Dropping file on icon

Instead of dragging your script to the dock, youll want to create a custom launcher (.desktop file) and inside that set the MimeType that it accepts.

Yes, I created a .desktop file, but the problem was the same, so I thought I better ask it.
Now I'm going to try it out, big thanks for your fast reply!

Did you set the proper MimeType in that launcher?

Also you might have to quit Docky, and then delete the files in ~/.cache/docky/ which parses/caches the contents of the launchers.

Now just for try I set the MimeType to text/html. (to be honest I want it to accept every file, but this is just for testing)
So this is my .desktop file:

#!/usr/bin/env xdg-open

[Desktop Entry]
Version=1.0
Type=Application
Terminal=true
Icon[hu_HU]=python
Name[hu_HU]=Teszt
Exec=python /home/semmu/Asztal/test.py
Name=Teszt
Icon=default
MimeType=text/html

Now I'm able to drop a file to it, but the application won't start. (It should write a file, so I could track it, but now there are no output.)
What am I doing wrong?

Oh, I didn't know that I have to "manually" pass the filename as a parameter. Thanks for it!
But my last problem is: how can my program accept every file, no matter what kind of is it? I don't really want to list all the MimeTypes, and the "MimeType=*" does not work :/

I suppose this is perhaps a problem with Docky.

It would make most sense to me that if you completely OMIT the MimeType in the launcher, then Docky should just assume 'any' file and accept. I honestly don't know if that is what it currently does, but that makes the most sense to me.

Verified: if no MimeType is specified it wont accept any files at all.

So please file a bug and I will add this functionality. It's 2 lines of code and I already wrote and tested it, but we need to track it via a bug request. :)

You will have to be using a source compiled version of Docky or using our development PPA to get the change (whenever that PPA updates).

Hmm, to bad. Then I will just list the common MimeTypes, until the new version comes out. (and now I'm using the development PPA, my current version is 2.2.0)

Thanks for your help, now it works as it should!

Thanks Robert Dyer, that solved my question.

I guess it was a bit more than 2 lines of code. But 11 lines is still easy to do. ;-)

Once you file the bug, I'll push the change.

The logic dictates that if there is a MimeType, we only let you drop matching types. If there is no MimeType and the Exec line stipulates it accepts files/uris then we assume any file can be dropped. Otherwise we assume no file drops allowed.

Okay, I filed the bug, hope I done it right... :D
Your explanation is logical, so I would be very thankful if You implemented it :D :)