--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailuis/uicomponents/inc/fstreeiterator.h	Thu Dec 17 08:39:21 2009 +0200
@@ -0,0 +1,180 @@
+/*
+* Copyright (c) 2007 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:  Iterator class for traversing the tree structure.
+*
+*/
+
+
+#ifndef T_FSTREEITERATOR_H
+#define T_FSTREEITERATOR_H
+
+
+#include <e32def.h>
+
+#include "fstreelistconstants.h"
+
+
+class CFsTree;
+class CFsTreeItem;
+class CFsTreeNode;
+
+
+const TUint KFsTreeIteratorNullFlag = 0x00;
+
+/**  Flag indicating that the content of collapsed nodes is not to be
+     included in the iteration sequence. */
+const TUint KFsTreeIteratorSkipCollapsedFlag = 0x01;
+
+const TUint KFsTreeIteratorSkipHiddenFlag = 0x02;
+
+
+NONSHARABLE_CLASS( TFsTreeIterator )
+    {
+
+    //friend class CFsTree;
+
+public:
+
+    /**
+     * Copy constructor.
+     *
+     * @param aIterator Copied iterator.
+     */
+    
+    TFsTreeIterator( const TFsTreeIterator& aIterator );
+    
+    /**
+     * C++ constructor.
+     *
+     * @param aRoot Root node for the iterated tree (or subtree).
+     */
+    TFsTreeIterator( CFsTreeNode* aRoot, CFsTree* aTree,
+                   CFsTreeItem* aCurrent,
+                   const TUint aFlags = KFsTreeIteratorNullFlag);
+        
+    /**
+     * Assignment operator.
+     *
+     * @param aIterator Iterator.
+     */
+    TFsTreeIterator& operator=( const TFsTreeIterator& aIterator );
+    
+    /**
+     * Returns whether the iterator has next tree item.
+     *
+     * @return @c ETrue, if there is a next item.
+     */
+    TBool HasNext();
+
+    /**
+     * Returns an identifier to the next tree item. The returned value is @c 
+     * KFsTreeNoneID,
+     * when there is no more items. This changes also the iterator to point
+     * to the returned item.
+     *
+     * @return Identifier of the next tree item.
+     */
+    TFsTreeItemId Next();
+    
+    /**
+     * Returns whether the iterator has previous tree item.
+     *
+     * @return @c ETrue, if there is a previous item.
+     */
+    TBool HasPrevious();
+
+    /**
+     * Returns an identifier to the previous tree item. The returned value is
+     * @c KFsTreeNoneID, if there is no previous tree item. This changes also 
+     * the iterator to point to the returned item. 
+     *
+     * @return Identifier to the previous tree item.
+     */
+    TFsTreeItemId Previous();
+    
+    /**
+     * Returns an identifier to the current tree item. The returned value is
+     * @c KFsTreeNoneID, if there is no current tree item.
+     *
+     * @return Identifier to the current tree item.
+     */
+    TFsTreeItemId Current() const;
+
+    /**
+     * Return an identifier to the first item in the sequence.
+     *
+     * @return An identifier of the first item.
+     */
+    TFsTreeItemId First();
+    
+    /**
+     * Returns an identifier to the last item in the sequence.
+     *
+     * @return An identifier of the last item.
+     */ 
+    TFsTreeItemId Last();
+
+private:
+
+    /**
+     * Returns pointer to the next tree item.
+     *
+     * @return Pointer to the next tree item. @c NULL, if the next item is not
+     *      found.
+     */
+    CFsTreeItem* FindNext();
+    
+    /**
+     * Returns pointer ot the previous tree item.
+     *
+     * @return Pointer to the previous tree item. @c NULL, if previous item is
+     *      not found.
+     */
+    CFsTreeItem* FindPrevious();
+
+private: // data
+
+    /**
+     * Tree to iterate in.
+     */
+    CFsTree* iTree;
+
+    /**
+     * Current item.
+     */
+    CFsTreeItem* iCurrent;
+
+    /**
+     * Root of the tree.
+     */
+    CFsTreeNode* iRoot;
+
+    /**
+     * Next item. Contains a pointer to the cached next item.
+     */
+    CFsTreeItem* iNext;
+
+    /**
+     * Previous item. Contains a pointer to the cached previous item.
+     */
+    CFsTreeItem* iPrevious;
+
+    /**
+     * Flags for the iterator.
+     */
+    TUint iFlags;
+      
+    };
+ 
+#endif // T_FSTREEITERATOR_H