CWebBrowser control in CView doesn't paint correctly

jtc -- jtc@why.net
Thursday, February 06, 1997


Environment: VC++ 4.2b, Win 95

I have a CView that has a Microsoft CWebBrowser control as its 
sole content.  When a document is loaded everything looks fine, 
but when I resize the view, the scroll bars (and most controls 
in the HTML if any) aren't painted.

Just about the only message that I have mapped is OnSize, to 
have the CWebBrowser control resize with the view. When the 
user finishes resizing, the content of the HTML is there, but 
the scroll bars are not painted.  The areas are just grey (my 
window background color).  The OnDraw method is empty since I 
don't have anything I need to paint.  Forcing another repaint 
by dragging another window over it fixes the unpainted area.  
Is there some message I need to be responding to to handle 
these nonclient areas painting?

int CWebbrowsView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
    BOOL    bResult;

    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    bResult = m_browser.Create (NULL, WS_VISIBLE, 
        CRect (0, 0, 0, 0), this, IDC_HTML);

    if (bResult)
        return 0;
    else
        return -1;
}

void CWebbrowsView::OnSize(UINT nType, int cx, int cy) 
{
    CView::OnSize (nType, cx, cy);
    if ((nType != SIZE_MAXIMIZED) && (nType != SIZE_MINIMIZED))
    {
        if (GetDlgItem (IDC_HTML))
        {
            CRect    rect;

            GetWindowRect (&rect);
            m_browser.SetWidth (rect.right - rect.left);
            m_browser.SetHeight (rect.bottom - rect.top);
//          m_browser.Invalidate ();
//          Invalidate ();
        }
    }
}

void CWebbrowsView::OnDraw(CDC* pDC)
{
}

As shown above, even though they should already be invalid, I 
have tried invalidating the browser and view with no effect.  I 
have also tried using a SetWindowPos call instead of the browsers 
SetWidth and SetHeight.  The result was the same.

When watching the window drag (wth full window drag) I can see 
the scrollbars flashing, but they are never there after the final 
paint.

This seems like it would be so simple.  Anyone have any ideas?

Jason

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Dave Lorde -- dlorde@cix.compulink.co.uk
Saturday, February 08, 1997

In-Reply-To: <19970206153719625.AAA70@jason.anet-dfw.com>

I've had a play around with this control, and the redrawing tends to be pretty messy. 

I found the best results using this way of sizing (below), and disabling background erase. There 
are other ways of doing it, but currently I prefer this:

void CWebView::OnSize(UINT nType, int cx, int cy) 
{
    // Disable redraw until all messy sizing is finished
    SetRedraw(FALSE);
    CMDIChildWnd::OnSize(nType, cx, cy);
    if (m_WebBrowser.m_hWnd)
    {
        m_WebBrowser.SetWindowPos(&wndTop, 0, 0, cx, cy, SWP_SHOWWINDOW);
    }
    // Force immediate redraw of view and child control
    SetRedraw(TRUE);
    RedrawWindow(0, 0, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ALLCHILDREN |RDW_NOERASE);
}

BOOL CWebView::OnEraseBkgnd(CDC* pDC) 
{
    // The control does the background
    return TRUE;
}

Your mileage may vary ;-)

Dave

Dave

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