symbology-ng: sort the category items when classifying them #4206

src/core/symbology-ng/qgssymbollayerv2utils.cpp

@@ -764,3 +764,47 @@ void QgsSymbolLayerV2Utils::multiplyImageOpacity( QImage* image, qreal alpha )
     }
   }
 }
+
+static bool _QVariantLessThan( const QVariant& lhs, const QVariant& rhs )
+{
+  switch( lhs.type() )
+  {
+  case QVariant::Int:
+    return lhs.toInt() < rhs.toInt();
+  case QVariant::UInt:
+    return lhs.toUInt() < rhs.toUInt();
+  case QVariant::LongLong:
+    return lhs.toLongLong() < rhs.toLongLong();
+  case QVariant::ULongLong:
+    return lhs.toULongLong() < rhs.toULongLong();
+  case QVariant::Double:
+    return lhs.toDouble() < rhs.toDouble();
+  case QVariant::Char:
+    return lhs.toChar() < rhs.toChar();
+  case QVariant::Date:
+    return lhs.toDate() < rhs.toDate();
+  case QVariant::Time:
+    return lhs.toTime() < rhs.toTime();
+  case QVariant::DateTime:
+    return lhs.toDateTime() < rhs.toDateTime();
+  default:
+    return QString::localeAwareCompare( lhs.toString(), rhs.toString() ) < 0;
+  }
+}
+
+static bool _QVariantGreaterThan( const QVariant& lhs, const QVariant& rhs )
+{
+  return ! _QVariantLessThan( lhs, rhs);
+}
+
+void QgsSymbolLayerV2Utils::sortVariantList( QList<QVariant>& list, Qt::SortOrder order )
+{
+  if (order == Qt::AscendingOrder)
+  {
+    qSort( list.begin(), list.end(), _QVariantLessThan );
+  }
+  else // Qt::DescendingOrder
+  {
+    qSort( list.begin(), list.end(), _QVariantGreaterThan );
+  }
+}

src/core/symbology-ng/qgssymbollayerv2utils.h

@@ -5,6 +5,7 @@
 
 #include <QMap>
 #include <Qt>
+#include <QtCore>
 #include "qgssymbolv2.h"
 
 class QgsSymbolV2;
@@ -81,6 +82,9 @@ class CORE_EXPORT QgsSymbolLayerV2Utils
 
     /**Multiplies opacity of image pixel values with a (global) transparency value*/
     static void multiplyImageOpacity( QImage* image, qreal alpha );
+
+	/**Sorts the passed list in requested order*/
+	static void sortVariantList( QList<QVariant>& list, Qt::SortOrder order );
 };
 
 class QPolygonF;

src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.cpp

@@ -222,7 +222,8 @@ void QgsCategorizedSymbolRendererV2Widget::changeCategorySymbol()
 static void _createCategories( QgsCategoryList& cats, QList<QVariant>& values, QgsSymbolV2* symbol, QgsVectorColorRampV2* ramp )
 {
   // sort the categories first
-  // TODO: sortVariantList(values);
+  //TODO: make the order configurable?
+  QgsSymbolLayerV2Utils::sortVariantList( values, Qt::AscendingOrder );
 
   int num = values.count();
 

src/gui/symbology-ng/qgscategorizedsymbolrendererv2widget.h

@@ -1,6 +1,7 @@
 #ifndef QGSCATEGORIZEDSYMBOLRENDERERV2WIDGET_H
 #define QGSCATEGORIZEDSYMBOLRENDERERV2WIDGET_H
 
+#include "qgscategorizedsymbolrendererv2.h"
 #include "qgsrendererv2widget.h"
 #include <QStandardItem>