GtkTipsQuery is a label that
displays tooltips. It also has "What's This?"
functionality. You call
gtk_tips_query_start() to switch to "query mode."
In query mode, the cursor is changed to a question
mark; as the mouse moves over widgets in the
application, the
GtkTipsQuery displays their tooltips. GtkTipsQuery emits a "widget_selected" signal if the user
clicks on a widget; you can use this to display more
extensive help for that widget. You might store the
more extensive help as the "private" component of a
GtkTooltip, or you
might use
gtk_object_set_data() to store some kind of
application-specific help information.
