Undo: update filter flag when dives change

The filter code is strange: it actually only checks the
dive->hidden_by_filter flag. Thus, before propagating the dive
changed signal, this flag has to be updated. Do this in the
DiveTripModel. Ultimately, this should be refactored.

Moreover, if the filter-flag changed notify the frontend
of a changed trip so that the trip is hidden / unhidden.

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

desktop-widgets/command_divesite.cpp

@@ -7,6 +7,7 @@
 #include "core/qthelper.h"
 #include "core/subsurface-string.h"
 #include "qt-models/divelocationmodel.h"
+#include "qt-models/filtermodels.h"
 
 namespace Command {
 
@@ -17,13 +18,16 @@ namespace Command {
 static std::vector<dive_site *> addDiveSites(std::vector<OwningDiveSitePtr> &sites)
 {
 	std::vector<dive_site *> res;
+	std::vector<dive *> changedDives;
 	res.reserve(sites.size());
 
 	for (OwningDiveSitePtr &ds: sites) {
 		// Readd the dives that belonged to this site
 		for (int i = 0; i < ds->dives.nr; ++i) {
 			// TODO: send dive site changed signal
-			ds->dives.dives[i]->dive_site = ds.get();
+			struct dive *d = ds->dives.dives[i];
+			d->dive_site = ds.get();
+			changedDives.push_back(d);
 		}
 
 		// Add dive site to core, but remember a non-owning pointer first.
@@ -32,6 +36,10 @@ static std::vector<dive_site *> addDiveSites(std::vector<OwningDiveSitePtr> &sit
 		emit diveListNotifier.diveSiteAdded(res.back(), idx); // Inform frontend of new dive site.
 	}
 
+	processByTrip(changedDives, [&](dive_trip *trip, const QVector<dive *> &divesInTrip) {
+		emit diveListNotifier.divesChanged(trip, divesInTrip, DiveField::DIVESITE);
+	});
+
 	// Clear vector of unused owning pointers
 	sites.clear();
 
@@ -44,13 +52,15 @@ static std::vector<dive_site *> addDiveSites(std::vector<OwningDiveSitePtr> &sit
 static std::vector<OwningDiveSitePtr> removeDiveSites(std::vector<dive_site *> &sites)
 {
 	std::vector<OwningDiveSitePtr> res;
+	std::vector<dive *> changedDives;
 	res.reserve(sites.size());
 
 	for (dive_site *ds: sites) {
 		// Reset the dive_site field of the affected dives
 		for (int i = 0; i < ds->dives.nr; ++i) {
-			// TODO: send dive site changed signal
+			struct dive *d = ds->dives.dives[i];
-			ds->dives.dives[i]->dive_site = nullptr;
+			d->dive_site = nullptr;
+			changedDives.push_back(d);
 		}
 
 		// Remove dive site from core and take ownership.
@@ -59,6 +69,10 @@ static std::vector<OwningDiveSitePtr> removeDiveSites(std::vector<dive_site *> &
 		emit diveListNotifier.diveSiteDeleted(ds, idx); // Inform frontend of removed dive site.
 	}
 
+	processByTrip(changedDives, [&](dive_trip *trip, const QVector<dive *> &divesInTrip) {
+		emit diveListNotifier.divesChanged(trip, divesInTrip, DiveField::DIVESITE);
+	});
+
 	sites.clear();
 
 	return res;
@@ -344,6 +358,7 @@ void MergeDiveSites::undo()
 	}
 
 	sitesToRemove = std::move(addDiveSites(sitesToAdd));
+
 	processByTrip(divesChanged, [&](dive_trip *trip, const QVector<dive *> &divesInTrip) {
 		emit diveListNotifier.divesChanged(trip, divesInTrip, DiveField::DIVESITE);
 	});

qt-models/divetripmodel.cpp

@@ -876,6 +876,12 @@ void DiveTripModelTree::divesDeleted(dive_trip *trip, bool deleteTrip, const QVe
 
 void DiveTripModelTree::divesChanged(dive_trip *trip, const QVector<dive *> &dives)
 {
+	// Update filter flags. TODO: The filter should update the flag by itself when
+	// recieving the signals below.
+	bool diveChanged = false;
+	for (dive *d: dives)
+		diveChanged |= MultiFilterSortModel::instance()->updateDive(d);
+
 	if (!trip) {
 		// This is outside of a trip. Process top-level items range-wise.
 
@@ -910,6 +916,10 @@ void DiveTripModelTree::divesChanged(dive_trip *trip, const QVector<dive *> &div
 
 		// If necessary, move the trip
 		topLevelChanged(idx);
+
+		// If a dive changed, re-render the trip in the list [or actually make it (in)visible].
+		if (diveChanged)
+			dataChanged(createIndex(idx, 0, noParent), createIndex(idx, 0, noParent));
 	}
 }
 
@@ -1161,6 +1171,11 @@ void DiveTripModelList::divesDeleted(dive_trip *trip, bool deleteTrip, const QVe
 
 void DiveTripModelList::divesChanged(dive_trip *trip, const QVector<dive *> &dives)
 {
+	// Update filter flags. TODO: The filter should update the flag by itself when
+	// recieving the signals below.
+	for (dive *d: dives)
+		MultiFilterSortModel::instance()->updateDive(d);
+
 	// Since we know that the dive list is sorted, we will only ever search for the first element
 	// in dives as this must be the first that we encounter. Once we find a range, increase the
 	// index accordingly.

qt-models/filtermodels.cpp

@@ -249,6 +249,18 @@ void MultiFilterSortModel::myInvalidate()
 #endif
 }
 
+bool MultiFilterSortModel::updateDive(struct dive *d)
+{
+	bool oldStatus = !d->hidden_by_filter;
+	bool newStatus = showDive(d);
+	bool changed = oldStatus != newStatus;
+	if (changed) {
+		filter_dive(d, newStatus);
+		divesDisplayed += newStatus - oldStatus;
+	}
+	return changed;
+}
+
 void MultiFilterSortModel::clearFilter()
 {
 	myInvalidate();

qt-models/filtermodels.h

@@ -60,6 +60,7 @@ public:
 	static MultiFilterSortModel *instance();
 	bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
 	bool showDive(const struct dive *d) const;
+	bool updateDive(struct dive *d); // returns true if visibility status changed
 	int divesDisplayed;
 	bool lessThan(const QModelIndex &, const QModelIndex &) const override;
 public