flutter/examples/rendering/spinning_flex.dart
Ian Hickson a94999ba50 Clean up imports and exports.
Each layer is supposed to reexport the parts of the previous layer
that are part of its API.

- In painting.dart, export from dart:ui all the Canvas-related APIs
  that make sense to be used at higher levels, e.g. PaintingStyle.

- Delete painting/shadows.dart. It was dead code.

- In rendering/object.dart, export all of painting.dart.

- In widgets/basic.dart, export all of painting.dart and
  animation.dart. Some classes in animation/ are renamed to make this
  less disruptive and confusing to the namespace.

- Split out Stocks back into an import model rather than a part model,
  so that it's easier to manage its dependencies on a per-file basis.

- Move Ticker to scheduler library.

- Remove as many redundant imports as possible now.

- Some minor nit picking cleanup in various files.
2016-02-11 00:06:23 -08:00

44 lines
1.6 KiB
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 'package:flutter/rendering.dart';
import 'lib/solid_color_box.dart';
Duration timeBase;
RenderTransform transformBox;
void main() {
RenderFlex flexRoot = new RenderFlex(direction: FlexDirection.vertical);
void addFlexChildSolidColor(RenderFlex parent, Color backgroundColor, { int flex: 0 }) {
RenderSolidColorBox child = new RenderSolidColorBox(backgroundColor);
parent.add(child);
final FlexParentData childParentData = child.parentData;
childParentData.flex = flex;
}
addFlexChildSolidColor(flexRoot, const Color(0xFFFF00FF), flex: 1);
addFlexChildSolidColor(flexRoot, const Color(0xFFFFFF00), flex: 2);
addFlexChildSolidColor(flexRoot, const Color(0xFF00FFFF), flex: 1);
transformBox = new RenderTransform(child: flexRoot, transform: new Matrix4.identity());
RenderPadding root = new RenderPadding(padding: new EdgeDims.all(20.0), child: transformBox);
new RenderingFlutterBinding(root: root)
..addPersistentFrameCallback(rotate);
}
void rotate(Duration timeStamp) {
if (timeBase == null)
timeBase = timeStamp;
double delta = (timeStamp - timeBase).inMicroseconds.toDouble() / Duration.MICROSECONDS_PER_SECOND; // radians
transformBox.setIdentity();
transformBox.translate(transformBox.size.width / 2.0, transformBox.size.height / 2.0);
transformBox.rotateZ(delta);
transformBox.translate(-transformBox.size.width / 2.0, -transformBox.size.height / 2.0);
}