--- a/src/gui/itemviews/qproxymodel.h	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/gui/itemviews/qproxymodel.h	Tue Jul 06 15:10:48 2010 +0300
@@ -67,19 +67,19 @@
 
     // implementing model interface
 
-    QModelIndex index(int row, int column, const QModelIndex &parent) const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
     QModelIndex parent(const QModelIndex &child) const;
 
-    int rowCount(const QModelIndex &parent) const;
-    int columnCount(const QModelIndex &parent) const;
-    bool hasChildren(const QModelIndex &parent) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
 
-    QVariant data(const QModelIndex &index, int role) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role);
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
     bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value,
-                       int role);
+                       int role = Qt::EditRole);
 
     QStringList mimeTypes() const;
     QMimeData *mimeData(const QModelIndexList &indexes) const;
@@ -87,16 +87,17 @@
                       int row, int column, const QModelIndex &parent);
     Qt::DropActions supportedDropActions() const;
 
-    bool insertRows(int row, int count, const QModelIndex &parent);
-    bool insertColumns(int column, int count, const QModelIndex &parent);
+    bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex());
 
     void fetchMore(const QModelIndex &parent);
     Qt::ItemFlags flags(const QModelIndex &index) const;
 
-    void sort(int column, Qt::SortOrder order);
+    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
 
     QModelIndexList match(const QModelIndex &start, int role, const QVariant &value,
-                          int hits, Qt::MatchFlags flags) const;
+                          int hits = 1, Qt::MatchFlags flags =
+                          Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const;
 
     QSize span(const QModelIndex &index) const;