Filter: send filterReset via signal

The old code called directly into the DiveListModel. Instead,
send a signal and hook into the signal from the model. This
will allow us to remove the DiveListModel::instance() function.

This, in turn, is a step towards supporting multiple models
at the same time. However, currently the model manually
sets the hidden_by_filter flag in the core and therefore
only one active model is supported at a time.

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

core/divefilter.cpp

@@ -193,7 +193,7 @@ void DiveFilter::startFilterDiveSites(QVector<dive_site *> ds)
 		// When switching into dive site mode, reload the dive sites.
 		// We won't do this in myInvalidate() once we are in dive site mode.
 		MapWidget::instance()->reload();
-		DiveTripModelBase::instance()->recalculateFilter();
+		emit diveListNotifier.filterReset();
 	}
 }
 
@@ -202,7 +202,7 @@ void DiveFilter::stopFilterDiveSites()
 	if (--diveSiteRefCount > 0)
 		return;
 	dive_sites.clear();
-	DiveTripModelBase::instance()->recalculateFilter();
+	emit diveListNotifier.filterReset();
 	MapWidget::instance()->reload();
 }
 
@@ -215,7 +215,7 @@ void DiveFilter::setFilterDiveSite(QVector<dive_site *> ds)
 		return;
 	dive_sites = ds;
 
-	DiveTripModelBase::instance()->recalculateFilter();
+	emit diveListNotifier.filterReset();
 	MapWidget::instance()->setSelected(dive_sites);
 	MainWindow::instance()->diveList->expandAll();
 }
@@ -233,6 +233,6 @@ bool DiveFilter::diveSiteMode() const
 void DiveFilter::setFilter(const FilterData &data)
 {
 	filterData = data;
-	DiveTripModelBase::instance()->recalculateFilter();
+	emit diveListNotifier.filterReset();
 }
 #endif // SUBSURFACE_MOBILE

qt-models/divetripmodel.cpp

@@ -575,6 +575,7 @@ DiveTripModelTree::DiveTripModelTree(QObject *parent) : DiveTripModelBase(parent
 	connect(&diveListNotifier, &DiveListNotifier::divesTimeChanged, this, &DiveTripModelTree::divesTimeChanged);
 	connect(&diveListNotifier, &DiveListNotifier::divesSelected, this, &DiveTripModelTree::divesSelected);
 	connect(&diveListNotifier, &DiveListNotifier::tripChanged, this, &DiveTripModelTree::tripChanged);
+	connect(&diveListNotifier, &DiveListNotifier::filterReset, this, &DiveTripModelTree::filterReset);
 
 	// Fill model
 	for (int i = 0; i < dive_table.nr ; ++i) {
@@ -745,7 +746,11 @@ bool DiveTripModelTree::calculateFilterForTrip(const std::vector<dive *> &dives,
 	return showTrip;
 }
 
-void DiveTripModelTree::recalculateFilter()
+// This recalculates the filters and sends appropriate changed signals.
+// Attention: Since this uses / modifies the hidden_by_filter flag of the
+// core dive structure, only one DiveTripModel[Tree|List] must exist at
+// a given time!
+void DiveTripModelTree::filterReset()
 {
 	// Collect the changes in a vector used later to send signals.
 	// This could be solved more efficiently in one pass, but
@@ -791,7 +796,6 @@ void DiveTripModelTree::recalculateFilter()
 	}
 
 	emit diveListNotifier.numShownChanged();
-	emit diveListNotifier.filterReset();
 }
 
 
@@ -1291,6 +1295,7 @@ DiveTripModelList::DiveTripModelList(QObject *parent) : DiveTripModelBase(parent
 	//connect(&diveListNotifier, &DiveListNotifier::divesMovedBetweenTrips, this, &DiveTripModelList::divesMovedBetweenTrips);
 	connect(&diveListNotifier, &DiveListNotifier::divesTimeChanged, this, &DiveTripModelList::divesTimeChanged);
 	connect(&diveListNotifier, &DiveListNotifier::divesSelected, this, &DiveTripModelList::divesSelected);
+	connect(&diveListNotifier, &DiveListNotifier::filterReset, this, &DiveTripModelList::filterReset);
 
 	// Fill model
 	items.reserve(dive_table.nr);
@@ -1332,7 +1337,11 @@ dive *DiveTripModelList::diveOrNull(const QModelIndex &index) const
 	return items[row];
 }
 
-void DiveTripModelList::recalculateFilter()
+// This recalculates the filters and sends appropriate changed signals.
+// Attention: Since this uses / modifies the hidden_by_filter flag of the
+// core dive structure, only one DiveTripModel[Tree|List] must exist at
+// a given time!
+void DiveTripModelList::filterReset()
 {
 	// Collect the changes in a vector used later to send signals.
 	// This could be solved more efficiently in one pass, but
@@ -1342,7 +1351,7 @@ void DiveTripModelList::recalculateFilter()
 	changed.reserve(items.size());
 	{
 		// This marker prevents the UI from getting notifications on selection changes.
-		// It is active until the end of the scope. See comment in DiveTripModelTree::recalculateFilter().
+		// It is active until the end of the scope. See comment in DiveTripModelTree::filterReset().
 		auto marker = diveListNotifier.enterCommand();
 		DiveFilter *filter = DiveFilter::instance();
 
@@ -1356,7 +1365,6 @@ void DiveTripModelList::recalculateFilter()
 	sendShownChangedSignals(changed, noParent);
 
 	emit diveListNotifier.numShownChanged();
-	emit diveListNotifier.filterReset();
 }
 
 QVariant DiveTripModelList::data(const QModelIndex &index, int role) const

qt-models/divetripmodel.h

@@ -83,7 +83,6 @@ public:
 	bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
 	DiveTripModelBase(QObject *parent = 0);
 	int columnCount(const QModelIndex&) const;
-	virtual void recalculateFilter() = 0;
 
 	// Used for sorting. This is a bit of a layering violation, as sorting should be performed
 	// by the higher-up QSortFilterProxyModel, but it makes things so much easier!
@@ -121,6 +120,7 @@ public slots:
 	void divesTimeChanged(timestamp_t delta, const QVector<dive *> &dives);
 	void divesSelected(const QVector<dive *> &dives, dive *current);
 	void tripChanged(dive_trip *trip, TripField);
+	void filterReset();
 
 public:
 	DiveTripModelTree(QObject *parent = nullptr);
@@ -133,7 +133,6 @@ private:
 	bool lessThan(const QModelIndex &i1, const QModelIndex &i2) const override;
 	void divesSelectedTrip(dive_trip *trip, const QVector<dive *> &dives, QVector<QModelIndex> &);
 	dive *diveOrNull(const QModelIndex &index) const override;
-	void recalculateFilter();
 	void divesChangedTrip(dive_trip *trip, const QVector<dive *> &dives);
 	void divesTimeChangedTrip(dive_trip *trip, timestamp_t delta, const QVector<dive *> &dives);
 	bool calculateFilterForTrip(const std::vector<dive *> &dives, const DiveFilter *filter, quintptr parentIndex);
@@ -188,6 +187,7 @@ public slots:
 	// Does nothing in list view.
 	//void divesMovedBetweenTrips(dive_trip *from, dive_trip *to, bool deleteFrom, bool createTo, const QVector<dive *> &dives);
 	void divesSelected(const QVector<dive *> &dives, dive *current);
+	void filterReset();
 
 public:
 	DiveTripModelList(QObject *parent = nullptr);
@@ -199,7 +199,6 @@ private:
 	QVariant data(const QModelIndex &index, int role) const override;
 	bool lessThan(const QModelIndex &i1, const QModelIndex &i2) const override;
 	dive *diveOrNull(const QModelIndex &index) const override;
-	void recalculateFilter();
 
 	std::vector<dive *> items;				// TODO: access core data directly
 };