public static void BeginImageContextWithOptions(CGSize size, bool opaque, nfloat scale)
{
// Create new image context
ColorSpace = CGColorSpace.CreateDeviceRGB();
Context = new CGBitmapContext(null, (int)size.Width, (int)size.Height, 8, 0, ColorSpace, CGImageAlphaInfo.PremultipliedLast);
// Flip context vertically
var flipVertical = new CGAffineTransform(1, 0, 0, -1, 0, size.Height);
Context.ConcatCTM(flipVertical);
// Save previous context
ImageSize = size;
PreviousContext = NSGraphicsContext.CurrentContext;
NSGraphicsContext.CurrentContext = NSGraphicsContext.FromCGContext(Context, true);
}
public void Draw(CGContext ctx, CGColor foregroundColor, double x, double y)
{
bool tempForegroundSet = false;
// if no color attribute is set for the whole string,
// NSLayoutManager will use the default control foreground color.
// To override the default color we need to apply the current CGContext stroke color
// before all other attributes are set, otherwise it will remove all other foreground colors.
if (foregroundColor != null && !Attributes.Any(a => a is ColorTextAttribute && a.StartIndex == 0 && a.Count == Text.Length))
{
// FIXME: we need to find a better way to accomplish this without the need to reset all attributes.
ResetAttributes(NSColor.FromCGColor(foregroundColor));
tempForegroundSet = true;
}
ctx.SaveState();
NSGraphicsContext.GlobalSaveGraphicsState();
var nsContext = NSGraphicsContext.FromCGContext(ctx, true);
NSGraphicsContext.CurrentContext = nsContext;
using (var TextLayout = new NSLayoutManager())
{
TextLayout.AddTextContainer(TextContainer);
TextStorage.AddLayoutManager(TextLayout);
TextLayout.DrawBackgroundForGlyphRange(new NSRange(0, Text.Length), new CGPoint(x, y));
TextLayout.DrawGlyphsForGlyphRange(new NSRange(0, Text.Length), new CGPoint(x, y));
TextStorage.RemoveLayoutManager(TextLayout);
TextLayout.RemoveTextContainer(0);
}
// reset foreground color change
if (tempForegroundSet)
{
ResetAttributes();
}
NSGraphicsContext.GlobalRestoreGraphicsState();
ctx.RestoreState();
}
