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Further discussions on flicker free drawing

, 23 May 2003 160.5K 50
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An article on how to solve flicker problems
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Introduction

This article aims to show some useful codes for solving flicker problems in CTreeCtrl, CListCtrl and GDI+. And it could be viewed as an extend of Keith Rule's great article "Flicker Free Drawing In MFC".

Background

The only background to this article is that you have read the great article of Keith Rule. Thanks him for his nice code. We will use the class CMemDC proposed by him.

CTreeCtrl

For a CTreeCtrl derived class, if we want to avoid flicker, we could carry out the following steps.

  • Add the file memdc.h in your project.
  • Add the line #include "memdc.h" to stdafx.h or the desired .h file.
  • Add a public CRect variable like CRect m_rectClient;
  • Add a windows message handler for WM_ERASEBKGND, WM_SIZE, and WM_PAINT.

Then we should add the code as following:

BOOL CTreeCtrl::OnEraseBkgnd(CDC* pDC) 
{
    // TODO: Add your message handler code here and/or call default
    UNUSED_ALWAYS(pDC);

    //return CTreeCtrl::OnEraseBkgnd(pDC);
    return TRUE;
}

void CTreeCtrl::OnSize(UINT nType, int cx, int cy) 
{
    CTreeCtrl::OnSize(nType, cx, cy);

    GetClientRect(m_rectClient);
}

void CTreeCtrl::OnPaint() 
{
    CPaintDC dc(this);

    // Paint to a memory device context to reduce screen flicker.
    CMemDC memDC(&dc, &m_rectClient);

    ......

    // Let the window do its default painting...
    CWnd::DefWindowProc( WM_PAINT, (WPARAM)memDC.m_hDC, 0 );
}

Then you would get flicker free effect.

CListCtrl

For a CListCtrl derived class, all of the procedures are the same expect the OnSize function should be modified as following to allow the CHeadCtrl (if in report model) to display:

void CListCtrl::OnSize(UINT nType, int cx, int cy) 
{
    CListCtrl::OnSize(nType, cx, cy);

    GetClientRect(m_rectClient);

    CHeaderCtrl* pHC;
    pHC = GetHeaderCtrl();
    if (pHC != NULL)
    {
        CRect rectHeader;
        pHC->GetItemRect( 0, &rectHeader );
        m_rectClient.top += rectHeader.bottom;
    }
}

Then you could get flicker free effect.

GDI+

I have found several articles talking about flicker free drawing in GDI+. However, I want to extend Keith Rule's code to do the same job and avoid to re-implement the double buffer mechanism with CashedBitmap. Thus I use the following method.

  • Add the file memdc.h in your project.
  • Add the line #include "memdc.h" to stdafx.h or the desired .h file.
  • Add a public CRect variable likeCRect m_rectClient; Add a windows message handler for WM_ERASEBKGND, WM_SIZE, and WM_PAINT.

Then we should add the code as following:

BOOL CView::OnEraseBkgnd(CDC* pDC) 
{
    // TODO: Add your message handler code here and/or call default
    UNUSED_ALWAYS(pDC);

    //return CView::OnEraseBkgnd(pDC);
    return TRUE;
}

void CView::OnSize(UINT nType, int cx, int cy) 
{
    CView::OnSize(nType, cx, cy);

    GetClientRect(m_rectClient);
}

void CView::OnPaint() 
{
    CPaintDC dc(this);

    // Paint to a memory device context to reduce screen flicker.
    CMemDC memDC(&dc, &m_rectClient);
    Graphics graphics(memDC);

    ......
}

Then you could get flicker free effect. This method could also do well in CScrollView. Ok, finally, there is still an interesting question left for you: which method will be faster, this method or the double buffer implemented by CashedBitmap?

History

  • Initial release 2003-05-24.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

TeleStar
China China
I am now a faculty in Engineering. But I am also a programmer who use VC from VC1.5 to VC8.0. However, now I prefer to use C# and VB.Net in my job.

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Comments and Discussions

 
GeneralGDI+ Pin
Alex Voronyansky26-Apr-09 12:19
memberAlex Voronyansky26-Apr-09 12:19 
QuestionHow to update listview ONLY when new data is avilable? Pin
method0079-May-07 14:58
membermethod0079-May-07 14:58 
GeneralWM_PAINT Pin
mark pinnuck3-Apr-07 12:46
membermark pinnuck3-Apr-07 12:46 
QuestionIneffective methods?? Pin
Douglas R. Keesler29-Dec-06 18:54
memberDouglas R. Keesler29-Dec-06 18:54 
GeneralGDI+ with CMemDC slow ! Pin
Lord Darius28-May-06 1:00
memberLord Darius28-May-06 1:00 
GeneralRe: GDI+ with CMemDC slow ! Pin
TeleStar6-Sep-06 22:33
memberTeleStar6-Sep-06 22:33 
QuestionFlickers with WS_EX_LAYOUTRTL Pin
_Stilgar_30-Mar-06 21:16
member_Stilgar_30-Mar-06 21:16 
AnswerRe: Flickers with WS_EX_LAYOUTRTL Pin
TeleStar6-Sep-06 22:27
memberTeleStar6-Sep-06 22:27 
Generalwhere is the original article Pin
ivan françois17-Jan-06 7:17
memberivan françois17-Jan-06 7:17 
Generalhttp://www.codeproject.com/gdi/flickerfree.asp Pin
TeleStar27-Jan-06 13:06
memberTeleStar27-Jan-06 13:06 
QuestionHow to use in a dialog-based app? Pin
Hawks22-Aug-05 7:52
memberHawks22-Aug-05 7:52 
Answerwhy need to use CMemDC in a dialog-based app? Pin
TeleStar22-Aug-05 18:03
memberTeleStar22-Aug-05 18:03 
GeneralBetter code for CTreeCtrl Pin
Adam Tegen16-Aug-04 6:12
sussAdam Tegen16-Aug-04 6:12 
GeneralBetter code for CListCtrl Pin
Adam Tegen16-Aug-04 5:59
sussAdam Tegen16-Aug-04 5:59 
Generalyou are right, and I think that's what they do in BCG and XTPro Pin
AI200417-Aug-04 6:44
memberAI200417-Aug-04 6:44 
GeneralRe: Better code for CListCtrl Pin
Anonymous4-Mar-05 11:18
sussAnonymous4-Mar-05 11:18 
GeneralAwesoma powa!:) Pin
abloy25-Aug-07 4:01
memberabloy25-Aug-07 4:01 
GeneralStop Flicker Alternative Pin
C@ssidy15-Apr-09 5:09
memberC@ssidy15-Apr-09 5:09 
QuestionReduce flicker in ListView ? Pin
_skidrow_vn_11-Nov-03 7:34
member_skidrow_vn_11-Nov-03 7:34 
AnswerRe: Reduce flicker in ListView ? Pin
xxxyyyzzz1-Dec-03 20:01
memberxxxyyyzzz1-Dec-03 20:01 
AnswerRe: Reduce flicker in ListView ? Pin
Endemoniada24-Mar-04 15:49
memberEndemoniada24-Mar-04 15:49 
GeneralIf you use SetRedraw(), Pin
xxxyyyzzz26-Mar-04 10:38
memberxxxyyyzzz26-Mar-04 10:38 
GeneralPossible to use with owner draw List Control Pin
tlee4-Nov-03 10:17
membertlee4-Nov-03 10:17 
GeneralRe: Possible to use with owner draw List Control Pin
xxxyyyzzz4-Nov-03 11:32
memberxxxyyyzzz4-Nov-03 11:32 
GeneralRe: Possible to use with owner draw List Control Pin
tlee4-Nov-03 12:10
membertlee4-Nov-03 12:10 

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