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Warrick Wilson · Guest

I'm playing with the RunningText component from scalabium.com. It's an older
component (last date is 1999), but works reasonably well. However, I'm
trying on a large scale (full width of monitor, 15% of viewable area) -
trying to create a "marquee" or "running text" effect.

While it works, I get a LOT of flicker. I've done Google searches, and tried
a lot of the ideas from efg2.com's pages - put the component on a Panel, try
DoubleBuffered := true, ry addigng csOpaque to ControlStyle, etc. - but
there's still a lot of flicker.

We're using a freeware Java applet called ProScroll in some similar types of
situations, and it doesn't flicker like this. However, it doesn't go fast
enough to make people happy, so I was trying to create an ActiveX control
using this RunningText component.

Anyone have any suggestions on what else I might try, or on replacement
components to look at that produce a similar effect?

Both the applet and my new control will pause at different points when stuff
happens elsewhere on the screen .. I need to look at that later.

Thanks.

Peter Below (TeamB) · Guest

In article <40c247f3$1 (AT) newsgroups (DOT) borland.com>, Warrick Wilson wrote:

Warrick Wilson · Guest

Thanks for the reply, Peter. I hadn't run across that method before, so I
wrote a simple program to try it out. As a result, I'm confused about how
that operates now, too....

I placed a panel on a form, and put two buttons on: one to shift by 2 pixels
left, one to shift by 2 pixels right.

I put a caption in my panel (Panel1.Caption := 'This is my text' Wink

, made the
font bigger, colored the background, and ran.

When I scroll 2 pixels left, the movement is smooth. But I can't figure out
how I'm supposed to color the 2 columns of pixels that get "uncovered'. I
can scroll more, and the front of my caption disappears off the left side of
the panel.

When I start to scroll to the right, the stuff that was cut off is still
missing. Probably as expected, but I couldn't figure out how I'd put the
proper stuff back.

So then I tried putting an Image on the Panel, and seeing if I could scroll
that.

Nothing doing, although I'm sure it's operator error.

Can you point me at any examples that might show this technique you've
mentioned in action? Particularly if it involves filling in information on
the right as things "scroll off" to the left?

Thanks.

"Peter Below (TeamB)" <100113.1101 (AT) compuXXserve (DOT) com> wrote

Warrick Wilson · Guest

I spoke too soon, except about the part about my problem being operator
error...

When I put the image on the panel, I had it resizing to fit the panel.
Oops...that made it always stay on the panel. I turned that off and suddenly
I can scroll the image off the panel, and the cool part is that the piece
that slides off comes back when I slide the opposite direction.

This may indeed work out very nicely.

"Warrick Wilson" <warrickw (AT) mercuryonline (DOT) com> wrote