WindowLessRe, the caret will flicker when i call the function “CTxtWinHost::SetClientRect”,how to solve this problem?

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C++

MFC

WTL

i want to use the control named windowlessrechedit.

i will call the function "CTxtWinHost::SetClientRect" When the window size changes,than the Caret always flickers.


the code

//it will be called,When the window size changes.
//OnSize will call it.
void CxRichEdit::CxSetRect(RECT rc,bool bInvalidate)
{
	CxAncestor::CxSetRect(rc,bInvalidate);
	IFISNULLSTOP(m_pTwhost);
	if(xScrollVert.IsVisible())
	{
		CxRect rcScroll(rc.right-dwScrollWidth,rc.top,rc.right,rc.bottom);
		xScrollVert.CxSetRect(rcScroll,false);
		rc.right-=dwScrollWidth;
	}
	int ixMargins = GET_X_LPARAM(lpMargins);
	rc.left+=ixMargins;
//here,i want to chang the rect of ITextHost. 
//ITextHost m_pTwhost 
	m_pTwhost->SetClientRect(&rc,true);
}