/// <summary>
/// <see cref="T:Xamarin.Forms.Platform.iOS.PageRenderer"/> override that is called whenever the associated
/// <see cref="T:Xamarin.Forms.ContentPage"/> instance changes
/// </summary>
/// <param name="e"><see cref="T:Xamarin.Forms.Platform.iOS.VisualElementChangedEventArgs"/> that specifies the
/// previously and newly assigned <see cref="T:Xamarin.Forms.ContentPage"/> instances
/// </param>
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
e.OldElement.PropertyChanging -= OnElementPropertyChanging;
e.OldElement.PropertyChanged -= OnElementPropertyChanged;
Gradient bkgrndGradient = ContentPageGloss.GetBackgroundGradient(e.OldElement);
if (bkgrndGradient != null)
{
bkgrndGradient.DetachRenderer(this);
}
}
if (e.NewElement != null)
{
e.NewElement.PropertyChanging += OnElementPropertyChanging;
e.NewElement.PropertyChanged += OnElementPropertyChanged;
Gradient bkgrndGradient = ContentPageGloss.GetBackgroundGradient(Element);
if (bkgrndGradient != null)
{
bkgrndGradient.AttachRenderer(ContentPageGloss.BackgroundGradientProperty.PropertyName,
this);
}
}
}
/// <summary>
/// <see cref="T:Xamarin.Forms.Platform.Android.PageRenderer"/> override that is called whenever the
/// <see cref="T:Xamarin.Forms.ContentPage.PropertyChanged"/> event is fired
/// </summary>
/// <param name="sender">Sender.</param>
/// <param name="e">E.</param>
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == ContentPageGloss.BackgroundGradientProperty.PropertyName)
{
Gradient bkgrndGradient = ContentPageGloss.GetBackgroundGradient(Element);
if (bkgrndGradient != null)
{
bkgrndGradient.AttachRenderer(ContentPageGloss.BackgroundGradientProperty.PropertyName, this);
}
}
}