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feat: grid jump to index (#1004)

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My-Responsitories
2025-08-12 17:06:33 +08:00
committed by GitHub
parent e00c176bdf
commit 690c4f5786
4 changed files with 38 additions and 12 deletions
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13
lib/utils/grid.dart
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@@ -26,7 +26,7 @@ class SliverGridDelegateWithExtentAndRatio extends SliverGridDelegate {
/// The [maxCrossAxisExtent], [mainAxisExtent], [mainAxisSpacing],
/// and [crossAxisSpacing] arguments must not be negative.
/// The [childAspectRatio] argument must be greater than zero.
const SliverGridDelegateWithExtentAndRatio({
SliverGridDelegateWithExtentAndRatio({
required this.maxCrossAxisExtent,
this.mainAxisSpacing = 0.0,
this.crossAxisSpacing = 0.0,
@@ -76,9 +76,13 @@ class SliverGridDelegateWithExtentAndRatio extends SliverGridDelegate {
return true;
}
SliverGridLayout? layoutCache;
@override
SliverGridLayout getLayout(SliverConstraints constraints) {
// invoked before each frame
assert(_debugAssertIsValid(constraints.crossAxisExtent));
if (layoutCache != null) return layoutCache!;
int crossAxisCount =
((constraints.crossAxisExtent - crossAxisSpacing) /
(maxCrossAxisExtent + crossAxisSpacing))
@@ -95,7 +99,7 @@ class SliverGridDelegateWithExtentAndRatio extends SliverGridDelegate {
minHeight,
childCrossAxisExtent / childAspectRatio + mainAxisExtent,
);
return SliverGridRegularTileLayout(
return layoutCache = SliverGridRegularTileLayout(
crossAxisCount: crossAxisCount,
mainAxisStride: childMainAxisExtent + mainAxisSpacing,
crossAxisStride: childCrossAxisExtent + crossAxisSpacing,
@@ -107,10 +111,13 @@ class SliverGridDelegateWithExtentAndRatio extends SliverGridDelegate {
@override
bool shouldRelayout(SliverGridDelegateWithExtentAndRatio oldDelegate) {
return oldDelegate.maxCrossAxisExtent != maxCrossAxisExtent ||
final flag =
oldDelegate.maxCrossAxisExtent != maxCrossAxisExtent ||
oldDelegate.mainAxisSpacing != mainAxisSpacing ||
oldDelegate.crossAxisSpacing != crossAxisSpacing ||
oldDelegate.childAspectRatio != childAspectRatio ||
oldDelegate.mainAxisExtent != mainAxisExtent;
if (flag) layoutCache = null;
return flag;
}
}