// 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:sky'; import 'package:cassowary/cassowary.dart' as al; import 'package:sky/rendering.dart'; void main() { RenderDecoratedBox c1 = new RenderDecoratedBox( decoration: new BoxDecoration(backgroundColor: const Color(0xFFFF0000)) ); RenderDecoratedBox c2 = new RenderDecoratedBox( decoration: new BoxDecoration(backgroundColor: const Color(0xFF00FF00)) ); RenderDecoratedBox c3 = new RenderDecoratedBox( decoration: new BoxDecoration(backgroundColor: const Color(0xFF0000FF)) ); RenderDecoratedBox c4 = new RenderDecoratedBox( decoration: new BoxDecoration(backgroundColor: const Color(0xFFFFFFFF)) ); RenderAutoLayout root = new RenderAutoLayout(children: [c1, c2, c3, c4]); AutoLayoutParentData p1 = c1.parentData; AutoLayoutParentData p2 = c2.parentData; AutoLayoutParentData p3 = c3.parentData; AutoLayoutParentData p4 = c4.parentData; root.addConstraints(<al.Constraint>[ // Sum of widths of each box must be equal to that of the container (p1.width + p2.width + p3.width == root.width) as al.Constraint, // The boxes must be stacked left to right p1.rightEdge <= p2.leftEdge, p2.rightEdge <= p3.leftEdge, // The widths of the first and the third boxes should be equal (p1.width == p3.width) as al.Constraint, // The width of the second box should be twice as much as that of the first // and third (p2.width * al.cm(2.0) == p1.width) as al.Constraint, // The height of the three boxes should be equal to that of the container (p1.height == p2.height) as al.Constraint, (p2.height == p3.height) as al.Constraint, (p3.height == root.height) as al.Constraint, // The fourth box should be half as wide as the second and must be attached // to the right edge of the same (by its center) (p4.width == p2.width / al.cm(2.0)) as al.Constraint, (p4.height == al.cm(50.0)) as al.Constraint, (p4.horizontalCenter == p2.rightEdge) as al.Constraint, (p4.verticalCenter == p2.height / al.cm(2.0)) as al.Constraint, ]); new SkyBinding(root: root); }