Re: ScreenSaver with a subview won't preview
Re: ScreenSaver with a subview won't preview
- Subject: Re: ScreenSaver with a subview won't preview
- From: Stéphane Sudre <email@hidden>
- Date: Tue, 12 Aug 2003 09:28:27 +0200
On mardi, ao{t 12, 2003, at 08:08 AM, Steve Milano wrote:
Are screen effects modules really the black art they seem to be
sometimes?
I was messing around with some code from the book "Cocoa Programming"
by Anguish, Buck, & Yacktman, and was able to adapt the "LotsOfWords"
application from Appendix B to a neat screen saver, er, effects,
module. LotsOfWords shows random words from a given list in random
sizes and locations, and translated nicely as a screen effect. If
you're curious, you can see the result here:
http://do-boy.com/downloads/vocabsaver.sit (236 K)
With a few adjustments, I was able to take the class MYWordView and
set it as a subview of the ScreenSaverView. In doing so, I came across
a problem that's plagued me every time I've used a subview in a screen
saver: The preview doesn't show the screen saver, just a black
rectangle. In this case, it turned out to be better to show a static
preview anyway, as it takes a while to load the word list, but usually
this is not so desirable.
So is there a way to have the preview also show the subview, as the
actual screen saver does?
Sure, you usually just have to add the subview in
initWithFrame:isPreview:
For example of screensavers doing this, you can have a look at the ones
available here (since the source code is available):
http://s.sudre.free.fr/Software/WBSoftware.html
Most of them are adding a NSOpenGLView, SaveHollywood is adding a
NSMovieView,
You can also have a look at the Alphabet Sample code on the ADC Sample
code home page.
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