Environment:      Siren
Superclass:         Siren.EditorModel
Category:         MusicUI-DisplayListViews
Instance variables:   list

An instance of DisplayListEditor is used as the intermediary model for viewing lists.
It handles selection and operation on the list.
It adds itself as a dependent of the list and echoes its change messages (i.e., the update: message says self changed).

Instance Variable:
   list          the 'subject' list model
   selection       the current selection or nil

accessing

displayList
   Answer the receiver's list.

list
   Answer the receiver's list.

list: aList
   Set the receiver's list, removing the dependency to the former list if necessary.

moveSelectionTo: newPoint
   Move the editor's selection to the new point in the list.

initialize-release

release
   Remove the dependency to the list.

editing

doDisplay
   inspect button

doEdit
   edit button

doFile
   file i/o button

doInspect
   Inspect the editor (if shiftDown) or the model.

doZoom
   zoom button

updating

update: anAspect with: anArg from: aModel
   Echo the model's changes, assuming a view is a dependent of the receiver.

MetaClass:         DisplayListEditor class

instance creation

on: model