On Dec 19, 2008, at 6:20 PM, David Alter wrote:
I want to draw in a NSView but not when drawRect is called. To do
this I
understand that I need to call lockFocus before drawing and
unlockFocus
after. The drawing appears to happen but it is not until I
deactivate the
window do I see my results. How can I get it to refresh once I have
done my
drawing?
To test this out I have sub classed NSView and overloaded mouseDown.
I added
the following code.
- (void)mouseDown:(NSEvent *)theEvent ;
{
NSPoint loc = [[self window] mouseLocationOutsideOfEventStream];
loc = [self convertPoint:loc fromView:[[self window] contentView]];
CGContextRef myContext =
(CGContextRef)[[NSGraphicsContext currentContext]graphicsPort];
[self lockFocus];
CGContextSetRGBFillColor (myContext, 1, 0, 0, 1);
CGContextFillRect (myContext, CGRectMake (loc.x, loc.y, 10, 10 ));
[self unlockFocus];
}
This will draw a box for each mouse click, but not until I
deactivate my
window.
What you should do is do all drawing in drawRect:. What happens when
your drawRect: is called? I bet you won't see any of the rects you
had when clicking around.
Instead, maintain a list of rects that need to be drawn. mouseDown:
then simply adds a new rect to the list and calls setNeedsDisplay:.
Or, if you profile things and need more speed, setNeedsDisplayInRect:
If you want things such that only one rect ever is drawn, just have
mouseDown: set the values of that single rect and still call
setNeedsDisplay:
___________________________________________________________
Ricky A. Sharp mailto:rsh...@instantinteractive.com
Instant Interactive(tm) http://www.instantinteractive.com
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