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Re: [macOS] Tcl::pTk Drag&Drop

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Christopher Chavez
February 2, 2019 07:07
Re: [macOS] Tcl::pTk Drag&Drop
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(Trying to send this to the list again for reference and to see if I can send emails now. It didn’t go through the first time because GMX had been blocked by <>)

> On Sep 21, 2018, at 6:01 AM, welle Ozean via tcltk < <>> wrote:
> Using Tcl::pTk I am trying to implement Drag&Drop on macOS without success. According to its documentation, Tcl::pTk should support it. This is what I am trying now (slightly adapted from my version for Windows and Perl/Tk):
> $MyWidget->DropSite(-dropcommand => [\&accept_drop, $tap], -droptypes => (['Local', 'tkdnd']));
> sub accept_drop {
>     my ($tab) = @_;
>     my $filePath;
>      eval {
> 		if ($^O eq 'MSWin32') {
> 			$filePath = $tab->SelectionGet(-selection => $selection,
> 							  'STRING');
> 		}
> 		else {
> 			$filePath = $tab->SelectionGet(-selection => $selection,
> 							  'FILE_NAME');
> 		}
>       }
> #DO THINGS with $filePath
> }
> I have downloaded a binary of tkdnd (libtkdnd2.8.dylib). How do I let Tcl::pTk know of this library? Or there is any way to implement it without adding new libraries (I am using the Tcl shipped with macOS).
> Thanks
> Welle

Hi Welle,

As Vadim stated, neither Tcl::pTk nor do much to be aware of Tcl/Tk modules; Tcl::pTk currently only looks for a few that are required (Tklib, Tix, TkTable) or have Perl-wrapper syntax for (BLTNotebook). Ideally, tkdnd should be installed where `package require` is all that’s needed to use it; I don’t know my way around the other `package ifneeded` or other commands that might be needed if Tcl/Tk needs to manually be told where it is. There is at least one undocumented subroutine in Tcl::pTk that might be useful, `$MW->interp->pkg_require()`, however I do not know what its advantages or limitations are over just using `$MW->interp->Eval("package require tkdnd”)`. Though this step might be done automatically by Tcl::pTk depending on the syntax used.

Someone recently added tkdnd to MacPorts, so I might give it a try soon. I wonder if tkdnd support might be something to include in Tcl::pTk, similar to what’s done for TkTable and other Tk extensions.

Also, be aware that there have been some recent changes since tkdnd 2.8 was released which address issues on macOS; <>

Christopher A. Chavez
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