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Maarten
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 Posted: Thu Jan 20, 2005 8:49 am Post subject: Repaint |
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When I'm doing extensive calculations or I/O (for instance, reading a large file), the form never repaints.
Practical example: I wrote a program that helps me out with Scrabble. The word list is quite extensive, so it takes quite some time to read from disk. When I drag another Window over my Borland application, the form is not updated and I get an empty rectangle on my screen. When Borland is finished processing, the repaint is carried out.
How do I solve this? Do I have to enter code in every loop that requires a lot of calculation?
-Maarten
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Wiljo de Ruiter
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| Posted: Thu Jan 20, 2005 9:01 am Post subject: Re: Repaint |
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Maarten wrote:
| Quote: | When I'm doing extensive calculations or I/O (for instance, reading a large file), the form never repaints.
Practical example: I wrote a program that helps me out with Scrabble. The word list is quite extensive, so it takes quite some time to read from disk. When I drag another Window over my Borland application, the form is not updated and I get an empty rectangle on my screen. When Borland is finished processing, the repaint is carried out.
How do I solve this? Do I have to enter code in every loop that requires a lot of calculation?
-Maarten
Hello Maarten, |
Do you read this word list more than once, everytime you need to test a word in
the Scrabble game? Maybe it's better to read it once at the start of your
program. If this doesn't help, try starting a thread that reads the file. This
should free your form from not being updated. Take a look at TThread in your
online help.
Success,
Wiljo.
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Hans Galema
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| Posted: Thu Jan 20, 2005 9:46 am Post subject: Re: Repaint |
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Wiljo de Ruiter wrote:
| Quote: | try starting a thread that
reads the file. This should free your form from not being updated. Take
a look at TThread in your online help.
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That is a good solution.
A simple solution would be to add a statement
Application->ProcessMessages();
in the loop.
If it is a fast loop then there were to many calls
and your application would slow down. In that case
use a counter to call the function say every 100 loops.
Hans.
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