How to get the habdle of the object I created in Gtk's Drawing area.

[songu]

Hi, I am trying to create a GUI, where user can add stuff to a system by drawing it in the canvas, then later on user play around with new object. ie, move, delete, assign properties, etc. But I could not find how to get the handle of the object so that I can refer to it later.

Please help and thanks in advance.

 

[ericbrunson]

When you instantiate your new canvas a pointer to it should be returned.

 

[songu]

Thanks for the reply, but my question is how to get the handles of objects created in the canvas, not the canvas itself.

 

[ericbrunson]

The only thing I can think of (if it's not in the documentation) would be to dir() the canvas object and see it it has methods to get them.

 

[btcpar]

Hi,
Yesterday I posted one question about how to get the coordenates of one dot in a dot graph. I resolved the problem using the command "bind" and ericbrunson told me that there was a similar thread.
I don't know if you want to do something similar, but take a look to this command, maybe it will resolve your problem.

Example

define a function ("callback")

def callback(event):
print 'coordenates:',event.x,event.y

join you canvas to the function defined before

display=Canvas(...........)
display.bind("<Double-Button-1",callback)

when you click twice in the Canvas place, the coordenates will be printed.

I don't know if that is what you wanted.
I hope it helps

 

[songu]

Hi, Guys

Thanks again for the posts. My problem is different than btcpar's.

I find in Tkinter, when I create a object in the canvas, it will return a handle, say "item". Then later, I can just use canvas.move(item, options) to move it to a new location, and use canvas.delete(item) to delete. How can I do similar things in PyGTK? Or maybe without using drawing area, can I use some other widgets?