Hi, My suggestion is to create a pool of callbacks in C, that can be referenced com Crystal. Don't know Crystal, but I'm assuming it can call C functions.
The control callbacks are registered with a description of its signature. So whenever a callback is set in Crystal, you look for its name in the IUP class (using internal IUP functions) and you get a description of its signature, then retrieve a callback in C from your pool with that signature and set it using IupSetCallback. When the callback in C is called, it will repass its parameters to Crystal, calling the Crystal function that was set originally. In Lua we do a very similar approach. Best, Scuri Em seg., 11 de mai. de 2020 às 10:23, Ben Hansen <aeta@watashi-no.space> escreveu: > Hello > > I've been trying to create an IUP language binding for the Crystal > language[1]. What I've got so far works fine, however, I haven't been > able to bind `IupSetCallback` or `IupSetCallbacks` in an idiomatic way. > > I created a post on the Crystal forums about this[2], the summary is > that: to have this work in a "nice" way, either the original C function > needs to have a `void* data`-type argument that can be used[3], or I > create a singleton class which stores all the (Crystal) callbacks and > looks up the appropriate one when writing the (C) callback. > > While the first option doesn't seem possible (considering it'd > probably be a breaking change with no benefit), is there some way in > IUP that I can use to be notified when the set callback isn't needed > anymore as the control/dialog isn't either? > > Thanks, > Ben > > [1]: https://crystal-lang.org > > [2]: https://forum.crystal-lang.org/t/c-binding-non-void-callback/2079 > > [3]: similar to `gpointer data` for `g_signal_connect_data()` in Gtk > > https://developer.gnome.org/gobject/stable/gobject-Signals.html#g-signal-connect-data > > > _______________________________________________ > Iup-users mailing list > Iup-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iup-users >
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