blob: 054676d1a62a65d1e6ceecc4d69adbeffac04cb9 [file] [log] [blame]
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
class MultiWidgetConstructTable extends StatefulWidget {
const MultiWidgetConstructTable(this.columnCount, this.rowCount, {super.key});
final int columnCount;
final int rowCount;
@override
State<MultiWidgetConstructTable> createState() => _MultiWidgetConstructTableState();
}
class _MultiWidgetConstructTableState extends State<MultiWidgetConstructTable>
with SingleTickerProviderStateMixin {
static const List<MaterialColor> colorList = <MaterialColor>[
Colors.pink, Colors.red, Colors.deepOrange, Colors.orange, Colors.amber,
Colors.yellow, Colors.lime, Colors.lightGreen, Colors.green, Colors.teal,
Colors.cyan, Colors.lightBlue, Colors.blue, Colors.indigo, Colors.purple,
];
int counter = 0;
late AnimationController _controller;
@override
void initState() {
super.initState();
_controller = AnimationController(
vsync: this,
duration: const Duration(milliseconds: 10000),
upperBound: colorList.length + 1.0,
)..repeat();
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _controller,
builder: (BuildContext context, _) {
final int totalLength = widget.rowCount * widget.columnCount;
final int widgetCounter = counter * totalLength;
final double height = MediaQuery.of(context).size.height / widget.rowCount;
final double colorPosition = _controller.value;
final int c1Position = colorPosition.floor();
final Color c1 = colorList[c1Position % colorList.length][900]!;
final Color c2 = colorList[(c1Position + 1) % colorList.length][900]!;
final Color baseColor = Color.lerp(c1, c2, colorPosition - c1Position)!;
counter++;
return Scaffold(
body: Table(
children: List<TableRow>.generate(
widget.rowCount,
(int row) => TableRow(
children: List<Widget>.generate(
widget.columnCount,
(int column) {
final int label = row * widget.columnCount + column;
// This implementation rebuild the widget tree for every
// frame, and is intentionally designed of poor performance
// for benchmark purposes.
return counter.isEven
? Container(
// This key forces rebuilding the element
key: ValueKey<int>(widgetCounter + label),
color: Color.lerp(
Colors.white, baseColor, label / totalLength),
constraints: BoxConstraints.expand(height: height),
child: Text('${widgetCounter + label}'),
)
: MyContainer(
// This key forces rebuilding the element
key: ValueKey<int>(widgetCounter + label),
color: Color.lerp(
Colors.white, baseColor, label / totalLength)!,
constraints: BoxConstraints.expand(height: height),
child: Text('${widgetCounter + label}'),
);
},
),
),
),
),
);
},
);
}
}
// This class is intended to break the original Widget tree
class MyContainer extends StatelessWidget {
const MyContainer({required this.color, required this.child, required this.constraints, super.key});
final Color color;
final Widget child;
final BoxConstraints constraints;
@override
Widget build(BuildContext context) {
return Container(
color: color,
constraints: constraints,
child: child,
);
}
}