ||
} | ||
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@override | ||
bool hitTestChildren( | ||
SliverHitTestResult result, { | ||
double? mainAxisPosition, | ||
double? crossAxisPosition, | ||
}) { | ||
if (mainAxisPosition == null || crossAxisPosition == null) return false; | ||
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final geometry = this.geometry!; | ||
final sliver = firstChild as RenderSliver; | ||
final footer = lastChild as RenderBox; | ||
final footerTop = | ||
geometry.paintOrigin + geometry.paintExtent - footer.size.height; | ||
if (mainAxisPosition >= footerTop) { | ||
final hit = footer.hitTest( | ||
BoxHitTestResult.wrap(result), | ||
position: Offset(crossAxisPosition, mainAxisPosition - footerTop), | ||
); | ||
if (hit) { | ||
return true; | ||
} | ||
} | ||
return sliver.hitTest( | ||
result, | ||
mainAxisPosition: mainAxisPosition, | ||
crossAxisPosition: crossAxisPosition, | ||
); | ||
} | ||
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@override | ||
void paint(PaintingContext context, Offset offset) { | ||
final geometry = this.geometry!; | ||
final sliver = firstChild as RenderSliver; | ||
final footer = lastChild as RenderBox; | ||
context.paintChild(sliver, offset); | ||
context.paintChild( | ||
footer, | ||
Offset( | ||
offset.dx, | ||
offset.dy + | ||
geometry.paintOrigin + | ||
geometry.paintExtent - | ||
footer.size.height, | ||
), | ||
); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,24 @@ | ||
import 'package:flutter/widgets.dart'; | ||
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import 'rendering/sliver_with_pinned_footer.dart'; | ||
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/// [SliverWithPinnedFooter] adds the ability to have a pinned footer at the bottom of a sliver. | ||
/// | ||
/// The sliver will be layed out first and the footer will be added below if there | ||
/// is enough room left in the viewport. If there is not enough room then the footer | ||
/// will be painted on top of the sliver at the bottom of the painted area of the sliver. | ||
/// | ||
/// The total size of this sliver will be the paintExtent of the passed in sliver | ||
/// plus the height of the footer. | ||
class SliverWithPinnedFooter extends MultiChildRenderObjectWidget { | ||
SliverWithPinnedFooter({ | ||
Key? key, | ||
required Widget sliver, | ||
required Widget footer, | ||
}) : super(key: key, children: [sliver, footer]); | ||
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@override | ||
RenderObject createRenderObject(BuildContext context) { | ||
return RenderSliverWithPinnedFooter(); | ||
} | ||
} |
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To fix the footer appearing first, line 99 should be replaced with
min(footer.size.height, geometry.paintExtent)
(same for the hitTest)