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.TH TCL-PERL 1 "2000-12-30" "perl v5.8.0" "User Contributed Perl Documentation"
Tcl vs perl \- very old suspect documentation on porting.
This isn't really a .pod yet, nor is it Tcl vs perl
it is a copy of John's comparison of Malcolm's original perl/Tk
port with the current one. It is also out-of-date in places.
\& From: john@WPI.EDU (John Stoffel )
\& Here are some thoughts on the new Tk extension and how I think the
\& organization of the commands looks. Mostly, I'm happy with it, it
\& makes some things more organized and more consistent with tcl/tk, but
\& since the overlying language is so different, I don't think we need to
\& follow exactly the tcl/tk model for how to call the language.
\& The basic structure of the Tk program is:
\& $top = MainWindow->new();
\& This is pretty much the same as tkperl5a5, with some cosmetic naming
\& changes, and some more useful command name and usage changes. A quick
\& comparison in no particular order follows:
\& ------------------------------- -----------------------------------
\& $top=tkinit(name,display,sync); $top=MainWindow->new();
\& tkpack $w, ... ; $w->pack(...)
\& $w = Class::new($top, ...); $w = $top->Class(...);
\& tkmainloop; Tk::MainLoop;
\& tkbind($w,"<key>",sub); $w->bind("<key>",sub);
\& tkdelete($w, ...); $w->delete(...);
\& $w->scanmark(...); $w->scan("mark", ...);
\& $w->scandragto(...); $w->scan("dragto", ...);
\& $w->tkselect(); $w->Select();
\& $w->selectadjust(...); $w->selection("adjust", ...);
\& $w->selectto(...); $w->selection("to", ...);
\& $w->selectfrom(...); $w->selection("from", ...);
\& $w->tkindex(...); $w->index(...);
\& tclcmd("xxx",...); &Tk::xxx(...) # all Tk commands, but no Tcl at all
\& tclcmd("winfo", xxx, $w, ...); $w->xxx(...);
\& $w->grabstatus(); $w->grab("status");
\& $w->grabrelease(...); $w->grab("release", ...);
\& update(); Tk->update();
\& idletasks(); Tk->update("idletasks");
\& wm("cmd",$w, ...); $w->cmd(...);
\& destroy($w); $w->destroy();
\& $w->OptionGet(name,Class)
\& $w = Entry::new($parent,...)
\& $w = $parent->Entry(...)
\& As this allows new to be inherited from a Window class.
\& 1st element of list is treated as "method" if y is an object reference.
\& (You can have -command => [a,b,c,d,e] too; b..e get passed as args).
\& Object references are now hashes rather than scalars and there
\& is only ever one such per window. The Tcl_CmdInfo and PathName
\& are entries in the hash.
\& (This allows derived classes to
\& re-bless the hash and keep their on stuff in it too.)
\& Tk's "Tcl_Interp" is in fact a ref to "." window.
\& You can find all the Tk windows descended from it as their object
\& references get added (by PathName) into this hash.
\& $w->MainWindow returns this hash from any window.
\& I think that it should extend to multiple tkinits / Tk->news
\& with different Display's - if Tk code does.
\& Finally "bind" passes window as "extra" (or only)
\& Tk::Button->bind(<Any-Enter>,"Enter");
\& Binds Enter events to Tk::Button::Enter by default
\& but gets called as $w->Enter so derived class of Button can just
\& define its own Enter method. &EvWref and associated globals and race
\& conditions are no longer needed.
\& One thing to beware of : commands bound to events with $widget->bind
\& follow same pattern, but get passed extra args :
\& $widget->bind(<Any-1>,[sub {print shift}, $one, $two ]);
\& When sub gets called it has :
\& 1st extra arg is reference to the per-widget hash that serves as the
\& perl object for the widget.
\& Every time an XEvent a reference to a special class is placed
\& in the widget hash. It can be retrieved by $w->XEvent method.
\& The methods of the XEvent class are the
\& Tcl/Tk % special characters.
\& $widget->bind(<Any-KeyPress>,
\& print $w->PathName," ",$e->A," pressed ,$e->xy,"\en");
\& XEvent->xy is a special case which returns "@" . $e->x . "," . $e->y
\& which is common in Text package.
\& Because of passing a blessed widget hash to "bound" subs they can be
\& bound to (possibly inherited) methods of the widget's class:
\& Class->bind(<Any-Down>,Down);
\& -command and friends can take a list the 1st element can be a ref to
\& as sub or a method name. Remaining elements are passed as args to the
\& sub at "invoke" time. Thus :
\& $b= $w->Button(blah blah, '-command' => [sub{print shift} , $fred ]);
\& Should do the trick, provided $fred is defined at time of button creation.
\& Thus 1st element of list is equivalent to Malcolm's -method and second
\& would be his -slave. Any further elements are a bonus and avoid
\& having to pass ref to an array/hash as a slave.
projects / OpenSPARC-T2-DV / blob