QSyntaxHighlighter problem with highlighting opening and closing braces

[Asad]

Hi,
I am trying to make highlighting the opening and closing braces in formula editor.
suppose for example.
((ab) +(ac))
if i select the first opening braces it should highlight the corresponding(last one ) closing braces.
my problem is its highlighting for the first line correctly but for the second line if i am selecting its also showing for the previous line.
i am attaching the screen shot of output as well as my code.
i tried may thing but does not work.
please advise something will be appreciated.

thanks
output image link
!http://i.imgur.com/gnISbdN.png()!
@MyHighlighter::MyHighlighter(QTextDocument *parent) :
QSyntaxHighlighter(parent)
{
selectedPos = -1;
}

void MyHighlighter::highlightBlock(const QString &text)
{
qDebug()<<text <<"#####";
QTextCursor cursorPos;

if(textBlock.isEmpty())
{
    textBlock = text;
    qDebug()<<textBlock <<"****";

}

---

if(getSelectedPosition()>=0 && getSelectedPosition()<=textBlock.length())
{
    qDebug()<<getSelectedPosition()<<"this";
    QChar selChar = textBlock.at(getSelectedPosition());
    qDebug() <<"selchar" <<selChar;

    if(selChar == '(')
    {
        int charPos = getSelectedPosition()+1;
        qDebug() <<"charPos" <<charPos;
        int openBracketsCount = 1;
        int currentBlock = -1;
        int blockStartPosition = -1;
        for (int cBlock = 0; cBlock < document()->blockCount(); ++cBlock) {
            if(blockStartPosition==-1)
            {
                blockStartPosition = 0;

            }
            int ct = document()->findBlock(cBlock).length();
            qDebug() <<"int ct" <<ct;
            if(getSelectedPosition()>=blockStartPosition && getSelectedPosition()<blockStartPosition+ct)
            {
                currentBlock = cBlock;
                break;
            }
            blockStartPosition += ct;
        }
        setCurrentBlockState(1);
        QTextBlock currentBlk = document()->begin();
        while(currentBlk.isValid())
        {
            for (int var = 0; var < currentBlk.length(); ++var) {
                if(getSelectedPosition()>=blockStartPosition && getSelectedPosition()<=blockStartPosition)
                {
                    qDebug()<<"Current block text : "<<currentBlk.text();

                }
            }
            currentBlk = currentBlk.next();
        }
        while(charPos<= textBlock.length())
        {

            QChar charToCheck = textBlock.at(charPos);

// qDebug()<<charToCheck<<"charToCheck"<<text.length();
if(charToCheck == ')')
{
if(openBracketsCount == 1)
{
// code to highlight charToCheck and selChar
qDebug()<<"sel : "<<getSelectedPosition()<<" - Match : "<<charPos;
qDebug()<<"block : "<<currentBlock<<" - "<<blockStartPosition;

                    QTextCharFormat multiLineCommentFormat;
                    multiLineCommentFormat.setForeground(Qt::red);
                    cursorPos.setCharFormat(multiLineCommentFormat);
                    setCurrentBlockState(0);
                    setFormat(getSelectedPosition()-blockStartPosition,1,multiLineCommentFormat);
                    setFormat(charPos-blockStartPosition,1,multiLineCommentFormat);



                    //QString pattern = "\\b[A-Za-z]+\\b";
                    break;
                }
                else
                {
                    openBracketsCount--;
                }
            }
            else if(charToCheck == '(')
            {
                openBracketsCount++;
            }
            charPos++;
        }
    }
    else if(selChar == ')')
    {
        int charPos = getSelectedPosition()-1;
        int closeBracketsCount = 1;
        while(charPos>=0)
        {
            QChar charToCheck = textBlock.at(charPos);
            if(charToCheck == '(')
            {
                if(closeBracketsCount == 1)
                {
                    // code to highlight charToCheck and selChar
                    qDebug()<<"sel : "<<getSelectedPosition()<<" - Match : "<<charPos;

// QTextCharFormat format;
// format.setForeground(QBrush(QColor(255,0,0)));
QTextCharFormat existingFormat = format(getSelectedPosition()+1);

                    existingFormat.setForeground(Qt::green);
                    existingFormat.setBackground(Qt::black);

// setCurrentBlockState(0);

                    setFormat(getSelectedPosition(),1,existingFormat);
                    setFormat(charPos,1,existingFormat);

// qDebug()<<text.length();

                    break;
                }
                else
                {
                    closeBracketsCount--;
                }
            }
            else if(charToCheck == ')')
            {
                closeBracketsCount++;
            }
            charPos--;
        }
    }
    qDebug()<<"ct block : "<<currentBlock().blockNumber();
}

}

void MyHighlighter::setSelectedPosition(int pos,const QString &text)
{
selectedPos = pos;
textBlock = text;
rehighlight();
}

int MyHighlighter::getSelectedPosition()
{
return selectedPos;
}@

[vicky12]

look asad basically textedit take every thing in form of block .. so first try to grasp all the text block data into one and then try.