The Tk ndexfile(index-entry "bind" "tt" aux )bind command associates Scheme scripts with X events.
Starting with version 3.0 those scripts must be Scheme
closures2. Binding
closures can have parameters. Those parameters are one char symbols
(with the same conventions than the Tcl % char, see the bind
help page for details). For instance, the following Tcl script
unspecified
error
makeotherˆ`=̀13`
gobblecrbind .w <ButtonPress-3> {puts "Press on widget %W at position %x %y"}can be translated into
gobblecr(bind .w "<ButtonPress-3>" (lambda (|W| x y) (format #t"Press on widget~
A at position~
A~
A\
n" |W| x y)))
Note: Usage of verticals bars for the W symbol is necessary here because the Tk toolkit is case sensitive (e.g. W in bindings is the path name of the window to which the event was reported, whereas w is the width field from the event.