[Interest] QTextEdit is too slow - hints needed

[Jason H]

Use PlainTextEdit or develop your own Widget. 
If I rememer correctly, a significant amount of time was consumed in formatting the text. Since you're appending, you shouldn't need to layout (wrap) anything but the current line. So when you append text you don't re-avaliate the block of text. In a weird way a combolist box might be what you want. 






________________________________
 From: JM <johnmiller at email.it>
To: interest at qt-project.org 
Sent: Monday, January 14, 2013 7:16 PM
Subject: [Interest] QTextEdit is too slow - hints needed
 
Hi all,

I am using QTextEdit to display log text files, just like the Unix command tail -f. 
My current implementation just displays the last 5 lines and then follows the growing
log file, displaying lines as they come.
Now, I am asked to make QTextEdit display the whole file when the user opens a file.
A log file can be very large. I tested it with a 2mbyte file, and inserting data to QTextEdit
caused the GUI to freeze for almost 1 minute.
This is not acceptable, and I am looking for a solution. I have the following questions:

-) what is the fastest way to insert lots of text into QTextEdit?
-) should I go to the route of implementing my own QTextDisplay? If so, 
should I use QAbstractScrollArea as class base? Any pointer to how to use it?

Thanks in advance,
JM
_______________________________________________
Interest mailing list
Interest at qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20130115/c5227d44/attachment.html>