Overriding NSSlider/NSSliderCell: continued
Overriding NSSlider/NSSliderCell: continued
- Subject: Overriding NSSlider/NSSliderCell: continued
- From: email@hidden
- Date: Mon, 11 Feb 2002 12:00:25 -0800
I'm still working on overriding NSSlider and NSSliderCell to change the
knob for specific uses and the behavior to select ranges of values also.
Right now, I'm just overriding the drawBar, the drawInteriorWithFrame,
and I created a new NSImageCell for the knob (with great help from
GNUStep-GUI). I created a palette for that widget, but when I drop it on
a window in IB, I can only resize it on its width: Height is constrained
to 21 pixels as soon as I touch it.
I've looked in the tree of classes to find out which method would do
that. Didn't find it in NSCell nor NSControl. Double checked all the
public methods for NSSlider and NSSliderCell: nothing regarding size.
Somebody has got clues regarding this strange behavior? Maybe is it more
simply IB related?
I believe IB does this because you are a subclass of NSSlider, and I
believe IB is simply hard-coded to know that NSSlider (and, it assumes,
all subclasses) have such a fixed height. AFAIK there is no way to
change this in IB. Log a bug, I guess. I think this is perhaps a
promising area for IB to add functionality: being able to provide
information to IB about things like target/action outlets, other
attributes, sizing characteristics, etc. for custom classes, to make
them behave just as intelligently in IB as the built-in ones.
You may be able to do some of this by writing your own palette; I
haven't looked at that stuff.
Ben Haller
Stick Software
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