Hello,
sorry for the delay and thank your for your answer.
1.) What I do -- I am working on CLI a script
that renders several rectangle objects with corresponding
text strings into the cairo's SVGSurface.
So first, I use cairo to paint some rectangles and then I utilize pango
to add a corresponding text string into the middle of every rectangle.
So, no I dont use widgets. I use cairo (v 1.10.0), Pango (v 1.40.4) and
PangoCairo.
I know that there are some ways to utilize CSS, but
not in Pango (as far as I know).
2.) So it looks like equivalents to functions like "pango_attr_family_new()"
are not available in Python3.
I currently use "Pango.parse_markup()" method for this. I suggest
adding a third column (named something like "Python alternative") into the
"Symbol Mapping" table
(https://lazka.github.io/pgi-docs/Pango-1.0/mapping.html).
So that for the "pango_attr_family_new()" and similar attr functions,
there would be an alternative value "Pango.parse_markup()",
"Pango.Layout.set_markup()"
and "Pango.Layout.set_markup_with_accel()" (or just the first one).
3.) However, the problem with these "markup" functions is that they are not
able to crunch
even a simple unicode string.
This example fails with the Glib.Error for me:
markup_text = "<span foreground=\"#ffffff\">" + "saké" + "</span>"
ret, attrs, text, accel_char = Pango.parse_markup(markup_text,
len(markup_text), "\u0000")
GLib.Error: g-markup-error-quark: Error on line 1 char 48: '/' is not a
valid character following the close element name 'span<'; the allowed character
is '>' (2)
The workaround exists -- I compute the length of my text (len("saké"))
and pass only an ascii version of the string.
Fortunately "Pango.Layout.set_text()" works with an UTF strings.
This bug of course makes "set_markup()" and "set_markup_with_accel()"
methods de facto unusable.
Thanks, S. Vlcek.
On 05/05/2017 06:59 PM, infirit wrote:
> Op 05/05/2017 om 05:32 PM schreef Slavomir Vlcek:
>> 1.) Please could anyone tell me how to replace the c-based function
>> "pango_attr_family_new()"? This is one of many functions
>> that does not seem to have a python equivalent
>> (according to http://lazka.github.io/pgi-docs/#Pango-1.0/mapping.html).
>
> There is an open bug on this [1]. There is however a alternative (better?)
> way to style widgets in Gtk3, it is CSS. I recently modified a script to
> show how it is done, see [2]. If you are not styling widgets please elaborate
> what you are actually trying to do.
>> 2.) By the way when I pass (unitialized) Pango.Attribute() instance
>> to the insert() method, my script ends with SIGFAULT.
>>
>> attrs = Pango.AttrList()
>> attr = Pango.Attribute()
>> attrs.insert(attr)
>>
>> I guess that is not the correct behavior.
>
> Have not used Pango but reading the bug [1] it may be related to it.
>
> ~infirit
>
> [1] https://bugzilla.gnome.org/show_bug.cgi?id=646788
> [2] https://gist.github.com/infirit/cf4f531e03136b641471b079b8370ead
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