1 files changed, 19 insertions, 7 deletions

diff --git a/qt-ui/profile/diveprofileitem.h b/qt-ui/profile/diveprofileitem.h
index 980b99213..4dd32b9fa 100644
--- a/qt-ui/profile/diveprofileitem.h
+++ b/qt-ui/profile/diveprofileitem.h
@@ -3,6 +3,8 @@
 
 #include <QObject>
 #include <QGraphicsPolygonItem>
+#include <QModelIndex>
+
 #include "graphicsview-common.h"
 #include "divelineitem.h"
 
@@ -41,8 +43,17 @@ public:
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) = 0;
 public slots:
 	virtual void preferencesChanged();
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 protected:
+	/* when the model emits a 'datachanged' signal, this method below should be used to check if the
+	 * modified data affects this particular item ( for example, when setting the '3m increment'
+	 * the data for Ceiling and tissues will be changed, and only those. so, the topLeft will be the CEILING
+	 * column and the bottomRight will have the TISSUE_16 column. this method takes the vDataColumn and hDataColumn
+	 * into consideration when returning 'true' for "yes, continue the calculation', and 'false' for
+	 * 'do not recalculate, we already have the right data.
+	 */
+	bool shouldCalculateStuff(const QModelIndex& topLeft, const QModelIndex& bottomRight);
+
 	DiveCartesianAxis *hAxis;
 	DiveCartesianAxis *vAxis;
 	DivePlotDataModel *dataModel;
@@ -56,7 +67,7 @@ class DiveProfileItem : public AbstractProfilePolygonItem{
 
 public:
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void preferencesChanged();
 	void plot_depth_sample(struct plot_data *entry,QFlags<Qt::AlignmentFlag> flags,const QColor& color);
 private:
@@ -68,7 +79,7 @@ class DiveTemperatureItem : public AbstractProfilePolygonItem{
 	Q_OBJECT
 public:
 	DiveTemperatureItem();
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
 private:
 	void createTextItem(int seconds, int mkelvin);
@@ -78,7 +89,7 @@ class DiveGasPressureItem : public AbstractProfilePolygonItem{
 	Q_OBJECT
 
 public:
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
 private:
 	void plot_pressure_value(int mbar, int sec, QFlags<Qt::AlignmentFlag> align);
@@ -91,10 +102,11 @@ class DiveCalculatedCeiling : public AbstractProfilePolygonItem{
 
 public:
 	DiveCalculatedCeiling();
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
 	virtual void preferencesChanged();
 private:
+	bool is3mIncrement;
 	DiveTextItem *gradientFactor;
 };
 
@@ -102,7 +114,7 @@ class DiveReportedCeiling : public AbstractProfilePolygonItem{
 	Q_OBJECT
 
 public:
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
 	virtual void preferencesChanged();
 };
@@ -131,7 +143,7 @@ class PartialPressureGasItem : public AbstractProfilePolygonItem{
 public:
 	PartialPressureGasItem();
 	virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
-	virtual void modelDataChanged();
+	virtual void modelDataChanged(const QModelIndex& topLeft = QModelIndex(), const QModelIndex& bottomRight = QModelIndex());
 	virtual void preferencesChanged();
 	void setThreshouldSettingsKey(const QString& threshouldSettingsKey);
 	void setVisibilitySettingsKey(const QString& setVisibilitySettingsKey);