Big big nono.
Chameleons should not be housed with other animals. It would be nice if they could to save space and resources. But Chameleoncrow was right, he could very well try to eat your leopard gecko at some time. Plus there is the issue of diseases that the two species could pass on to one another. That, plus competition over food and just general stress are all some things that could happen.
Arent Leopard Geckos also situated in a different type of habitat? (not sure, dont know much about them
) But just too many factors here to be able to work around sorry.
If your still interested in getting a chameleon there are enclosures that dont take up much room. 2x2x4 cages are the norm it seems and they fit nicely into corners for example. Or you could just make your own. Its up to you!
Hope some of this info helped...
Erin
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1:0 Veileds (Gene, RIP Aurora)
1:1 Albino Clawed Frogs (Phedre and Jos)
?? Fire belly toad (Harold)
Various cats and dogs 