I'd say there is virtually no difference between grab/mousemove, or at least, I've never seen one. Perhaps this is more evident on older systems. I was going to say that *maybe* creating some demanding display calculations by dragging a large image with varying translucency over a second large image could cause some lag, but trying it just now I can't see any noticeable difference between grab/mousemove (Rev 2.9). Perhaps Bjornke you could produce a demo stack that demonstrates the lag?
In any event, for me, having access to mouse events and virtually all engine messages far outweighs what little performance benefit there may be in using grab, if any. The fact that the question "How do you do XYZ while using grab?" comes up so often on this list seems to indicate that the grab command may be of little use in practical applications. And as far as using repeat loops and polling the mouse state goes, this has already been discussed. The original developer of the MetaCard/Revolution engine said not to do it, so I don't. :-) Recently, Richard Gaskin wrote: >>> It's generally considered better practice to use these four handlers >>> for custom dragging operations: >>> >>> mouseDown -- to set a flag >>> mouseMove -- checks the flag and does the work >>> mouseUp -- clears the flag >>> mouseRelease -- also clears the flag >> >> Yes but that method will lag much more then using grab, viewable by >> the lone eye, while most users will never notice the huge processor >> load when using a repeat loop. As a game oriented developer, I prefer >> the second back draw. > > If a drag is complex enough it would seem that choking the processor > might also have an adverse effect, though I can't say I've done > benchmarking under such circumstances; it's hard to measure things > involving user interaction. > > The demos Scott Rossi kindly put together using the four-handler method > seem quite responsive: > <go url "http://www.tactilemedia.com/download/drag_sample.rev";> > > Rossi and Malte have done far more with dragging than I - you guys got > any input on this? Regards, Scott Rossi Creative Director Tactile Media, Multimedia & Design _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
