Better handling of qreal with QVariant

3 files changed, 28 insertions, 15 deletions

diff --git a/src/corelib/kernel/qabstractitemmodel.cpp b/src/corelib/kernel/qabstractitemmodel.cpp
index cfc961c..61b19a2 100644
--- a/src/corelib/kernel/qabstractitemmodel.cpp
+++ b/src/corelib/kernel/qabstractitemmodel.cpp
@@ -488,35 +488,48 @@ const QHash<int,QByteArray> &QAbstractItemModelPrivate::defaultRoleNames()
     return *qDefaultRoleNames();
 }
 
-/*!
-    \internal
-    return true if \a value contains a numerical type
 
-    This function is used by our Q{Tree,Widget,Table}WidgetModel classes to sort.
-    We cannot rely on QVariant::canConvert because this would take strings as double
-    and then not sort strings correctly
-*/
-bool QAbstractItemModelPrivate::canConvertToDouble(const QVariant &value)
+static uint typeOfVariant(const QVariant &value)
 {
+    //return 0 for integer, 1 for floating point and 2 for other
     switch (value.userType()) {
         case QVariant::Bool:
         case QVariant::Int:
         case QVariant::UInt:
         case QVariant::LongLong:
         case QVariant::ULongLong:
-        case QVariant::Double:
         case QVariant::Char:
-        case QMetaType::Float:
         case QMetaType::Short:
         case QMetaType::UShort:
         case QMetaType::UChar:
         case QMetaType::ULong:
         case QMetaType::Long:
-            return true;
+            return 0;
+        case QVariant::Double:
+        case QMetaType::Float:
+            return 1;
         default:
-            return false;
+            return 2;
+    }
+}
+
+/*!
+    \internal
+    return true if \a value contains a numerical type
+
+    This function is used by our Q{Tree,Widget,Table}WidgetModel classes to sort.
+*/
+bool QAbstractItemModelPrivate::variantLessThan(const QVariant &v1, const QVariant &v2)
+{
+    switch(qMax(typeOfVariant(v1), typeOfVariant(v2)))
+    {
+    case 0: //integer type
+        return v1.toLongLong() < v2.toLongLong();
+    case 1: //floating point
+        return v1.toReal() < v2.toReal();
+    default:
+        return v1.toString() < v2.toString();
     }
-    return false;
 }
 
 void QAbstractItemModelPrivate::removePersistentIndexData(QPersistentModelIndexData *data)
diff --git a/src/corelib/kernel/qabstractitemmodel_p.h b/src/corelib/kernel/qabstractitemmodel_p.h
index 76c2d70..e81e627 100644
--- a/src/corelib/kernel/qabstractitemmodel_p.h
+++ b/src/corelib/kernel/qabstractitemmodel_p.h
@@ -89,7 +89,7 @@ public:
     void columnsAboutToBeRemoved(const QModelIndex &parent, int first, int last);
     void columnsRemoved(const QModelIndex &parent, int first, int last);
     static QAbstractItemModel *staticEmptyModel();
-    static bool canConvertToDouble(const QVariant &value);
+    static bool variantLessThan(const QVariant &v1, const QVariant &v2);
 
     inline QModelIndex createIndex(int row, int column, void *data = 0) const {
         return q_func()->createIndex(row, column, data);
diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index 3c430eb..66c4176 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -2776,7 +2776,7 @@ bool QVariant::cmp(const QVariant &v) const
     if (d.type != v2.d.type) {
         if (qIsNumericType(d.type) && qIsNumericType(v.d.type)) {
             if (qIsFloatingPoint(d.type) || qIsFloatingPoint(v.d.type))
-                return qFuzzyCompare(toDouble(), v.toDouble());
+                return qFuzzyCompare(toReal(), v.toReal());
             else
                 return toLongLong() == v.toLongLong();
         }