> 1. The 3 states button. > ----------------------- > > The most important, the most easy to implement is the idea of a button which > can take 3 different states. > > I had this idea because I often have the need of something that I have called > the triboolean logic. > > Which consist of something like a boolean but instead of 0 or 1 as possible > values you get 3 values: > > -1, 0 and 1. > > It's of course easy to create this type with **typedef**: > > https://github.com/mrcyberfighter/mk-project/blob/master/mk-project-1.0.0/data/templates/C_Project/headers/tribool.h > > But gtk+ don't have this kind of widget and I never try to D.I.Y a widget > with gtk+. > > ASCII Image of a 3 state button: > ++++++++++++++++++++++++++++++++ > > ``` > > +-----+-----+-----+ > | - | 0 | + | > +-----+-----+-----+ > > ```
You can create you own class and implement something quite similar yourself. I suggest you to look at the "history action" buttons of the recent versions of evince. By using the correct style context GTK_STYLE_CLASS_LINKED <https://developer.gnome.org/gtk3/stable/GtkStyleContext.htm>, the go-forward/go-back buttons are fused in one block and they look slick. Look at the source code, it's quite simple to read : https://git.gnome.org/browse/evince/tree/shell/ev-history-action.c, https://git.gnome.org/browse/evince/tree/shell/ev-history-action.h Then, it's only a matter of using three toggle buttons instead of two push buttons, and correctly handling the states between themselves. ----------------------------------------------------- https://www.mail.be _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
