Re: How to change GTK+3 label color dynamically

[Rúben Rodrigues <ruben_gr live com pt>]

I get this error:

gtk-CRITICAL **: gtk_style_context_add_provider_for_screen: assertion 
'GDK_IS_SCREEN (screen)' failed

COde: 
gtk_style_context_add_provider_for_screen(gtk_widget_get_style_context(GTK_WIDGET(gtk_builder_get_object(builder,"window_Main"))),
             GTK_STYLE_PROVIDER (css_provider),
             G_MAXUINT);

On 16-03-2017 13:19, Tilo Villwock wrote:
> Am Donnerstag, den 16.03.2017, 12:49 +0000 schrieb Rúben Rodrigues:
> > I provide my code in previous emails.
> >
> > This is my code now:
> >
> > if(css_provider == NULL){
> >           css_provider = gtk_css_provider_new();
> >
> >           gtk_style_context_add_provider
> > (gtk_widget_get_style_context(GTK_WIDGET(gtk_builder_get_object(build
> > er,"window_Main"))),
> >                   GTK_STYLE_PROVIDER (css_provider),
> >                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
> >           g_object_unref(css_provider);
> >
> >       }
> >       gtk_css_provider_load_from_data (css_provider,"#label_Sensors {
> > color: red; }",-1,NULL);
> My apologies. You are right. I missed the earlier one. However, quoting
> the documentation for gtk_style_context_add_provider:
>
> "Note that a style provider added by this function only affects the
> style of the widget to which context belongs. If you want to affect the
> style of all widgets, use gtk_style_context_add_provider_for_screen()."
>
> I'm guessing `window_Main` is a window? So either you attach the
> provider to all the labels you want to change or you use
> gtk_style_context_add_provider_for_screen.
>
> Hope that helps.
>
> --Tilo