private static void OnTextFocus(object sender, RoutedEventArgs e)
{
WatermarkTextBox txtBox = sender as WatermarkTextBox;
TextBlock watermarkTextBlock = txtBox.Template.FindName("Watermark", txtBox) as TextBlock;
if (txtBox.IsFocused)
{
txtBox.RaiseEvent(new RoutedEventArgs(TextFocusOnEvent));
}
else
{
txtBox.RaiseEvent(new RoutedEventArgs(TextLostFocusOnEvent));
}
if (watermarkTextBlock != null)
{
if (e.RoutedEvent.Name == "GotFocus")
{
if (txtBox.Text.Length == 0)
{
watermarkTextBlock.Visibility = Visibility.Hidden;
}
}
else if (e.RoutedEvent.Name == "LostFocus")
{
if (txtBox.Text.Length == 0)
{
watermarkTextBlock.Visibility = Visibility.Visible;
}
}
}
}
private static void OnWatermarkChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
WatermarkTextBox txtBox = sender as WatermarkTextBox;
if (txtBox != null)
{
txtBox.GotFocus -= OnTextFocus;
txtBox.GotFocus += OnTextFocus;
txtBox.LostFocus -= OnTextFocus;
txtBox.LostFocus += OnTextFocus;
txtBox.TextChanged -= OnTextBoxChanged;
txtBox.TextChanged += OnTextBoxChanged;
return;
}
PasswordBox pwdBox = sender as PasswordBox;
if (pwdBox != null)
{
pwdBox.PasswordChanged -= OnPasswordChanged;
pwdBox.PasswordChanged += OnPasswordChanged;
pwdBox.GotFocus -= OnPasswordFocus;
pwdBox.GotFocus += OnPasswordFocus;
pwdBox.LostFocus -= OnPasswordFocus;
pwdBox.LostFocus += OnPasswordFocus;
return;
}
}
private static void OnTextBoxChanged(object sender, RoutedEventArgs e)
{
try
{
WatermarkTextBox txtBox = sender as WatermarkTextBox;
TextBlock watermarkTextBlock = txtBox.Template.FindName("Watermark", txtBox) as TextBlock;
if (watermarkTextBlock != null)
{
watermarkTextBlock.Visibility = txtBox.Text.Length == 0
? Visibility.Visible : Visibility.Hidden;
}
}
catch (Exception)
{
}
}
