Anders Wallin wrote: >John Prentice wrote: > > >>(a) There are occasions when the UI benefits from being bi-directional. >> >> > >Yes. But I don't know how to program a bidirectional slider or other >widget yet. Maybe someone else can help ? > > > I did some of this in Tk/tcl for a nuclear science project. It is quite tricky. I have a c++ program that backs up the tk/tcl GUI, and handles all "database" functions. When you switch to talk to another device, all the buttons, sliders, some labels, etc. all have to be updated. Unfortunately, c++ "mangles" procedure names before passing the code to the linker. So, you need a "wrapper" to connect the GUI procedure calls to the mangled name that the linker knows the desired procedure by.
I'm guessing that some of the same tricks are needed for Python. In Tk, you bind various widgets to mouse clicks, but you can also assign a variable to the widget, and any change of that variable will update the widget. So, you pass the pointer to the variable to the C program in a procedure, it changes what that pointer points to, and the slider moves, the text in a box changes, etc. Jon ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
