Mailing List Archive: Help. Tracking ButtonRelease events

Help. Tracking ButtonRelease events

Aug 7, 1999, 5:09 AM

Post #1 of 3 (408 views)

Hello.

I'm writing an application part of which is a GUI to draw graphs.
What i want is create verticies and edges between them,
i create vertex by clicking on Button 1 ( taken from Demo/Tkinter/matt
scripts )
and edge created by clicking on Button 3 and dragging the mouse to the
destination vertex.
In order to do it every vertex binded events ButtonPress-3 and
ButtonRelease-3 ,
the problem i run into is that when i press button 3 and drag it to the
destination vertex,
source vertex gets the ButtonRelease-3 event and not destination.

Am i missing something and how can it be solved ?

Thanks in advance
Philip

Help. Tracking ButtonRelease events [ In reply to ]

never at mail

Aug 7, 1999, 9:00 AM

Post #2 of 3 (392 views)

Permalink

This is not a direct answer, but hopefully it is a help.
I am working on a bit similar program and I have put out some code.
http://www.nexus.hu/hever/prog/vu/visualut.py <=main program
http://www.nexus.hu/hever/prog/vu/frameobj.py <= module
http://www.nexus.hu/hever/prog/vu/vu.gif <= help, a picture of the
program
It grew out from the same script(s) you mentioned, there are same problems
you have now that I had to solve somehow.
In the frameobj.py module there is a "class Connecting_Objects:" which does
that. I maintain an ordered taglist for additional information.

Zsolt

----------
> From: Philip Derbeko <sphilip@techst02.technion.ac.il>
> To: python-list@python.org
> Subject: Help. Tracking ButtonRelease events
> Date: 1999. augusztus 7. 14:09
>
> Hello.
>
> I'm writing an application part of which is a GUI to draw graphs.
> What i want is create verticies and edges between them,
> i create vertex by clicking on Button 1 ( taken from Demo/Tkinter/matt
> scripts )
> and edge created by clicking on Button 3 and dragging the mouse to the
> destination vertex.
> In order to do it every vertex binded events ButtonPress-3 and
> ButtonRelease-3 ,
> the problem i run into is that when i press button 3 and drag it to the
> destination vertex,
> source vertex gets the ButtonRelease-3 event and not destination.
>
> Am i missing something and how can it be solved ?
>
> Thanks in advance
> Philip
>
>
>
> --
> http://www.python.org/mailman/listinfo/python-list

Help. Tracking ButtonRelease events [ In reply to ]

sphilip at t2

Aug 7, 1999, 12:38 PM

Post #3 of 3 (397 views)

Permalink

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Hello.

Thanks for your help.

Actually I wanted to reduce the complexity of this to O(1) , since search is
O(log N).
Well I've found another way of doing it , in the cost of changing a GUI a bit
:
now if you want to draw an edge you click on the source vertex ( regular click
with release)
move pointer to the destination , pointer followed by the edge , and click on
it.
This is the same model as in XFig for example.
I've done it by tracking enter and leave events for each vertex , this way i
know when and which vertex entered
and if button was clicked in it.
I'm sorry i can't post the code , its in very early development stage ,
if you want it anyway email me.

Regards
Philip

Hever Zsolt wrote:

> This is not a direct answer, but hopefully it is a help.
> I am working on a bit similar program and I have put out some code.
> http://www.nexus.hu/hever/prog/vu/visualut.py <=main program
> http://www.nexus.hu/hever/prog/vu/frameobj.py <= module
> http://www.nexus.hu/hever/prog/vu/vu.gif <= help, a picture of the
> program
> It grew out from the same script(s) you mentioned, there are same problems
> you have now that I had to solve somehow.
> In the frameobj.py module there is a "class Connecting_Objects:" which does
> that. I maintain an ordered taglist for additional information.
>
> Zsolt
>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
Hello.
Thanks for your help.
Actually I wanted to reduce the complexity of this to O(1) , since search
is O(log N).
 Well I've found another way of doing it , in the cost of changing a
GUI a bit :
 now if you want to draw an edge you click on the source vertex ( regular
click with release)
 move pointer to the destination , pointer followed by the edge , and
click on it.
 This is the same model as in XFig for example.
 I've done it by tracking enter and leave events for each vertex , this
way i know when and which vertex entered
 and if button was clicked in it.
 I'm sorry i can't post the code , its in very early development stage
,
 if you want it anyway email me.
Regards
 Philip
Hever Zsolt wrote:
<BLOCKQUOTE TYPE=CITE>This is not  a direct answer, but hopefully
it is a help.
 I am working on a bit similar program and I have put out some code.
 <A HREF="http://www.nexus.hu/hever/prog/vu/visualut.py">http://www.nexus.hu/hever/prog/vu/visualut.py</A>
<=main program
 <A HREF="http://www.nexus.hu/hever/prog/vu/frameobj.py">http://www.nexus.hu/hever/prog/vu/frameobj.py</A>
<= module
 <A HREF="http://www.nexus.hu/hever/prog/vu/vu.gif">http://www.nexus.hu/hever/prog/vu/vu.gif</A>   
<= help, a picture of the
 program
 It grew out from the same script(s) you mentioned, there are same problems
 you have now that I had to solve somehow.
 In the frameobj.py module there is a "class Connecting_Objects:" which
does
 that. I maintain an ordered taglist for additional information.
Zsolt
 <A HREF="http://www.python.org/mailman/listinfo/python-list"></A> </BLOCKQUOTE>
</HTML>

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