protected override void OnElementChanged(ElementChangedEventArgs <Entry> e)
{
base.OnElementChanged(e);
if (e.OldElement != null && _textfield != null)
{
_textfield.EditingChanged -= EditingChanged;
_textfield.OnDeleteBackward -= OnDeleteBackward;
_textfield.EditingDidEnd -= EditingDidEnd;
_textfield.EditingDidBegin -= EditingDidBegin;
_textfield.ShouldChangeCharacters -= ShouldChangeCharacters;
_textfield.Dispose();
_selectedTextRangeObserver?.Dispose();
_textfield = null;
}
if (Control is null || e.NewElement is null)
{
return;
}
_element = (CustomEntry)e.NewElement;
if (_element.BorderColor == Color.Default)
{
return;
}
_textfield = new UIBackwardsTextField();
_textfield.EditingChanged += EditingChanged;
_textfield.OnDeleteBackward += OnDeleteBackward;
_textfield.EditingDidEnd += EditingDidEnd;
_textfield.EditingDidBegin += EditingDidBegin;
_textfield.ShouldReturn = OnShouldReturn;
_textfield.ShouldChangeCharacters += ShouldChangeCharacters;
// When we set the control text, it triggers the UpdateCursorFromControl event, which updates CursorPosition and SelectionLength;
// These one-time-use variables will let us initialize a CursorPosition and SelectionLength via ctor/xaml/etc.
_cursorPositionChangePending = Element.IsSet(Entry.CursorPositionProperty);
_selectionLengthChangePending = Element.IsSet(Entry.SelectionLengthProperty);
SetNativeControl(_textfield);
//Reupdate properties as when set native control all set up is gone
Control.Font = _element.ToUIFont();
Control.ApplyKeyboard(_element.Keyboard);
Control.ReloadInputViews();
Control.TextAlignment = _element.HorizontalTextAlignment.ToNativeTextAlignment(((IVisualElementController)_element).EffectiveFlowDirection);
Control.VerticalAlignment = _element.VerticalTextAlignment.ToNativeTextAlignment();
Control.TextColor = _element.TextColor.ToUIColor();
SetupBorder();
var formatted = (FormattedString)Element.Placeholder;
if (formatted != null)
{
var targetColor = Element.PlaceholderColor;
var color = targetColor.IsDefault ? _defaultPlaceholderColor : targetColor;
UpdateAttributedPlaceholder(formatted.ToAttributed(Element, color));
UpdateAttributedPlaceholder(Control.AttributedPlaceholder.AddCharacterSpacing(Element.Placeholder, Element.CharacterSpacing));
}
}