Undo: implement undo of dive site description editing

Simply duplicate the code of dive site name editing. Split out
the common functionality that swaps a C and a Qt string.

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

desktop-widgets/command.cpp

@@ -88,4 +88,9 @@ void editDiveSiteName(dive_site *ds, const QString &value)
 	execute(new EditDiveSiteName(ds, value));
 }
 
+void editDiveSiteDescription(dive_site *ds, const QString &value)
+{
+	execute(new EditDiveSiteDescription(ds, value));
+}
+
 } // namespace Command

desktop-widgets/command.h

@@ -42,6 +42,7 @@ void mergeDives(const QVector <dive *> &dives);
 
 void deleteDiveSites(const QVector <dive_site *> &sites);
 void editDiveSiteName(dive_site *ds, const QString &value);
+void editDiveSiteDescription(dive_site *ds, const QString &value);
 
 } // namespace Command
 

desktop-widgets/command_divesite.cpp

@@ -82,6 +82,15 @@ void DeleteDiveSites::undo()
 	sitesToRemove = std::move(addDiveSites(sitesToAdd));
 }
 
+// Helper function: swap C and Qt string
+static void swap(char *&c, QString &q)
+{
+	QString s = c;
+	free(c);
+	c = copy_qstring(q);
+	q = s;
+}
+
 EditDiveSiteName::EditDiveSiteName(dive_site *dsIn, const QString &name) : ds(dsIn),
 	value(name)
 {
@@ -95,10 +104,7 @@ bool EditDiveSiteName::workToBeDone()
 
 void EditDiveSiteName::redo()
 {
-	QString s = ds->name;
+	swap(ds->name, value);
-	free(ds->name);
-	ds->name = copy_qstring(value);
-	value = s;
 	emit diveListNotifier.diveSiteChanged(ds, LocationInformationModel::NAME); // Inform frontend of changed dive site.
 }
 
@@ -108,4 +114,27 @@ void EditDiveSiteName::undo()
 	redo();
 }
 
+EditDiveSiteDescription::EditDiveSiteDescription(dive_site *dsIn, const QString &description) : ds(dsIn),
+	value(description)
+{
+	setText(tr("Edit dive site description"));
+}
+
+bool EditDiveSiteDescription::workToBeDone()
+{
+	return value != QString(ds->description);
+}
+
+void EditDiveSiteDescription::redo()
+{
+	swap(ds->description, value);
+	emit diveListNotifier.diveSiteChanged(ds, LocationInformationModel::DESCRIPTION); // Inform frontend of changed dive site.
+}
+
+void EditDiveSiteDescription::undo()
+{
+	// Undo and redo do the same
+	redo();
+}
+
 } // namespace Command

desktop-widgets/command_divesite.h

@@ -38,6 +38,18 @@ private:
 	QString value; // Value to be set
 };
 
+class EditDiveSiteDescription : public Base {
+public:
+	EditDiveSiteDescription(dive_site *ds, const QString &description);
+private:
+	bool workToBeDone() override;
+	void undo() override;
+	void redo() override;
+
+	dive_site *ds;
+	QString value; // Value to be set
+};
+
 } // namespace Command
 
 #endif // COMMAND_DIVESITE_H

desktop-widgets/locationinformation.cpp

@@ -131,6 +131,10 @@ void LocationInformationWidget::diveSiteChanged(struct dive_site *ds, int field)
 	switch (field) {
 	case LocationInformationModel::NAME:
 		ui.diveSiteName->setText(diveSite->name);
+		return;
+	case LocationInformationModel::DESCRIPTION:
+		ui.diveSiteDescription->setText(diveSite->description);
+		return;
 	default:
 		return;
 	}

qt-models/divelocationmodel.cpp

@@ -234,6 +234,9 @@ bool DiveSiteSortedModel::setData(const QModelIndex &index, const QVariant &valu
 	case LocationInformationModel::NAME:
 		Command::editDiveSiteName(ds, value.toString());
 		return true;
+	case LocationInformationModel::DESCRIPTION:
+		Command::editDiveSiteDescription(ds, value.toString());
+		return true;
 	default:
 		return false;
 	}