When on_draw() signal raised?

when the on_draw() signal generate in gtkmm?

See for C GTK3 API


For other languages it is similar. But note that draw signal is removed from GTK4. For GTK4 GtkDrawingArea we use gtk_drawing_area_set_draw_func() instead. See


Have you made some success for your other questions, about CSS colors and gtkmm DrawingArea? Would be nice if you post some hints to the solution for other people.

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