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Reverse all the code using the UndoBuffer class so that we can
use the QUndoStack and QUndoCommand classes. These are Qt's own
inbuild undo framework classes, offering a better undo/redo
process.
Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Before the dive is deleted, a copy is made and passed to the
undo buffer. When edit->undo is clicked, this dive is restored
to the dive list.
Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Add a class to handle all undo/redo events. Whenever a user
action affects a dive, an undo command will be created. A list of
these commands will be stored in the UndoBuffer, to allow for
moving forwards/backwards in the list.
Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Add an empty UndoBuffer class. This will be built up on to
implement a working undo/redo mechanism.
Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Grace Karanja