protected override Widget Build(BuildContext context)
{
Widget MakeContainer(int w, int h, int n) => new Container(
size: WidgetSize.Fixed(w, h),
backgroundColor: Color.Lerp(Color.blue, Color.green, n / 15f)
);
return(new Container(
backgroundColor: Color.gray,
child: new ScrollList(
crossAxisAlignment: CrossAxisAlignment.Center,
mainAxisAlignment: MainAxisAlignment.Center,
children: new List <Widget>
{
MakeContainer(100, 100, 1),
MakeContainer(120, 110, 2),
MakeContainer(110, 120, 3),
MakeContainer(100, 140, 4),
MakeContainer(150, 110, 5),
MakeContainer(110, 100, 6),
MakeContainer(100, 100, 7),
MakeContainer(120, 110, 8),
MakeContainer(100, 100, 9),
MakeContainer(100, 100, 10),
}
)
));
}
protected override Widget Build(BuildContext context)
{
return(new Container(
size: WidgetSize.Stretched,
backgroundColor: Color.white,
child: new CompositeTransition(
opacity: _opacity,
position: _position,
rotation: _rotation,
child: new Container(
size: WidgetSize.Fixed(300, 200),
backgroundColor: Color.black
)
)
));
}
private WidgetSize CalculateInnerSize()
{
var width = 0f;
var height = 0f;
var lineWidth = 0.0f;
var lineHeight = 0.0f;
var lineChildNum = 0;
var maxLineWidth = Widget.MaxCrossAxisExtent;
var maxLineChildNum = Widget.MaxCrossAxisCount;
foreach (var child in Children)
{
var childSize = child.Size;
if (float.IsInfinity(childSize.MaxWidth) || float.IsInfinity(childSize.MaxHeight))
{
continue;
}
if (lineChildNum + 1 <= maxLineChildNum &&
lineWidth + childSize.MaxWidth <= maxLineWidth)
{
lineChildNum++;
lineWidth += childSize.MaxWidth;
lineHeight = Math.Max(lineHeight, childSize.MaxHeight);
}
else
{
width = Math.Max(width, lineWidth);
height += lineHeight;
lineChildNum = 1;
lineWidth = childSize.MaxWidth;
lineHeight = childSize.MaxHeight;
}
}
width = Math.Max(width, lineWidth);
height += lineHeight;
width = Math.Min(width, MaxCrossAxisExtent);
return(WidgetSize.Fixed(width, height));
}
public override WidgetSize CalculateSize() => WidgetSize.Fixed(0, 0);