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Undo: remember deleted trip in UndoRemoveDivesFromTrip::undo()

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If the last dive of a trip is removed, the trip is deleted.
On redo the dive is added to a non existing trip, leading to a
segfault.

Therefore, keep a copy of the trip to reinstate it on redo.
Note: this cannot work for a sequence of multiple commands.
One would have to rewrite the whole undo-history. Nevertheless,
let's do this as a stop-gap measure.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-07-18 19:31:59 +02:00 • committed by Lubomir I. Ivanov
parent b51e616b6a
commit 325b8bba35
4 changed files with 33 additions and 8 deletions
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26
desktop-widgets/undocommands.cpp
View file

@ -48,13 +48,7 @@ void UndoDeleteDive::redo()
// check for trip - if this is the last dive in the trip
// the trip will get deleted, so we need to remember it as well
if (d->divetrip && d->divetrip->nrdives == 1) {
struct dive_trip *undo_trip = (struct dive_trip *)calloc(1, sizeof(struct dive_trip));
*undo_trip = *d->divetrip;
undo_trip->location = copy_string(d->divetrip->location);
undo_trip->notes = copy_string(d->divetrip->notes);
undo_trip->nrdives = 0;
undo_trip->next = NULL;
undo_trip->dives = NULL;
dive_trip *undo_trip = clone_empty_trip(d->divetrip);
// update all the dives who were in this trip to point to the copy of the
// trip that we are about to delete implicitly when deleting its last dive below
Q_FOREACH(struct dive *inner_dive, newList) {
@ -141,10 +135,15 @@ UndoRemoveDivesFromTrip::UndoRemoveDivesFromTrip(QMap<dive *, dive_trip *> remov
void UndoRemoveDivesFromTrip::undo()
{
// first bring back the trip(s)
Q_FOREACH(struct dive_trip *trip, tripList)
insert_trip(&trip);
tripList.clear();
QMapIterator<dive*, dive_trip*> i(divesToUndo);
while (i.hasNext()) {
i.next();
add_dive_to_trip(i.key (), i.value());
add_dive_to_trip(i.key(), i.value());
}
mark_divelist_changed(true);
MainWindow::instance()->refreshDisplay();
@ -155,6 +154,17 @@ void UndoRemoveDivesFromTrip::redo()
QMapIterator<dive*, dive_trip*> i(divesToUndo);
while (i.hasNext()) {
i.next();
// If the trip will be deleted, remember it so that we can restore it later.
dive_trip *trip = i.value();
if (trip->nrdives == 1) {
dive_trip *cloned_trip = clone_empty_trip(trip);
tripList.append(cloned_trip);
// Rewrite the dive list, such that the dives will be added to the resurrected trip.
for (dive_trip *&old_trip: divesToUndo) {
if (old_trip == trip)
old_trip = cloned_trip;
}
}
remove_dive_from_trip(i.key(), false);
}
mark_divelist_changed(true);