private void EditableTextBoxValidating(object sender, CancelRoutedEventArgs e)
{
// This may happens somehow when the template is refreshed.
if (!ReferenceEquals(sender, editableTextBox))
return;
validating = true;
UpdateText();
validating = false;
var cancelRoutedEventArgs = new CancelRoutedEventArgs(ValidatingEvent);
RaiseEvent(cancelRoutedEventArgs);
if (cancelRoutedEventArgs.Cancel)
e.Cancel = true;
}
/// <summary>
/// Raised when the text of the TextBox is being validated.
/// </summary>
/// <param name="e">The event argument.</param>
protected virtual void OnValidating(CancelRoutedEventArgs e)
{
}
private void EditableTextBoxValidating(object sender, CancelRoutedEventArgs e)
{
// This may happens somehow when the template is refreshed.
if (!ReferenceEquals(sender, editableTextBox))
return;
// If we require a selected item but there is none, cancel the validation
BindingExpression expression;
if (RequireSelectedItemToValidate && SelectedItem == null)
{
e.Cancel = true;
expression = GetBindingExpression(TextProperty);
expression?.UpdateTarget();
editableTextBox.Cancel();
return;
}
validating = true;
// Update the validated properties
ValidatedValue = SelectedValue;
ValidatedItem = SelectedItem;
// If the dropdown is still open and something is selected, use the string from the selected item
if (SelectedItem != null && IsDropDownOpen)
{
var displayValue = ResolveDisplayMemberValue(SelectedItem);
editableTextBox.Text = displayValue?.ToString();
if (editableTextBox.Text != null)
editableTextBox.CaretIndex = editableTextBox.Text.Length;
}
// Update the source of the text property binding
expression = GetBindingExpression(TextProperty);
expression?.UpdateSource();
// Close the dropdown
if (IsDropDownOpen)
IsDropDownOpen = false;
validating = false;
var cancelRoutedEventArgs = new CancelRoutedEventArgs(ValidatingEvent);
RaiseEvent(cancelRoutedEventArgs);
if (cancelRoutedEventArgs.Cancel)
e.Cancel = true;
}
/// <summary>
/// Validates the current changes in the TextBox.
/// </summary>
public void Validate()
{
var cancelRoutedEventArgs = new CancelRoutedEventArgs(ValidatingEvent);
OnValidating(cancelRoutedEventArgs);
if (cancelRoutedEventArgs.Cancel)
return;
RaiseEvent(cancelRoutedEventArgs);
if (cancelRoutedEventArgs.Cancel)
return;
validating = true;
var coercedText = CoerceTextForValidation(Text);
SetCurrentValue(TextProperty, coercedText);
BindingExpression expression = GetBindingExpression(TextProperty);
if (expression != null)
expression.UpdateSource();
ClearUndoStack();
var validatedArgs = new ValidationRoutedEventArgs<string>(ValidatedEvent, coercedText);
OnValidated();
RaiseEvent(validatedArgs);
if (ValidateCommand != null && ValidateCommand.CanExecute(ValidateCommandParameter))
ValidateCommand.Execute(ValidateCommandParameter);
validating = false;
}
private void EditableTextBoxValidating(object sender, CancelRoutedEventArgs e)
{
// This may happens somehow when the template is refreshed.
if (!ReferenceEquals(sender, editableTextBox))
return;
validating = true;
// In case we don't need real validation, let's use current textbox value
if (!NeedsMatchingItem && listBox.SelectedItem == null)
SelectedValue = editableTextBox.Text;
UpdateText();
validating = false;
var cancelRoutedEventArgs = new CancelRoutedEventArgs(ValidatingEvent);
RaiseEvent(cancelRoutedEventArgs);
if (cancelRoutedEventArgs.Cancel)
e.Cancel = true;
}
