/// <summary>
/// Creates a new style value expression for the style key with the expression and an optional convertor and base value
/// </summary>
/// <param name="key">The style key this expression is assigned for</param>
/// <param name="expressionString">The exppresion to be evaluated at runtime</param>
/// <param name="convertor">An otpional convertor to make the result the required type</param>
/// <param name="baseValue">An optional base value that will be returned before the expression is bound</param>
public StyleValueExpression(PDFStyleKey <T> key, string expressionString, StyleValueConvertor <T> convertor, T baseValue)
: base(key, baseValue)
{
this._expressionString = expressionString ?? throw new ArgumentNullException(nameof(expressionString));
this._convertor = convertor;
this._variableProvider = null;
this._expression = null;
}
protected bool AttachExpressionBindingHandler <AttrT>(Style style, PDFStyleKey <AttrT> key, string value, StyleValueConvertor <AttrT> convert)
{
StyleValueExpression <AttrT> expression = new StyleValueExpression <AttrT>(key, value, convert);
style.DataBinding += expression.BindValue;
if (style.IsValueDefined(key))
{
style.RemoveValue(key);
}
style.AddValue(expression);
return(true);
}
//
// .ctor
//
#region public StyleValueExpression(PDFStyleKey<T> key, string expressionString, StyleValueConvertor<T> convertor)
/// <summary>
/// Creates a new style value expression for the style key with the expression and an optional convertor
/// </summary>
/// <param name="key">The style key this expression is assigned for</param>
/// <param name="expressionString">The exppresion to be evaluated at runtime</param>
/// <param name="convertor">An otpional convertor to make the result the required type</param>
public StyleValueExpression(PDFStyleKey <T> key, string expressionString, StyleValueConvertor <T> convertor)
: this(key, expressionString, convertor, default)
{
}
