private void CalculateBlockWidth(Dimensions containingBlock)
{
var style = GetStyleNode();
var auto = new Css.Keyword("auto");
var width = style.GetValue("width") ?? auto;
var zero = Css.Length.Zero(Css.Unit.Px);
var marginLeft = style.Lookup("margin-left", "margin", zero);
var marginRight = style.Lookup("margin-right", "margin", zero);
var borderLeft = style.Lookup("border-left-width", "border-width", zero);
var borderRight = style.Lookup("border-right-width", "border-width", zero);
var paddingLeft = style.Lookup("padding-left", "padding", zero);
var paddingRight = style.Lookup("padding-right", "padding", zero);
var total = new Css.Value[] {
marginLeft, marginRight, borderLeft, borderRight,
paddingLeft, paddingRight, width
}.Select(v => v.ToPx()).Sum();
if (width != auto && total > containingBlock.Content.Width)
{
if (marginLeft == auto)
{
marginLeft = Css.Length.Zero(Css.Unit.Px);
}
if (marginRight == auto)
{
marginRight = Css.Length.Zero(Css.Unit.Px);
}
}
var underflow = containingBlock.Content.Width - total;
if (width != auto && marginLeft != auto && marginRight != auto)
{
marginRight = new Css.Length(marginRight.ToPx(), Css.Unit.Px);
}
else if (width != auto && marginLeft != auto && marginRight == auto)
{
marginRight = new Css.Length(underflow, Css.Unit.Px);
}
else if (width != auto && marginLeft == auto && marginRight != auto)
{
marginRight = new Css.Length(underflow, Css.Unit.Px);
}
else if (width == auto)
{
if (marginLeft == auto)
{
marginLeft = Css.Length.Zero(Css.Unit.Px);
}
if (marginRight == auto)
{
marginRight = Css.Length.Zero(Css.Unit.Px);
}
if (underflow >= 0)
{
width = new Css.Length(underflow, Css.Unit.Px);
}
else
{
width = Css.Length.Zero(Css.Unit.Px);
marginRight = new Css.Length(marginRight.ToPx() + underflow, Css.Unit.Px);
}
}
else if (width != auto && marginLeft == auto && marginRight == auto)
{
marginLeft = new Css.Length(underflow / 2, Css.Unit.Px);
marginRight = new Css.Length(underflow / 2, Css.Unit.Px);
}
Dimensions.Content.Width = width.ToPx();
Dimensions.Padding.Left = paddingLeft.ToPx();
Dimensions.Padding.Right = paddingRight.ToPx();
Dimensions.Border.Left = borderLeft.ToPx();
Dimensions.Border.Right = borderRight.ToPx();
Dimensions.Margin.Left = marginLeft.ToPx();
Dimensions.Margin.Right = marginRight.ToPx();
}
public Css.Value Lookup(string name, string fallbackName, Css.Value defaultValue)
{
return(GetValue(name) ?? GetValue(fallbackName) ?? defaultValue);
}