private bool isPropertyExists(CSSDeclaration declaration)
{
string propertyname = declaration.propertyname.ToLower();
foreach (var onedeclaration in item)
{
if (onedeclaration.propertyname.ToLower() == propertyname)
{
return(true);
}
}
return(false);
}
private void updateCssText(CSSDeclaration declaration)
{
string declarationText = declaration.propertyname + ": " + declaration.value;
if (declaration.important)
{
declarationText = declarationText + " !important";
}
declarationText = declarationText + ";";
// use regex is OK in this case, because all property name does not contains escape chars.
string pattern = declaration.propertyname + @"\s*\:\s*.*?(;|$)";
_cssText = Regex.Replace(_cssText, pattern, declarationText);
}
/// <summary>
/// add the new declaration to csstext.
/// </summary>
/// <param name="declaration"></param>
private void appendCssText(CSSDeclaration declaration)
{
/// this append actually insert at the beginning to prevent,
////// To serialize a CSS declaration with property name property, value and optionally an important flag set, follow these steps:
//Let s be the empty string.
//Append property to s.
//Append ": " (U+003A U+0020) to s.
//Append value to s.
//If the important flag is set, append " !important" (U+0020 U+0021 U+0069 U+006D U+0070 U+006F U+0072 U+0074 U+0061 U+006E U+0074) to s.
//Append ";" (U+003B) to s.
//Return s.
string declarationText = declaration.propertyname + ": " + declaration.value;
if (declaration.important)
{
declarationText = declarationText + " !important";
}
declarationText = "\r\n" + declarationText + ";" + "\r\n";
if (string.IsNullOrEmpty(_cssText))
{
initializeCssText();
}
if (string.IsNullOrEmpty(_cssText))
{
_cssText = declarationText;
return;
}
int bracketIndex = _cssText.IndexOf("{");
if (bracketIndex > 0)
{
string firststring = _cssText.Substring(0, bracketIndex + 1);
string secondstring = _cssText.Substring(bracketIndex + 1);
_cssText = firststring + declarationText + secondstring;
}
else
{
_cssText = declarationText + _cssText;
}
}
//below methods are created to update _cssText when a property is set or changed.
/// <summary>
/// Insert or update declaration, will also update the cssText.
/// </summary>
/// <param name="declaration"></param>
public void updateDeclaration(CSSDeclaration declaration)
{
if (declaration == null)
{
return;
}
bool exists = isPropertyExists(declaration);
setProperty(declaration.propertyname, declaration.value, declaration.important);
if (exists)
{
updateCssText(declaration);
}
else
{
appendCssText(declaration);
}
}
