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Undo: return number of changed dives from undo commands

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To enable a "multiple dives edited" message, return the number
of edited dives from dive edit undo commands. Since there are
two kinds of these commands, viz. normal fields and tag fields,
and the former use templates, create a common base class that
can return the number of dives. Yes, the class hierarchy is
getting scarily deep! At least, this gives a tiny bit of
code-reuse.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2019-05-23 20:27:19 +02:00 • committed by Dirk Hohndel
parent 1641147e7b
commit 03d5e641e1
5 changed files with 87 additions and 67 deletions
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6
desktop-widgets/command_base.h
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@ -166,9 +166,9 @@ public:
virtual bool workToBeDone() = 0;
};
// Put a command on the undoStack, but test whether there is something to be done
// beforehand by calling the workToBeDone() function. If nothing is to be done,
// the command will be deleted.
// Put a command on the undoStack (and take ownership), but test whether there
// is something to be done beforehand by calling the workToBeDone() function.
// If nothing is to be done, the command will be deleted.
void execute(Base *cmd);
} // namespace Command