[Sugar-devel] Cannot write a function definition for a copy button.

[Iain Brown Douglas]

Thanks, Sebastian,

for a very helpful and tactful reply.

All the errors I failed to understand are from WebKitGtk.

Thanks,

Iain

On Sun, 2015-04-19 at 09:31 -0500, Sebastian Silva wrote:
> 
> On 19/04/15 05:10, Iain Brown Douglas wrote:
> 
> > Following a month of Learn Python the Hard Way, I cannot get an Edit
> > Toolbar to behave fully correctly, in Activity Help, as modified for
> > SoaS Loader.
> Keep it up! This is exactly the way to learn and have fun.
> It might be a good idea to also keep in mind that you are learning two
> things at the same time: Python and GTK.
> > I have tried (in various permutations) to make use of code borrowed from
> > Terminal, Pippy, Develop, Browse, ReadETexts, and Write. I get stuck
> > just writing a "vanilla" function definition for
> > 
> > `__copy_cb`
> > 
> > as in: `edit_toolbar.copy.connect('clicked', self.__copy_cb)` .
> > 
> > What am I missing?
> > 
> > This "fresh start" approach seems to demonstrate a "most naive" form of
> > my error.
> > 
> > I take Help-19 as my base (working with sugar-runner, on Fedora 20).
> > 
> > I edit helpactivity.py adding 5 segments [1] of code I borrowed from
> > Terminal and Pippy.
> The third segment has a commented line in [2] (line 192), but not in
> [1].
> This is the line where the object text_buffer is created in the
> original code.
> Since in line 194, the code tries to access a method of this object,
> it will fail because at this point in the code, text_buffer is None.
> This will stop execution of the code and thus the hotkey does nothing.
> > 
> > The resulting modified helpactivity.py is [2].
> > 
> > For this example, no further debugging or "improvements".
> > 
> > The Activity runs, and looks ok, the copy button works to the extent
> > that the selected text can be pasted with the centre mouse button, but
> > not with a Sugar Paste button (or Ctrl+Shift+V). When I press the "new"
> > Copy button, no clipping shows in the Frame.
> > 
> > The Debug error is:
> > 
> > File "~/Activities/SugarTutorial.activity/helpactivity.py", line 194, in
> > __copy_cb
> >     text_buffer.copy_clipboard(clipboard)
> > AttributeError: 'NoneType' object has no attribute 'copy_clipboard'
> You need to find out what text_buffer is supposed to be. 
> My guess is that you need to ask your Webkit.WebView object
> (instantiated as self._web_view in your code), what text is selected
> (and put that into text_buffer).
> It is always good to have docs at hand, and also Q&A websites are good
> for these kinds of details.
> Here's a relevant question answered, and it seems Webkit is a little
> quirky:
> http://stackoverflow.com/questions/14823892/whats-the-method-to-get-the-webkit-webviews-currently-selected-text
> > 
> > I guess I am missing something very obvious, grateful if anyone could
> > throw me a clue.
> > 
> > With thanks,
> Good luck!
> > Iain
> > 
> > [1] http://fpaste.org/212778/
> > [2] http://ur1.ca/k7fir
> > 
> > 
> > _______________________________________________
> > Sugar-devel mailing list
> > Sugar-devel at lists.sugarlabs.org
> > http://lists.sugarlabs.org/listinfo/sugar-devel
> 
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