Dive site rewrite: try to fix a crash

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

divesite.c

@@ -169,3 +169,13 @@ void copy_dive_site(struct dive_site *orig, struct dive_site *copy)
 	copy->notes = copy_string(orig->notes);
 	copy->description = copy_string(orig->description);
 }
+
+void clear_dive_site(struct dive_site *ds)
+{
+	free(ds->name);
+	free(ds->notes);
+	free(ds->description);
+	ds->latitude.udeg = 0;
+	ds->longitude.udeg = 0;
+	ds->uuid = 0;
+}

divesite.h

@@ -56,6 +56,7 @@ uint32_t get_dive_site_uuid_by_gps(degrees_t latitude, degrees_t longitude, stru
 uint32_t get_dive_site_uuid_by_gps_proximity(degrees_t latitude, degrees_t longitude, int distance, struct dive_site **dsp);
 bool dive_site_is_empty(struct dive_site *ds);
 void copy_dive_site(struct dive_site *orig, struct dive_site *copy);
+void clear_dive_site(struct dive_site *ds);
 
 #ifdef __cplusplus
 }

qt-ui/locationinformation.cpp

@@ -229,7 +229,7 @@ void LocationInformationWidget::resetPallete()
 
 SimpleDiveSiteEditDialog::SimpleDiveSiteEditDialog(QWidget *parent) :
 	QDialog(parent,  Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::Popup),
-	ui(new Ui::SimpleDiveSiteEditDialog())
+	ui(new Ui::SimpleDiveSiteEditDialog()), changed(false)
 {
 	ui->setupUi(this);
 }
@@ -262,31 +262,50 @@ void SimpleDiveSiteEditDialog::showEvent(QShowEvent *ev)
 	const char *gps_text = printGPSCoords(displayed_dive_site.latitude.udeg, displayed_dive_site.longitude.udeg);
 	ui->diveSiteCoordinates->setText(QString(gps_text));
 	free( (void*) gps_text);
+
+	changed = false;
 }
 
 void SimpleDiveSiteEditDialog::on_diveSiteName_editingFinished()
 {
+	if (ui->diveSiteName->text() == displayed_dive_site.name)
+		return;
 	free(displayed_dive_site.name);
 	displayed_dive_site.name = copy_string(qPrintable(ui->diveSiteName->text()));
+	changed = true;
 }
 
 void SimpleDiveSiteEditDialog::on_diveSiteCoordinates_editingFinished()
 {
 	double lat, lon;
+	uint32_t uLat, uLon;
 
 	parseGpsText(ui->diveSiteCoordinates->text(), &lat, &lon);
-	displayed_dive_site.latitude.udeg = lat * 1000000;
+	uLat = lat * 1000000;
-	displayed_dive_site.longitude.udeg = lon * 1000000;
+	uLon = lon * 1000000;
+
+	if (uLat == displayed_dive_site.latitude.udeg && uLon == displayed_dive_site.longitude.udeg)
+		return;
+
+	displayed_dive_site.latitude.udeg = uLat;
+	displayed_dive_site.longitude.udeg = uLon;
+	changed = true;
 }
 
 void SimpleDiveSiteEditDialog::on_diveSiteDescription_editingFinished()
 {
+	if (ui->diveSiteDescription->text() == displayed_dive_site.description)
+		return;
 	free(displayed_dive_site.description);
 	displayed_dive_site.description = copy_string(qPrintable(ui->diveSiteDescription->text()));
+	changed = true;
 }
 
 void SimpleDiveSiteEditDialog::on_diveSiteNotes_editingFinished()
 {
+	if (ui->diveSiteNotes->text() == displayed_dive_site.notes)
+		return;
 	free(displayed_dive_site.notes);
 	displayed_dive_site.notes = copy_string(qPrintable(ui->diveSiteNotes->text()));
+	changed = true;
 }

qt-ui/locationinformation.h

@@ -51,6 +51,7 @@ Q_OBJECT
 public:
 	SimpleDiveSiteEditDialog(QWidget *parent);
 	virtual ~SimpleDiveSiteEditDialog();
+	bool changed;
 public slots:
 	void on_diveSiteName_editingFinished();
 	void on_diveSiteCoordinates_editingFinished();

qt-ui/maintab.cpp

@@ -492,10 +492,15 @@ void MainTab::updateDiveInfo(bool clear)
 
 	if (!clear) {
 		struct dive_site *ds = get_dive_site_by_uuid(displayed_dive.dive_site_uuid);
-		if (ds)
+		if (ds) {
 			ui.location->setText(ds->name);
-		else
+			ui.locationTags->setText(ds->description); // TODO: This should be three tags following davide's explanation.
+			copy_dive_site(get_dive_site_by_uuid(displayed_dive.dive_site_uuid), &displayed_dive_site);
+		} else {
 			ui.location->clear();
+			clear_dive_site(&displayed_dive_site);
+		}
+
 		// Subsurface always uses "local time" as in "whatever was the local time at the location"
 		// so all time stamps have no time zone information and are in UTC
 		QDateTime localTime = QDateTime::fromTime_t(displayed_dive.when - gettimezoneoffset(displayed_dive.when));
@@ -698,13 +703,10 @@ void MainTab::updateDiveInfo(bool clear)
 				gasUsedString.append(QString("O2: %2\n").arg(get_volume_string(o2_tot, true)));
 		}
 		ui.gasConsumption->setText(gasUsedString);
-		ui.locationTags->setText(ds->description); // TODO: This should be three tags following davide's explanation.
 		if(ui.locationTags->text().isEmpty())
 			ui.locationTags->hide();
 		else
 			ui.locationTags->show();
-		copy_dive_site(get_dive_site_by_uuid(displayed_dive.dive_site_uuid), &displayed_dive_site);
-
 	} else {
 		/* clear the fields */
 		clearInfo();