textinput/peninputcommonctrls/src/peninputdropdownlist/peninputcandidate.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:02:04 +0200
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/*
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* Copyright (c) 2002-2005 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:   candidate stands for every cell in drop down list
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*
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*/
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#include <gdi.h>
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#include <e32base.h>
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#include <w32std.h>
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#include <biditext.h> 
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#include "peninputcandidate.h"
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#include "peninputdropdownlist.h"
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_LIT(KEllipsis, "\x2026");
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// ======== MEMBER FUNCTIONS ========
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// Implementation of Class CCandidate 
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CCandidate* CCandidate::NewL(const TDesC& aString,
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                             MFepCtrlDropdownListContext* aOwner)
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    {
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    CCandidate* self = new (ELeave) CCandidate(aString, aOwner);  // Q: is here will call ctor of base class?
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    CleanupStack::PushL(self);
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    self->ConstructL(); 
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    CleanupStack::Pop();
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    return self;
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    }
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void CCandidate::ConstructL()
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    {
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    iDisplayText = iCandidate.AllocL();
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::CCandidate
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// construct function
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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CCandidate::CCandidate(const TDesC& aString, MFepCtrlDropdownListContext* aOwner)
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: iCandidate(aString),iBaselineOffset(0), iOwner(aOwner)
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    {
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::~CCandidate
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// destructor function
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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CCandidate::~CCandidate() 
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    {
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    delete iDisplayText;
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::GetCandidate
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// get candidate string
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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const TDesC& CCandidate::GetCandidate()
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    {
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    return iCandidate;
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::GetRect
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// get rect of the candidate
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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const TRect& CCandidate::GetRect() const
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    {
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    return iRect;
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::Move
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// move rect of the candidate
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CCandidate::Move(const TPoint& aOffsetPoint)
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    {
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    iRect.Move(aOffsetPoint);
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    }
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// -----------------------------------------------------------------------------
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// CCandidate::SetPosition
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// set position for the candidate
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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TInt CCandidate::SetPositionL(const TPoint& aLeftTopPosition, 
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                              TInt aWidthForOneUnit, 
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                              TInt aHeight, 
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                              const CFont* aTextFont,
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                              TInt aCellHorizontalMargin)
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    {
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    iTextFont = aTextFont;
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    // Calculate base line offset
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    iBaselineOffset = aHeight/2 + aTextFont->AscentInPixels()/2 ; 
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    // Calculate the cell for the candidate
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    //const TInt cellCount = CalculateCells(aWidthForOneUnit, aTextFont);
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    const TInt cellCount = CalculateDisplayTextL(aWidthForOneUnit, aTextFont, iOwner->GetColNum());
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   123
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    // modified by txin
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   125
    // original:
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   126
    /*
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    iRect.iBr = aLeftTopPosition;
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    iRect.SetRect(aLeftTopPosition, 
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                  TSize(cellCount * aWidthForOneUnit + (cellCount - 1) * aCellHorizontalMargin,
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                        aHeight));
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    */
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    // if owner's horizontal direction is RToL, then aLeftTopPosition actually mean RightTop pos
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    TInt candHDir = iOwner->CandHDirection();
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    TSize candSize = TSize(cellCount * aWidthForOneUnit + (cellCount - 1) * aCellHorizontalMargin,
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                           aHeight);
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    (candHDir == CFepCtrlDropdownList::ECandFromLToR) ?
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   138
        iRect.SetRect(aLeftTopPosition, candSize) : 
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        iRect.SetRect(TPoint(aLeftTopPosition.iX - candSize.iWidth, aLeftTopPosition.iY), candSize);
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    // end modify
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   141
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    return cellCount;
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   143
    }
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// -----------------------------------------------------------------------------
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// CCandidate::DrawText
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// draw text of the candidate
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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void CCandidate::DrawText(CFbsBitGc& aGc, const CGraphicsContext::TTextAlign aAlignment, 
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                          const TInt aTextMargin, TRgb aTextColor, 
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                          TRgb aSpecialTextColor, const TDesC& aFixedText)
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    {
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   156
    aGc.SetBrushStyle(CGraphicsContext::ENullBrush);
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   157
    if ( aFixedText.Length() == 0 )    
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   158
        {
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   159
        // If fixed text has no any data
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        aGc.SetPenColor(aTextColor);
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   161
        if(TBidiText::TextDirectionality( *iDisplayText ) == TBidiText:: ERightToLeft)
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   162
            {
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            // If find the fixed text in the candidate and the index is equal to 0
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            TInt posX = 0;
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   165
            if(!iTextFont)
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                {
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                iTextFont = iOwner->GetFont();
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                }
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   169
            if ( aAlignment == CGraphicsContext::ECenter )
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                {
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                posX = iRect.iTl.iX + 
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                       (iRect.Width() - iTextFont->TextWidthInPixels(*iDisplayText)) / 2;
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                }
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            else  if ( aAlignment == CGraphicsContext::ELeft )
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   175
                {
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                posX = iRect.iTl.iX + aTextMargin;
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   177
                }
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            else if ( aAlignment == CGraphicsContext::ERight )
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   179
                {
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                posX = iRect.iTl.iX + iRect.Width() - 
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                       iTextFont->TextWidthInPixels(*iDisplayText) - aTextMargin;
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   182
                }
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   183
            
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   184
            CGraphicsContext::TDrawTextExtendedParam param;
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            param.iParRightToLeft = ETrue;
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            aGc.DrawTextExtended(*iDisplayText, TPoint(posX,iRect.iTl.iY + iBaselineOffset), param);            
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   187
            }
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   188
        else
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   189
            {
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   190
            aGc.DrawText( *iDisplayText, iRect, iBaselineOffset, aAlignment);
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   191
            }
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   192
        }
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   193
    else
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   194
        {
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   195
        if ( iCandidate.Find(aFixedText) == 0 )
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   196
            {
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   197
            // If find the fixed text in the candidate and the index is equal to 0
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   198
            TInt posX = 0;
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   199
            if(!iTextFont)
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   200
                {
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   201
                iTextFont = iOwner->GetFont();
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   202
                }            
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   203
            if ( aAlignment == CGraphicsContext::ECenter )
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   204
                {
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   205
                posX = iRect.iTl.iX + 
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   206
                       (iRect.Width() - iTextFont->TextWidthInPixels(iCandidate)) / 2;
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   207
                }
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   208
            else  if ( aAlignment == CGraphicsContext::ELeft )
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parents:
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   209
                {
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                posX = iRect.iTl.iX + aTextMargin;
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   211
                }
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            else if ( aAlignment == CGraphicsContext::ERight )
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   213
                {
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   214
                posX = iRect.iTl.iX + iRect.Width() - 
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   215
                       iTextFont->TextWidthInPixels(iCandidate) - aTextMargin;
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   216
                }
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parents:
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   217
            
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   218
            
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   219
            // Draw Fixed text
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            aGc.SetPenColor(aTextColor);
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   221
            aGc.DrawText(aFixedText, TPoint(posX,iRect.iTl.iY + iBaselineOffset));
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parents:
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   222
            
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   223
            // Snatch the special text
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   224
            TPtrC buf = iCandidate.Mid(aFixedText.Length());      
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parents:
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   225
            
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   226
            // Set X position for the special text
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            posX = posX + iTextFont->TextWidthInPixels(aFixedText);
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            // Draw special text
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            aGc.SetPenColor(aSpecialTextColor);
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            aGc.DrawText(buf, TPoint(posX, iRect.iTl.iY + iBaselineOffset));
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            }
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        else
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            {
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            aGc.SetPenColor(aTextColor);
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            if(TBidiText::TextDirectionality( iCandidate ) == TBidiText:: ERightToLeft)
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                {
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                // If find the fixed text in the candidate and the index is equal to 0
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                TInt posX = 0;
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                if(!iTextFont)
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                    {
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                    iTextFont = iOwner->GetFont();
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                    }                
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                if ( aAlignment == CGraphicsContext::ECenter )
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                    {
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                    posX = iRect.iTl.iX + 
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                           (iRect.Width() - iTextFont->TextWidthInPixels(iCandidate)) / 2;
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                    }
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                else  if ( aAlignment == CGraphicsContext::ELeft )
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                    {
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                    posX = iRect.iTl.iX + aTextMargin;
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                    }
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                else if ( aAlignment == CGraphicsContext::ERight )
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                    {
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   255
                    posX = iRect.iTl.iX + iRect.Width() - 
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                           iTextFont->TextWidthInPixels(iCandidate) - aTextMargin;
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                    }
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   258
                
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                CGraphicsContext::TDrawTextExtendedParam param;
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                param.iParRightToLeft = ETrue;
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   261
                aGc.DrawTextExtended(iCandidate, TPoint(posX,iRect.iTl.iY + iBaselineOffset), param);            
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                }
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   263
            else
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   264
                {
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   265
                aGc.DrawText( iCandidate, iRect, iBaselineOffset, CGraphicsContext::ECenter);
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   266
                }
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            }
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   268
        }
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   269
    }
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   270
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// -----------------------------------------------------------------------------
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// CCandidate::CalculateCells
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// calculate the cell for the candidate
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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TInt CCandidate::CalculateCells(const TInt aWidthForOneUnit, 
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                                const CFont* aTextFont,
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                                const TDesC& aText)
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   280
    {
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   281
    const TInt width = aTextFont->TextWidthInPixels(aText) + 2 * iOwner->GetTextMargin();
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   282
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   283
    if (width <= aWidthForOneUnit)
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   284
        {
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        return 1;
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   286
        }
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   287
    
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   288
    return (width + aWidthForOneUnit + 
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   289
     iOwner->GetCellHorizontalMargin() - 1)/(aWidthForOneUnit + iOwner->GetCellHorizontalMargin());
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   290
    }
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   291
    
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   292
TInt CCandidate::CalculateDisplayTextL(const TInt aWidthForOneUnit, 
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   293
                                       const CFont* aTextFont,
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   294
                                       TInt aColNum)
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   295
    {
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   296
    TInt cellcnt = CalculateCells(aWidthForOneUnit, aTextFont, *iDisplayText);
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   297
    
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   298
    if (cellcnt <= aColNum)
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parents:
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   299
        {
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   300
        return cellcnt;
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diff changeset
   301
        }
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parents:
diff changeset
   302
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   303
    TPtr ptr = iDisplayText->Des();
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parents:
diff changeset
   304
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   305
    if (iOwner->CandTruncateType() == CFepCtrlDropdownList::ECandTruncateFromBeginning)
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parents:
diff changeset
   306
        {
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parents:
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   307
        while (cellcnt > aColNum && ptr.Length() > 0)
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parents:
diff changeset
   308
            {
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   309
            ptr.Delete(0, 1);
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   310
            cellcnt = CalculateCells(aWidthForOneUnit, aTextFont, ptr);
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parents:
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   311
            }
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parents:
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   312
        }
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parents:
diff changeset
   313
    else if (iOwner->CandTruncateType() == CFepCtrlDropdownList::ECandTruncateAsEllipsis)
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parents:
diff changeset
   314
        {
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parents:
diff changeset
   315
        while (cellcnt > aColNum && ptr.Length() > 1)
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parents:
diff changeset
   316
            {
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parents:
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   317
            ptr.Delete(ptr.Length()-2, 2);
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parents:
diff changeset
   318
            ptr.Append(KEllipsis);
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parents:
diff changeset
   319
            cellcnt = CalculateCells(aWidthForOneUnit, aTextFont, ptr);
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parents:
diff changeset
   320
            }
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parents:
diff changeset
   321
        }
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parents:
diff changeset
   322
    else if (iOwner->CandTruncateType() == CFepCtrlDropdownList::ECandTruncateFromEnd)
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parents:
diff changeset
   323
        {
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parents:
diff changeset
   324
        while (cellcnt > aColNum && ptr.Length() > 0)
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parents:
diff changeset
   325
            {
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parents:
diff changeset
   326
            ptr.Delete(ptr.Length()-1, 1);
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parents:
diff changeset
   327
            cellcnt = CalculateCells(aWidthForOneUnit, aTextFont, ptr);
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parents:
diff changeset
   328
            }
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diff changeset
   329
        }
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parents:
diff changeset
   330
        
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diff changeset
   331
    return cellcnt;    
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parents:
diff changeset
   332
    }
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parents:
diff changeset
   333
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parents:
diff changeset
   334
// End Of File