How do you clear an NSView when drawing outside of drawRect:?
I added and positioned a custom view on top another view (addSubView:positioned:relativeTo:) that draws a complex image so that I can draw selections in my custom view without having to worry about redrawing my original image or using a cached image. Inside my mouseDragged: implementation, I lock my custom view's focus, attempt to erase the view using fillRect with clearColor (which doesn't work), draw my selection, then unlock the focus. When that didn't work (and I tried returning yes and no for isOpaque), I went ahead and just did a setNeedsDisplay:YES on my custom view and just drew the selection in drawRect:. That works but there's a noticeable lag while the mouse is being dragged.
In Carbon, I was able to do the above by using an overlay and CGContextClearRect(). The only thing I can think of to try next is to use similar logic in Cocoa and to place the custom view in a borderless window and use NSRectFillUsingOperation(rect, NSCompositeClear). I was hoping to avoid having to do that and deal with keeping the two view's positions and sizes in sync.
-Chinh Nguyen [EMAIL PROTECTED] _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
