[pygtk] Difficulty with rich text in gtk.TextView

[John Finlay]

Dennis Honeyman wrote:
> Hi everyone.  I've been working on a simple rich text component for a
> project I've been working on using a gtk.TextView, and while I have
> something that's usable (in a very loose sense of the word =), there
> are a couple of problems I'm having that I can't figure out how to
> solve.  This is what I have so far...
>
> http://pastebin.com/m6d3eb0b9
> (The toggle buttons and text view are part of a glade file)
>
> For one, if there isn't text selected and the bold, italic, or
> underline button is pressed, I tried to apply the tag
> (buffer.apply_tag_by_name) by using the cursor's position as the start
> and end gtk.TextIter, although it seems to do nothing, as any text I
> type after I apply the tag is still in the same font as before.
>
> Also, when I have the cursor at the last character of a section of
> text with an applied style and I type more text, it doesn't keep the
> formatting like word processors do.
>
> (If text in underscores is bold)
> _This is bold te_
> (But if I keep typing, the formatting isn't kept)
> _This is bold te_xt
> (It should be like this)
> _This is bold text_
>
> I found a rich text demo application in Pygtk while I was searching
> for a solution (http://www.mail-archive.com/pygtk@daa.com.au/msg10283.html),
> but that one has the same limitation as mine. (Tags are not applied to
> text added directly after a section with the tag applied)
>
> And lastly, when the cursor is at the beginning of a block of text
> with an applied style, the gtk.TextIter at the cursor position says
> that the tag for the style is applied, but when I type it shows up in
> the default font
>
> ( '|' is the cursor)
> |_ere is bold text_
> (iter.get_tags() has the bold tag, but when I type something...)
> h_ere is bold text_
> (The tag is not applied)
>
> Why does it say that the bold tag is applied at the cursor if it
> doesn't apply the tag to text typed at that location?
>
> I think I might be missing something fundamental about how tags work... >_<
>
>
> I'm sorry if any of this was unclear.  If anyone could point me in the
> right direction I would be grateful. =)
>
>   
Your application will have to handle the bookkeeping required to manage 
the tags in the TextBuffer. When text is inserted at the cursor your app 
has to catch a signal indicating the text is being inserted and then 
apply the required tags to the inserted text. I think this can be done 
by catching theTextBuffer  "insert-text" signal (using connect_after() 
to make sure the text has already been inserted) and then applying the 
tags to the text in the callback.

John