Chapter 13. Commands and Tools
In the prior chapter, we constructed a GEF Editor and added the ability to select graphical elements in the editor. Now we explore adding commands to manipulate those selected elements, where each command encapsulates a single change to the model. EditParts use a collection of EditPolicy instances to specify what commands can be performed on which graphical elements. After a command is executed, it is placed on the command stack so that the user can choose to undo or redo the command at a later time.
13.1 Listening for Model Changes
We do not manipulate the graphical elements directly but rather modify the model and have the EditParts listen for model changes and update the graph accordingly. If a person is removed ...
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