Add UndoCommand Feature #107
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… preparation for undo/redo commands
Shift responsibility of adding state to StateHistory to Commands which alter the address book, instead of the model manager
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What's the syntax to test this? Courtesy of @nickyfoo: Just "undo". It will undo the last change to the AB (by add, delete, edit or clear). |
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Yup, definitely planning to in a future iteration. I mentioned it in a currently unimplemented nextState method in StateHistory |
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Add a StateHistory class to keep track of the states of the address book as it changes, and an UndoCommand to make use of this.
Fixes #101.