Class text item can
represent a text_item<-value_set
or do completion on the basis of their associated text_item<-type.
In both cases, visualisation by means of a combo box
provides useful feedback to the user as well as a commonly found user
interface style.
text_item<-style
combo_box is automatically selected after text_item->value_set
or
text_item->type
with a suitable type. It may be switched afterwards.
A text item showing as a combo-box both supports completion and
opening the combo-box.
Style stepper shows a small up/down arrow at the right
of the text-entry-field. Pressing this field invokes text_item->increment
and
text_item->decrement,
holding the mouse-button down repeats this message. This style is used
by class int_item.
Applications may use it to implement -for example- an ordinal scale.
