/// <summary>
/// Gets the result of collapsing the vertical margins of the two boxes
/// </summary>
/// <param name="prevSibling">the previous box under the same parent</param>
/// <returns>Resulting top margin</returns>
private float MarginTopCollapse(CssBoxProperties prevSibling)
{
float value;
if (prevSibling != null)
{
value = Math.Max(prevSibling.ActualMarginBottom, ActualMarginTop);
CollapsedMarginTop = value;
}
else if (_parentBox != null && ActualPaddingTop < 0.1 && ActualPaddingBottom < 0.1 && _parentBox.ActualPaddingTop < 0.1 && _parentBox.ActualPaddingBottom < 0.1)
{
value = Math.Max(0, ActualMarginTop - Math.Max(_parentBox.ActualMarginTop, _parentBox.CollapsedMarginTop));
}
else
{
value = ActualMarginTop;
}
// fix for hr tag
if (value < 0.1 && HtmlTag != null && HtmlTag.Name == "hr")
{
value = GetEmHeight() * 1.1f;
}
return(value);
}
/// <summary>
/// Parses a border value in CSS style; e.g. 1px, 1, thin, thick, medium
/// </summary>
/// <param name="borderValue"></param>
/// <param name="b"></param>
/// <returns></returns>
public static float GetActualBorderWidth(string borderValue, CssBoxProperties b)
{
if (string.IsNullOrEmpty(borderValue))
{
return GetActualBorderWidth(CssConstants.Medium, b);
}
switch (borderValue)
{
case CssConstants.Thin:
return 1f;
case CssConstants.Medium:
return 2f;
case CssConstants.Thick:
return 4f;
default:
return Math.Abs(ParseLength(borderValue, 1, b));
}
}
/// <summary>
/// Gets the white space width of the specified box
/// </summary>
/// <param name="g"></param>
/// <param name="box"></param>
/// <returns></returns>
public static float WhiteSpace(IGraphics g, CssBoxProperties box)
{
float w = FontsUtils.MeasureWhitespace(g, box.ActualFont);
if (!(String.IsNullOrEmpty(box.WordSpacing) || box.WordSpacing == CssConstants.Normal))
{
w += CssValueParser.ParseLength(box.WordSpacing, 0, box, true);
}
return w;
}
/// <summary>
/// Parses a length. Lengths are followed by an unit identifier (e.g. 10px, 3.1em)
/// </summary>
/// <param name="length">Specified length</param>
/// <param name="hundredPercent">Equivalent to 100 percent when length is percentage</param>
/// <param name="fontAdjust">if the length is in pixels and the length is font related it needs to use 72/96 factor</param>
/// <param name="box"></param>
/// <returns>the parsed length value with adjustments</returns>
public static float ParseLength(string length, float hundredPercent, CssBoxProperties box, bool fontAdjust = false)
{
return ParseLength(length, hundredPercent, box.GetEmHeight(), fontAdjust, false);
}
/// <summary>
/// Get the border width for the given box border.
/// </summary>
private static float GetWidth(Border border, CssBoxProperties box)
{
switch (border)
{
case Border.Top:
return box.ActualBorderTopWidth;
case Border.Right:
return box.ActualBorderRightWidth;
case Border.Bottom:
return box.ActualBorderBottomWidth;
case Border.Left:
return box.ActualBorderLeftWidth;
default:
throw new ArgumentOutOfRangeException("border");
}
}
/// <summary>
/// Get the border style for the given box border.
/// </summary>
private static string GetStyle(Border border, CssBoxProperties box)
{
switch (border)
{
case Border.Top:
return box.BorderTopStyle;
case Border.Right:
return box.BorderRightStyle;
case Border.Bottom:
return box.BorderBottomStyle;
case Border.Left:
return box.BorderLeftStyle;
default:
throw new ArgumentOutOfRangeException("border");
}
}
/// <summary>
/// Get the border color for the given box border.
/// </summary>
private static Color GetColor(Border border, CssBoxProperties box, string style)
{
switch (border)
{
case Border.Top:
return style == CssConstants.Inset ? Darken(box.ActualBorderTopColor) : box.ActualBorderTopColor;
case Border.Right:
return style == CssConstants.Outset ? Darken(box.ActualBorderRightColor) : box.ActualBorderRightColor;
case Border.Bottom:
return style == CssConstants.Outset ? Darken(box.ActualBorderBottomColor) : box.ActualBorderBottomColor;
case Border.Left:
return style == CssConstants.Inset ? Darken(box.ActualBorderLeftColor) : box.ActualBorderLeftColor;
default:
throw new ArgumentOutOfRangeException("border");
}
}
/// <summary>
/// Parses a length. Lengths are followed by an unit identifier (e.g. 10px, 3.1em)
/// </summary>
/// <param name="length">Specified length</param>
/// <param name="hundredPercent">Equivalent to 100 percent when length is percentage</param>
/// <param name="box"></param>
/// <param name="defaultUnit"></param>
/// <returns>the parsed length value with adjustments</returns>
public static float ParseLength(string length, float hundredPercent, CssBoxProperties box, string defaultUnit)
{
return ParseLength(length, hundredPercent, box.GetEmHeight(), defaultUnit, false, false);
}
/// <summary>
/// Gets the result of collapsing the vertical margins of the two boxes
/// </summary>
/// <param name="prevSibling">the previous box under the same parent</param>
/// <returns>Resulting top margin</returns>
private float MarginTopCollapse(CssBoxProperties prevSibling)
{
float value;
if (prevSibling != null )
{
value = Math.Max(prevSibling.ActualMarginBottom, ActualMarginTop);
CollapsedMarginTop = value;
}
else if (_parentBox != null && ActualPaddingTop < 0.1 && ActualPaddingBottom < 0.1 && _parentBox.ActualPaddingTop < 0.1 && _parentBox.ActualPaddingBottom < 0.1)
{
value = Math.Max(0, ActualMarginTop - Math.Max(_parentBox.ActualMarginTop, _parentBox.CollapsedMarginTop));
}
else
{
value = ActualMarginTop;
}
// fix for hr tag
if (value < 0.1 && HtmlTag != null && HtmlTag.Name == "hr")
{
value = GetEmHeight() * 1.1f;
}
return value;
}