mirror of
https://github.com/flutter/flutter
synced 2024-10-13 11:42:54 +00:00
170 lines
5.3 KiB
Dart
170 lines
5.3 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math' as math;
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import 'package:flutter/material.dart';
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import '../rendering/src/sector_layout.dart';
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RenderBoxToRenderSectorAdapter initCircle() {
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return RenderBoxToRenderSectorAdapter(
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innerRadius: 25.0,
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child: RenderSectorRing(padding: 0.0),
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);
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}
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class SectorApp extends StatefulWidget {
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const SectorApp({Key? key}) : super(key: key);
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@override
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SectorAppState createState() => SectorAppState();
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}
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class SectorAppState extends State<SectorApp> {
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final RenderBoxToRenderSectorAdapter sectors = initCircle();
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final math.Random rand = math.Random(1);
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List<double> wantedSectorSizes = <double>[];
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List<double> actualSectorSizes = <double>[];
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double get currentTheta => wantedSectorSizes.fold<double>(0.0, (double total, double value) => total + value);
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void addSector() {
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final double currentTheta = this.currentTheta;
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if (currentTheta < kTwoPi) {
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double deltaTheta;
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if (currentTheta >= kTwoPi - (math.pi * 0.2 + 0.05))
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deltaTheta = kTwoPi - currentTheta;
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else
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deltaTheta = math.pi * rand.nextDouble() / 5.0 + 0.05;
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wantedSectorSizes.add(deltaTheta);
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updateEnabledState();
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}
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}
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void removeSector() {
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if (wantedSectorSizes.isNotEmpty) {
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wantedSectorSizes.removeLast();
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updateEnabledState();
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}
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}
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void doUpdates() {
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int index = 0;
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while (index < actualSectorSizes.length && index < wantedSectorSizes.length && actualSectorSizes[index] == wantedSectorSizes[index])
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index += 1;
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final RenderSectorRing ring = sectors.child! as RenderSectorRing;
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while (index < actualSectorSizes.length) {
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ring.remove(ring.lastChild!);
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actualSectorSizes.removeLast();
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}
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while (index < wantedSectorSizes.length) {
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final Color color = Color(((0xFF << 24) + rand.nextInt(0xFFFFFF)) | 0x808080);
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ring.add(RenderSolidColor(color, desiredDeltaTheta: wantedSectorSizes[index]));
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actualSectorSizes.add(wantedSectorSizes[index]);
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index += 1;
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}
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}
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static RenderBoxToRenderSectorAdapter initSector(Color color) {
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final RenderSectorRing ring = RenderSectorRing(padding: 1.0);
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ring.add(RenderSolidColor(const Color(0xFF909090), desiredDeltaTheta: kTwoPi * 0.15));
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ring.add(RenderSolidColor(const Color(0xFF909090), desiredDeltaTheta: kTwoPi * 0.15));
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ring.add(RenderSolidColor(color, desiredDeltaTheta: kTwoPi * 0.2));
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return RenderBoxToRenderSectorAdapter(
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innerRadius: 5.0,
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child: ring,
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);
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}
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RenderBoxToRenderSectorAdapter sectorAddIcon = initSector(const Color(0xFF00DD00));
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RenderBoxToRenderSectorAdapter sectorRemoveIcon = initSector(const Color(0xFFDD0000));
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bool _enabledAdd = true;
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bool _enabledRemove = false;
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void updateEnabledState() {
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setState(() {
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_enabledAdd = currentTheta < kTwoPi;
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_enabledRemove = wantedSectorSizes.isNotEmpty;
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});
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}
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Widget buildBody() {
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return Column(
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children: <Widget>[
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Container(
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padding: const EdgeInsets.symmetric(horizontal: 8.0, vertical: 25.0),
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child: Row(
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children: <Widget>[
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ElevatedButton(
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onPressed: _enabledAdd ? addSector : null,
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child: IntrinsicWidth(
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child: Row(
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children: <Widget>[
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Container(
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padding: const EdgeInsets.all(4.0),
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margin: const EdgeInsets.only(right: 10.0),
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child: WidgetToRenderBoxAdapter(renderBox: sectorAddIcon),
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),
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const Text('ADD SECTOR'),
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],
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),
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),
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),
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ElevatedButton(
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onPressed: _enabledRemove ? removeSector : null,
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child: IntrinsicWidth(
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child: Row(
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children: <Widget>[
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Container(
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padding: const EdgeInsets.all(4.0),
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margin: const EdgeInsets.only(right: 10.0),
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child: WidgetToRenderBoxAdapter(renderBox: sectorRemoveIcon),
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),
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const Text('REMOVE SECTOR'),
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],
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),
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),
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),
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],
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mainAxisAlignment: MainAxisAlignment.spaceAround,
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),
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),
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Expanded(
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child: Container(
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margin: const EdgeInsets.all(8.0),
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decoration: BoxDecoration(
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border: Border.all()
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),
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padding: const EdgeInsets.all(8.0),
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child: WidgetToRenderBoxAdapter(
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renderBox: sectors,
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onBuild: doUpdates,
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),
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),
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),
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],
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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);
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}
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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theme: ThemeData.light(),
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title: 'Sector Layout',
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home: Scaffold(
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appBar: AppBar(
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title: const Text('Sector Layout in a Widget Tree'),
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),
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body: buildBody(),
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),
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);
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}
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}
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void main() {
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runApp(const SectorApp());
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}
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