/// <summary>
/// Implementation of method required by the <see cref="T:XFGloss.IXFGlossRenderer"/> interface that the
/// <see cref="T:XFGloss.IGradientRenderer"/> interface extends. Applies the passed
/// <see cref="T:XFGloss.XFGlossElement"/> properties to the iOS UIView.
/// </summary>
/// <param name="propertyName">The name of the XFGloss attached BindableProperty that changed</param>
/// <param name="element">The <see cref="T:XFGloss.XFGlossElement"/> instance that changed</param>
/// <typeparam name="TElement">The type <see cref="T:XFGloss.XFGlossElement"/> that changed</typeparam>
public void CreateNativeElement <TElement>(string propertyName, TElement element) where TElement : XFGlossElement
{
if (element is Gradient)
{
// No need to check property name yet, BackgroundGradient is the only one being handled here.
XFGlossGradientLayer.CreateGradientLayer(NativeView, element as Gradient);
}
}
/// <summary>
/// Override of the UIViewController method to update the background gradient layer size whenever view layout
/// changes occur.
/// </summary>
public override void ViewDidLayoutSubviews()
{
if (NativeView != null)
{
var layer = XFGlossGradientLayer.GetGradientLayer(NativeView);
if (layer != null)
{
layer.Frame = new CGRect(CGPoint.Empty, NativeView.Frame.Size);
}
}
base.ViewDidLayoutSubviews();
}
/// <summary>
/// Implementation of method required by the <see cref="T:XFGloss.IGradientRenderer"/> interface. Updates
/// the rotation angle being used by any existing implementation of the property specified by the propertyName
/// parameter.
/// </summary>
/// <param name="propertyName">The name of the XFGloss attached BindableProperty that changed</param>
/// <param name="rotation">The new rotation value, an integer number between 0 and 359</param>
public void UpdateRotation(string propertyName, int rotation)
{
// No need to check property name yet, BackgroundGradient is the only one being handled here.
XFGlossGradientLayer.GetGradientLayer(NativeView)?.UpdateRotation(rotation);
}
/// <summary>
/// Implementation of method required by the <see cref="T:XFGloss.IXFGlossRenderer"/> interface that the
/// <see cref="T:XFGloss.IGradientRenderer"/> interface extends. Removes any existing implementation of
/// the property specified by the propertyName parameter.
/// </summary>
/// <param name="propertyName">The name of the XFGloss attached BindableProperty that changed</param>
public void RemoveNativeElement(string propertyName)
{
// No need to check property name yet, BackgroundGradient is the only one being handled here.
XFGlossGradientLayer.RemoveGradientLayer(NativeView);
}
/// <summary>
/// Implementation of method required by the <see cref="T:XFGloss.IXFGlossRenderer"/> interface that the
/// <see cref="T:XFGloss.IGradientRenderer"/> interface extends. Indicates if there is an existing
/// implementation of the property specified by the propertyName parameter.
/// </summary>
/// <returns><c>true</c>, if an existing implementation is found, <c>false</c> otherwise.</returns>
/// <param name="propertyName">The name of the XFGloss attached BindableProperty that changed</param>
public bool CanUpdate(string propertyName)
{
// No need to check property name yet, BackgroundGradient is the only one being handled here.
return(XFGlossGradientLayer.GetGradientLayer(NativeView) != null);
}
/// <summary>
/// Implementation of method required by the <see cref="T:XFGloss.IGradientRenderer"/> interface. Updates
/// the gradient fill steps being used by any existing implementation of the property specified by the
/// propertyName parameter.
/// </summary>
/// <param name="propertyName">The name of the XFGloss attached BindableProperty that changed</param>
/// <param name="steps">The new collection of <see cref="T:XFGloss.GradientStep"/> instances that specify the
/// colors and positions of each step of the gradient fill</param>
public void UpdateSteps(string propertyName, GradientStepCollection steps)
{
// No need to check property name yet, BackgroundGradient is the only one being handled here.
XFGlossGradientLayer.GetGradientLayer(NativeView)?.UpdateSteps(steps);
}
