Re: Custom GtkHeaderBar

[cecashon aol com]

 If I use

gtk_style_context_add_class(context, "header");

The background drawn to the event box window is transparent on my computer. I just used "menu" to test a 
different color from the theme but there are many that you can test. The style classes are at the bottom of 
the documentation page.

https://developer.gnome.org/gtk3/stable/GtkStyleContext.html

I painted the main window green so that I could see if the event box window gets drawn to and also to 
distinguish widgets that don't have windows like the GtkLabel, GtkBox and GtkGrid.

Another option is to have a CSS file for the header widget and use that although then you get away from using 
the users theme. I have tried using the deprecated function

gtk_style_context_get_background_color()

to peak at if there is a constant background color set and what it might be but that function isn't going to 
work for a gradient or image so it is only a partial solution for checking the style class background.

Still trying to figure out these things myself.

Eric