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Re: [orca-list] Programers guide for Orca development

This is a great idea.
happy hacking.
Krishnakant.
On 12/30/2014 05:28 PM, José Vilmar Estácio de Souza wrote:
Just what I was thinking, write some instructions on how to create a simple script. 
My english is very poor but someon can enhance what I write.
What I know about orca is almost nothing, but I think that is enough to get the ball rolling. 
Thanks.


On 12/29/2014 05:58 PM, Krishnakant Mane wrote:

I can help you alex.
I just needed some one to accompany me on this.
I too don't have that much disposable time, but perhaps I can find some more by jan end. 
I will surely like to help in this way.
I can actually then as you say run with the ball.
I know Python and really can do it for sure.
We now have to consider what all we must prioritize and how.
getting started is very important though and perhaps some one might just give us a way to write a "hello world " Orca script or perhaps a little beyond that is more than sufficient. 
I am happy that this is gaining momentum.
happy hacking.
Krishnakant.
On 12/29/2014 11:31 PM, Alex Midence wrote:
My goodness! Thanks, José for posting this. It admirably underscores the desperate need for a concise, complete and well-written developer's guide for Orca. Perhaps it is my own ignorance of matters programming but, I imagine only the very most persistent and dedicated people with a great deal of disposable time are likely to contribute anything substantial to Orca development. This is quite disheartening. I am going to look into Doxygen and see about learning how to run Orca's source code trough it in order to extrapolate the comments from it. I will then post the results of my efforts to the list for someone else more versed in these sorts of things to hopefully pick up the ball and run with it. I will not propose a timetable for this as I am sadly not one of those people with lots of disposable time and I shall have to learn a few things along the way. However, I feel that SOMEONE has to step up and do something about this or community development of enhancements to Orca beyond small modifications or the odd script or two will never go from wish to reality. I think of products like Window Eyes with tens if not hundreds of plugins written by its user community and that's not even an open source project. I can only imagine the amazing things that can be done on something like Orca given the availability of proper developer docs. 

Alex M



-----Original Message-----
From: José Vilmar Estácio de Souza [mailto:vilmar informal com br]
Sent: Monday, December 29, 2014 5:52 AM
To: Krishnakant Mane; luciano de souza; Alex Midence
Cc: orca-list
Subject: Re: [orca-list] Programers guide for Orca development

A small piece from a debug file:

KEYBOARDEVENT: type=0
                  id=65364
                  hw_code=116
                  modifiers=16400
                  event_string=(Down)
                  keyval_name=(Down)
                  is_text=True
                  timestamp=101591371
                  time=1419852915.746248
                  keyType=navigation
                  shouldEcho=False


In this case, a key was pressed, the down key.



----------> QUEUEING OBJECT:TEXT-CARET-MOVED
An event called OBJECT:TEXT-CARET-MOVED was post in orca's queue to be processed. 



vvvvv PROCESS OBJECT EVENT object:text-caret-moved vvvvv
OBJECT EVENT: object:text-caret-moved detail=(4,0,0)
      app.name='gedit' name='None' role='text' state='editable enabled
focusable focused multi line sensitive showing visible' relations=''
Script for event: gedit (module=orca.scripts.apps.gedit.script)
TOTAL PROCESSING TIME: 0.0039
^^^^^ PROCESS OBJECT EVENT object:text-caret-moved ^^^^^

The event was processed.

In the gedit scripts there is a function called onCaretMoved,
responsable to process this event.
      def onCaretMoved(self, event):
"""Callback for object:text-caret-moved accessibility events.""" 


On 12/29/2014 09:26 AM, Krishnakant Mane wrote:

Thans for the suggestion about debug.
Even I will try it tonight.
happy hacking.
Krishnakant.

On 12/29/2014 04:41 PM, José Vilmar Estácio de Souza wrote:

Hi.
Some small tips:
1. try to work with orca from git, not downloaded from a tar package.

In general new implementations are applied in the master version of
orca.

2. Take a look in a debug file produced by orca. All events captured
and processed by orca are present in this debug file. To generate a
debug file run the following command:
orca --replace --debug-file=orca.debug
The command above run orca in debug mode and write all information to
the orca.debug file.
Make a small operation like move the cursor in gedit program and
restart orca.
Now examine the content of orca.debug.





On 12/29/2014 08:36 AM, luciano de souza wrote:

It's perfectly understandable. The quantity of effort to provide a
complete manual is meaningful.
We need to work with the way we have. And this way is the source code.
I have downloaded the source code and I start to navigate in the code. 
My first idea was to take a look in the scripts made for specific
applications.

I have chosen the plugin of Pidgin. I observed all plugins have a
standard "script.py" file. I decided to start from here.

I observed that it's common a class named "Script". Probabily, it's
the class responsible to get the events and fire custom actions
answering from events or key bindings.

I observed also the module pyatspi. Searching in the Google, I
understood this module is the Gnome infrastructure of accessibility.
Yes, I need to study it.
My conclusion is: it's really possible to follow the code and learn by 
means of it. Lots of comments are provided.
But, the problem is: how to run the first "hello world" Orca script? I 
found strange classes like "SpeechGenerator". I don't know what is a
SpeeachGenerator, but it seems that each application has one of it.

Yes, we don't have a manual, but, there are at least a example codes
or at least an instruction from where a beginer can start his or her
study of code?

I am really interested in helping. Is difficult without a
documentation? Certainly. But the worst is not understand by where to 
start. Without any additional word, the dificulty will never be
converted into easiness.

2014-12-29 2:14 GMT-02:00, Alex Midence <alex midence gmail com>:

No such animal. People have asked for it, no one has put one
together, so
everybody has to start reading the actual code. Good luck!

Sent from my iPhone
On Dec 28, 2014, at 8:28 PM, luciano de souza <luchyanus gmail com> 
wrote:

Hello all,
I have been studying Python. As I had already programed in Pascal and 
Lua, it has been a very pleasant and quick task.

The final target is to learn about Orca development, creating
something useful for the comunity.
I know the way is very long. I can imagine the quantity of experience 
required to develop something for Orca is very big.

But I need to start from anywhere. Even though, my knowledge in
Python
is still limited, I would like to read the Orca programer's guide.
The
task is very complex, but perhaps there is some parts of the code is 
not so complex.

I don't know. Exactly now, I am even not sure if I will able to
follow
this target until the success. I simply don't know the size of the
challenge.

I believe that reading the documentation I will feel better what's
the
distance wich separates me to the Orca development.

Said it, I ask: where can I find materials for beginers in Orca
development?

Regards,


--
Luciano de Souza
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