Re: How to convert text with GtkTextTag from a GtkTextBuffer to Pango markup

[Tristan Van Berkom <tristan upstairslabs com>]

On Sat, 2014-05-03 at 00:17 -0300, Andrés Fernández wrote:
> Hi! this is my first message to this list. I don't know if is correct to
> ask this in this mailing list or in vala mailing list. I think this I
> more related with Gtk+ than with vala.
>
> I'm writing a gtk app in vala. I'm trying to let the user to format some
> text on a GtkTextView save that text on an sqlite db converted to Pango
> markup, so then I can show it later on a GtkLabel formated.
>
> I have to say that I'm not sure if I understand how all this things
> works. Where I'm stuck is trying to handle the uint8[] data that I get
> from Gtk.TextBuffer.serialize (...).
>
> var serialized = buffer.serialize (buffer,
> buffer.register_serialize_tagset (null), start, end );
>
> Then when I try to convert that unit8[] to string I only get one line
> with this text GTKTEXTBUFFERCONTENTS-0001. Searching a on the web I
> realize that is the header of a XML. But I didn't get how to get tho
> other lines to parse that data to Pango markup.

These links should help you understand:
https://developer.gnome.org/gtk3/unstable/GtkTextBuffer.html#gtk-text-buffer-register-serialize-format
https://developer.gnome.org/gtk3/unstable/GtkTextBuffer.html#gtk-text-buffer-register-serialize-tagset

GtkTextBuffer does not have any feature to serialize into pango markup
format, I suppose it would be possible to create such a serialization
but it would probably be lossy (I'm not sure pango markup can express
everything that can be expressed with GtkTextTags in a GtkTextBuffer,
notably transparency in text foreground/background colors).

The above two links should give you the means to serialize into an
internal GTK+ format which can later be used to deserialize it into
another GtkTextBuffer.

Cheers,
    -Tristan

> I hope I made my issue clear. My English is quiet limited.
>
> Best regards!
>
> ------------------------
> Andres Fernandez
> Software Peronista
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