Add a method to ExtractDelegate for querying if the extraction has been cancelled.

common/qnaturalsorting.cpp

@@ -0,0 +1,32 @@
+#include "qnaturalsorting.h"
+
+#include <QCollator>
+
+
+
+int naturalCompare(const QString &s1, const QString &s2,  Qt::CaseSensitivity caseSensitivity)
+{
+    QCollator c;
+    c.setCaseSensitivity(caseSensitivity);
+    c.setNumericMode(true);
+    return c.compare(s1, s2);
+}
+bool naturalSortLessThanCS( const QString &left, const QString &right )
+{
+  return (naturalCompare( left, right, Qt::CaseSensitive ) < 0);
+}
+
+bool naturalSortLessThanCI( const QString &left, const QString &right )
+{
+	return (naturalCompare( left, right, Qt::CaseInsensitive ) < 0);
+}
+
+bool naturalSortLessThanCIFileInfo(const QFileInfo & left,const QFileInfo & right)
+{
+	return naturalSortLessThanCI(left.fileName(),right.fileName());
+}
+
+bool naturalSortLessThanCILibraryItem(LibraryItem * left, LibraryItem * right)
+{
+	return naturalSortLessThanCI(left->name,right->name);
+}