How to avoid controls flickering in a CDialog (MFC C++ )

user_12365764 0
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Hello i've been looking for a couple of days now how to avoid controls themselves from flickering in a CDialog.

I am using CMemDC and erasing the background to draw some basic shapes with GDI+

void CCustomDialog::OnPaint()
{
    CPaintDC pDC(this);
    CMemDC dc(&pDC);

    Gdiplus::Graphics graphics(dc.GetSafeHdc());

    CRect clip;
    dc.GetClipBox(&clip);
    dc.FillSolidRect(clip, GetSysColor(COLOR_WINDOW));

    DefWindowProc(WM_PAINT, (WPARAM)dc->m_hDC, (LPARAM)0);
    Gdiplus::Pen pen(Gdiplus::Color(150, 125, 255, 100), 5.0);
    graphics.DrawEllipse(&pen, 200, 50+m_interator, 100, 100);
}

This class inherits from CDialog and will then itself be a base class to other dialogs to control the "theme".

however when i invalidate and then update the window on a mouse move event

void CCustomDialog::OnMouseMove(UINT nFlags, CPoint point)
{
    m_interator++;
    Invalidate();
    UpdateWindow();
    CDialog::OnMouseMove(nFlags, point);
}

The Ellipse doesn't flicker at all but all the other buttons, labels and edit controls do.

I haven't found anything to avoid this and i myself do not know enough about MFC to avoid it.

Any ideas?

I was thinking maybe I can set the DC of the controls to be the same CMemDC, but i'm not sure how to do that yet, will post here if I figure it out.

gdi gdi+ mfc controls c++
1 Answers

You can set the style WS_CLIPCHILDREN in the dialog resource, for example:

IDD_STEP_DLG DIALOGEX 0, 0, 344, 215
// here:
STYLE DS_SETFONT | DS_FIXEDSYS | WS_MAXIMIZEBOX | WS_POPUP | WS_CLIPCHILDREN | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
    LTEXT           "Static",IDC_PREP_HISTOGRAM_PLACE,0,0,343,214,SS_NOTIFY | WS_TABSTOP
END
user_68685430
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