public override void Draw(CGRect rect)
{
base.Draw(rect);
CGGradient gradient = null;
using (CGColorSpace rgb = CGColorSpace.CreateDeviceRGB())
{
gradient = new CGGradient(rgb, new CGColor[]
{
_startColor.ToCGColor(),
_middleColor.ToCGColor(),
_endColor.ToCGColor()
});
}
var start = new CGPoint(0, 0);
var end = new CGPoint(rect.Width, rect.Height);
for (var i = 0; i < Subviews.Length; i++)
{
var child = Subviews[i];
if (child is FrameRenderer_iOS gFrame)
{
gFrame.Gradient = gradient;
gFrame.Start = start;
gFrame.End = end;
}
}
}
public void SetColor(Xamarin.Forms.Color c)
{
var clr = c.ToCGColor();
#if MONOMAC
_c.SetFillColorWithColor(cgcol);
_c.SetStrokeColorWithColor(cgcol);
#else
_c.SetFillColor(clr);
_c.SetStrokeColor(clr);
#endif
}
// this will draw background and circular border then it will cut the image to a circle inside the border and padding
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
// the control as it exists in the protable project
formControl = (SelectImageButton)sender;
// the click events form the forms control to be added to the end of the long click
buttonevents = formControl.ClickEvents;
// setting the colors for use in ther renderer outside of the property changed event
iosBackgroundColor = formControl.BackgroundColor.ToCGColor();
iosBorderColor = formControl.BorderColor.ToCGColor();
iosBorderWidth = formControl.BorderWidth;
iosHoldBackgroundColor = formControl.HoldBackgroundColor.ToCGColor();
iosHoldBorderColor = formControl.HoldBorderColor.ToCGColor();
iosHoldBorderWidth = formControl.HoldBorderWidth;
// background
Xamarin.Forms.Color bgcolor = formControl.BackgroundColor;
Layer.BackgroundColor = bgcolor.ToCGColor();
// border
Layer.BorderColor = formControl.BorderColor.ToCGColor();
Layer.BorderWidth = formControl.BorderWidth;
Layer.CornerRadius = (float)formControl.Width / 2;
// setup for a long press gesture
UILongPressGestureRecognizer holdGesture = new UILongPressGestureRecognizer(holdPress);
holdGesture.MinimumPressDuration = 0.0;
this.AddGestureRecognizer(holdGesture);
// this need to check that the control is actually loaded as it can call this method without the control present
if (formControl != null)
{
// a top left and bottom right adjustment for the clipping border
float TLborderControl = 0;
float BRborderControl = formControl.BorderWidth;
// a rectangle made usiing the bounds and borders of the control that we will use the cut an elipse with
CGRect clipRect = new CGRect();
clipRect.X = (float)0 + TLborderControl;
clipRect.Y = (float)0 + TLborderControl;
clipRect.Width = (float)Element.Bounds.Width;
clipRect.Height = (float)Element.Bounds.Height;
CAShapeLayer clipShapeLayer = new CAShapeLayer();
CGPath clipPath = new CGPath();
clipPath.AddEllipseInRect(clipRect);
clipShapeLayer.Path = clipPath;
Layer.Mask = clipShapeLayer;
}
}
void SetOverlay(Xamarin.Forms.Color color)
{
var formsImage = (Xamarin.Forms.Image)Element;
if (formsImage?.Source == null)
{
return;
}
try
{
UIImage image = ((UIImageView)Control).Image;
UIImage coloredImage = null;
UIGraphics.BeginImageContextWithOptions(image.Size, false, 0.0f);
using (CGContext context = UIGraphics.GetCurrentContext())
{
context.TranslateCTM(0, image.Size.Height);
context.ScaleCTM(1.0f, -1.0f);
//var rect = new RectangleF(0, 0, (float)(image.Size.Width * image.CurrentScale), (float)(image.Size.Height * image.CurrentScale));
var rect = new RectangleF(0, 0, (float)(image.Size.Width), (float)(image.Size.Height));
// draw image, (to get transparancy mask)
context.SetBlendMode(CGBlendMode.Normal);
context.DrawImage(rect, image.CGImage);
// draw the color using the sourcein blend mode so its only draw on the non-transparent pixels
context.SetBlendMode(CGBlendMode.SourceIn);
context.SetFillColor(color.ToCGColor());
context.FillRect(rect);
coloredImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
}
((UIImageView)Control).Image = coloredImage;
}
catch (ObjectDisposedException)
{
return;
}
}
public static void UpdateBorder(this UIView nativeControl, Color color, int thickness)
{
nativeControl.Layer.BorderColor = color.ToCGColor();
nativeControl.Layer.BorderWidth = thickness;
}
