Filter: move num_shown logic from model to core

Since the number of shown dives is stored in the core, let's also
keep it updated there.

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

core/divelist.c

@@ -900,13 +900,19 @@ void deselect_dive(struct dive *dive)
 }
 
 int shown_dives = 0;
-void filter_dive(struct dive *d, bool shown)
+bool filter_dive(struct dive *d, bool shown)
 {
+	bool old_shown, changed;
 	if (!d)
-		return;
+		return false;
+	old_shown = !d->hidden_by_filter;
 	d->hidden_by_filter = !shown;
 	if (!shown && d->selected)
 		deselect_dive(d);
+	changed = old_shown != shown;
+	if (changed)
+		shown_dives += shown - old_shown;
+	return changed;
 }
 
 void mark_divelist_changed(bool changed)
@@ -927,9 +933,13 @@ void process_loaded_dives()
 	int i;
 	struct dive *dive;
 
-	/* Register dive computer nick names */
+	/* Register dive computer nick names and count shown dives. */
-	for_each_dive(i, dive)
+	shown_dives = 0;
+	for_each_dive(i, dive) {
+		if (!dive->hidden_by_filter)
+			shown_dives++;
 		set_dc_nickname(dive);
+	}
 
 	sort_dive_table(&dive_table);
 	sort_trip_table(&trip_table);
@@ -1448,6 +1458,7 @@ void clear_dive_file_data()
 	while (dive_table.nr)
 		delete_single_dive(0);
 	current_dive = NULL;
+	shown_dives = 0;
 	while (dive_site_table.nr)
 		delete_dive_site(get_dive_site(0, &dive_site_table), &dive_site_table);
 	if (trip_table.nr != 0) {

core/divelist.h

@@ -44,7 +44,7 @@ extern int remove_dive(const struct dive *dive, struct dive_table *table);
 extern bool consecutive_selected();
 extern void select_dive(struct dive *dive);
 extern void deselect_dive(struct dive *dive);
-extern void filter_dive(struct dive *d, bool shown);
+extern bool filter_dive(struct dive *d, bool shown); /* returns true if status changed */
 extern struct dive *first_selected_dive();
 extern struct dive *last_selected_dive();
 extern int get_dive_nr_at_idx(int idx);

qt-models/divetripmodel.cpp

@@ -1377,7 +1377,6 @@ void DiveTripModelList::filterFinished()
 	// In list mode, we don't have to change anything after filter finished.
 }
 
-
 // Simple sorting helper for sorting against a criterium and if
 // that is undefined against a different criterium.
 // Return true if diff1 < 0, false if diff1 > 0.

qt-models/filtermodels.cpp

@@ -57,8 +57,6 @@ void MultiFilterSortModel::myInvalidate()
 		// as a consequence of the filterFinished signal right after the local scope.
 		auto marker = diveListNotifier.enterCommand();
 
-		shown_dives = 0;
-
 		DiveFilter *filter = DiveFilter::instance();
 		for (int i = 0; i < m->rowCount(QModelIndex()); ++i) {
 			QModelIndex idx = m->index(i, 0, QModelIndex());
@@ -75,18 +73,14 @@ void MultiFilterSortModel::myInvalidate()
 						continue;
 					}
 					bool show = filter->showDive(d);
-					if (show) {
+					if (show)
-						shown_dives++;
 						showTrip = true;
-					}
 					m->setData(idx2, show, DiveTripModelBase::SHOWN_ROLE);
 				}
 				m->setData(idx, showTrip, DiveTripModelBase::SHOWN_ROLE);
 			} else {
 				dive *d = m->data(idx, DiveTripModelBase::DIVE_ROLE).value<dive *>();
 				bool show = (d != NULL) && filter->showDive(d);
-				if (show)
-					shown_dives++;
 				m->setData(idx, show, DiveTripModelBase::SHOWN_ROLE);
 			}
 		}
@@ -103,14 +97,8 @@ void MultiFilterSortModel::myInvalidate()
 
 bool MultiFilterSortModel::updateDive(struct dive *d)
 {
-	bool oldStatus = !d->hidden_by_filter;
 	bool newStatus = DiveFilter::instance()->showDive(d);
-	bool changed = oldStatus != newStatus;
+	return filter_dive(d, newStatus);
-	if (changed) {
-		filter_dive(d, newStatus);
-		shown_dives += newStatus - oldStatus;
-	}
-	return changed;
 }
 
 bool MultiFilterSortModel::lessThan(const QModelIndex &i1, const QModelIndex &i2) const