void OnSideChanged(PropertyPathBinding leftPropertyBinding, PropertyPathBinding rightPropertyBinding)
{
var result = leftPropertyBinding.TryGetValue(out var evaluatedValue);
if (result == true)
{
rightPropertyBinding.TrySetValue(evaluatedValue);
}
}
void Subscribe(PropertyPathBinding expr, PropertyPathBinding dependentExpr)
{
Action action = null;
action = () =>
{
OnSideChanged(expr, dependentExpr);
};
expr.Subscribe(action);
}
public override void Unbind()
{
leftBinding.Unsubscribe();
rightBinding.Unsubscribe();
// remove all reference to left and right side to GC can collect them
leftSide = null;
rightSide = null;
leftBinding = null;
rightBinding = null;
base.Unbind();
}
public PropertyBinding(Expression leftSide, Expression rightSide, BindingDirection bindingDirection)
{
ValidateExpression(leftSide);
ValidateExpression(rightSide);
if (((PropertyInfo)((MemberExpression)leftSide).Member).PropertyType != ((PropertyInfo)((MemberExpression)rightSide).Member).PropertyType)
{
throw new ArgumentException("Both properties should be the same type");
}
this.leftSide = leftSide;
this.rightSide = rightSide;
leftBinding = CreateBindingExpression(leftSide);
rightBinding = CreateBindingExpression(rightSide);
if (bindingDirection == BindingDirection.RightToLeft)
{
var result = rightBinding.TryGetValue(out var value);
bool leftSet = false;
if (result == true)
{
leftSet = leftBinding.TrySetValue(value);
}
}
else
{
var result = leftBinding.TryGetValue(out var value);
if (result == true)
{
rightBinding.TrySetValue(value);
}
}
Subscribe(this.leftBinding, this.rightBinding);
Subscribe(this.rightBinding, this.leftBinding);
}