C / C++ / MFC

<br />
//Dialog - prevent changes from being redrawn<br />
this->SetRedraw(FALSE);<br />
<br />
//invert parts of static image onthe Dialog, behind the controls<br />
pDC = this->GetDC();<br />
targetDC.CreateCompatibleDC(pDC);<br />
pOldTargetBmp = targetDC.SelectObject(&m_BmpTarget);<br />
targetDC.PatBlt(X,Y,iWidth,iHeight,DSTINVERT);<br />
targetDC.SelectObject(pOldTargetBmp);<br />
targetDC.DeleteDC();<br />
ReleaseDC(pDC);<br />
m_DialogStaticImage.SetBitmap(HBITMAP(m_BmpTarget));<br />
<br />
//redraw all controls to put them into foreground<br />
m_staticText.RedrawWindow(NULL,NULL,RDW_UPDATENOW);<br />
m_editBox.RedrawWindow(NULL,NULL,RDW_FRAME+RDW_INVALIDATE+RDW_UPDATENOW);<br />
.<br />
. about 15 controls<br />
.<br />
<br />
//Dialog - allow changes to be redrawn<br />
this->SetRedraw(TRUE);<br />
<br />
//no need to erase background since SetBitmap covered everything up<br />
this->Invalidate(FALSE);<br />
<br />
//show updated Dialog<br />
this->UpdateWindow();<br />

abiemann wrote:

I was surprised that it would still flicker; I was hoping that all the graphics operations were done in memory, then simply shown when UpdateWindow was called - thus avoiding flicker.

Mark Salsbery
Microsoft MVP - Visual C++

abiemann wrote:

//no need to erase background since SetBitmap covered everything up
this->Invalidate(FALSE);

abiemann wrote:

no I haven't touched the OnEraseBkgnd()...

this->Invalidate(TRUE);<br />
this->UpdateWindow();