I am trying to create an interface that allows dragging and dropping buttons, I am currently using Tk:Table to manage the button layout, but am open to other suggestions. The problem i am running into is I can't figure out how to translate the mouse cursor location on the window to the corresponding column and row in the table (findCell subroutine).
The goal is to dynamically create buttons, then drag any button to a new location, shifting the buttons underneath to the left or right.

Any help would be greatly appreciated!

Here is my test script (I removed all of my failed attempts at getting the column and row locations)

use warnings;
use strict;
use Tk;
use Tk::Table;
use Data::Dumper;

my $buttonsPerRow = 5;
$buttonsPerRow -= 1; #button numbering starts from 0...
my $row = 0;
my $col = 0;
my $buttonNum = 0;
my @buttons;

my $mw = tkinit();
my $menuFrame = $mw->Frame()->pack(-expand=>1,-fill=>'both');
my $buttonFrame = $mw->Frame()->pack(-expand=>1,-fill=>'both');

my $table = $buttonFrame->Table(
        -columns => 5,
        -scrollbars => 'se',
        -fixedrows => 1,
    )->pack(-expand=>1,-fill=>'both');

my $addButton = $menuFrame->Button(
        -text            => 'Add Button',
        -command     => sub{
            $buttons[$buttonNum] = $table->Button();
            $col>$buttonsPerRow?$row++:undef;
            $col>$buttonsPerRow?$col=1:$col++;
            print "Button $buttonNum->$row:$col\n";
            $buttons[$buttonNum]{'row'} = $row;
            $buttons[$buttonNum]{'col'} = $col;
            $table->put($row,$col,$buttons[$buttonNum]);
            configureButton($buttonNum);
            $buttonNum++;
        },
    )->pack(-side=>'top');


################################
#DragNDrop
my $isDragging = 0; #boolean - left mouse button pressed and dragging
my $selectedButton = 0;
$mw->bind('<Motion>', \&motion);
my %tableRows;
my %tableCols;

################################

$mw->MainLoop();

sub configureButton{
    #configure the new button
    my $btnNum = shift;
    $buttons[$btnNum]->bind('<Enter>', sub{
                $selectedButton = $btnNum;
            }
        );
    $buttons[$btnNum]->configure(
        -text => "Button $btnNum",
        -command => sub{
            print "Button $btnNum pressed\n";
        }
    );
    $buttons[$btnNum]->bind('<ButtonPress-1>', \&buttonPress);
    $buttons[$btnNum]->bind('<ButtonRelease-1>', \&buttonRelease);
}

sub motion {
    #what to do when the mouse is moving
    my($widget) = @_;
    my $e = $widget->XEvent;#get Tk Event
    if ($isDragging){
        findCell($e->X,$e->Y);    #get mouse cursor X/Y coorinates fro
+m event
    }
    return unless $isDragging;
}

sub buttonPress {
    #what to do when the left mouse button is pressed
    undef %tableRows; #undefine %tableRows hash in case row height has
+ changed
    undef %tableCols; #undefine %tableCols hash in case column width h
+as changed
    for(my $btnNum=0;$btnNum<@buttons;$btnNum++){ #recreate %tableRows
+ and %tableCols - key=XY_coordinate val=row/col_number
        $tableRows{$buttons[$btnNum]->rooty} = $buttons[$btnNum]{'row'
+};
        $tableCols{$buttons[$btnNum]->rootx} = $buttons[$btnNum]{'col'
+};
    }
    $isDragging = 1;
    #Debugging... show root location of each row and column
    #foreach my $key (sort keys %tableRows){
    #    print "$key\n";
    #}
    #print "------\n";
    #foreach my $key (sort keys %tableCols){
    #    print "$key\n";
    #}
}

sub buttonRelease {
    #what to do when the left mouse button is released
    $isDragging = 0;
}

sub findCell{
    my $tmpX = shift;
    my $tmpY = shift;
    print "$tmpX:$tmpY\n";
    #determine which row and column the mouse cursor is currently hove
+ring over
    # based on mouse X/Y coordinates.
}
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