CentOS 7.0 - man page for tk::mainwindow (centos section 3)
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MainWindow(3) User Contributed Perl Documentation MainWindow(3)
Tk::MainWindow - Root widget of a widget tree
my $mw = MainWindow->new( ... options ... );
my $this = $mw->ThisWidget -> pack ;
my $that = $mw->ThatWidget;
Perl/Tk applications (which have windows associated with them) create one or more
MainWindows which act as the containers and parents of the other widgets.
Tk::MainWindow is a special kind of Toplevel widget. It is the root of a widget tree.
Therefore "$mw->Parent" returns "undef".
The default title of a MainWindow is the basename of the script (actually the Class name
used for options lookup, i.e. with basename with inital caps) or 'Ptk' as the fallback
value. If more than one MainWindow is created or several instances of the script are
running at the same time the string " #n" is appended where the number "n" is set to get a
Unlike the standard Tcl/Tk's wish, perl/Tk allows you to create several MainWindows. When
the last MainWindow is destroyed the Tk eventloop exits (the eventloop is entered with the
call of "MainLoop"). Various resources (bindings, fonts, images, colors) are maintained or
cached for each MainWindow, so each MainWindow consumes more resources than a Toplevel.
However multiple MainWindows can make sense when the user can destroy them independently.
You can apply all methods that a Toplevel widget accepts.
The method $w->MainWindow applied to any widget will return the MainWindow to which the
widget belongs (the MainWindow belongs to itself).
Documentation is incomplete. Here are some missing items that should be explained in more
o The new mechanism for MainWindows is slightly different to other widgets.
o There no explanation about what resources are bound to a MainWindow (e.g., ClassInit
done per MainWindow)
o Passing of command line options to override or augment arguments of the "new" method
perl v5.16.3 2014-06-10 MainWindow(3)
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