Knowledge Base Nr: 00174 OwnerDrawListBox2.cpp - http://www.swe-kaiser.de

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MFC: Ownerdraw Listbox (mehrzeiligen Items, verschiedenfarbige Texte, verschiedene Fonts)
ModifyString()-Funktion für flackerfreies Update (z.B. Uhrzeit anzeigen)

  
//in h-File der Dialog-Klasse CListBox ersetzen durch COwnerDrawListBox2
//
// Resource: Property settings:
// ------------------
// Has Strings = Yes
// Owner Draw = variable
// Want key input = Yes
// No integral height = YES
// Notify = YES

class COwnerDrawListBox2 : public CListBox
{
protected:
    CStringArray m_arHead;
    CStringArray m_arItems;
    CDWordArray m_arCref;
    CWordArray m_arX;
    CWordArray m_arY;
    CWordArray m_arFSize;

    int m_nMaxHeight;
    COLORREF m_crBackground;
    COLORREF m_crSelection;

    virtual BOOL FormatAndDrawItem(CDC *pDC, int nIndex, LPRECT lpRect, bool bSelected);
    virtual BOOL FormatAndDrawString(CDC *pDC, LPCTSTR lpszStr, LPRECT lpRect, bool bSelected);

public:
    COwnerDrawListBox2();
    virtual ~COwnerDrawListBox2();

    void Settings(int nMaxHeight
                , COLORREF crBackground = RGB(88,88,88)
                , COLORREF crSelection = RGB(33,33,33));

    //customize the items
    void ResetInfo();
    void AddItemInfo(LPCSTR lpszHead, COLORREF cref, WORD nX, WORD nY, int nFontSize = 8);

    //handle items
    int InsertString(int nIndex, LPCTSTR lpszItem);
    int AddString( LPCTSTR lpszItem );
    int ModifyString(int nIndex, LPCTSTR lpszItem);
    int DeleteString(int nIndex);
    void ResetContent();

    //manage entries
    int LoadFromFile(LPCSTR fileName); //0 = success
    void Clone(COwnerDrawListBox2* pSource, BOOL bInsertHeader);


    // Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(COwnerDrawListBox2)
    public:
    virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
    virtual int  CompareItem(LPCOMPAREITEMSTRUCT lpCompareItemStruct);
    virtual void DeleteItem(LPDELETEITEMSTRUCT lpDeleteItemStruct);
    virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);
    //}}AFX_VIRTUAL
...
};


void COwnerDrawListBox2::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
    //TRACE("id:%d action:%x state:%x \n", lpDIS->itemID, lpDIS->itemAction, lpDIS->itemState);
    if (lpDIS->itemID < 0)
        return;

    CDC *pDC = CDC::FromHandle(lpDIS->hDC);

    enum  DRAWMODES {M_NONE, M_NORMAL, M_SELECTED } nDrawMode = M_NONE;

    if (lpDIS->itemAction & ODA_DRAWENTIRE)
        nDrawMode = M_NORMAL;

    if (!(lpDIS->itemState & ODS_SELECTED) &&
        (lpDIS->itemAction & ODA_SELECT))
        nDrawMode = M_NORMAL;

    if ((lpDIS->itemState & ODS_SELECTED) &&
        (lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
        nDrawMode = M_SELECTED;

    LPRECT lpRect = &(lpDIS->rcItem);

    CBrush brush;

    switch(nDrawMode)
    {
        case M_NORMAL:
            //pDC->BitBlt(0, lpRect->top, lpRect->right, lpRect->bottom-lpRect->top, NULL, 0, 0, WHITENESS); //   DSTINVERT);
            brush.CreateSolidBrush(m_crBackground);
            pDC->FillRect(lpRect, &brush);
            break;

        case M_SELECTED:  //show selection as rectangle
            //pDC->Rectangle(lpRect->left+1, lpRect->top+1, lpRect->right-1, lpRect->bottom-1);
            //pDC->BitBlt(0, lpRect->top, lpRect->right, lpRect->bottom-lpRect->top, NULL, 0, 0, BLACKNESS); //   DSTINVERT);
            brush.CreateSolidBrush(m_crSelection);
            pDC->FillRect(lpRect, &brush);
            break;
    }

    if (nDrawMode != M_NONE)
    {
        BOOL bSucc = FormatAndDrawItem(pDC, lpDIS->itemID, lpRect, (nDrawMode == M_SELECTED));
        ASSERT(bSucc);
    }

    if ((lpDIS->itemState & ODS_FOCUS)  || (lpDIS->itemAction & ODA_FOCUS))
    {
        // Item has got the focus
        pDC->DrawFocusRect(lpRect);

        /*
        brush.CreateSolidBrush(RGB(0,255,0));

        int nBorder = 3;
        CRect rect;

        rect.SetRect(lpRect->left, lpRect->top, lpRect->right, lpRect->bottom);
        pDC->FillRect(&rect, &brush);
        */
    }
}


BOOL COwnerDrawListBox2::FormatAndDrawString(CDC *pDC, LPCTSTR lpszStr, LPRECT lpRect, bool bSelected)
{
    CString str(lpszStr);

    int nPart = 0;
    CString strPart;

    int nMinSize = m_arHead.GetSize();

    while (nPart < nMinSize)
    {
        int nPos = str.Find('\t');

        if (nPos >= 0)
            strPart = str.Left(nPos);
        else
            strPart = str;

        int x = m_arX[nPart];
        int y = m_arY[nPart] + ROWOFFSET;
        ASSERT(m_arY[nPart] <= m_nMaxHeight);

        int nFSize = m_arFSize[nPart];;
        CFont font;
        font.CreatePointFont(nFSize*10, "Times New Roman");

        pDC->SelectObject(&font);
        if (bSelected)
            pDC->SetBkColor(m_crSelection);
        else
            pDC->SetBkColor(m_crBackground);
        pDC->SetTextColor(m_arCref[nPart]);
        pDC->ExtTextOut(x,  // x-coordinate of reference point
                        lpRect->top + y,    // y-coordinate of reference point
                        ETO_CLIPPED   , // ETO_CLIPPED | ETO_OPAQUE,    // text-output options
                        lpRect, // optional clipping and/or opaquing rectangle
                        strPart,    // points to string
                        NULL ); // pointer to array of intercharacter spacing values

        if (nPos < 0)
            break;

        str = str.Mid(nPos+1);
        nPart++;
        ASSERT(nPart < nMinSize+1);
    }

    return TRUE;
}

BOOL COwnerDrawListBox2::FormatAndDrawItem(CDC *pDC, int nIndex, LPRECT lpRect, bool bSelected)
{
    CString str;

    //GetText(nIndex, str);
    str = m_arItems.GetAt(nIndex);

    BOOL bSucc = FormatAndDrawString(pDC, str, lpRect, bSelected);

    return bSucc;
}