emailuis/uicomponents/src/fstreeiterator.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:08:26 +0200
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Freestyle tree iterator implementation
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*
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*/
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#include "emailtrace.h"
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#include <e32const.h>
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#include "fstreeiterator.h"
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#include "fstreeitem.h"
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#include "fstreenode.h"
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#include "fstreenodevisualizer.h"
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#include "fstree.h"
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#include "fsgenericpanic.h"
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/** Bitmask specifying which flags can be given as parameters. */
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const TUint KAllowedParameters = KFsTreeIteratorSkipCollapsedFlag |
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                                 KFsTreeIteratorSkipHiddenFlag;
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/** Flag indicating that the next item is stored in the iterator. */ 
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const TUint KNextItemCached = 0x8000;
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/** Flag indicating that the previous item is stored in the iterator. */
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const TUint KPreviousItemCached = 0x4000;
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// ======== MEMBER FUNCTIONS ========
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// ---------------------------------------------------------------------------
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// Copy constructor.
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// ---------------------------------------------------------------------------
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//
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TFsTreeIterator::TFsTreeIterator( const TFsTreeIterator& aIterator )
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    : iTree(aIterator.iTree),
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      iCurrent( aIterator.iCurrent ),
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      iRoot( aIterator.iRoot ),
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      iNext( aIterator.iNext ),
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      iPrevious( aIterator.iPrevious ),
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      iFlags( aIterator.iFlags ) 
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    {
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    FUNC_LOG;
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    }
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// ---------------------------------------------------------------------------
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// C++ constructor.
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// ---------------------------------------------------------------------------
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//
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TFsTreeIterator::TFsTreeIterator( CFsTreeNode* aRoot, CFsTree* aTree,
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                                  CFsTreeItem* aCurrent, const TUint aFlags )
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    : iTree(aTree),
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      iCurrent( aCurrent ),
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      iRoot( aRoot ),
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      iNext( NULL ),
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      iPrevious( NULL ),
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      iFlags( aFlags & KAllowedParameters )     
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    {
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    FUNC_LOG;
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    }
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// ---------------------------------------------------------------------------
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// Returns whether the iterator has next tree item.
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// ---------------------------------------------------------------------------
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//
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TBool TFsTreeIterator::HasNext()
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    {
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    FUNC_LOG;
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    return FindNext() ? ETrue : EFalse;
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    }
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// ---------------------------------------------------------------------------
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// Returns a pointer to the next tree item.
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// ---------------------------------------------------------------------------
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//
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TFsTreeItemId TFsTreeIterator::Next()
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    {
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    FUNC_LOG;
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    CFsTreeItem* next = FindNext();
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    iPrevious = iCurrent;
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    iCurrent = next;
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    iFlags = ( iFlags & KAllowedParameters ) | KPreviousItemCached;
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    return iTree->Id(next);  
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    }
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// ---------------------------------------------------------------------------
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// Returns whether the iterator has previous tree item.
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// ---------------------------------------------------------------------------
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//
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TBool TFsTreeIterator::HasPrevious()
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    {
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    FUNC_LOG;
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    return FindPrevious() ? ETrue : EFalse;
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    }
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// ---------------------------------------------------------------------------
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// Returns an id of the previous tree item.
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// ---------------------------------------------------------------------------
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//
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TFsTreeItemId TFsTreeIterator::Previous()
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    {
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    FUNC_LOG;
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    CFsTreeItem* previous = FindPrevious();
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    iNext = iCurrent;
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    iCurrent = previous;
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    iFlags = ( iFlags & KAllowedParameters ) | KNextItemCached;
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    return iTree->Id( previous );
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    }
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// ---------------------------------------------------------------------------
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// Returns an id of the current tree item.
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// ---------------------------------------------------------------------------
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//
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TFsTreeItemId TFsTreeIterator::Current() const
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    {
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    FUNC_LOG;
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    return iTree->Id(iCurrent);
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    }
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// ---------------------------------------------------------------------------
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// Returns a pointer to the first item in the sequence.
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// ---------------------------------------------------------------------------
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//
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TFsTreeItemId TFsTreeIterator::First()
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    {
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    FUNC_LOG;
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    CFsTreeItem* first = NULL;
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    if ( iRoot->CountChildren() > 0 )
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        {
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        first = iRoot->Child( 0 );
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        }
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    else
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        {
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        first = iRoot;
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        }
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    return iTree->Id( first );
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    }
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// ---------------------------------------------------------------------------
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// Returns pointer to the las item in the sequence.
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// ---------------------------------------------------------------------------
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//
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TFsTreeItemId TFsTreeIterator::Last()
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    {
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    FUNC_LOG;
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    CFsTreeItem* last = NULL;
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    CFsTreeNode* node = iRoot->Node();
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    CFsTreeItem* item = iRoot; 
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    TInt index = 0;
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    TBool found = EFalse;
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   174
    while (!found && (node!=iRoot->Parent()))
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        {
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   176
        node = item->Node();
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   177
        
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   178
        while (node && node->CountChildren() &&
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   179
                    
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              (node->NodeVisualizer()->IsExpanded() || !(iFlags & KFsTreeIteratorSkipCollapsedFlag)) &&  
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             !(node->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag)))
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            {
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   184
            index = node->CountChildren()-1;
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            item = node->Child(index);
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            node = item->Node();
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   187
            }
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   188
        
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   189
        if (!(item->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag))
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   190
                && (iTree->Id(item)!=KFsTreeRootID) )
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   191
            
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            {
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   193
            last = item;
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   194
            found = ETrue;
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   195
            }
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   196
        else
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   197
            {
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   198
            node = item->Parent();
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   199
            if (node)
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                {
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   201
                index = node->Index(item);
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   202
                if (index>0)
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   203
                    {
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                    item = node->Child(--index);
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   205
                    }
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   206
                else
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                    {
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                    item = node;
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   209
                    node = item->Parent();
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   210
                    }
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   211
                }
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   212
            }
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   213
        }
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   214
    
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   215
    return iTree->Id(last);
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   216
    }
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   217
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// ---------------------------------------------------------------------------
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// Assignment operator.
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// ---------------------------------------------------------------------------
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   221
//
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TFsTreeIterator& TFsTreeIterator::operator=(const TFsTreeIterator& aIterator)
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    {
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   224
    FUNC_LOG;
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    iTree = aIterator.iTree;
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    iCurrent = aIterator.iCurrent;
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   227
    iRoot = aIterator.iRoot;
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    iNext = aIterator.iNext;
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   229
    iPrevious = aIterator.iPrevious;
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   230
    iFlags = aIterator.iFlags;  
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   231
    
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   232
    return *this;
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   233
    }
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   234
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// ---------------------------------------------------------------------------
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   236
// Returns pointer to the next tree item.
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// ---------------------------------------------------------------------------
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//
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CFsTreeItem* TFsTreeIterator::FindNext()
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    {
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    FUNC_LOG;
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    CFsTreeItem* next = NULL;
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   243
    if ( iFlags & KNextItemCached )
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        {
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        next = iNext;
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        }
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    else
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        {
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        CFsTreeItem* item = iCurrent;
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        CFsTreeNode* node = item->Node();
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        TBool found = EFalse;
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        TInt index = 0;
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   254
        if  (node && node->CountChildren() &&
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            (node->NodeVisualizer()->IsExpanded() || !(iFlags & KFsTreeIteratorSkipCollapsedFlag)) &&  
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            !(node->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag)))
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            {
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            index = 0;
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            item = node->Child(index);
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            }
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        else
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   264
            {
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            if (item!=iRoot)
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   266
                {
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                node = item->Parent();
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                index = node->Index(item) + 1;
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   269
                }
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   270
            else
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                {
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                found = ETrue;
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   273
                }
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   274
            }
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parents:
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        while (!found && (node!=iRoot->Parent()))
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            {
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            if (index < node->CountChildren())
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                {
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                item = node->Child(index);
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                if (!(item->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag)))
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                    {
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                    found = ETrue;
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                    next = item;
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   285
                    }
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   286
                }
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            else
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parents:
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                {
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                item = node;
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                node = item->Parent();
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   291
                }
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parents:
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   292
            
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   293
            if (node)
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parents:
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   294
                {
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   295
                index = node->Index(item) + 1;
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parents:
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   296
                }
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   297
            }
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parents:
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   298
        
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   299
        iNext = next;
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   300
        iFlags |= KNextItemCached;
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   301
        }
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   302
    return next;
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   303
    }
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parents:
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   304
    
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parents:
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   305
// ---------------------------------------------------------------------------
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// Returns pointer ot the previous tree item.
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   307
// ---------------------------------------------------------------------------
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   308
//
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   309
CFsTreeItem* TFsTreeIterator::FindPrevious()
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parents:
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   310
    {
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   311
    FUNC_LOG;
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   312
    CFsTreeItem* previous = NULL;
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   313
    if ( iFlags & KPreviousItemCached )
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parents:
diff changeset
   314
        {
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   315
        previous = iPrevious;
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parents:
diff changeset
   316
        }
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parents:
diff changeset
   317
    else if ( iCurrent )
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parents:
diff changeset
   318
        {
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parents:
diff changeset
   319
        CFsTreeItem* item = iCurrent;
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parents:
diff changeset
   320
        CFsTreeNode* node = item->Parent();
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parents:
diff changeset
   321
        TInt index = 0;
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parents:
diff changeset
   322
        
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parents:
diff changeset
   323
        TBool found = EFalse;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   324
        
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   325
        while (!found && (node!=iRoot->Parent()))
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   326
            {
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parents:
diff changeset
   327
            index = node->Index(item);
8466d47a6819 Revision: 200949
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parents:
diff changeset
   328
            if (index>0)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   329
                {
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parents:
diff changeset
   330
                item = node->Child(--index);
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   331
                node = item->Node();
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parents:
diff changeset
   332
                
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   333
                //previous is a node so dig in deeply
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   334
                while (node && node->CountChildren() &&
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   335
                        
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   336
                     (node->NodeVisualizer()->IsExpanded() || !(iFlags & KFsTreeIteratorSkipCollapsedFlag)) &&  
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   337
                        
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   338
                     !(node->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag)))
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   339
                    {
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   340
                    index = node->CountChildren()-1;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   341
                    item = node->Child(index);
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   342
                    node = item->Node();
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   343
                    }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   344
                }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   345
            else
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   346
                {
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   347
                //index == 0
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   348
                item = node;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
                node = item->Parent();
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
                }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
            if (!(item->ItemVisualizer()->IsHidden() && (iFlags & KFsTreeIteratorSkipHiddenFlag)) &&
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
                    (iTree->Id(item) != KFsTreeRootID))
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
                {
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
                found = ETrue;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
                previous = item;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
                }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
            else
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
                {
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
                node = item->Parent();
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
                }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
            }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
        
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
        iPrevious = previous;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
        iFlags |= KPreviousItemCached;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
        }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
        
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
    return previous;
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
    }
8466d47a6819 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370