/// <summary>
/// Method checks if pasted string contains input that is invalid and cancels
/// past command if string is not conforming to regular expression.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void OnPaste(object sender, DataObjectPastingEventArgs e)
{
if (e.DataObject.GetDataPresent(DataFormats.Text))
{
var RegularExpression = AllowableCharactersTextBoxBehavior.GetRegularExpressionProperty(sender as TextBox);
string text = System.Convert.ToString(e.DataObject.GetData(DataFormats.Text));
if (!IsValid(text, true, RegularExpression))
{
e.CancelCommand();
}
}
else
{
e.CancelCommand();
}
}
/// <summary>
/// Previews a text change and cancels the change if text appears to be invalid.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void uiElement_PreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
{
var RegularExpression = AllowableCharactersTextBoxBehavior.GetRegularExpressionProperty(sender as TextBox);
e.Handled = !IsValid(e.Text, false, RegularExpression);
}
