# Policy for access to widget struct data **URL:** \ **Category:** Ruby-Gnome 2\ **Created:** [July 8, 2007, 4:08pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874 "2007-07-08T16:08:39Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [July 8, 2007, 4:08pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874/1 "2007-07-08T16:08:39Z")
I need access to GtkButton-\>event\_window from my program. I see that it is not binded, but for example GtkWidget-\>window is equivalent problem, and binded. Is there any policy regarding widget struct data? Can I simply add access to -\>event\_window since I need it? – Guillaume C. - [http://zarb.org/~gc/](http://zarb.org/~gc/) * * * This [SF.net](http://SF.net) email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. [http://sourceforge.net/powerbar/db2/](http://sourceforge.net/powerbar/db2/) ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [July 8, 2007, 4:42pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874/2 "2007-07-08T16:42:42Z")
Hi, On Sun, 8 Jul 2007 16:07:48 +0200 “Guillaume C.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I need access to GtkButton-\>event\_window from my program. I see that > it is not binded, but for example GtkWidget-\>window is equivalent > problem, and binded. > > Is there any policy regarding widget struct data? Can I simply add > access to -\>event\_window since I need it? We implement public functions/data of GTK-2.0. “public” means it can be refer from API reference. And we don’t prefer to implement accessors to C Struct data directly. For example, Gtk::Widget-\>window is in the API reference. [http://developer.gnome.org/doc/API/2.0/gtk/GtkWidget.html#GtkWidgetClass](http://developer.gnome.org/doc/API/2.0/gtk/GtkWidget.html#GtkWidgetClass) So we implemented them. Are there any workaround ? If no, you can implement it. – .:% Masao M.[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) * * * This [SF.net](http://SF.net) email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. [http://sourceforge.net/powerbar/db2/](http://sourceforge.net/powerbar/db2/) ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [July 8, 2007, 5:37pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874/3 "2007-07-08T17:37:46Z")
> > Is there any policy regarding widget struct data? Can I simply add > > access to -\>event\_window since I need it? > > We implement public functions/data of GTK-2.0. > “public” means it can be refer from API reference. > And we don’t prefer to implement accessors to C Struct data directly. I see. And there is even this mention about the GtkButton struct: “This should not be accessed directly. Use the accessor functions below.” Though, I was misleaded because in the source code (headers of gtk) there seems to be no difference between struct for GtkWidget and GtkButton. I wonder why they don’t define the GtkButton as an opaque struct in the headers of gtk… > Are there any workaround ? I cannot find one for the moment ☹ I have a set of GtkButtons in a GtkHBox in a GtkScrolledWindow. I want to implement autoscrolling of the scrolled window when a non-visible button is focused with the keyboard. I cannot find another approach than looking at the coordinates of the -\>event\_window GdkWindow (GtkButton doesn’t have its own GdkWindow). But there is maybe a better one… but I don’t know it. – Guillaume C. - [Guillaume Cottenceau](http://zarb.org/~gc/) * * * This [SF.net](http://SF.net) email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. [http://sourceforge.net/powerbar/db2/](http://sourceforge.net/powerbar/db2/) ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [July 8, 2007, 6:10pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874/4 "2007-07-08T18:10:52Z")
Hi, this example is not perfect, but i think you will get it with it. Cheers detlef #!/usr/bin/ruby require ‘gtk2’ win = Gtk::Window.new scroll = Gtk::ScrolledWindow.new box = Gtk::HBox.new win \<\< scroll scroll.add\_with\_viewport box adj = scroll.hadjustment width = 0 10.times do |i| button = Gtk::Button.new(“button #{i}”) width += button.size\_request[0] button.signal\_connect(‘focus\_in\_event’) do |b, event| pos = b.allocation.x p pos adj.value = pos end box.pack\_start button end adj.upper = width win.show\_all Gtk.main Am Sonntag, den 08.07.2007, 17:37 +0200 schrieb Guillaume C.: > to implement autoscrolling of the scrolled window when a non-visible > button is focused with the keyboard. I cannot find another approach > than looking at the coordinates of the -\>event\_window GdkWindow > (GtkButton doesn’t have its own GdkWindow). But there is maybe a > better one… but I don’t know it. * * * This [SF.net](http://SF.net) email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. [http://sourceforge.net/powerbar/db2/](http://sourceforge.net/powerbar/db2/) ---
**Author:** ![blueprint](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/cc9497/32.png) [@blueprint](https://www.ruby-forum.com/u/blueprint)\ **Post date:** [July 8, 2007, 7:19pm UTC](https://www.ruby-forum.com/t/policy-for-access-to-widget-struct-data/108874/5 "2007-07-08T19:19:59Z")
> this example is not perfect, but i think you will get it with it. Doh! I just proved myself to be a gtk newbie 😕 Thanks a lot for your time! – Guillaume C. - [Guillaume Cottenceau](http://zarb.org/~gc/) * * * This [SF.net](http://SF.net) email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. [http://sourceforge.net/powerbar/db2/](http://sourceforge.net/powerbar/db2/)