Is there an easy way of putting a Quit button botton center

kline · **Posted:** Thu Jan 05, 2012 7:10 am

This should be easy but I'm having trouble finding a straightforward answer. I'm tired of having to kill my gtk application and looking for an easy way of putting a Quit button at the center bottom? Is there an easy way ?

Thanks.

errol · **Posted:** Thu Jan 05, 2012 8:24 am

Hi,

Without knowing your current layout of your application I am going to make some assumptions and hopefully you can apply the information to your code. Also I do not know which version of GTK you are using, so I will try to make the information fairly general to apply to versions 2 and 3.

I will assume that you first have a GtkBox with vertical orientation (GTK 3) or GtkVBox (GTK 2) containing the contents of your application. You will need an empty space at the end to place your next object.

http://developer.gnome.org/gtk3/stable/GtkBox.html
http://developer.gnome.org/gtk3/stable/GtkVBox.html

Your next object is GtkButtonBox with horizontal orientation (GTK 3) or GtkHButtonBox (GTK 2), this is to be placed in the last position of the GtkBox/GtkVBox. This controls the layout of the buttons that would be added so what you need is

Code:

gtk_buttonbox_set_layout(GTK_BUTTONBOX(widget), GTK_BUTTONBOX_CENTER);

to set the button to be centred.

http://developer.gnome.org/gtk3/stable/GtkButtonBox.html
http://developer.gnome.org/gtk3/stable/GtkHButtonBox.html

Next you will need to add your button or buttons. Since GtkButtonBox/GtkHButtonBox is derived from GtkContainer you will use the function "gtk_container_add ()" to add you button or buttons.

http://developer.gnome.org/gtk3/stable/GtkContainer.html

Basically what I have described here is the bases of GtkDialog, which if the situation is right could be used instead.

http://developer.gnome.org/gtk3/stable/GtkDialog.html

You could also consider having a menu bar at the top of your applications main window. The menu bar does not need to be big ie. not too many menu items, but you could have a "Quit" menu item which also has a keyboard binding which is normally "CTRL+Q".

kline · **Posted:** Thu Jan 05, 2012 7:25 pm

I have learned that i have gtk2 and/or gtk2+, not gtk3, so i will look for a corresponding site! thanks much.

errol · **Posted:** Thu Jan 05, 2012 7:47 pm

The Documentation for GTK 2 can be found at http://developer.gnome.org/gtk/stable/

In this case there are not too many differences between GTK 2 and GTK 3 only GtkVBox and GtkHButtonBox have been deprecated in GTK 3, but are still available. The widgets you need to look for are GtkVBox, GtkHButtonBox, GtkContainer and possibly GtkDialog if you want a simple way of doing this.

kline · **Posted:** Thu Jan 05, 2012 8:30 pm

thanks for your reply. it looks like i'm in the midst of being caught in the change-over from 2 to 3. --oh well.
i guess that's the price to pay for jumping in to gtk and GUI since 2002!

kline · **Posted:** Thu Jan 05, 2012 9:48 pm

errol wrote:

The Documentation for GTK 2 can be found at http://developer.gnome.org/gtk/stable/

In this case there are not too many differences between GTK 2 and GTK 3 only GtkVBox and GtkHButtonBox have been deprecated in GTK 3, but are still available. The widgets you need to look for are GtkVBox, GtkHButtonBox, GtkContainer and possibly GtkDialog if you want a simple way of doing this.

Here is a file, quir.c, that I modified from one I had in my gtk directory. Is there a way of centering the 'Quit' button?
I think it is enclosed; it has been years since I used phpBB...

Anyway, the last several lines of my speech application are:

Code:

 run = gtk_button_new_from_stock ("Run Text-To-Speech");
   g_signal_connect (run, "clicked", G_CALLBACK (run_button_click_cb), NULL);

   gtk_box_pack_start (GTK_BOX (vbox), run, 0, 0, 0);

   gtk_widget_show_all (window);
   gtk_main ();
   return 0;
}

So I'm not even sure my kwik hack quit code will even display. hm. I don't see quit.c but I did send it....

Thanks either way.

errol · **Posted:** Sat Jan 07, 2012 9:23 am

This will place the button at the end of the GtkVBox, but it will be the width of the GtkVBox. If that is fine all is OK

If you need the button to be button sized then I would suggest containing your button in a GtkHButtonBox setting the options to place the buttons centre, then add that to your GtkVBox. This way if you need extra buttons to match the layout it is a simple case of adding them to the GtkHButtonBox.

kline · **Posted:** Sat Jan 07, 2012 10:09 pm

Well, I figured it out myself the best way I knew how: I just stuck a vertical quit button in to main() function:

Code:

entry = gtk_entry_new_with_max_length (50);
   gtk_signal_connect (GTK_OBJECT (entry), "activate",
                       GTK_SIGNAL_FUNC (enter_callback), entry);

   hbox = gtk_hbox_new (FALSE, 0);
   gtk_container_add (GTK_CONTAINER (vbox), hbox);
   gtk_widget_show (hbox);

   button = gtk_button_new_with_label ("Quit");
   gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
                              GTK_SIGNAL_FUNC (gtk_exit),
                              GTK_OBJECT (window));
   gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
   GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
   gtk_widget_grab_default (button);

The "enter_callback()" fn seems to have some surplus code ... gotta check that.
This works for now, but I would very much appreciate it if anybody could clean up any unnecessary code. I'm learning by actually writing .... even if it means stumbling.

tia people.

errol · **Posted:** Sun Jan 08, 2012 9:33 am

That looks OK apart from you are using a function that was deprecated with the change from GTK 1.2 to 2.0.

Please use g_signal_connect_swapped() instead of gtk_signal_connect_object() and g_signal_connect() instead of gtk_signal_connect().

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