Numeric/Text Data Entry

GtkEntry - a single line text entry field.
GtkEntryCompletion - completion functionality for GtkEntry
GtkHScale - a horizontal slider widget for selecting a value from a range.
GtkVScale - a vertical slider widget for selecting a value from a range.
GtkSpinButton - retrieve an integer or floating-point number from the user.
GtkEditable - Interface for text-editing widgets.