Cleanup: Turn DiveListSortModel into classical singleton

To make this class available from QMLManager, the run_ui()
function would create the object and then set a pointer in
QMLManager. It works, but is inconsistent with the rest of
the code. Therefore, make it a classical singleton class,
which is generated on demand.

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

4 files changed, 12 insertions, 7 deletions

diff --git a/mobile-widgets/qmlmanager.cpp b/mobile-widgets/qmlmanager.cpp
index fcb25e4a5..f6c182a55 100644
--- a/mobile-widgets/qmlmanager.cpp
+++ b/mobile-widgets/qmlmanager.cpp
@@ -825,7 +825,7 @@ void QMLManager::consumeFinishedLoad(timestamp_t currentDiveTimestamp)
 	process_loaded_dives();
 	DiveListModel::instance()->reload();
 	if (currentDiveTimestamp)
-		setUpdateSelectedDive(dlSortModel->getIdxForId(get_dive_id_closest_to(currentDiveTimestamp)));
+		setUpdateSelectedDive(DiveListSortModel::instance()->getIdxForId(get_dive_id_closest_to(currentDiveTimestamp)));
 	appendTextToLog(QStringLiteral("%1 dives loaded").arg(dive_table.nr));
 	if (dive_table.nr == 0)
 		setStartPageText(tr("Cloud storage open successfully. No dives in dive list."));
@@ -2056,7 +2056,7 @@ void QMLManager::setFilter(const QString filterText)
 	QMetaObject::invokeMethod(qmlWindow, "showBusy");
 	QtConcurrent::run(QThreadPool::globalInstance(),
 			  [=]{
-				dlSortModel->setFilter(filterText);
+				DiveListSortModel::instance()->setFilter(filterText);
 				QMetaObject::invokeMethod(qmlWindow, "hideBusy");
 			  });
 }
diff --git a/qt-models/divelistmodel.cpp b/qt-models/divelistmodel.cpp
index 6d94b09c9..d3c4e3ce2 100644
--- a/qt-models/divelistmodel.cpp
+++ b/qt-models/divelistmodel.cpp
@@ -6,7 +6,7 @@
 #include "core/ssrf.h" // for LOG_STP
 #include <QDateTime>
 
-DiveListSortModel::DiveListSortModel(QObject *parent) : QSortFilterProxyModel(parent)
+DiveListSortModel::DiveListSortModel()
 {
 	setSourceModel(DiveListModel::instance());
 	setDynamicSortFilter(true);
@@ -16,6 +16,12 @@ DiveListSortModel::DiveListSortModel(QObject *parent) : QSortFilterProxyModel(pa
 	LOG_STP("run_ui diveListModel sorted");
 }
 
+DiveListSortModel *DiveListSortModel::instance()
+{
+	static DiveListSortModel self;
+	return &self;
+}
+
 void DiveListSortModel::updateFilterState()
 {
 	if (filterString.isEmpty()) {
diff --git a/qt-models/divelistmodel.h b/qt-models/divelistmodel.h
index 87c5bb254..e7fb5369c 100644
--- a/qt-models/divelistmodel.h
+++ b/qt-models/divelistmodel.h
@@ -11,7 +11,8 @@ class DiveListSortModel : public QSortFilterProxyModel
 {
 	Q_OBJECT
 public:
-	DiveListSortModel(QObject *parent = 0);
+	DiveListSortModel();
+	static DiveListSortModel *instance();
 	void setSourceModel(QAbstractItemModel *sourceModel);
 	Q_INVOKABLE void reload();
 	Q_INVOKABLE QString tripTitle(const QString &trip);
diff --git a/subsurface-helper.cpp b/subsurface-helper.cpp
index 26e58ece9..c389e2099 100644
--- a/subsurface-helper.cpp
+++ b/subsurface-helper.cpp
@@ -96,14 +96,13 @@ void run_ui()
 	qDebug() << "QML import path" << engine.importPathList();
 #endif // __APPLE__ not Q_OS_IOS
 	engine.addImportPath("qrc://imports");
-	DiveListSortModel *sortModel = new DiveListSortModel(0);
 	QSortFilterProxyModel *gpsSortModel = new QSortFilterProxyModel(nullptr);
 	gpsSortModel->setSourceModel(GpsListModel::instance());
 	gpsSortModel->setDynamicSortFilter(true);
 	gpsSortModel->setSortRole(GpsListModel::GpsWhenRole);
 	gpsSortModel->sort(0, Qt::DescendingOrder);
 	QQmlContext *ctxt = engine.rootContext();
-	ctxt->setContextProperty("diveModel", sortModel);
+	ctxt->setContextProperty("diveModel", DiveListSortModel::instance());
 	ctxt->setContextProperty("gpsModel", gpsSortModel);
 	ctxt->setContextProperty("vendorList", vendorList);
 	set_non_bt_addresses();
@@ -135,7 +134,6 @@ void run_ui()
 	LOG_STP("run_ui show_computer_list");
 
 	manager->setDevicePixelRatio(qml_window->devicePixelRatio(), qml_window->screen());
-	manager->dlSortModel = sortModel;
 	manager->qmlWindow = qqWindowObject;
 	manager->screenChanged(screen);
 	qDebug() << "qqwindow screen has ldpi/pdpi" << screen->logicalDotsPerInch() << screen->physicalDotsPerInch();