pythoncard-users

[Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Tony C. <cap...@gm...>]

I've printed a list of filenames in a textarea widget.

I want to see how many filenames are in the widget.

When I call GetNumberOfLines() or getNumberOfLines(), they both return 1.

Is there a way to query the widget to actually get the number of items printed ?


thanks

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Phil E. <ph...@li...>]

Tony Cappellini wrote:
> I've printed a list of filenames in a textarea widget.
> 
> I want to see how many filenames are in the widget.
> 
> When I call GetNumberOfLines() or getNumberOfLines(), they both return 1.
> 
> Is there a way to query the widget to actually get the number of items printed ?
> 

If you're using a textarea to store a list, wouldn't it be simpler to 
just use a list widget instead? Then just make a call to 
len(self.components.listName.items) to find out how many are in there.

-- 

Regards

Phil Edwards
Brighton, UK

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Kevin A. <al...@se...>]

On Nov 14, 2007, at 11:20 PM, Tony Cappellini wrote:

> I've printed a list of filenames in a textarea widget.
>
> I want to see how many filenames are in the widget.
>
> When I call GetNumberOfLines() or getNumberOfLines(), they both  
> return 1.
>
> Is there a way to query the widget to actually get the number of  
> items printed ?
>
>
> thanks

self.components.yourComponentNameHere.getNumberOfLines() should work.  
If it doesn't, then I would like to know what the line endings are as  
well as which platform and versions of wxPython and PythonCard you're  
using.

If you end up using a List component instead then getCount() is the  
method you want.

ka

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Tony C. <cap...@gm...>]

I had posted a question a few days ago- regarding Which Text widget to use.
I need a widget with a scroll bar because the list is likely to be
larger that the space for the widget.
I believe the list widget doesn't have a scroll bar, that's why I'm
using the TexArea widget

On Nov 15, 2007 1:25 AM, Phil Edwards <ph...@li...> wrote:
>
> Tony Cappellini wrote:
> > I've printed a list of filenames in a textarea widget.
> >
> > I want to see how many filenames are in the widget.
> >
> > When I call GetNumberOfLines() or getNumberOfLines(), they both return 1.
> >
> > Is there a way to query the widget to actually get the number of items printed ?
> >
>
> If you're using a textarea to store a list, wouldn't it be simpler to
> just use a list widget instead? Then just make a call to
> len(self.components.listName.items) to find out how many are in there.
>
> --
>
> Regards
>
> Phil Edwards
> Brighton, UK
>

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Kevin A. <al...@se...>]

On Nov 15, 2007, at 9:51 AM, Tony Cappellini wrote:

> I had posted a question a few days ago- regarding Which Text widget  
> to use.
> I need a widget with a scroll bar because the list is likely to be
> larger that the space for the widget.
> I believe the list widget doesn't have a scroll bar, that's why I'm
> using the TexArea widget

The scrollbar appears once you have more items in the list than can  
be displayed at one time. That is pretty standard for a list widget.

ka

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Tony C. <cap...@gm...>]

Ok- thanks

I'll reply to your questions- shortly- when I"m in front of the
machine where I found the problem with GetNumberOfLines()

On Nov 15, 2007 11:44 AM, Kevin Altis <al...@se...> wrote:
>
> On Nov 15, 2007, at 9:51 AM, Tony Cappellini wrote:
>
> > I had posted a question a few days ago- regarding Which Text widget
> > to use.
> > I need a widget with a scroll bar because the list is likely to be
> > larger that the space for the widget.
> > I believe the list widget doesn't have a scroll bar, that's why I'm
> > using the TexArea widget
>
> The scrollbar appears once you have more items in the list than can
> be displayed at one time. That is pretty standard for a list widget.
>
> ka
>
>

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Tony C. <cap...@gm...>]

> self.components.yourComponentNameHere.getNumberOfLines() should work.

> If it doesn't, then I would like to know what the line endings are as
> well as which platform and versions of wxPython and PythonCard you're
> using.

The platform is Windows
The line endings are "\n"

Wx version 2.8.4.2
Pythoncard version is the latest 0.8.2


I've just tried this again today- while verifying the line endings,
and getNumberOfLines() is returning a valid number instead of 1

I'll keep watching this to see if it changes

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Kevin A. <al...@se...>]

On Nov 15, 2007, at 1:05 PM, Tony Cappellini wrote:

>> self.components.yourComponentNameHere.getNumberOfLines() should work.
>
>> If it doesn't, then I would like to know what the line endings are as
>> well as which platform and versions of wxPython and PythonCard you're
>> using.
>
> The platform is Windows
> The line endings are "\n"
>
> Wx version 2.8.4.2
> Pythoncard version is the latest 0.8.2
>
>
> I've just tried this again today- while verifying the line endings,
> and getNumberOfLines() is returning a valid number instead of 1
>
> I'll keep watching this to see if it changes

After looking at the documentation again for the wx.TextCtrl  
(TextArea is based on that widget) method GetNumberOfLines, I would  
avoid using it to count lines if you want to be consistent in your  
results across platforms. Here's the excerpt from the docs...

"""
wxTextCtrl::GetNumberOfLines
int GetNumberOfLines() const

Returns the number of lines in the text control buffer.

Remarks

Note that even empty text controls have one line (where the insertion  
point is), so GetNumberOfLines() never returns 0.

For gtk_text (multi-line) controls, the number of lines is calculated  
by actually counting newline characters in the buffer. You may wish  
to avoid using functions that work with line numbers if you are  
working with controls that contain large amounts of text.
"""

In addition I noticed that the result returned on Windows was  
actually the wrapped line count, not the number of newlines. So a  
safer, more consistent result would be to get a count with something  
like...

len(self.components.myTextArea.text.split('\n'))

ka

Re: [Pythoncard-users] Getting the number of lines (entries) in a textarea widget

[Sean K. F. <skf...@gm...>]

I can't help but wonder...

If you are indeed populating the text control with a list of filenames
yourself, why not increment a counter while you build this list and
cache that number off for later reference?  Better yet, why not
populate a list (list object, not list control) and use that for the
basis of the content within text control?  You can then leverage the
full capabilities of the list object and every time it is updated,
simply reference some "redraw" routine to populate the text control
with the current contents of the list?

Personally, I do not recommend relying on the control to return what's
in it, or how many of something it contains, you should begin thinking
about how you can abstract that data out to your code and manage it at
the application level, rather than the view/UI level, and only use the
UI to display the underlying application data... If that makes any
sense...

- Sean

On Nov 15, 2007 4:40 PM, Kevin Altis <al...@se...> wrote:
>
> On Nov 15, 2007, at 1:05 PM, Tony Cappellini wrote:
>
> >> self.components.yourComponentNameHere.getNumberOfLines() should work.
> >
> >> If it doesn't, then I would like to know what the line endings are as
> >> well as which platform and versions of wxPython and PythonCard you're
> >> using.
> >
> > The platform is Windows
> > The line endings are "\n"
> >
> > Wx version 2.8.4.2
> > Pythoncard version is the latest 0.8.2
> >
> >
> > I've just tried this again today- while verifying the line endings,
> > and getNumberOfLines() is returning a valid number instead of 1
> >
> > I'll keep watching this to see if it changes
>
> After looking at the documentation again for the wx.TextCtrl
> (TextArea is based on that widget) method GetNumberOfLines, I would
> avoid using it to count lines if you want to be consistent in your
> results across platforms. Here's the excerpt from the docs...
>
> """
> wxTextCtrl::GetNumberOfLines
> int GetNumberOfLines() const
>
> Returns the number of lines in the text control buffer.
>
> Remarks
>
> Note that even empty text controls have one line (where the insertion
> point is), so GetNumberOfLines() never returns 0.
>
> For gtk_text (multi-line) controls, the number of lines is calculated
> by actually counting newline characters in the buffer. You may wish
> to avoid using functions that work with line numbers if you are
> working with controls that contain large amounts of text.
> """
>
> In addition I noticed that the result returned on Windows was
> actually the wrapped line count, not the number of newlines. So a
> safer, more consistent result would be to get a count with something
> like...
>
> len(self.components.myTextArea.text.split('\n'))
>
> ka
>
>
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-- 
Thanks!
Sean

Sean K. Friese
skf...@gm...

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