public override ICssValue GetPropertyCssValue(string propertyName)
{
if (_collectedStyles.ContainsKey(propertyName))
{
CssCollectedProperty scp = _collectedStyles[propertyName];
if (scp.CssValue.CssValueType == CssValueType.Inherit)
{
// get style from parent chain
return(getParentStyle(propertyName));
}
return(scp.CssValue.GetAbsoluteValue(propertyName, _element));
}
// should this property inherit?
CssXmlDocument doc = (CssXmlDocument)_element.OwnerDocument;
if (doc.CssPropertyProfile.IsInheritable(propertyName))
{
ICssValue parValue = getParentStyle(propertyName);
if (parValue != null)
{
return(parValue);
}
}
string initValue = doc.CssPropertyProfile.GetInitialValue(propertyName);
if (initValue == null)
{
return(null);
}
return(CssValue.GetCssValue(initValue, false).GetAbsoluteValue(propertyName, _element));
}
/// <summary>
/// Returns the origin type of the collected property
/// </summary>
/// <param name="propertyName">The name of the property</param>
/// <returns>The origin type</returns>
public CssStyleSheetType GetPropertyOrigin(string propertyName)
{
if (_collectedStyles.ContainsKey(propertyName))
{
CssCollectedProperty scp = _collectedStyles[propertyName];
return(scp.Origin);
}
return(CssStyleSheetType.Unknown);
}
public void CollectProperty(string name, int specificity, CssValue cssValue, CssStyleSheetType origin, string priority)
{
CssCollectedProperty newProp = new CssCollectedProperty(name, specificity, cssValue, origin, priority);
if (!collectedStyles.ContainsKey(name))
{
collectedStyles[name] = newProp;
}
else
{
CssCollectedProperty existingProp = collectedStyles[name];
if (newProp.IsBetterThen(existingProp))
{
collectedStyles[name] = newProp;
}
}
}
internal bool IsBetterThen(CssCollectedProperty existing)
{
bool yes = false;
#region sorting according to the rules at http: //www.w3.org/TR/CSS21/cascade.html#cascading-order
bool gotHigherSpecificity = (Specificity >= existing.Specificity);
switch (existing.Origin)
{
case CssStyleSheetType.UserAgent:
yes = (Origin == CssStyleSheetType.UserAgent) ? gotHigherSpecificity : true;
break;
case CssStyleSheetType.NonCssPresentationalHints:
yes = (Origin != CssStyleSheetType.UserAgent);
break;
case CssStyleSheetType.Inline:
yes = (Origin != CssStyleSheetType.UserAgent &&
Origin != CssStyleSheetType.NonCssPresentationalHints);
break;
case CssStyleSheetType.Author:
if (Origin == CssStyleSheetType.Author &&
Priority == existing.Priority &&
gotHigherSpecificity)
{
// author rules of the same priority
yes = true;
}
else if (Origin == CssStyleSheetType.Inline)
{
// inline rules override author rules
yes = true;
}
else if (Origin == CssStyleSheetType.User && Priority == "important")
{
// !important user rules overrides author rules
yes = true;
}
else if (Origin == CssStyleSheetType.Author &&
existing.Priority != "important" &&
Priority == "important"
)
{
// !important author rules override non-!important author rules
yes = true;
}
break;
case CssStyleSheetType.User:
if (Origin == CssStyleSheetType.User &&
existing.Priority == Priority &&
gotHigherSpecificity)
{
yes = true;
}
else if ((Origin == CssStyleSheetType.Author || Origin == CssStyleSheetType.Inline) &&
existing.Priority != "important")
{
// author rules overrides not !important user rules
yes = true;
}
else if (Origin == CssStyleSheetType.User &&
Priority == "important")
{
// !important user rules override non-!important user rules
yes = true;
}
break;
}
#endregion
return(yes);
}
internal bool IsBetterThen(CssCollectedProperty existing)
{
bool yes = false;
#region sorting according to the rules at http://www.w3.org/TR/CSS21/cascade.html#cascading-order
bool gotHigherSpecificity = (Specificity>=existing.Specificity);
switch(existing.Origin)
{
case CssStyleSheetType.UserAgent:
yes = (Origin == CssStyleSheetType.UserAgent) ? gotHigherSpecificity : true;
break;
case CssStyleSheetType.NonCssPresentationalHints:
yes = (Origin != CssStyleSheetType.UserAgent);
break;
case CssStyleSheetType.Inline:
yes = (Origin != CssStyleSheetType.UserAgent &&
Origin != CssStyleSheetType.NonCssPresentationalHints);
break;
case CssStyleSheetType.Author:
if(Origin == CssStyleSheetType.Author &&
Priority == existing.Priority &&
gotHigherSpecificity)
{
// author rules of the same priority
yes = true;
}
else if(Origin == CssStyleSheetType.Inline)
{
// inline rules override author rules
yes = true;
}
else if(Origin == CssStyleSheetType.User && Priority == "important")
{
// !important user rules overrides author rules
yes = true;
}
else if(Origin == CssStyleSheetType.Author &&
existing.Priority != "important" &&
Priority == "important"
)
{
// !important author rules override non-!important author rules
yes = true;
}
break;
case CssStyleSheetType.User:
if(Origin == CssStyleSheetType.User &&
existing.Priority == Priority &&
gotHigherSpecificity)
{
yes = true;
}
else if((Origin == CssStyleSheetType.Author || Origin == CssStyleSheetType.Inline) &&
existing.Priority != "important")
{
// author rules overrides not !important user rules
yes = true;
}
else if(Origin == CssStyleSheetType.User &&
Priority == "important")
{
// !important user rules override non-!important user rules
yes = true;
}
break;
}
#endregion
return yes;
}
public void CollectProperty(string name, int specificity, CssValue cssValue, CssStyleSheetType origin, string priority)
{
CssCollectedProperty newProp = new CssCollectedProperty(name, specificity, cssValue, origin, priority);
if (!collectedStyles.ContainsKey(name))
{
collectedStyles[name] = newProp;
}
else
{
CssCollectedProperty existingProp = collectedStyles[name];
if (newProp.IsBetterThen(existingProp))
{
collectedStyles[name] = newProp;
}
}
}