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format code
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@CarGuo
CarGuo committed Apr 26, 2023
1 parent 5f91deb commit a6e89ea
Showing 1 changed file with 76 additions and 77 deletions.
153 changes: 76 additions & 77 deletions lib/widget/un_bounded_listview.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,8 @@ class UnboundedListViewDemoPage extends StatefulWidget {
const UnboundedListViewDemoPage({Key? key}) : super(key: key);

@override
State<UnboundedListViewDemoPage> createState() => _UnboundedListViewDemoPageState();
State<UnboundedListViewDemoPage> createState() =>
_UnboundedListViewDemoPageState();
}

class _UnboundedListViewDemoPageState extends State<UnboundedListViewDemoPage> {
Expand Down Expand Up @@ -50,7 +51,7 @@ class _UnboundedListViewDemoPageState extends State<UnboundedListViewDemoPage> {
alignment: Alignment.bottomCenter,
color: Colors.blue,
child: Text(List.generate(
math.Random().nextInt(10), (index) => "TEST\n")
math.Random().nextInt(10), (index) => "TEST\n")
.toString()),
),
);
Expand Down Expand Up @@ -134,11 +135,11 @@ mixin UnboundedListViewMixin on ListView {

@protected
Widget buildViewport(
BuildContext context,
ViewportOffset offset,
AxisDirection axisDirection,
List<Widget> slivers,
) {
BuildContext context,
ViewportOffset offset,
AxisDirection axisDirection,
List<Widget> slivers,
) {
// TODO: support shrinkWrap
// if (shrinkWrap) {
// return UnboundedShrinkWrappingViewport(
Expand All @@ -164,9 +165,9 @@ mixin UnboundedListViewMixin on ListView {
if (mediaQuery != null) {
// Automatically pad sliver with padding from MediaQuery.
final EdgeInsets mediaQueryHorizontalPadding =
mediaQuery.padding.copyWith(top: 0.0, bottom: 0.0);
mediaQuery.padding.copyWith(top: 0.0, bottom: 0.0);
final EdgeInsets mediaQueryVerticalPadding =
mediaQuery.padding.copyWith(left: 0.0, right: 0.0);
mediaQuery.padding.copyWith(left: 0.0, right: 0.0);
// Consume the main axis padding with SliverPadding.
effectivePadding = scrollDirection == Axis.vertical
? mediaQueryVerticalPadding
Expand Down Expand Up @@ -214,7 +215,7 @@ mixin UnboundedRenderSliverPaddingMixin on RenderSliverPadding {
}

UnboundedSliverGeometry childGeometry =
child!.geometry! as UnboundedSliverGeometry;
child!.geometry! as UnboundedSliverGeometry;
geometry = UnboundedSliverGeometry(
existing: geometry,
crossAxisSize: childGeometry.crossAxisSize + padding.vertical);
Expand All @@ -226,7 +227,7 @@ mixin UnboundedSliverListMixin on SliverList {
@override
RenderSliverList createRenderObject(BuildContext context) {
final SliverMultiBoxAdaptorElement element =
context as SliverMultiBoxAdaptorElement;
context as SliverMultiBoxAdaptorElement;
return UnboundedRenderSliverList(childManager: element);
}
}
Expand Down Expand Up @@ -346,15 +347,15 @@ class UnboundedRenderSliverList extends RenderSliverList {
// Find the last child that is at or before the scrollOffset.
earliestUsefulChild = firstChild;
for (double earliestScrollOffset = childScrollOffset(earliestUsefulChild!)!;
earliestScrollOffset > scrollOffset;
earliestScrollOffset = childScrollOffset(earliestUsefulChild)!) {
earliestScrollOffset > scrollOffset;
earliestScrollOffset = childScrollOffset(earliestUsefulChild)!) {
// We have to add children before the earliestUsefulChild.
earliestUsefulChild =
insertAndLayoutLeadingChild(childConstraints, parentUsesSize: true);
updateUnboundedSize(earliestUsefulChild);
if (earliestUsefulChild == null) {
final SliverMultiBoxAdaptorParentData childParentData =
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
childParentData.layoutOffset = 0.0;

if (scrollOffset == 0.0) {
Expand Down Expand Up @@ -388,13 +389,13 @@ class UnboundedRenderSliverList extends RenderSliverList {
scrollOffsetCorrection: -firstChildScrollOffset,
));
final SliverMultiBoxAdaptorParentData childParentData =
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
childParentData.layoutOffset = 0.0;
return;
}

final SliverMultiBoxAdaptorParentData childParentData =
earliestUsefulChild.parentData! as SliverMultiBoxAdaptorParentData;
earliestUsefulChild.parentData! as SliverMultiBoxAdaptorParentData;
childParentData.layoutOffset = firstChildScrollOffset;
assert(earliestUsefulChild == firstChild);
leadingChildWithLayout = earliestUsefulChild;
Expand All @@ -420,7 +421,7 @@ class UnboundedRenderSliverList extends RenderSliverList {
final double firstChildScrollOffset =
earliestScrollOffset - paintExtentOf(firstChild!);
final SliverMultiBoxAdaptorParentData childParentData =
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
firstChild!.parentData! as SliverMultiBoxAdaptorParentData;
childParentData.layoutOffset = 0.0;
// We only need to correct if the leading child actually has a
// paint extent.
Expand Down Expand Up @@ -490,7 +491,7 @@ class UnboundedRenderSliverList extends RenderSliverList {
}
assert(child != null);
final SliverMultiBoxAdaptorParentData childParentData =
child!.parentData! as SliverMultiBoxAdaptorParentData;
child!.parentData! as SliverMultiBoxAdaptorParentData;
childParentData.layoutOffset = endScrollOffset;
assert(childParentData.index == index);
endScrollOffset = childScrollOffset(child!)! + paintExtentOf(child!);
Expand Down Expand Up @@ -613,8 +614,6 @@ mixin UnboundedViewportMixin on Viewport {
class UnboundedRenderViewport = RenderViewport
with UnboundedRenderViewportMixin;
mixin UnboundedRenderViewportMixin on RenderViewport {


double unboundedSize = 0;

@override
Expand Down Expand Up @@ -647,70 +646,70 @@ mixin UnboundedRenderViewportMixin on RenderViewport {

@override
double layoutChildSequence({
required RenderSliver? child,
required double scrollOffset,
required double overlap,
required double layoutOffset,
required double remainingPaintExtent,
required double mainAxisExtent,
required double crossAxisExtent,
required GrowthDirection growthDirection,
required RenderSliver? advance(RenderSliver child),
required double remainingCacheExtent,
required double cacheOrigin,
}) {
crossAxisExtent = _unboundedSize;
var firstChild = child;

final result = super.layoutChildSequence(
child: child,
scrollOffset: scrollOffset,
overlap: overlap,
layoutOffset: layoutOffset,
remainingPaintExtent: remainingPaintExtent,
mainAxisExtent: mainAxisExtent,
crossAxisExtent: crossAxisExtent,
growthDirection: growthDirection,
advance: advance,
remainingCacheExtent: remainingCacheExtent,
cacheOrigin: cacheOrigin,
);

while (firstChild != null) {
if (firstChild.geometry is UnboundedSliverGeometry) {
final UnboundedSliverGeometry childGeometry =
firstChild.geometry as UnboundedSliverGeometry;
unboundedSize = math.max(unboundedSize, childGeometry.crossAxisSize);
}
firstChild = advance(firstChild);
}
if (axis == Axis.horizontal) {
size = Size(size.width, unboundedSize);
} else {
size = Size(unboundedSize, size.height);
}
required RenderSliver? child,
required double scrollOffset,
required double overlap,
required double layoutOffset,
required double remainingPaintExtent,
required double mainAxisExtent,
required double crossAxisExtent,
required GrowthDirection growthDirection,
required RenderSliver? advance(RenderSliver child),
required double remainingCacheExtent,
required double cacheOrigin,
}) {
crossAxisExtent = _unboundedSize;
var firstChild = child;

final result = super.layoutChildSequence(
child: child,
scrollOffset: scrollOffset,
overlap: overlap,
layoutOffset: layoutOffset,
remainingPaintExtent: remainingPaintExtent,
mainAxisExtent: mainAxisExtent,
crossAxisExtent: crossAxisExtent,
growthDirection: growthDirection,
advance: advance,
remainingCacheExtent: remainingCacheExtent,
cacheOrigin: cacheOrigin,
);

return result;
}
while (firstChild != null) {
if (firstChild.geometry is UnboundedSliverGeometry) {
final UnboundedSliverGeometry childGeometry =
firstChild.geometry as UnboundedSliverGeometry;
unboundedSize = math.max(unboundedSize, childGeometry.crossAxisSize);
}
firstChild = advance(firstChild);
}
if (axis == Axis.horizontal) {
size = Size(size.width, unboundedSize);
} else {
size = Size(unboundedSize, size.height);
}

return result;
}
}

class UnboundedSliverGeometry extends SliverGeometry {
UnboundedSliverGeometry(
{SliverGeometry? existing, required this.crossAxisSize})
: super(
scrollExtent: existing?.scrollExtent ?? 0.0,
paintExtent: existing?.paintExtent ?? 0.0,
paintOrigin: existing?.paintOrigin ?? 0.0,
layoutExtent: existing?.layoutExtent,
maxPaintExtent: existing?.maxPaintExtent ?? 0.0,
maxScrollObstructionExtent:
existing?.maxScrollObstructionExtent ?? 0.0,
hitTestExtent: existing?.hitTestExtent,
visible: existing?.visible,
hasVisualOverflow: existing?.hasVisualOverflow ?? false,
scrollOffsetCorrection: existing?.scrollOffsetCorrection,
cacheExtent: existing?.cacheExtent,
);
scrollExtent: existing?.scrollExtent ?? 0.0,
paintExtent: existing?.paintExtent ?? 0.0,
paintOrigin: existing?.paintOrigin ?? 0.0,
layoutExtent: existing?.layoutExtent,
maxPaintExtent: existing?.maxPaintExtent ?? 0.0,
maxScrollObstructionExtent:
existing?.maxScrollObstructionExtent ?? 0.0,
hitTestExtent: existing?.hitTestExtent,
visible: existing?.visible,
hasVisualOverflow: existing?.hasVisualOverflow ?? false,
scrollOffsetCorrection: existing?.scrollOffsetCorrection,
cacheExtent: existing?.cacheExtent,
);

final double crossAxisSize;
}

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