4.2 List panels
:single-selectionpanel. On other occasions, they want new selections to be added to the previous ones -- just like a
:extended-selection interaction combines these two interactions. Here is an extended-selection list panel:
(contain (make-instance 'list-panel :items '("Item" "Thing" "Object") :interaction :extended-selection))Before continuing, here are the definitions of a few terms. The action you perform to select a single item is called the selection gesture. The action performed to select additional items is called the extension gesture. There are two extension gestures. To add a single item to the selection, the extension gesture is a click of the left button while holding down the Control key. For selecting a range of items, it is a click of the left button whilst holding down the Shift key.
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