Re: [pygtk] drag and drop types

[John Finlay]

Thomas Mills Hinkle wrote:
Hello -- I'm working with drag and drop and finding some frustrations.
I've noticed that text buffers and entry boxes have drag-n-drop enabled
by default. If I open gedit, type some text and drag it across into my
pygtk app, the text shows up in the widget without me having to do any
coding.
However, if I open Mozilla Firefox and drag text, I'm out of luck -- the
Entry and Textview widgets don't accept it.
Now here's the kicker: I have set up a treeView to accept drag-and-drop
text on my own, basing my code on the TreeView tutorial (thanks!). My
TreeView will accept text dragged from firefox, but not text dragged
from gedit.
So, I imagine this means that firefox and gedit are offering up
different types of selections. Of course, I would like to handle
any kind of selection that I can turn into plain text. Perhaps the vital
lines are...
self.ingTree.enable_model_drag_dest([('text/plain',0,0)],
                                           gtk.gdk.ACTION_DEFAULT |
                                           gtk.gdk.ACTION_COPY |
                                           gtk.gdk.ACTION_MOVE)
Now I would think that gedit and other programs would be
offering up some variant of text/plain. So my question is: what are they
offering up? Can some point me to documentation of dnd types, etc. Is
there a simple way to create a pygtk test program that will tell
me what formats a selection I drag onto it is offering up?
 

Here's a small program that prints out the drag targets:
##########################
#!/usr/local/env python
import pygtk
pygtk.require('2.0')
import gtk
def gettargets(wid, context, x, y, time):
   for t in context.targets:
       print t
   return True
w = gtk.Window()
w.set_size_request(100, 100)
w.drag_dest_set(0, [], 0)
w.connect('drag_motion', gettargets)
w.show_all()
gtk.main()
##########################
Running this and dragging from gedit I get:
GTK_TEXT_BUFFER_CONTENTS
UTF8_STRING
COMPOUND_TEXT
TEXT
STRING
As you can see gedit doesn't support text mime types so you would need 
to add the text targets to your drag destination - something like:

self.ingTree.enable_model_drag_dest([('text/plain',0,0),
                                    ('TEXT', 0, 1),
                                    ('STRING', 0, 2),
                                    ('COMPOUND_TEXT', 0, 3),
                                    ('UTF8_STRING', 0, 4)],                                                                      
                                    gtk.gdk.ACTION_DEFAULT |
                                    gtk.gdk.ACTION_COPY |
                                    gtk.gdk.ACTION_MOVE)

Dragging from Netscape I get:
text/html
text/unicode
text/plain
gedit uses the TextView widget and doesn't support any of these targets. 
I suspect that Firefox is similar to Netscape and so you can't drag from 
Firefox to gedit and vice versa. You can cut and paste between the two. 
You can use the tutorial program:

http://www.moeraki.com/pygtktutorial/pygtk2tutorial/examples/getselection.py
to print out the selection targets.
John
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