private UIImage CropImage(UIImage image, CGRect clipRect, int width, int height)
{
CGSize sz = new CGSize(width, height);
if (UIScreen.MainScreen.Scale == 2.0)
{
UIGraphics.BeginImageContextWithOptions(sz, true, 0);
}
else
{
UIGraphics.BeginImageContext(sz);
}
UIGraphics.RectClip(clipRect);
image.DrawAsPatternInRect(clipRect);
UIImage newImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(newImage);
}
public override void Draw(CGRect rect)
{
var boundsRect = Bounds;
boundsRect.Height = drawHeight;
if (SizeF.Equals(boundsRect.Size, lastBoundsSize))
{
RegenerateImages();
lastBoundsSize = boundsRect.Size;
}
nfloat width = boundsRect.Size.Width;
nfloat drawPercent = percent;
if (((width - knobWidth) * drawPercent) < 3)
{
drawPercent = 0.0f;
}
if (((width - knobWidth) * drawPercent) > (width - knobWidth - 3))
{
drawPercent = 1.0f;
}
if (endDate != DateTime.MinValue)
{
var interval = (endDate - DateTime.Now).TotalSeconds;
if (interval < 0.0)
{
endDate = DateTime.MinValue;
}
else
{
if (percent == 1f)
{
drawPercent = (float)Math.Cos((interval / animationDuration) * (Math.PI / 2.0));
}
else
{
drawPercent = 1.0f - (float)Math.Cos((interval / animationDuration) * (Math.PI / 2.0));
}
PerformSelector(new Selector("setNeedsDisplay"), null, 0.0);
}
}
CGContext context = UIGraphics.GetCurrentContext();
context.SaveState();
UIGraphics.PushContext(context);
if (drawPercent != 1.0)
{
var sliderOffRect = boundsRect;
sliderOffRect.Height = sliderOff.Size.Height;
sliderOff.Draw(sliderOffRect);
}
if (drawPercent > 0.0f && drawPercent < 1.0f)
{
nfloat onWidth = knobWidth / 2 + ((width - knobWidth / 2) - knobWidth / 2) * drawPercent;
var sourceRect = new CGRect(0, 0, onWidth * scale, sliderOn.Size.Height * scale);
var drawOnRect = new CGRect(0, 0, onWidth, sliderOn.Size.Height);
CGImage sliderOnSubImage = sliderOn.CGImage.WithImageInRect(sourceRect);
context.SaveState();
context.ScaleCTM(1, -1);
context.TranslateCTM(0, -drawOnRect.Height);
context.DrawImage(drawOnRect, sliderOnSubImage);
context.RestoreState();
}
if (drawPercent == 1.0)
{
nfloat onWidth = sliderOn.Size.Width;
var sourceRect = new CGRect(0, 0, onWidth * scale, sliderOn.Size.Height * scale);
var drawOnRect = new CGRect(0, 0, onWidth, sliderOn.Size.Height);
CGImage sliderOnSubImage = sliderOn.CGImage.WithImageInRect(sourceRect);
context.SaveState();
context.ScaleCTM(1, -1);
context.TranslateCTM(0, -drawOnRect.Height);
context.DrawImage(drawOnRect, sliderOnSubImage);
context.RestoreState();
}
context.SaveState();
UIGraphics.PushContext(context);
var insetClipRect = boundsRect.Inset(4, 4);
UIGraphics.RectClip(insetClipRect);
DrawUnderlayersInRect(rect, drawPercent * (boundsRect.Width - knobWidth), boundsRect.Width - knobWidth);
UIGraphics.PopContext();
context.RestoreState();
context.ScaleCTM(1, -1);
context.TranslateCTM(0, -boundsRect.Height);
CGPoint location = boundsRect.Location;
UIImage imageToDraw = knobImage;
if (this.Highlighted)
{
imageToDraw = knobImageOff;
}
nfloat xlocation;
if (drawPercent == 0.0f)
{
xlocation = location.X + 3 + (nfloat)Math.Round(drawPercent * (boundsRect.Width - knobWidth + 2));
}
else
{
xlocation = location.X - 5 + (nfloat)Math.Round(drawPercent * (boundsRect.Width - knobWidth + 2));
xlocation = xlocation < 0.0f ? 0.0f : xlocation;
}
var rectToDraw = new CGRect(xlocation, location.Y + 9.5f, knobWidth, knobImage.Size.Height);
context.DrawImage(rectToDraw, imageToDraw.CGImage);
UIGraphics.PopContext();
context.RestoreState();
}