public static float CSSUnitStringToPixelSize(CSSUnitStringDelegate cssUnitStringDelegate, IHTMLElement element, LastChanceDelegate lastChanceDelegate, bool vertical)
{
return PointSizeToPixels(CSSUnitStringToPointSize(cssUnitStringDelegate, element, lastChanceDelegate, vertical), vertical);
}
public static float CSSUnitStringToPointSize(CSSUnitStringDelegate cssUnitStringDelegate, IHTMLElement element, LastChanceDelegate lastChanceDelegate, bool vertical)
{
if (element == null && lastChanceDelegate == LastChanceFontPointSize)
{
const string FONT_SIZE_INITIAL_VALUE = "MEDIUM";
return LastChanceFontPointSize(FONT_SIZE_INITIAL_VALUE, element, vertical);
}
string cssUnits = cssUnitStringDelegate(element);
if (String.IsNullOrEmpty(cssUnits) ||
cssUnits == "auto")
return 0;
int result = 0;
try
{
// @RIBBON TODO: Do we need to remove spaces also?
cssUnits.Trim();
cssUnits = cssUnits.ToUpperInvariant();
// PERCENTAGE
int i = cssUnits.IndexOf("%", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
float percentageOfParent = (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture);
if (percentageOfParent == 0.0f)
{
// Shortcut if we're given 0%.
return 0;
}
// In the case of percentages, each CSS property defines what the percentage refers to. There are
// more cases than just the following (see the Percentages column at http://www.w3.org/TR/CSS21/propidx.html
// for a full list) so if percentages are not working correctly you may need to add additional cases.
// Right now, this should be the only case that we hit.
if (cssUnitStringDelegate == CSSUnitStringLineHeight)
{
// The percentage for line-height refers to the font size of the element itself.
return percentageOfParent * CSSUnitStringToPointSize(CSSUnitStringFontSize, element, LastChanceFontPointSize, vertical) / 100;
}
return percentageOfParent * CSSUnitStringToPointSize(cssUnitStringDelegate, element.parentElement, lastChanceDelegate, vertical) / 100;
}
i = cssUnits.IndexOf("PT", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
return (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture);
}
i = cssUnits.IndexOf("PC", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
// 1 pc is 12 pt.
return (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture) * 12;
}
i = cssUnits.IndexOf("IN", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
// 1 inch is 72 pt.
return (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture) * 72;
}
i = cssUnits.IndexOf("CM", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
// 2.54 cm is 72pt --> 1 cm is 28.3464567pt.
return (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture) * 28.3464567f;
}
i = cssUnits.IndexOf("MM", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
// 1 mm is 0.283464567pt.
return (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture) * 0.283464567f;
}
// RELATIVE SIZE
i = cssUnits.IndexOf("EM", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
float parentMultiplier = (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture);
if (cssUnitStringDelegate == CSSUnitStringFontSize)
{
// When 'em' occurs in the value of font-size itself, it refers to the font size of the parent element.
return parentMultiplier * CSSUnitStringToPointSize(cssUnitStringDelegate, element.parentElement, LastChanceFontPointSize, vertical);
}
// Otherwise, the 'em' unit is relative to the computed value of the font-size attribute of the current element.
return parentMultiplier * CSSUnitStringToPointSize(CSSUnitStringFontSize, element, LastChanceFontPointSize, vertical);
}
i = cssUnits.IndexOf("PX", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
float pixels = (float)Convert.ToDouble(cssUnits.Substring(0, i), CultureInfo.InvariantCulture);
return 72 * pixels / (vertical ? DisplayHelper.PixelsPerLogicalInchY : DisplayHelper.PixelsPerLogicalInchX);
}
i = cssUnits.IndexOf("EX", StringComparison.OrdinalIgnoreCase);
if (i > 0)
{
//Debug.Assert(false, "IMPLEMENT EX");
return 0;
}
double number;
if (Double.TryParse(cssUnits, NumberStyles.Float, CultureInfo.InvariantCulture, out number))
{
// The line-height property supports numbers with no units.
if (cssUnitStringDelegate == CSSUnitStringLineHeight)
{
// The percentage for line-height refers to the font size of the element itself.
return ((float)number) * CSSUnitStringToPointSize(CSSUnitStringFontSize, element, lastChanceDelegate, vertical);
}
}
// Opportunity for property specific handling
if (lastChanceDelegate != null)
return lastChanceDelegate(cssUnits, element, vertical);
}
catch (Exception ex)
{
Trace.Fail("Failed to convert CSS units: " + ex);
}
return result;
}
