Re: Flicker free scrolling

Author

Message

Bob Dalton

Posted: 02/17/2002 23:33:43

> Flicker? I beleive that only components inserted in RichView can flicker,

RichView

> itself cannot (because it uses a double buffering)

> Please send me a project to reproduce this problem.

Actually you can see this yourself by doing the following to your

"Multi-Demo". Go to the Demo6Frm.pas portion and set the following property

of the TRichView component (ie; rv) as follows:

rv.backgroundstyle := NoBitMap;

Now run and choose the credits portion of the demo.

Did some research on this and can see why you might not have spotted it. A

red or darker color background or bitmap, such as the one you are using in

the demo, tends to mask the problem. It is much more apparent on a white

background though or lighter color bitmap. My experiments using a large

number of backgrounds colors and bitmaps and combinations tends to support

what I found out.

Another thought is that use of the TTimer component may introduce enough of

a delay to make flicker perceiveable against light colors and/or bitmaps.

BTW I am running then demo on a brand new 1.2 Ghz WindowsXP Pro machine

using a flat screen monitor.

Regards;

Bob Dalton