[Dalgo]

I subclassed NSSliderCell and I overrode the - (void)drawBarInside NSRect)aRect flipped BOOL)flipped method in order to draw my own bar. I have no trouble drawing my own bar... the only problem is that under it the standard slider bar is drawn and it is 2 pixels longer than mine. (those two pixels are used for shadow of the slider nob and bar.) I want to make it such that it never draws the bar under mine. I thought that subclassing it and overriding that method would do the trick but it doesn't. Anyone have any idea how I can make it not draw the old bar.

[lindberg]

You're not calling super, right?

Otherwise...

NSCell's main drawing method is -drawWithFrame:inView:. That method typically draws the border (if any) and calls -drawInteriorWithFrame:inView:. I assume NSSliderCell's implementation of the latter method is the one that calls -drawBarInside:flipped: and drawKnob:. Overriding drawBarInside:flipped: certainly used to work, but I'm not sure how things have changed with drawing MacOS X style sliders. You may try overriding one of the other two methods, while making sure to call -drawKnob correctly (something like [self drawKnob:[self knobRectFlipped:[theView isFlipped]]] I think).

[Dalgo]

I'm not calling super. I guess that it must be an oversight on Apple's part. I made my slider longer so it covers the little shadow of the old one. I'll email the bug to Apple since this does seem to be a bug.

[Dalgo]

Well, the strange behavior is not a bug. Here is the reply that I got from Apple:

drawBarInside:flipped: is gives you an opportunity to fill the interior of a slider. e.g. the colour gradient in a RGB colour panel. The bar itself will still be drawn. -[NSSliderCell drawBarInside:flipped:] does nothing.

To override the track drawing completely, override -[NSSliderCell drawWithFrame:inView:], don't call the super, draw your track, and call -[NSSliderCell drawKnob].

Andrew
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