Re: button background color in gtk3

[Carlos Pereira <jose carlos pereira ist utl pt>]

Quite often widget colors are just a question of style but sometimes 
this is not the case. I can think of medical applications, for example, 
where colors can be critical.

In my case, I have a chemical periodic table made with GTK buttons, each 
one representing a chemical element, with its default color. Users can 
change these chemical element default colors directly from the interface 
or from XML config files:

http://www.gamgi.org/screenshots/screenshot13_5.html

Rewritting an entire CSS file and downloading it everytime users change 
the default color of a chemical element looks really depressing... I am 
sure button colors can be changed directly from the code in GTK 3??

Carlos
> On Sun, August 26, 2012 1:39 pm, Giuseppe Penone wrote:
>    
> > Hi, I faced the same problem some time ago in gtkmm3.
> > I asked a question and then replied myself in this post:
> > http://stackoverflow.com/questions/8952679/gtkmm-3-button-background-color-change
> > You have to use a CSS file (a working example in my code) and import from
> > code
> > to override the gtk3 theme that you are using on your distribution.
> > Cheers,
> > Giuseppe.
> >
> >      
> I had a similar problem and it seems that even with Priority = Application
> the default theme is overriding "override_background_color()". I would
> like to know if this is a bug as I wasted several hours trying to find the
> work around and ended up having to use the css method with the applicable
> config from the default theme which seems a little excessive when a 1
> liner in code should be possible.
>
>
>    
> > On Sun, Aug 26, 2012 at 1:44 PM, Rudra Banerjee
> > <bnrj rudra yahoo com>wrote:
> >
> >      
> > > I will be grateful if someone please show me the way.
> > > On Sun, 2012-08-26 at 00:20 +0100, Rudra Banerjee wrote:
> > >        
> > > > Friends,
> > > > I am putting gtkbuttons inside a grid with modify_bg. I am getting an
> > > > odd case that when the window is focused, all buttons are showing
> > > >          
> > > white,
> > >        
> > > > not what suggested by modify_bg. The same structure was working fine
> > > >          
> > > in
> > >        
> > > > gtk2 (while I was using table instead of grid).
> > > > I am posting the complete minimal code(60 line only) for your
> > > >          
> > > reference.
> > >        
> > > > I have seen that the gtk_widget_modify_bg is deprecated in gtk 3 so I
> > > > tried the suggested method with gtk_widget_override_background_color
> > > >          
> > > but
> > >        
> > > > there it seems that declaration of GdkColor colorRed2 = {0x0000,
> > > >          
> > > 65535,
> > >        
> > > > 29555, 24158} has changed to something like GdkRGBA.
> > > > I tried to change to
> > > >
> > > > GdkRGBA colorRed = {1,0,0,1};
> > > > yeilding error:
> > > >
> > > > ‘const struct GdkRGBA *’ but argument is of type ‘GdkRGBA’
> > > >
> > > > Please Help.
> > > > here is the complete code:
> > > >
> > > > #include<gtk/gtk.h>
> > > > int main(int argc,
> > > >          char *argv[]) {
> > > >      GtkWidget *window;
> > > >      GtkWidget *grid;
> > > >      GtkWidget *menubar;
> > > >      GtkWidget *filemenu;
> > > >      GtkWidget *quit;
> > > >      GtkAccelGroup *accel_group = NULL;
> > > >
> > > >      gtk_init(&argc,&argv);
> > > >      window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> > > >      gtk_window_set_title(GTK_WINDOW(window), "Try Grid");
> > > >      gtk_container_set_border_width(GTK_CONTAINER(window), 05);
> > > >
> > > >      grid = gtk_grid_new();
> > > >      gtk_container_add(GTK_CONTAINER(window), grid);
> > > >   gtk_grid_set_column_homogeneous(GTK_GRID(grid),TRUE);
> > > >   gtk_grid_set_row_homogeneous(GTK_GRID(grid),TRUE);
> > > >      menubar = gtk_menu_bar_new();
> > > >      filemenu = gtk_menu_new();
> > > >
> > > >      accel_group = gtk_accel_group_new();
> > > >      gtk_window_add_accel_group(GTK_WINDOW(window), accel_group);
> > > >
> > > >      GtkWidget *file = gtk_menu_item_new_with_mnemonic("_File");
> > > >      quit = gtk_image_menu_item_new_from_stock(GTK_STOCK_QUIT,
> > > > accel_group);
> > > >
> > > >      gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
> > > >      gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
> > > >      gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);
> > > >
> > > >      g_signal_connect(G_OBJECT(quit), "activate",
> > > > G_CALLBACK(gtk_main_quit), NULL);
> > > >
> > > >      gtk_grid_attach(GTK_GRID(grid), menubar, 0, 0, 2, 1);
> > > >
> > > >
> > > >      /* Color Scheme */
> > > >      GdkColor colorRed2 = {0x0000, 65535, 29555, 24158};
> > > >      GdkColor colorBlue = {0x0000, 3598, 57054, 61937};
> > > >      GdkColor colorWht = {0x0000, 65535, 65535, 65535};
> > > >
> > > >
> > > >      GtkWidget *Abutton = gtk_button_new_with_label("A");
> > > >      gtk_grid_attach(GTK_GRID(grid), Abutton, 0, 1, 1, 1);
> > > >      gtk_widget_modify_bg(Abutton, GTK_STATE_NORMAL,&colorBlue);
> > > >      gtk_widget_modify_bg(Abutton, GTK_STATE_PRELIGHT,&colorWht);
> > > >
> > > >      /* Create second button */
> > > >      GtkWidget *Bbutton = gtk_button_new_with_label("B");
> > > >      gtk_grid_attach(GTK_GRID(grid), Bbutton, 10, 1, 1, 1);
> > > >      gtk_widget_modify_bg(Bbutton, GTK_STATE_NORMAL,&colorRed2);
> > > >      gtk_widget_modify_bg(Bbutton, GTK_STATE_PRELIGHT,&colorWht);
> > > >
> > > >
> > > >      gtk_widget_show_all(window);
> > > >      gtk_main();
> > > >
> > > >      return 0;
> > > > }
> > > >
> > > >
> > > > _______________________________________________
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> > > >          
> > >
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> > >
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> >
> >      
>
> --
> Patrick Shirkey
> Boost Hardware Ltd
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