To respond properly to a request to look at a new
resetListBox callback method must communicate with the
list box and with the meter pane. The
resetListBox callback method
communicates with the list box and with the meter pane using names, as
explained in Chapter 35. The contents of the list box is changed,
and the value in the meter is set to
CalorieViewManager method definition instance resetListBox | theFileDialog file | (theFileDialog := FileDialog new) fileSpec: '*.dta'; open. (file := theFileDialog file) notNil ifTrue: [foodList := (Food collectFrom: file). (self paneNamed: 'ListBox') contents: (foodList collect: [:p | p name]). (self paneNamed: 'CalorieMeter') setValue: nil; event: #display].