Re: Flickering

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Ratson Janiv (janiv_at_013.net.il)
Date: 05/25/04

  • Next message: Robert: "Losing main form content when switching screens" 
    Date: Tue, 25 May 2004 18:31:24 +0200

    10x I'll try it.
    I have both controls and images I draw.
    What does the WS_CLIPCHILDREN do ?
    10x again and again & again && again,
    janiv.

    "Jerry Coffin" <jcoffin@taeus.us> wrote in message
    news:MPG.1b1c990f438d00b2989720@msnews.microsoft.com...
    > In article <e$lchcWQEHA.3264@TK2MSFTNGP10.phx.gbl>, janiv@aoe6.net
    > says...
    > > 10x all,
    > > your advice has solved the problem.
    > > I had to make all work in on Erase Background.
    > > 10x again.
    > >
    > > Now I have a new problem, I M sure it is because of me being newibie.
    > > I may sound silly, but I need your help so much ...
    > > So the problem is that now, the background is redrawn and not flickers,
    but
    > > the buttons (or other controls) which are located on the background, are
    > > redrawn (because OnEraseBackground is called?) so the effect is seen
    clearly
    > > and ugly.
    > > Is there anyway preventing the buttons to redrawn (I think not).
    > > Is there anyway to redraw the buttons without seeing that ugly effect
    > > (deleting and redrawing, like light flickering effect).
    >
    > Presumably the buttons (and other controls) are children of the
    > surrounding window. In that case, you want to specify
    > WS_CLIPCHILDREN when you create the parent window.
    >
    > If the buttons and other controls are just images you're drawing
    > yourself, you have a couple of choices. One is to draw all of them
    > to an off-screen bitmap, and then blit the result to the window.
    >
    > Another possibility is to use ExcludeClipRect on the rectangles for
    > the controls before drawing the background. When you do this, you
    > typically want to draw a control, then exclude its rectangle.
    > Finally, when you've drawn all the controls and excluded their
    > rectangles, you draw in the background. The clipping region will
    > prevent it from being drawn over the controls.
    >
    > --
    > Later,
    > Jerry.
    >
    > The universe is a figment of its own imagination.

  • Next message: Robert: "Losing main form content when switching screens"
    • Quantcast