Re: Converting signal code from RubyGTK to Gtkmm

[Damianos Mylonakis <danmylonakis gmail com>]

 Hello,

I am new to gtkmm too, and i understand how you feel with documentation, 
but i am used to it now, its not so bad. My only reference is the API eg 
http://library.gnome.org/devel/gtkmm/unstable/namespaceGtk.html for Gtk.

I haven't done what you need to accomplish but i looked up Gtk::Image ( 
http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1Image.html ).
There is no signal function, so you check up the parent classes. I 
thought of Gtk::Widget because it has very many "general" signals for 
widgets, and i found signal_expose_event ( 
http://library.gnome.org/devel/gtkmm/unstable/classGtk_1_1Widget.html#a9c49fed7d291d08f057bdb38ddeafab3 
).

About the dimensions i guess you can check Gtk::Image and Gdk::Pixbuf 
class references.

If you make yourself comfortable with the reference-style documentation 
you wont need help, unless you do some complicated things.

Danny.

On 07/10/2010 05:39 AM, Jason Grimes wrote:
> Hi everyone,
>
> Just a caveat before I continue, I'm new to C++ so I'm jumping in with both
> feet by adding in Gtkmm.  :)  I have a Ruby application that uses GTK to
> display an image being generated via OpenCL, so I created an expose_event
> signal to handle the image update redraw.  I'm having all sorts of problems
> finding good documentation/tutorials on Gtkmm signals or even documentation
> on the gtk::image widget.  I'm also using Glade and builder to construct the
> interface. Here is the Ruby code I'm using that I would like to convert to
> Gtkmm:
>
> $image.signal_connect('expose_event') do
>      if $rgb == nil || $rgb.length != $iwidth*$iheight*3
>          puts 'rgb buffer is null or wrong length'
>      else
>          Gdk::RGB.draw_rgb_image($image.window,
> $image.style.fg_gc($image.state),
>              0, 0, $iwidth, $iheight,
>              Gdk::RGB::Dither::NORMAL, $rgb, $iwidth*3, 0, 0)
>      end
> end
>
> $image is the image widget that is from the builder object.
> $rgb is the 8-bit rgb image.
> $iwidth and $iheight is the image dimensions.
>
> Any help or links to some documentation would be great.  I thought that
> RubyGTK documentation was bad, Gtkmm is so much worse. :(
>
> Jason