profile: don't interpret NULL as current_dive in plotDive()

ProfileWidget2::plotDive() had this weird interface, where passing
in NULL as dive would mean "show current_dive". However, most callers
would already pass in current_dive. Therefore, unify and always pass
in current_dive if the caller wants to draw the current dive.

This allows us to interpret NULL as "show empty profile". Thus,
passing in current_dive when there is no current_dive simply shows
an empty profile. This makes the calling code in
MainWindow::selectionChanged() simpler.

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

2 files changed, 4 insertions, 8 deletions

diff --git a/profile-widget/profilewidget2.cpp b/profile-widget/profilewidget2.cpp
index f0afc0e73..71db3d66f 100644
--- a/profile-widget/profilewidget2.cpp
+++ b/profile-widget/profilewidget2.cpp
@@ -381,8 +381,7 @@ void ProfileWidget2::setupItemOnScene()
 
 void ProfileWidget2::replot()
 {
-	dataModel->clear();
-	plotDive(nullptr, true, false);
+	plotDive(current_dive, true, false);
 }
 
 void ProfileWidget2::createPPGas(PartialPressureGasItem *item, int verticalColumn, color_index_t color, color_index_t colorAlert,
@@ -566,11 +565,8 @@ void ProfileWidget2::plotDive(const struct dive *d, bool force, bool doClearPict
 #endif
 	if (currentState != ADD && currentState != PLAN) {
 		if (!d) {
-			if (!current_dive) {
-				setEmptyState();
-				return;
-			}
-			d = current_dive; // display the current dive
+			setEmptyState();
+			return;
 		}
 
 		// No need to do this again if we are already showing the same dive
diff --git a/profile-widget/profilewidget2.h b/profile-widget/profilewidget2.h
index 2e530261d..96191a1d6 100644
--- a/profile-widget/profilewidget2.h
+++ b/profile-widget/profilewidget2.h
@@ -76,7 +76,7 @@ public:
 	~ProfileWidget2();
 	void resetZoom();
 	void scale(qreal sx, qreal sy);
-	void plotDive(const struct dive *d = 0, bool force = false, bool clearPictures = false, bool instant = false);
+	void plotDive(const struct dive *d, bool force = false, bool clearPictures = false, bool instant = false);
 	void setupItem(AbstractProfilePolygonItem *item, DiveCartesianAxis *vAxis, int vData, int hData, int zValue);
 	void setPrintMode(bool mode, bool grayscale = false);
 	bool getPrintMode();