/// <summary>
/// Simple method to add a new TextBlock into the visual tree of the PasswordBox which will present the watermark.
/// </summary>
/// <param name="pbox">The target PasswordBox.</param>
/// <param name="text">The watermark text.</param>
private static void AddWatermarkElement(PasswordBox pbox, string text)
{
var watermarkTextBlock = pbox.FindVisualChildByName<TextBlock>(pbox.Name+pbox.Name+WatermarkId);
if (watermarkTextBlock == null)
{
var fe = pbox.FindVisualChildByName<ScrollViewer>("ContentElement");
if (fe != null)
{
var panelOwner = fe.FindVisualParent<Panel>();
if (panelOwner != null)
{
// Add the TextBlock
var textBlock = new TextBlock
{
Name = pbox.Name + WatermarkId,
Text = text,
TextAlignment = TextAlignment.Center,
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center,
Margin = new Thickness(3, 0, 0, 0),
Foreground = new SolidColorBrush(Colors.Gray)
};
int index = panelOwner.Children.IndexOf(fe);
panelOwner.Children.Insert(index + 1, textBlock);
}
}
}
}
/// <summary>
/// Simple method to remove the TextBlock from the PasswordBox visual tree.
/// </summary>
/// <param name="pbox">The target PasswordBox.</param>
private static void RemoveWatermarkElement(PasswordBox pbox)
{
var watermarkTextBlock = pbox.FindVisualChildByName<TextBlock>(pbox.Name + WatermarkId);
if (watermarkTextBlock != null)
{
var panelOwner = watermarkTextBlock.FindVisualParent<Panel>();
if (panelOwner != null)
{
panelOwner.Children.Remove(watermarkTextBlock);
}
}
}
