95 lines
2.7 KiB
Dart
95 lines
2.7 KiB
Dart
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import 'package:flutter/material.dart';
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typedef AnimatedGridBuilder<T> = Widget Function(BuildContext, T item);
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class AnimateGrid<T> extends StatelessWidget {
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final int columns;
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final double itemHeight;
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final double gap;
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final List<T> items;
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final Key Function(T item) keyBuilder;
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final AnimatedGridBuilder<T> builder;
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final Duration duration;
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final Curve curve;
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const AnimateGrid({
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super.key,
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required this.items,
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required this.itemHeight,
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required this.keyBuilder,
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required this.builder,
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this.gap = 8,
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this.duration = const Duration(milliseconds: 300),
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this.curve = Curves.easeOut,
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this.columns = 2,
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});
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int _rows(int columns, int count) => (count / columns).ceil();
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Offset _getOffset(
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int index,
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int count,
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double itemWidth,
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double itemHeight,
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) {
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final xIndex = index % columns;
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final yIndex = (index / columns).floor();
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return Offset(
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xIndex * itemWidth + xIndex * gap, yIndex * itemHeight + yIndex * gap);
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}
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@override
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Widget build(BuildContext context) {
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return LayoutBuilder(builder: (_, constraints) {
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assert(constraints.hasBoundedHeight == false);
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final gapWidth = (columns - 1) * gap;
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final width = constraints.maxWidth;
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final itemWidth = (width - gapWidth) / columns;
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final count = items.length;
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final rows = _rows(columns, count);
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final gapHeight = (rows - 1) * gap;
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final height = rows * itemHeight + gapHeight;
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return SizedBox(
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width: width,
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height: height,
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child: Stack(
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children: [
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for (var i = 0; i <= count - 1; i++)
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Builder(
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key: keyBuilder(items[i]),
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builder: (context) {
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final item = items[i];
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final offset = _getOffset(
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i,
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count,
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itemWidth,
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itemHeight,
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);
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return TweenAnimationBuilder(
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tween: Tween<Offset>(end: offset),
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duration: duration,
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curve: curve,
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builder: (_, offset, child) {
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return Transform.translate(
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offset: offset,
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child: child,
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);
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},
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child: SizedBox(
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height: itemHeight,
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width: itemWidth,
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child: builder(
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context,
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item,
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),
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),
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);
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},
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),
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],
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),
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);
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});
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}
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}
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