diff -r 89c329efa980 -r e48454f237ca hgwidgets_plat/hgcacheproxymodel_api/inc/hgcacheproxymodel.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgwidgets_plat/hgcacheproxymodel_api/inc/hgcacheproxymodel.h	Mon May 03 13:32:54 2010 +0300
@@ -0,0 +1,157 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*  Version     : %version: 2 %
+*/
+
+#ifndef HGCACHEPROXYMODEL_H_
+#define HGCACHEPROXYMODEL_H_
+
+#include <QAbstractItemModel>
+#include <QSortFilterProxyModel>
+
+#include <hgwidgets/hgdataprovidermodel.h>
+
+#ifdef BUILD_CACHEPROXYMODEL
+#define CACHEPROXYMODEL_EXPORT Q_DECL_EXPORT
+#else
+#define CACHEPROXYMODEL_EXPORT Q_DECL_IMPORT
+#endif
+
+class HgBufferManager;
+
+const int KDefaultCacheSize = 120;
+const int KDefaultCacheTreshold = 30;
+
+class HgBufferManagerObserver
+{
+public:
+    enum HgRequestOrder {
+        HgRequestOrderAscending,
+        HgRequestOrderDescending
+    };   
+
+    virtual void release(int start, int end) = 0;
+    virtual void request(int start, int end, HgRequestOrder order = HgRequestOrderAscending) = 0;  
+};
+
+class HgCacheProxyModel : public QAbstractItemModel, public HgBufferManagerObserver, public HgDataProviderModelObserver
+{
+    Q_OBJECT
+public:
+    CACHEPROXYMODEL_EXPORT HgCacheProxyModel(QObject *parent = 0);
+    CACHEPROXYMODEL_EXPORT ~HgCacheProxyModel();   
+    
+    CACHEPROXYMODEL_EXPORT void setDataProvider(HgDataProviderModel *dataProvider, int cacheSize = KDefaultCacheSize, int cacheTreshold = KDefaultCacheTreshold);
+    CACHEPROXYMODEL_EXPORT HgDataProviderModel* DataProvider();
+    CACHEPROXYMODEL_EXPORT void resizeCache(int newSize, int newTreshold);
+    
+//from QAbstractItemModel
+    CACHEPROXYMODEL_EXPORT virtual QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    CACHEPROXYMODEL_EXPORT virtual QModelIndex parent(const QModelIndex &child) const;
+    CACHEPROXYMODEL_EXPORT virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    CACHEPROXYMODEL_EXPORT virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    CACHEPROXYMODEL_EXPORT virtual bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
+    CACHEPROXYMODEL_EXPORT virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    CACHEPROXYMODEL_EXPORT virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
+    CACHEPROXYMODEL_EXPORT virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    CACHEPROXYMODEL_EXPORT virtual bool setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role = Qt::EditRole);
+    CACHEPROXYMODEL_EXPORT virtual QMap<int, QVariant> itemData(const QModelIndex &index) const;
+    CACHEPROXYMODEL_EXPORT virtual bool setItemData(const QModelIndex &index, const QMap<int, QVariant> &roles);
+    CACHEPROXYMODEL_EXPORT virtual QStringList mimeTypes() const;
+    CACHEPROXYMODEL_EXPORT virtual QMimeData *mimeData(const QModelIndexList &indexes) const;
+    CACHEPROXYMODEL_EXPORT virtual bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent);
+    CACHEPROXYMODEL_EXPORT virtual Qt::DropActions supportedDropActions() const;
+    CACHEPROXYMODEL_EXPORT virtual bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    CACHEPROXYMODEL_EXPORT virtual bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex());
+    CACHEPROXYMODEL_EXPORT virtual bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex());
+    CACHEPROXYMODEL_EXPORT virtual bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex());
+    CACHEPROXYMODEL_EXPORT virtual void fetchMore(const QModelIndex &parent);
+    CACHEPROXYMODEL_EXPORT virtual bool canFetchMore(const QModelIndex &parent) const;
+    CACHEPROXYMODEL_EXPORT virtual Qt::ItemFlags flags(const QModelIndex &index) const;
+    CACHEPROXYMODEL_EXPORT virtual void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
+    CACHEPROXYMODEL_EXPORT virtual QModelIndex buddy(const QModelIndex &index) const;
+    CACHEPROXYMODEL_EXPORT virtual QModelIndexList match(const QModelIndex &start, int role,
+                                  const QVariant &value, int hits = 1,
+                                  Qt::MatchFlags flags =
+                                  Qt::MatchFlags(Qt::MatchStartsWith|Qt::MatchWrap)) const;
+    CACHEPROXYMODEL_EXPORT virtual QSize span(const QModelIndex &index) const;
+
+// for sorting
+    CACHEPROXYMODEL_EXPORT Qt::CaseSensitivity sortCaseSensitivity() const;
+    CACHEPROXYMODEL_EXPORT void setSortCaseSensitivity(Qt::CaseSensitivity cs);
+    CACHEPROXYMODEL_EXPORT bool isSortLocaleAware() const;
+    CACHEPROXYMODEL_EXPORT void setSortLocaleAware(bool on);
+    CACHEPROXYMODEL_EXPORT int sortColumn() const;
+    CACHEPROXYMODEL_EXPORT Qt::SortOrder sortOrder() const;
+    CACHEPROXYMODEL_EXPORT bool dynamicSortFilter() const;
+    CACHEPROXYMODEL_EXPORT void setDynamicSortFilter(bool enable);
+    CACHEPROXYMODEL_EXPORT int sortRole() const;
+    CACHEPROXYMODEL_EXPORT void setSortRole(int role);
+
+//for filtering
+//    CACHEPROXYMODEL_EXPORT QRegExp filterRegExp() const;
+//    CACHEPROXYMODEL_EXPORT void setFilterRegExp(const QRegExp &regExp);
+//    CACHEPROXYMODEL_EXPORT int filterKeyColumn() const;
+//    CACHEPROXYMODEL_EXPORT void setFilterKeyColumn(int column);
+//    CACHEPROXYMODEL_EXPORT Qt::CaseSensitivity filterCaseSensitivity() const;
+//    CACHEPROXYMODEL_EXPORT void setFilterCaseSensitivity(Qt::CaseSensitivity cs);
+//    CACHEPROXYMODEL_EXPORT int filterRole() const;
+//    CACHEPROXYMODEL_EXPORT void setFilterRole(int role);
+    
+public slots:
+    virtual bool submit();
+    virtual void revert();
+    
+public:
+//from HgBufferManagerObserver
+    CACHEPROXYMODEL_EXPORT virtual void release(int start, int end);
+    CACHEPROXYMODEL_EXPORT virtual void request(int start, int end, HgRequestOrder order = HgRequestOrderAscending);  
+    
+private:
+    int count()const;
+    QModelIndex mapToSource(const QModelIndex &index)const;
+    QModelIndex mapToSource(int row, int col) const;
+    int mapToDataProviderIndex(int myIndex) const;
+    int mapFromDataProviderIndex(int myIndex) const;
+    void cleanupForBMResetIfNeeded();
+    void resetBMIfNeeded();
+    void releaseAll();
+    void setBufferPosition(int pos) const;
+    
+private slots:
+    void sourceReset();
+    void sourceAboutToBeReset();
+    void sourceRowsInserted(const QModelIndex &source_parent, int start, int end);
+    void sourceRowsRemoved(const QModelIndex &source_parent, int start, int end);
+    void dataUpdated(QModelIndex from, QModelIndex to);
+    
+//from HgDataProviderModelObserver    
+public:
+    CACHEPROXYMODEL_EXPORT virtual void dataUpdated(int from, int to);
+    
+private:
+    HgBufferManager* mBufferManager;
+    QSortFilterProxyModel* mSortFilterProxyModel;
+    HgDataProviderModel* mDataProviderModel;
+    mutable bool mResetNeeded;
+    mutable bool mSupressBM;
+    mutable int mCurrentPos;
+    bool mSortParameterChanged;
+    bool mFilterParameterChanged;
+    
+};
+
+#endif // HGCACHEPROXYMODEL_H_