QTextEdit super slow resize

[bunjee]

QTextEdit * test = new QTextEdit;
QString string;
for (int i = 0; i < 50000; i++)
{
      string += 'o';
}
test->setText(string);
test->show();

QTextEdit * test = new QTextEdit;
QString string;
for (int i = 0; i < 50000; i++)
{
      string += 'o';
}
test->setText(string);
test->show();

To copy to clipboard, switch view to plain text mode 

== Super slow window resize.

How can I optimize this ?

[pherthyl]

I assume its the word wrap that's killing your performance here. If you really need fast resizes, I would suggest manual word wrap + scroll bars.

[bunjee]

You're right, the word wrap seems to be the reason.

Did you implement your own wordwrap algorithm ? Why is qt's default one so slow ?

[fullmetalcoder]

Why is qt's default one so slow ?

Because it requires the layout of the whole document to be re-computed, which can be a quite time-consuming operation.

[jpn]

How about QPlainTextEdit...

[bunjee]

I'll take a look.