/// <summary>
/// Creates a new gradient layer and inserts it as a subview if a gradient layer doesn't already exist.
/// If one does exist, the existing one is updated.
/// </summary>
/// <param name="view">The native view the gradient fill is being applied to</param>
/// <param name="gradient">The <see cref="T:XFGloss.Gradient"/> instance to copy the fill parameters from</param>
static public void CreateGradientLayer(UIView view, Gradient gradient)
{
// Clear any previously-assigned background color
view.BackgroundColor = UIColor.Clear;
XFGlossGradientLayer gradientLayer = GetGradientLayer(view);
// Create or update the layer as needed if a new gradient was passed to us
bool insertLayer = false;
if (gradientLayer == null)
{
gradientLayer = new XFGlossGradientLayer(view, gradient);
insertLayer = true;
}
else
{
gradientLayer.GradientSource = gradient;
}
// Insert the layer if we created a new one
if (insertLayer)
{
view.Layer.InsertSublayer(gradientLayer, 0);
}
}
/// <summary>
/// Dispose any created resources and prepare the instance for garbage collection
/// </summary>
/// <param name="disposing">If set to <c>true</c>, dispose any created resources</param>
protected override void Dispose(bool disposing)
{
if (disposing)
{
XFGlossGradientLayer.RemoveGradientLayer(this);
}
base.Dispose(disposing);
}
/// <summary>
/// UIView override to update our gradient layer's size to match our view's bounds whenever the bounds are
/// changing
/// </summary>
public override void LayoutSubviews()
{
var layer = XFGlossGradientLayer.GetGradientLayer(this);
if (layer != null)
{
layer.Frame = new CGRect(CGPoint.Empty, Frame.Size);
}
base.LayoutSubviews();
}
/// <summary>
/// Updates the associated <see cref="T:XFGloss.iOS.Views.XFGlossGradientLayer"/> instance's steps collection.
/// </summary>
/// <param name="steps">The steps collection to assign</param>
public void UpdateSteps(GradientStepCollection steps)
{
var layer = XFGlossGradientLayer.GetGradientLayer(this);
layer?.UpdateSteps(steps);
}
/// <summary>
/// Updates the associated <see cref="T:XFGloss.iOS.Views.XFGlossGradientLayer"/> instance's rotation value.
/// </summary>
/// <param name="rotation">An integer number between 0 and 359</param>
public void UpdateRotation(int rotation)
{
var layer = XFGlossGradientLayer.GetGradientLayer(this);
layer?.UpdateRotation(rotation);
}
/// <summary>
/// Initializes a new instance of the <see cref="T:XFGloss.iOS.Views.UIBackgroundGradientView"/> class.
/// </summary>
/// <param name="rect">Rect.</param>
/// <param name="gradientSource">Gradient source.</param>
public UIBackgroundGradientView(CGRect rect, Gradient gradientSource) : base(rect)
{
XFGlossGradientLayer.CreateGradientLayer(this, gradientSource);
}
