Re: [Pango] Calls to Pango::Layout without effect

[Bob Caryl <bob fis-cal com>]

Matthias Kaeppler wrote:

> Hi there,
>
> I have been trying for hours now, but I can't figure out how to use a 
> Pango::Layout to ellipsize a long-winded filename. I looked at the 
> Nautilus source code, and tried to reproduce each step using the 
> pangomm equivalents, but still, no luck.
>
> I am trying to do this in a dialog. Here is my code so far:
>
> TransferOverwriteDialog::TransferOverwriteDialog(const Glib::ustring& 
> filename)
>     : Gtk::MessageDialog(
>     MainWindow::instance(),
>     "foo", // overwritten in body
>     true, // use markup
>     Gtk::MESSAGE_QUESTION,
>     Gtk::BUTTONS_NONE,
>     true), // modal
>       check_button_(LABEL_REMEMBER_CHOICE),
>       remember_choice_(false)
> {
>     using sigc::mem_fun;
>     using namespace Pango;
>
>     typedef Glib::RefPtr<Context> PangoContextPtr;
>     typedef Glib::RefPtr<Layout>  PangoLayoutPtr;
>
>     PangoContextPtr pango_context = get_pango_context();
>     PangoLayoutPtr  pango_layout  = create_pango_layout(filename);
>
>     pango_layout->set_single_paragraph_mode();
>     pango_layout->set_ellipsize(ELLIPSIZE_END);
>
>     Glib::ustring header_text =
>     DIALOG_HEADER_XFER_OVERWRITE + pango_layout->get_text();
>
>     set_markup(header_text);
>     set_secondary_text(DIALOG_BODY_XFER_OVERWRITE);
>
>     // <snip irrelevant stuff>
> }
>
> The text in the 'filename'-object will not get ellipsized, but just 
> printed as is. I noticed that /nothing/ I apply to the layout text 
> will get recognized. For example, I tried to replace 'filename' with 
> some custom marked-up text, i.e. "<i>this is some italic test 
> text</i>" and tried to render that, but again, the text is displayed 
> as plain text (no italics).
>
> On top of that, calls to set_width() seem to be ignored, too. 
> Regardless what I set there, it has no effect whatsoever.
>
> It looks as if every call I make to pango_layout doesn't have any 
> effect. Any ideas what is wrong with my code?
>
> Thanks in advance,
> Matthias Kaeppler
>
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Hey Matt:

I may be all wet here, but because the MessageDialog displays a lot of 
things such as a graphic indicating the type of MessageDialog, a 
separator bar graphic, a couple of buttons (at least) along with the 
message it displays, I'd say that the pango context (which you don't 
seem to be using) you're getting is *not* for the child widget that 
displays the message in the MessageDialog window.  I'd also say that get 
a pango layout pointer you are creating using the Glib::ustring that 
you're passing to the constructor function is not going to affect the 
way the MessageDialog ultimately displays it.  I believe that there is a 
child widget that displays that text, and it will probably have its own 
pango layout; hence, maybe you could somehow use 
Gtk::Container::get_children() and parse that list to find the GtkLabel 
that is ultimately displaying the message.  Again, I'm guessing based on 
my cursory perusal of the MessageDialog header and source files for 
gtkmm-2.6.2.

Oh yeah, the Gtk::MessageDialog::set_secondary_text method has a second 
parameter that defaults to turning the use of markup text off.

Bob Caryl