public static void SetValue <T>(this State state, ref T currentValue, T newValue, View view, [CallerMemberName] string propertyName = "")
{
if (state?.IsBuilding ?? false)
{
var props = state.EndProperty();
var propCount = props.Length;
//This is databound!
if (propCount > 0)
{
bool isGlobal = propCount > 1;
if (propCount == 1)
{
var prop = props[0];
var stateValue = state.GetValue(prop).Cast <T>();
var old = state.EndProperty();
//1 to 1 binding!
if (EqualityComparer <T> .Default.Equals(stateValue, newValue))
{
state.BindingState.AddViewProperty(prop, propertyName, view);
Debug.WriteLine($"Databinding: {propertyName} to {prop}");
}
else
{
var errorMessage = $"Warning: {propertyName} is using formated Text. For performance reasons, please switch to a Lambda. i.e new Text(()=> \"Hello\")";
if (Debugger.IsAttached)
{
throw new Exception(errorMessage);
}
Debug.WriteLine(errorMessage);
isGlobal = true;
}
}
else
{
var errorMessage = $"Warning: {propertyName} is using Multiple state Variables. For performance reasons, please switch to a Lambda.";
if (Debugger.IsAttached)
{
throw new Exception(errorMessage);
}
Debug.WriteLine(errorMessage);
}
if (isGlobal)
{
state.BindingState.AddGlobalProperties(props);
}
}
}
if (EqualityComparer <T> .Default.Equals(currentValue, newValue))
{
return;
}
currentValue = newValue;
view.BindingPropertyChanged(propertyName, newValue);
}