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Gtk+/Gnome Application Development
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GTK+ provides tooltip functionality; you simply create a GtkTooltips and attach it to a widget. I like to use the following convenience function in my applications:

set_tooltip(GtkWidget* w, const gchar* tip)
  GtkTooltips* t = gtk_tooltips_new();

  gtk_tooltips_set_tip (t, w, tip, NULL);

The GtkTooltips will be destroyed along with the widget. Make your tooltips long rather than short; there's no reason to skimp on the amount of information you provide here. You should get in the habit of calling set_tooltip() every time you create a button or other widget that could benefit from it.

Note that toolbars created from a GnomeUIInfo template will have tooltips installed automatically.

Gtk+/Gnome Application Development
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