/// <summary>
/// Sets the source binding and updates status.
/// </summary>
protected virtual void SetSource(bool propertyValueChanged)
{
var old = Source;
var binding = GetBindingExpression(PropertyProperty);
if (!ReferenceEquals(_oldBinding, binding) || !ReferenceEquals(_oldDataContext, this.DataContext) || !propertyValueChanged)
{
_oldDataContext = this.DataContext;
_oldBinding = binding;
if (binding != null)
{
if (binding.ParentBinding != null && binding.ParentBinding.Path != null)
{
BindingPath = binding.ParentBinding.Path.Path;
}
else
{
BindingPath = string.Empty;
}
Source = GetRealSource(binding.DataItem, BindingPath);
if (BindingPath.IndexOf('.') > 0)
{
BindingPath = BindingPath.Substring(BindingPath.LastIndexOf('.') + 1);
}
}
else
{
Source = null;
BindingPath = string.Empty;
}
HandleSourceEvents(old, Source);
UpdateState();
}
}
public static System.Windows.Data.Binding GetForegroundBinding(this FrameworkElement element)
{
System.Windows.Data.BindingExpression expr = element.GetBindingExpression(GetForegroundProperty(element));
if (expr == null)
{
return(null);
}
return(expr.ParentBinding);
}
private void CommitTextBoxWithFocus()
{
if (_textboxWithFocus == null)
{
return;
}
System.Windows.Data.BindingExpression expression =
_textboxWithFocus.GetBindingExpression(TextBox.TextProperty);
if (expression != null)
{
expression.UpdateSource();
}
}
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
if (value is null)
{
return(new ValidationResult(false, "This field must be filled in."));
}
if (value is System.Windows.Data.BindingExpression)
{
System.Windows.Data.BindingExpression binding = value as System.Windows.Data.BindingExpression;
object dataItem = binding.DataItem;
string propertyName = binding.ParentBinding.Path.Path;
object propertyValue = dataItem.GetType().GetProperty(propertyName).GetValue(dataItem, null);
value = propertyValue;
}
return(string.IsNullOrWhiteSpace((value ?? "").ToString())
? new ValidationResult(false, "This field must be filled in.")
: ValidationResult.ValidResult);
}
protected override void OnTextChanged(TextChangedEventArgs e)
{
// if the timer elapsed or text was changed by something besides a keystroke
// fire base.OnTextChanged
if (TimerElapsed || !KeysPressed)
{
TimerElapsed = false;
KeysPressed = false;
base.OnTextChanged(e);
System.Windows.Data.BindingExpression be = GetBindingExpression(TextProperty);
if (be != null && be.Status == System.Windows.Data.BindingStatus.Active)
{
be.UpdateSource();
}
PreviousTextValue = Text;
}
_previousTextChangedEventArgs = e;
}
