flutter/examples/widgets/sector.dart

// Copyright 2015 The Chromium 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 'dart:math' as math;

import 'package:sky/rendering/box.dart';
import 'package:sky/rendering/flex.dart';
import 'package:sky/rendering/sky_binding.dart';
import 'package:sky/theme2/colors.dart';
import 'package:sky/theme2/edges.dart';
import 'package:sky/theme2/typography.dart';
import 'package:sky/widgets/basic.dart';
import 'package:sky/widgets/material.dart';
import 'package:sky/widgets/raised_button.dart';
import 'package:sky/widgets/scaffold.dart';
import 'package:sky/widgets/tool_bar.dart';
import 'package:sky/widgets/widget.dart';

import '../rendering/sector_layout.dart';

RenderBox initCircle() {
  return new RenderBoxToRenderSectorAdapter(
    innerRadius: 25.0,
    child: new RenderSectorRing(padding: 0.0)
  );
}

class SectorApp extends App {

  RenderBoxToRenderSectorAdapter sectors = initCircle();
  math.Random rand = new math.Random(1);

  void addSector() {
    double deltaTheta;
    var ring = (sectors.child as RenderSectorRing);
    SectorDimensions currentSize = ring.getIntrinsicDimensions(const SectorConstraints(), ring.deltaRadius);
    if (currentSize.deltaTheta >= kTwoPi - (math.PI * 0.2 + 0.05))
      deltaTheta = kTwoPi - currentSize.deltaTheta;
    else
      deltaTheta = math.PI * rand.nextDouble() / 5.0 + 0.05;
    Color color = new Color(((0xFF << 24) + rand.nextInt(0xFFFFFF)) | 0x808080);
    ring.add(new RenderSolidColor(color, desiredDeltaTheta: deltaTheta));
    updateEnabledState();
  }

  void removeSector() {
    (sectors.child as RenderSectorRing).remove((sectors.child as RenderSectorRing).lastChild);
    updateEnabledState();
  }

  static RenderBox initSector(Color color) {
    RenderSectorRing ring = new RenderSectorRing(padding: 1.0);
    ring.add(new RenderSolidColor(const Color(0xFF909090), desiredDeltaTheta: kTwoPi * 0.15));
    ring.add(new RenderSolidColor(const Color(0xFF909090), desiredDeltaTheta: kTwoPi * 0.15));
    ring.add(new RenderSolidColor(color, desiredDeltaTheta: kTwoPi * 0.2));
    return new RenderBoxToRenderSectorAdapter(
      innerRadius: 5.0,
      child: ring
    );
  }
  RenderBoxToRenderSectorAdapter sectorAddIcon = initSector(const Color(0xFF00DD00));
  RenderBoxToRenderSectorAdapter sectorRemoveIcon = initSector(const Color(0xFFDD0000));

  bool enabledAdd = true;
  bool enabledRemove = false;
  void updateEnabledState() {
    setState(() {
      var ring = (sectors.child as RenderSectorRing);
      SectorDimensions currentSize = ring.getIntrinsicDimensions(const SectorConstraints(), ring.deltaRadius);
      enabledAdd = currentSize.deltaTheta < kTwoPi;
      enabledRemove = ring.firstChild != null;
    });
  }

  Widget build() {
    return new Scaffold(
      toolbar: new ToolBar(
          center: new Text('Sector Layout in a Widget Tree', style: white.title),
          backgroundColor: Blue[500]),
      body: new Material(
        edge: MaterialEdge.canvas,
        child: new Flex([
            new Container(
              padding: new EdgeDims.symmetric(horizontal: 8.0, vertical: 25.0),
              child: new Flex([
                  new RaisedButton(
                    enabled: enabledAdd,
                    child: new ShrinkWrapWidth(
                      child: new Flex([
                        new Container(
                          padding: new EdgeDims.all(4.0),
                          margin: new EdgeDims.only(right: 10.0),
                          child: new WidgetToRenderBoxAdapter(sectorAddIcon)
                        ),
                        new Text('ADD SECTOR'),
                      ])
                    ),
                    onPressed: addSector
                  ),
                  new RaisedButton(
                    enabled: enabledRemove,
                    child: new ShrinkWrapWidth(
                      child: new Flex([
                        new Container(
                          padding: new EdgeDims.all(4.0),
                          margin: new EdgeDims.only(right: 10.0),
                          child: new WidgetToRenderBoxAdapter(sectorRemoveIcon)
                        ),
                        new Text('REMOVE SECTOR'),
                      ])
                    ),
                    onPressed: removeSector
                  )
                ],
                justifyContent: FlexJustifyContent.spaceAround
              )
            ),
            new Flexible(
              child: new Container(
                margin: new EdgeDims.all(8.0),
                decoration: new BoxDecoration(
                  border: new Border.all(new BorderSide(color: new Color(0xFF000000)))
                ),
                padding: new EdgeDims.all(8.0),
                child: new WidgetToRenderBoxAdapter(sectors)
              )
            ),
          ],
          direction: FlexDirection.vertical,
          justifyContent: FlexJustifyContent.spaceBetween
        )
      )
    );
  }
}

void main() {
  runApp(new SectorApp());
  SkyBinding.instance.onFrame = () {
    // uncomment this for debugging:
    // SkyBinding.instance.debugDumpRenderTree();
  };
}