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Date: Tue, 13 Nov 2007 18:06:31 +0100
To: lablgtk at yquem.inria.fr
Subject: Re: [Lablgtk] Predicting width of rendered text
Message-ID: <20071113170631.GA14227 at localhost>
Mail-Followup-To: Julien Moutinho <julien.moutinho at gmail.com>,
	lablgtk@yquem.inria.fr
References: <4739B9D3.3080105 at janestcapital.com>
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In-Reply-To: <4739B9D3.3080105 at janestcapital.com>
From: Julien Moutinho <julien.moutinho at gmail.com>
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On Tue, Nov 13, 2007 at 09:50:59AM -0500, Adam Chlipala wrote:
> [...]
> Can anyone suggest code that would let me measure the pixels needed to 
> render a string in the font that is being used in all of my widgets?

AFAICS there is the (deprecated) Gdk.Font module:
  http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/Gdk.Font.html

And the Pango.Layout GPango.context machinery:
  http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/Pango.Layout.html
  http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/GPango.context.html

% lablgtk2
        Objective Caml version 3.10.1+dev0 (2007-05-21)

# let text = "On l'appelait Margot la ventouse
  Elle avait des yeux de velours." in
  GtkMain.Rc.parse_string "gtk-font-name = \"Sans 8\"";
  let window = GWindow.window () in
  let layout = window#misc#pango_context#create_layout in
  Pango.Layout.set_text layout text;
  Pango.Layout.get_pixel_size layout;;
- : int * int = (131, 20)

HTH,
  Julien.

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