Untangle DiveCalculatedCeiling from MainWindow

DiveCalculatedCeiling is the last class the references
MainWindow in the profile-widget stack.

In modelDataChanged() it looks for the information()
widget and sets a slot for the dateTimeChanged() signal that
information() emits.

To solve the issue we make DiveCalculatedCeiling recieve
a ProfileWidget2 reference and make ProfileWidget2 emit
the dateTimeChangedItems() signal.

ProfileWidget2 itself listens for the dateTimeChanged()
signal that information() emits and emits dateTimeChangedItems()
to notify any possible children/item listeners in the
ProfileWidget2::dateTimeChanged() slot.

The connection between ProfileWidget2 and information()
is set in MainWindow. This makes DiveCalculatedCeiling
unaware of MainWindow and which class originally emits
the dateTimeChanged() signal to ProfileWidget2.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
--
Think delegation.

Tomaz, please take a look at this one, to double check
if i messed up.

also i have zero idea how the mobile app is setting these
connections, if it does so even.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/mainwindow.cpp

@@ -181,6 +181,7 @@ MainWindow::MainWindow() : QMainWindow(),
 	connect(ui.actionRecent3, SIGNAL(triggered(bool)), this, SLOT(recentFileTriggered(bool)));
 	connect(ui.actionRecent4, SIGNAL(triggered(bool)), this, SLOT(recentFileTriggered(bool)));
 	connect(information(), SIGNAL(addDiveFinished()), graphics(), SLOT(setProfileState()));
+	connect(information(), SIGNAL(dateTimeChanged()), graphics(), SLOT(dateTimeChanged()));
 	connect(DivePlannerPointsModel::instance(), SIGNAL(planCreated()), this, SLOT(planCreated()));
 	connect(DivePlannerPointsModel::instance(), SIGNAL(planCanceled()), this, SLOT(planCanceled()));
 	connect(plannerDetails->printPlan(), SIGNAL(pressed()), divePlannerWidget(), SLOT(printDecoPlan()));

profile-widget/diveprofileitem.cpp

@@ -791,15 +791,16 @@ void DiveGasPressureItem::paint(QPainter *painter, const QStyleOptionGraphicsIte
 	painter->restore();
 }
 
-DiveCalculatedCeiling::DiveCalculatedCeiling() : is3mIncrement(false)
+DiveCalculatedCeiling::DiveCalculatedCeiling(ProfileWidget2 *widget) :
+	profileWidget(widget),
+	is3mIncrement(false)
 {
 	settingsChanged();
 }
 
 void DiveCalculatedCeiling::modelDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
 {
-	if (MainWindow::instance()->information())
-		connect(MainWindow::instance()->information(), SIGNAL(dateTimeChanged()), this, SLOT(recalc()), Qt::UniqueConnection);
+	connect(profileWidget, SIGNAL(dateTimeChangedItems()), this, SLOT(recalc()), Qt::UniqueConnection);
 
 	// We don't have enougth data to calculate things, quit.
 	if (!shouldCalculateStuff(topLeft, bottomRight))
@@ -830,7 +831,7 @@ void DiveCalculatedCeiling::paint(QPainter *painter, const QStyleOptionGraphicsI
 	QGraphicsPolygonItem::paint(painter, option, widget);
 }
 
-DiveCalculatedTissue::DiveCalculatedTissue()
+DiveCalculatedTissue::DiveCalculatedTissue(ProfileWidget2 *widget) : DiveCalculatedCeiling(widget)
 {
 	settingsChanged();
 }

profile-widget/diveprofileitem.h

@@ -21,6 +21,7 @@
  This is a generically item and should be used as a base for others, I think...
 */
 
+class ProfileWidget2;
 class DivePlotDataModel;
 class DiveTextItem;
 class DiveCartesianAxis;
@@ -175,7 +176,7 @@ class DiveCalculatedCeiling : public AbstractProfilePolygonItem {
 	Q_OBJECT
 
 public:
-	DiveCalculatedCeiling();
+	DiveCalculatedCeiling(ProfileWidget2 *profileWidget);
 	virtual void modelDataChanged(const QModelIndex &topLeft = QModelIndex(), const QModelIndex &bottomRight = QModelIndex());
 	virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
 	virtual void settingsChanged();
@@ -184,6 +185,9 @@ public
 slots:
 	void recalc();
 
+protected:
+	ProfileWidget2 *profileWidget;
+
 private:
 	bool is3mIncrement;
 };
@@ -200,7 +204,7 @@ public:
 class DiveCalculatedTissue : public DiveCalculatedCeiling {
 	Q_OBJECT
 public:
-	DiveCalculatedTissue();
+	DiveCalculatedTissue(ProfileWidget2 *profileWidget);
 	virtual void settingsChanged();
 };
 

profile-widget/profilewidget2.cpp

@@ -92,7 +92,7 @@ ProfileWidget2::ProfileWidget2(QWidget *parent) : QGraphicsView(parent),
 	cylinderPressureAxis(new DiveCartesianAxis(this)),
 	gasPressureItem(new DiveGasPressureItem()),
 	diveComputerText(new DiveTextItem()),
-	diveCeiling(new DiveCalculatedCeiling()),
+	diveCeiling(new DiveCalculatedCeiling(this)),
 	decoModelParameters(new DiveTextItem()),
 	reportedCeiling(new DiveReportedCeiling()),
 	pn2GasItem(new PartialPressureGasItem()),
@@ -302,7 +302,7 @@ void ProfileWidget2::setupItemOnScene()
 	setupItem(reportedCeiling, timeAxis, profileYAxis, dataModel, DivePlotDataModel::CEILING, DivePlotDataModel::TIME, 1);
 	setupItem(diveCeiling, timeAxis, profileYAxis, dataModel, DivePlotDataModel::CEILING, DivePlotDataModel::TIME, 1);
 	for (int i = 0; i < 16; i++) {
-		DiveCalculatedTissue *tissueItem = new DiveCalculatedTissue();
+		DiveCalculatedTissue *tissueItem = new DiveCalculatedTissue(this);
 		setupItem(tissueItem, timeAxis, profileYAxis, dataModel, DivePlotDataModel::TISSUE_1 + i, DivePlotDataModel::TIME, 1 + i);
 		allTissues.append(tissueItem);
 		DivePercentageItem *percentageItem = new DivePercentageItem(i);
@@ -708,6 +708,11 @@ void ProfileWidget2::recalcCeiling()
 	diveCeiling->recalc();
 }
 
+void ProfileWidget2::dateTimeChanged()
+{
+	emit dateTimeChangedItems();
+}
+
 void ProfileWidget2::settingsChanged()
 {
 	// if we are showing calculated ceilings then we have to replot()

profile-widget/profilewidget2.h

@@ -97,9 +97,11 @@ signals:
 	void refreshDisplay(bool recreateDivelist);
 	void updateDiveInfo(bool clear);
 	void editCurrentDive();
+	void dateTimeChangedItems();
 
 public
 slots: // Necessary to call from QAction's signals.
+	void dateTimeChanged();
 	void settingsChanged();
 	void setEmptyState();
 	void setProfileState();