undo: implement renaming of events

There is a slight complexity here owing to the fact that the profile
works on a copy of the current dive: We get a copy of the event and
have to search for the original event in the current dive. This
could be done in the undo command. Nevertheless, here we do it in
the profile so that when in the future the profile can work on a
non-copied dive we can simply remove this function.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

commands/command_event.cpp

@@ -70,4 +70,31 @@ AddEventSetpointChange::AddEventSetpointChange(struct dive *d, int dcNr, int sec
 	setText(tr("Add set point change")); // TODO: format pO2 value in bar or psi.
 }
 
+RenameEvent::RenameEvent(struct dive *d, int dcNr, struct event *ev, const char *name) : EventBase(d, dcNr),
+	eventToAdd(clone_event_rename(ev, name)),
+	eventToRemove(ev)
+{
+	setText(tr("Rename bookmark to %1").arg(name));
+}
+
+bool RenameEvent::workToBeDone()
+{
+	return true;
+}
+
+void RenameEvent::redoit()
+{
+	struct divecomputer *dc = get_dive_dc(d, dcNr);
+	swap_event(dc, eventToRemove, eventToAdd.get());
+	event *tmp = eventToRemove;
+	eventToRemove = eventToAdd.release();
+	eventToAdd.reset(tmp);
+}
+
+void RenameEvent::undoit()
+{
+	// Undo and redo do the same thing - they simply swap events
+	redoit();
+}
+
 } // namespace Command