Is there some standard on how to name variables in nested modules? Again and again, I am unsure whether I should name my variables this way or the other way round.

One style is that the local variable of a module is called $self or $this. Seems to be the common style.
So far so good. A problem arises when I use the local-module-var of the next level up within a nested module one level below. How should I name the former $self here? $toplevel_self? If I go down this path, I end up with some modules where I refer to a specific var by $self (probably the top-level module) and in other parts of my app, I name this var $that_toplevel_self, $parent or similar. This is especially awkward when the top-level $self contains some global config vars for my app.

So, is there a good argument for always naming my var $self/$this? Or is the other style I exemplify below equally sane, or even more helpful in a nested modules environment? Any hints which style I should use to adhere to "good coding style", or readability, when other developers join my projects?
Some pseudo-code to explain what I am talking about: 
package App;

sub new {
    my ($class, %args) = @_;

    my $self = bless { %args }, $class;

        $self->{widget}    = App::Widget->new( $self );

    return $self;
}

package App::Widget;
    my( $class, $self ) = @_;

    my $widget = bless {  }, $class;

        $self->{menu} = App::Widget::Menu->new( $self, $widget );

    return $self;
}

package App::Widget::Menu;

sub new {
    my( $class, $self, $widget ) = @_;

    my $menu = bless {  }, $class;

        # let's do something with %{ $self } here;
        $self->{some_arg} = 1;
        $self->{menu}->BackgroundColor(222,222,222);
}

[download]

In reply to Advice please on variable naming style in modules by isync

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.