Re: A Drag and Drop (perl/Tk) question.

In your DragStart function, the following line:

my $idx = $w->GetNearst($e->x, $e->y);
[download]

Should read:

my $idx = $w->GetNearest($e->x, $e->y);
[download]

Your Drop function needs some changes as well. Instead of grabbing the x and y values through the properties of the directory tree, you should use the values that the Drop event sends through:

sub Drop{
    my ($lb, $dnd_source, $c_dest, $sel, $dest_x, $dest_y) = @_;
    my $group_item = $dnd_source->cget('-text');
    my $nearest = $lb->GetNearest($dest_x, $dest_y);
    if (defined $nearest){
        my $dir_item = $lb->entrycget($nearest, '-text');
        print "*** $dir_item ***\n";    ### DEBUG: Show target value
        &AddGroupToDir($group_item, $dir_item);
        $lb->see($nearest);
    }
}
[download]

O'Reilly has a good Drag-and-Drop Primer available; you should check it out.

-- grummerX

Update: Removed HTML tags in code. (stupid, stupid...)

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Re: Re: A Drag and Drop (perl/Tk) question. by hiseldl (Priest) on Jul 29, 2002 at 18:09 UTC
grummerX is correct with his new Drop method, you need to grab X and Y from the source event in order to get the correct list item using GetNearest. Also, the example given at Drag-and-Drop Primer binds a mouse event, for the drag start, to all widgets that are DND capable. This approach works better for canvas to canvas image or shape dropping than list to list dropping. A better example would be Drag and drop with Perl/Tk as this covers DND from list to list. -- hiseldl	[reply]
Re: Re: A Drag and Drop (perl/Tk) question. by blackadder (Hermit) on Jul 29, 2002 at 16:09 UTC
I do not know now what’s really is going on? I've started with amending this line : `my $idx = $w->GetNearst($e->x, $e->y);<br><br>` [download] To this (as it was suggested ) : `my $idx = $w-><b>GetNearest</b>($e->x, $e->y);` [download] And I got loads of errors because of the "b" and "/b". So I am back to 1^2. Recently I have read an article on PM about a guy who has given up programming. It was very interesting read, and I couldn’t really see why he did this….Now I can.	[reply] [d/l] [select]