Re: GtkSourceView: code folding

[Sébastien Wilmet <swilmet gnome org>]

On Wed, 2014-08-13 at 17:28 +0200, flix wrote:
> #region My region
> some code here
> #endregion
>
> And when collapsed it should look like:
>
> My region
>
> (well, with a tiny frame around it and a different background and 
> foreground color)
> MonoDevelop does it: that's a proof that Gtk# can make it).

I think MonoDevelop doesn't use GtkTextView anymore, but what you
describe should be feasible with GtkTextView too.

You can apply an invisible tag to "#region " too, besides the two
following lines. You can also apply another GtkTextTag for the styling.

To unfold "My region", you can either have a + button in the gutter, or
handle click events in the GtkTextView to see if the click happens
inside "My region".

> > The default undo manager can be improved to handle correctly non-text 
> > elements. If you really need this, you can file a bug on bugzilla. But 
> > using a GtkTextChildAnchor for the code folding seems like a hack to 
> > me. Especially with a GtkLabel inside it, since it can easily be 
> > replaced by normal text in the GtkTextBuffer.
>
> Yes: that's another solution I was thinking about. Anyway by using 
> buffer->get_text() we get wrong code using normal text in the 
> GtkTextBuffer: that's why TextChildAnchor seems a better solution to me 
> (furthermore I can use: tooltips, on_click events and a different mouse 
> icon on them, but maybe that can be done with custom tags too, I don't 
> know).

Ok, I better understand the reason of using a GtkTextChildAnchor.

> However the main issue to me remains the handling of the undo stack. In 
> either case it contains child anchor characters (gunichar 65532), or 
> extra characters if we use normal text.
>
> That's the part I can't fix.

With the solution described above, you don't need the
GtkTextChildAnchor.