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// 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';
import 'package:flutter/rendering.dart';
import '../rendering/src/solid_color_box.dart';
// Solid color, RenderObject version
void addFlexChildSolidColor(RenderFlex parent, Color backgroundColor, { int flex = 0 }) {
final RenderSolidColorBox child = RenderSolidColorBox(backgroundColor);
parent.add(child);
final FlexParentData childParentData = child.parentData! as FlexParentData;
childParentData.flex = flex;
}
// Solid color, Widget version
class Rectangle extends StatelessWidget {
const Rectangle(this.color, { Key? key }) : super(key: key);
final Color color;
@override
Widget build(BuildContext context) {
return Expanded(
child: Container(
color: color,
),
);
}
}
double? value;
RenderObjectToWidgetElement<RenderBox>? element;
void attachWidgetTreeToRenderTree(RenderProxyBox container) {
element = RenderObjectToWidgetAdapter<RenderBox>(
container: container,
child: Directionality(
textDirection: TextDirection.ltr,
child: SizedBox(
height: 300.0,
child: Column(
children: <Widget>[
const Rectangle(Color(0xFF00FFFF)),
Material(
child: Container(
padding: const EdgeInsets.all(10.0),
margin: const EdgeInsets.all(10.0),
child: Row(
children: <Widget>[
ElevatedButton(
child: Row(
children: <Widget>[
Image.network('https://flutter.dev/images/favicon.png'),
const Text('PRESS ME'),
],
),
onPressed: () {
value = value == null ? 0.1 : (value! + 0.1) % 1.0;
attachWidgetTreeToRenderTree(container);
},
),
CircularProgressIndicator(value: value),
],
mainAxisAlignment: MainAxisAlignment.spaceAround,
),
),
),
const Rectangle(Color(0xFFFFFF00)),
],
mainAxisAlignment: MainAxisAlignment.spaceBetween,
),
),
),
).attachToRenderTree(WidgetsBinding.instance!.buildOwner!, element);
}
Duration? timeBase;
late RenderTransform transformBox;
void rotate(Duration timeStamp) {
timeBase ??= timeStamp;
final double delta = (timeStamp - timeBase!).inMicroseconds.toDouble() / Duration.microsecondsPerSecond; // radians
transformBox.setIdentity();
transformBox.rotateZ(delta);
WidgetsBinding.instance!.buildOwner!.buildScope(element!);
}
void main() {
final WidgetsBinding binding = WidgetsFlutterBinding.ensureInitialized();
final RenderProxyBox proxy = RenderProxyBox();
attachWidgetTreeToRenderTree(proxy);
final RenderFlex flexRoot = RenderFlex(direction: Axis.vertical);
addFlexChildSolidColor(flexRoot, const Color(0xFFFF00FF), flex: 1);
flexRoot.add(proxy);
addFlexChildSolidColor(flexRoot, const Color(0xFF0000FF), flex: 1);
transformBox = RenderTransform(child: flexRoot, transform: Matrix4.identity(), alignment: Alignment.center);
final RenderPadding root = RenderPadding(padding: const EdgeInsets.all(80.0), child: transformBox);
binding.renderView.child = root;
binding.addPersistentFrameCallback(rotate);
}