Both in the old and new toolboxes, you can make a transparent canvas using the 'transparent style when you create the `canvas%' object.
If I understand the issue, though, putting a `button%' instance on top of a `canvas%' doesn't really work in either toolbox. Also, neither toolbox currently lets you paint the background of a panel (which can contain buttons and other controls). I think that panel drawing could be made configurable in the new toolbox --- after everything else is in place. At Mon, 25 Oct 2010 14:10:13 +0100, Noel Welsh wrote: > I'm guessing this is a limitation of the current windowing toolkit. > There is a new toolkit under development here: > > http://github.com/mflatt/gr2 > > I'm going to look at transparency support in the new toolkit, but it > will take me a while to find the time. > > HTH, > N. > > BTW, Racket doesn't use CamelCase. The dash is the conventional > separator within an identifier. like-this not LikeThis > > On Thu, Oct 21, 2010 at 10:28 AM, Christophe Vandenberghe > <[email protected]> wrote: > > Hi, > > > > Yeah, if you want to draw some text that's fine. But even if you want to > > import an image that has a transparent background onto a drawing canvas, it > > does not support the transparency. It adds a background color. So that > > doesn't work either. > ... > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
