/// <summary>
/// Changes the HideOnFocus property of the text box in the visual tree of the sender.
/// </summary>
/// <param name="sender">The object where the event handler is attached.</param>
/// <param name="e">Provides data about the event.</param>
private static void ChangeHideOnFocus(object sender, RoutedEventArgs e)
{
var adornedElement = sender as Control;
if (adornedElement == null)
{
return;
}
var templateTextBox = FindTextBox(adornedElement);
if (templateTextBox != null)
{
PlaceholderAdorner.SetHideOnFocus(templateTextBox, PlaceholderAdorner.GetHideOnFocus(adornedElement));
}
}
/// <summary>
/// Invoked whenever <see cref="T:T:ReactNative.Views.TextInput.PlaceholderAdorner" />.HideOnFocus attached property is changed.
/// </summary>
/// <param name="sender">
/// The object where the event handler is attached.
/// </param>
/// <param name="e">
/// Provides data about the event.
/// </param>
private static void OnHideOnFocusChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
bool hideOnFocus = (bool)e.NewValue;
if ((bool)e.OldValue == hideOnFocus)
{
return;
}
var adornedElement = sender as Control;
if (!(adornedElement is TextBox || adornedElement is PasswordBox || adornedElement is RichTextBox))
{
if (!adornedElement.IsLoaded)
{
adornedElement.Loaded += ChangeHideOnFocus;
}
else
{
var templateTextBox = FindTextBox(adornedElement);
if (templateTextBox != null)
{
PlaceholderAdorner.SetHideOnFocus(templateTextBox, (bool)e.NewValue);
}
}
return;
}
PlaceholderAdorner placeholder = null;
var adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement);
if (adornerLayer == null)
{
return;
}
var adorners = adornerLayer.GetAdorners(adornedElement);
if (adorners != null)
{
foreach (Adorner adorner in adorners)
{
placeholder = adorner as PlaceholderAdorner;
if (placeholder != null)
{
break;
}
}
}
if (placeholder == null)
{
return;
}
if (adornedElement.IsLoaded)
{
if (hideOnFocus)
{
adornedElement.GotFocus += placeholder.AdornedElement_GotFocus;
adornedElement.LostFocus += placeholder.AdornedElement_LostFocus;
if (adornedElement.IsFocused && placeholder._isPlaceholderVisible)
{
placeholder.InvalidateVisual();
}
}
else
{
adornedElement.GotFocus -= placeholder.AdornedElement_GotFocus;
adornedElement.LostFocus -= placeholder.AdornedElement_LostFocus;
placeholder.AdornedElement_LostFocus(adornedElement,
new RoutedEventArgs(UIElement.LostFocusEvent, placeholder));
}
}
else
{
adornedElement.Loaded += AdornedElement_Loaded;
}
}
