profile: introduce a ProfileScene stub

This simply subclasses QGraphicsScene and is used as
a drop-in replacement. The plan is to step-by-step
move rendering functions there until the non-interactive
code can only use the scene and doesn't have to use
the QGraphicsView. This will hopefully remove quite
some conditional code.

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

Subsurface-mobile.pro

@@ -170,6 +170,7 @@ SOURCES += subsurface-mobile-main.cpp \
 	profile-widget/diveeventitem.cpp \
 	profile-widget/diveprofileitem.cpp \
 	profile-widget/profilewidget2.cpp \
+	profile-widget/profilescene.cpp \
 	profile-widget/ruleritem.cpp \
 	profile-widget/animationfunctions.cpp \
 	profile-widget/divepixmapitem.cpp \
@@ -325,6 +326,7 @@ HEADERS += \
 	profile-widget/qmlprofile.h \
 	profile-widget/diveprofileitem.h \
 	profile-widget/profilewidget2.h \
+	profile-widget/profilescene.h \
 	profile-widget/ruleritem.h \
 	profile-widget/diveeventitem.h \
 	profile-widget/divetooltipitem.h \

profile-widget/CMakeLists.txt

@@ -22,6 +22,8 @@ set(SUBSURFACE_PROFILE_LIB_SRCS
 	divetooltipitem.h
 	profilewidget2.cpp
 	profilewidget2.h
+	profilescene.cpp
+	profilescene.h
 	ruleritem.cpp
 	ruleritem.h
 	tankitem.cpp

profile-widget/profilescene.cpp

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "profilescene.h"
+
+ProfileScene::ProfileScene()
+{
+}
+
+ProfileScene::~ProfileScene()
+{
+}

profile-widget/profilescene.h

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0
+// Displays the dive profile. Used by the interactive profile widget
+// and the printing/exporting code.
+#ifndef PROFILESCENE_H
+#define PROFILESCENE_H
+
+#include <QGraphicsScene>
+
+class ProfileScene : public QGraphicsScene {
+public:
+	ProfileScene();
+	~ProfileScene();
+};
+
+#endif

profile-widget/profilewidget2.cpp

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "profile-widget/profilewidget2.h"
+#include "profile-widget/profilescene.h"
 #include "qt-models/diveplotdatamodel.h"
 #include "core/event.h"
 #include "core/subsurface-string.h"
@@ -96,6 +97,7 @@ T *ProfileWidget2::createItem(const DiveCartesianAxis &vAxis, int vColumn, int z
 }
 
 ProfileWidget2::ProfileWidget2(DivePlannerPointsModel *plannerModelIn, double fontPrintScale, QWidget *parent) : QGraphicsView(parent),
+	profileScene(new ProfileScene),
 	currentState(INVALID),
 	dataModel(new DivePlotDataModel(this)),
 	plannerModel(plannerModelIn),
@@ -463,7 +465,7 @@ ItemPos::ItemPos()
 
 void ProfileWidget2::setupSceneAndFlags()
 {
-	setScene(new QGraphicsScene(this));
+	setScene(profileScene.get());
 	scene()->setSceneRect(0, 0, 100, 100);
 	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

profile-widget/profilewidget2.h

@@ -24,6 +24,7 @@
 #include "core/units.h"
 #include "core/subsurface-qt/divelistnotifier.h"
 
+class ProfileScene;
 class RulerItem2;
 struct dive;
 struct plot_info;
@@ -82,6 +83,7 @@ public:
 #ifndef SUBSURFACE_MOBILE
 	bool eventFilter(QObject *, QEvent *) override;
 #endif
+	std::unique_ptr<ProfileScene> profileScene;
 	State currentState;
 	int animSpeed;