[Qt-interest] How can I set to position in QPlainTextEdit?

[Iurii Gordiienko]

My code work also if I not call QPlainTextEdit::setTextCursor( tc_first ) after underlying text...    
    I will have error only if I will call setTextCursor.    My QPlainTextEdit has the ReadOnly attribute.        
    
    
    Iurii Gordiienko writes    
    
> Hi In my programm I should find some words and set it's background    
> to green color, also I should scroll editor to first word that was    
> finds... I use document()->find and as a result I use    
> QPlainTextEditor::setTextCursor(...), but after this sometimes the    
> backround of ALL text becomes green... I don't understand    
> why... Simple example is attached. Thanks    
    
Does it happen when the text is changed in the view?    
I vaguely recall seeing something like this, when the underlying text    
is changed entirely but the format of the previous text somehow seeems    
to stick.    
    
Anyway, FWIW here is some code that's a bit similar to yours but works    
for me. The main difference is I'm using setExtraSelections().    
    
{    
QList<QTextEdit::ExtraSelection> qlist;    
if (lst.empty()) {    
setExtraSelections(qlist);    
return;    
}    
std::list<searched_text>::const_iterator it = lst.begin();    
QTextEdit::ExtraSelection qsel;    
QTextCharFormat qfmt;    
qfmt.setBackground(QBrush(QColor("yellow")));    
qsel.format = qfmt;    
QTextCursor tcursor;    
    
QTextDocument::FindFlags flags=0;    
if (it->m_is_cs)    
flags |= QTextDocument::FindCaseSensitively;    
if (it->m_is_word) {    
flags |= QTextDocument::FindWholeWords;    
}    
    
for ( ; it!=lst.end(); ++it) {    
int index=0;    
do {    
tcursor = document()->find(it->m_text, index, flags);    
if (!tcursor.isNull()) {    
qsel.cursor=tcursor;    
qlist.append(qsel);    
index = tcursor.position()+1;    
}    
} while (!tcursor.isNull());    
}    
setExtraSelections(qlist); // even if qlist is empty (otherwise we    
get a blank rectangle colored as the selection)    
}    
    
Best regards,    
--    
Daniel    
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