Knowledge Base Nr: 00116 VfWdraw.cpp - http://www.swe-kaiser.de

MFC: In einem Dialog in ein 'Video for Windows'-Fenster malen.
OnMouseMove(), OnLButtonUp(), OnLButtonDown funktionieren in diesem Fall nicht für ein FRAME-Control.

  
############### RC-file:
...
    CONTROL         "",IDC_FRAME,"Static",SS_BLACKFRAME | SS_NOTIFY,34,7,200,
                    139
...
    POPUP "&Alarm"
    BEGIN
        MENUITEM "&linkes/oberes Eck",          ID_ALARM_LINKSOBEN
        MENUITEM "&rechtes/unteres Eck",        ID_ALARM_RECHTSUNTEN
    END
...
############### H-file:
...
  RECT m_rAlarmZone:
...
############### CPP-file:
...
  ON_COMMAND(ID_ALARM_LINKSOBEN, OnAlarmLinksoben)
  ON_COMMAND(ID_ALARM_RECHTSUNTEN, OnAlarmRechtsunten)
...

void CVideoServerView::OnInitialUpdate()
{
    CFormView::OnInitialUpdate();
    GetParentFrame()->RecalcLayout();
    ResizeParentToFit();
...
    SetTimer(0, 50, NULL);
}

void CVideoServerView::OnTimer(UINT nIDEvent)
{
    static bool s_bLocked = false;
    if (!s_bLocked)
    {
        s_bLocked = true;

...
        DoSingleShot(); //video grabben und ausgeben (falls kein preview mode)
        DrawSelection();

        s_bLocked = false;
    }

    CFormView::OnTimer(nIDEvent);
}

void CVideoServerView::DrawSelection()
{
    CDC* pDC = GetDlgItem(IDC_FRAME)->GetDC();

    CBrush br(RGB(255,255,0));

    pDC->FrameRect(&m_rAlarmZone, &br);

    GetDlgItem(IDC_FRAME)->ReleaseDC(pDC);
}

void CVideoServerView::OnContextMenu(CWnd* pWnd, CPoint point)
{
    CWnd* pWndPreview = GetDlgItem(IDC_FRAME);

    CPoint p(point);
    ScreenToClient(&p);
    CWnd* pWndHit = this->ChildWindowFromPoint(p);

    if (pWndHit != pWndPreview) //contextmenü nur wenn rechte maustaste in video-frame gedrückt
        return;

    RECT rect;
    GetDlgItem(IDC_FRAME)->GetWindowRect(&rect);
    ScreenToClient(&rect);

    m_nMouseX = p.x - rect.left;
    m_nMouseY = p.y - rect.top;

    CMenu menu;
    menu.LoadMenu(IDR_MAINFRAME);
    menu.GetSubMenu(2)->TrackPopupMenu(TPM_LEFTALIGN|TPM_RIGHTBUTTON, point.x, point.y, this);
}

void CVideoServerView::OnAlarmLinksoben()
{
    m_rAlarmZone.left = m_nMouseX;
    m_rAlarmZone.top = m_nMouseY;

    DrawSelection();
}

void CVideoServerView::OnAlarmRechtsunten()
{
    m_rAlarmZone.right = m_nMouseX;
    m_rAlarmZone.bottom = m_nMouseY;

    DrawSelection();
}