Drag and drop in Tkinter. How difficult is it?

[Marc]

Hi all,

I was thinking about developing a drag and drop application and was curious
how difficult it is to do. Basically I want to have a set of objects that I
move around the screen and drop into place.

Anyone else ever done it? Got any tips?

Thanks,
Marc

 

[Cameron Laird]

Hi all,

I was thinking about developing a drag and drop application and was curious
how difficult it is to do. Basically I want to have a set of objects that I
move around the screen and drop into place.

.
.
.
LOTS of applications--several I've written, I
know--do this sort of thing. You'll need to
learn about bind(), and most likely the events
<1>
<B1-Motion>
<ButtonRelease-1>
in particular: you'll teach <1> to start a
drag, <B1-Motion> to display the dragged object
moving around the screen, and <ButtonRelease-1>
to finish the drop.

Have you read <URL: http://
groups.google.com/groups?as_q=drag+drop+tkinter&as_ugroup=comp.lang.python >?

 

[Christos TZOTZIOY Georgiou]

[Marc]

I was thinking about developing a drag and drop application and was curious
how difficult it is to do. Basically I want to have a set of objects that I
move around the screen and drop into place.

- Cameron -

LOTS of applications--several I've written, I
know--do this sort of thing. You'll need to
learn about bind(), and most likely the events
<1>
<B1-Motion>
<ButtonRelease-1>
in particular: you'll teach <1> to start a
drag, <B1-Motion> to display the dragged object
moving around the screen, and <ButtonRelease-1>
to finish the drop.

Have you read <URL: http://
groups.google.com/groups?as_q=drag+drop+tkinter&as_ugroup=comp.lang.python >?

I should add that drag and drop in the same application can be done
easily, but it's hard to do it between your application and others (too
much window manager dependencies...)

 

[Cameron Laird]

.
.
.

I should add that drag and drop in the same application can be done
easily, but it's hard to do it between your application and others (too
much window manager dependencies...)

.
.
.
Absolutely. My guess is that the original questioner did *not*
have inter-application drag-and-drop in mind, at least not ini-
tially. Those who want to pursue the subject might find the
references at <URL: http://wiki.tcl.tk/DragAndDrop > helpful.

 

[Marc]

Excellent. Thanks for the head start.

A couple of questions.

1) If I want to have a moving object, and not just a cursor that
represents the moving object, do I need to continually pack and unpack
the widget that holds the object and redraw it to give it the
appearance of moving? I know sometimes the redrawing can cause
applications to flicker too much, destroying the effect. I don't know
if there's an optimum way to do this.

2) Also, in reading I found an old module called Tkdnd (drag and
drop). It was an experimental module that was supposed to be updated
but never was. Now I can't find any more information on it. Does this
module still exist or work?

Thanks,
Marc

 

[Michael Peuser]

Hi all,

I was thinking about developing a drag and drop application and was curious
how difficult it is to do. Basically I want to have a set of objects that I
move around the screen and drop into place.

Anyone else ever done it? Got any tips?

There is a nice example here using an as well nice Tree widget:
http://www.esrf.fr/computing/bliss/guides/python/modules/Tree/Tree.html

Kindly
Michael

 

[Cameron Laird]

.
.
.

1) If I want to have a moving object, and not just a cursor that
represents the moving object, do I need to continually pack and unpack
the widget that holds the object and redraw it to give it the
appearance of moving? I know sometimes the redrawing can cause

.
.
.
No! Just move the canvas object to follow the Motion events.

 

[Cameron Laird]

.
.
.

2) Also, in reading I found an old module called Tkdnd (drag and
drop). It was an experimental module that was supposed to be updated
but never was. Now I can't find any more information on it. Does this
module still exist or work?

.
.
.
'Don't know; 'think it hasn't been maintained in a couple of years.

<URL: http://wiki.tcl.tk/tkdnd > might interest you.

 

[Michael Peuser]

Excellent. Thanks for the head start.

A couple of questions.

I think they will be answered when you look at the link (Tree.py) I posted
yesterday ;-)

Kindly
Michael P