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.IX Title "MainWindow 3"
.TH MainWindow 3 2025-07-14 "perl v5.42.0" "User Contributed Perl Documentation"
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.SH NAME
Tk::MainWindow \- Root widget of a widget tree
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    use Tk;
\&
\&    my $mw = MainWindow\->new( ... options ... );
\&
\&    my $this = $mw\->ThisWidget \-> pack ;
\&    my $that = $mw\->ThatWidget;
\&    ...
\&
\&    MainLoop;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Perl/Tk applications (which have windows associated with them) create
one or more \fBMainWindow\fRs which act as the containers and parents
of the other widgets.
.PP
\&\fBTk::MainWindow\fR is a special kind of Toplevel widget. It is
the root of a widget tree. Therefore \f(CW\*(C`$mw\->Parent\*(C'\fR returns
\&\f(CW\*(C`undef\*(C'\fR.
.PP
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 \*(AqPtk\*(Aq 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 \f(CW" #n"\fR is appended where the number \f(CW\*(C`n\*(C'\fR is set to get
a unique value.
.PP
Unlike the standard Tcl/Tk\*(Aqs wish, perl/Tk allows you to create
several MainWindows.  When the \fIlast\fR \fBMainWindow\fR is destroyed
the Tk eventloop exits (the eventloop is entered with the call of
\&\f(CW\*(C`MainLoop\*(C'\fR). 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.
.SH METHODS
.IX Header "METHODS"
You can apply all methods that a Toplevel widget accepts.
.PP
The method \fR\f(CI$w\fR\fI\fR\->\fBMainWindow\fR applied to any widget will return the
\&\fBMainWindow\fR to which the widget belongs (the  MainWindow belongs to itself).
.SH MISSING
.IX Header "MISSING"
Documentation is incomplete.
Here are \fIsome\fR missing items that should be explained in
more detail:
.IP \(bu 4
The new mechanism for MainWindows is slightly different to
other widgets.
.IP \(bu 4
There no explanation about what resources are bound
to a MainWindow (e.g., ClassInit done per MainWindow)
.IP \(bu 4
Passing of command line options to override or augment
arguments of the \f(CW\*(C`new\*(C'\fR method (see Tk::CmdLine).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Tk::Toplevel
Tk::CmdLine