public static T GetValue <T>(this IStyle style, IStyleKey <T> key, T defaultValue = default(T))
{
T val;
if (style.GetValue(key, out val))
{
return(val);
}
return(defaultValue);
}
public bool GetValue <T>(IStyleKey key, out T value)
{
if (elementStyle.GetValue(key, out value))
{
return(true);
}
if (!elementStyle.IsExplicitlyInherited(key))
{
if (ResolvedStyles.GetValue(key, out value))
{
return(true);
}
if (!ResolvedStyles.IsExplicitlyInherited(key) && !key.Inherit)
{
value = default(T);
return(false);
}
}
// inheritance is potentially expensive, as we may traverse multiple
// layers to get to the bottom of the tree. Caching is mandatory.
object cachedValue;
if (TryGetValue(key, out cachedValue))
{
value = (T)cachedValue;
return(true);
}
var parentStyle = Self.GetStyleParent()?.Style;
if (parentStyle != null)
{
if (parentStyle.GetValue(key, out value))
{
Store(key, value);
return(true);
}
}
value = default(T);
Store(key, value);
return(false);
}