?
Solved

Updating labels quickly without a flicker

Posted on 2002-07-03
7
Medium Priority
?
1,008 Views
Last Modified: 2010-04-04
I'm collecting data from a data Aquisition device.  Right now I'm only gathering the data about once per second.  I'm using pre-positioned labels on the form to display the information by the following method.

Inside a Timer loop with intervals at 1000
Query the Device
Assign the value to each label (about 30 labels)
application.processmessages

My labels flicker real bad and sometimes just blank out
with a white background like I'm not getting them displayed properly.

Is there a better way to handle this, or even a better way to display the data prepositioned on the form?

I can update a memo with the information to verify all the data is correct, and also to make sure the query isn't taking to long, so I believe it's the technique I'm attemping to use.
0
Comment
Question by:rwskinner
7 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7126582
-place a panel as background-container
-set doublebuffered to true
0
 
LVL 3

Accepted Solution

by:
marcoszorrilla earned 200 total points
ID: 7126601
Try puttint DoubleBuffered:=True;
You can do a test with this very simple sample.

procedure TForm1.Button1Click(Sender: TObject);
var
i:Integer;
begin

DoubleBuffered:=True;
for i:=1 to 10000 do
begin
Application.ProcessMessages;
label1.Caption:=IntToStr(i);
end;


Best Regards.
Marcos.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7126629
btw. marcoszorrilla

take your points at q
http://www.experts-exchange.com/delphi/Q_20318113.html

meikl ;-)
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
LVL 3

Expert Comment

by:marcoszorrilla
ID: 7126632
Sorry Kretzschmar when I start to prepare my example ther is any answer.

Best Regards.
Marcos.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7126642
doesn't matter, marcos,

but take your points from qow 18 at
http://www.experts-exchange.com/delphi/Q_20318113.html
0
 

Expert Comment

by:Zoly
ID: 7127580
Also, using TStaticText instead of TLabel is always an idea worth considering. TStaticText is a TWinControl while TLabel is a TControl and so you get much smoother effects (less/no flicker) with TStaticText.

Z
0
 

Author Comment

by:rwskinner
ID: 7130831
Thanks for the help.  That cured the problem.  I added the refresh command as well and it helped.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
This is an update to some code that someone else posted on Experts Exchange. It is an alternate approach, I think a little easier to use, & makes sure that things like the Task Bar will update.
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…

621 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question