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Dive trip model: send changed signals if visibility changed in trips

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To avoid having to do full filter reloads, send dive-changed signals
for dives in trips when the shown-status changed. But only for trips
where not all dives are hidden. Because for those, the plan is to
hide the trip as a whole.

Implement the signal sending in its own function so that it can be
reused for top-level items and the list-view.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2019-11-19 21:40:03 +01:00 • committed by bstoeger
parent 3cc6576913
commit 4ca65894c8
2 changed files with 38 additions and 4 deletions
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38
qt-models/divetripmodel.cpp
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@ -691,14 +691,43 @@ dive *DiveTripModelTree::diveOrNull(const QModelIndex &index) const
return tripOrDive(index).dive;
}
static bool calculateFilterForTrip(const std::vector<dive *> &dives, const DiveFilter *filter)
// Send data changed signals blockwise. Which entries are changed is collected
// in the first parameter "changed".
void DiveTripModelBase::sendShownChangedSignals(const std::vector<char> &changed, quintptr parentIndex)
{
static const QVector<int> roles { SHOWN_ROLE };
for (size_t i = 0; i < changed.size(); ++i) {
// Find first and last block of changed items
if (!changed[i])
continue;
size_t j;
for (j = i + 1; j < changed.size() && changed[j]; ++j)
; // Pass
dataChanged(createIndex(i, 0, parentIndex), createIndex(j - 1, 0, parentIndex), roles);
i = j - 1;
}
}
// Applying the filter to trip-items is a bit tricky:
// We only want to send changed-signals if one of the dives remains visible.
// Because if no dive remains visible, we'll simply send a signal on the parent trip,
// which will then be hidden and all the dives will be hidden implicitly as well.
// Thus, do this in two passes: collect changed dives and only if any dive is visible,
// send the signals.
bool DiveTripModelTree::calculateFilterForTrip(const std::vector<dive *> &dives, const DiveFilter *filter, int parentIndex)
{
bool showTrip = false;
std::vector<char> changed;
changed.reserve(dives.size());
for (dive *d: dives) {
bool shown = filter->showDive(d);
filter_dive(d, shown);
changed.push_back(filter_dive(d, shown));
showTrip |= shown;
}
// If any dive is shown, send changed-signals
if (showTrip)
sendShownChangedSignals(changed, parentIndex);
return showTrip;
}
@ -714,14 +743,15 @@ void DiveTripModelTree::recalculateFilter()
// as a consequence of the filterReset signal right after the local scope.
auto marker = diveListNotifier.enterCommand();
DiveFilter *filter = DiveFilter::instance();
for (Item &item: items) {
for (size_t i = 0; i < items.size(); ++i) {
Item &item = items[i];
if (item.d_or_t.dive) {
dive *d = item.d_or_t.dive;
item.shown = filter->showDive(item.d_or_t.dive);
filter_dive(d, item.shown);
} else {
// Trips are shown if any of the dives is shown
item.shown = calculateFilterForTrip(item.dives, filter);
item.shown = calculateFilterForTrip(item.dives, filter, i);
}
}
}