how to highlight selected text in QTextEdit?

[chaochao]

I has realised a small app like NoteBook.Now,I want to hight selected text,but I have no idea about this. I create a class that inheit QSyntaxHighlighter.

//your code here
.h
class Myhighlitghter : public QSyntaxHighlighter
{
public:
    explicit Myhighlitghter(QTextDocument *parent=0);
protected:
     virtual void highlightBlock(const QString &text);
};
.cpp
Myhighlitghter::Myhighlitghter(QTextDocument *parent)
    :QSyntaxHighlighter(parent)
{

}

void Myhighlitghter::highlightBlock(const QString &text)
{
    QTextCharFormat charformat;
    charformat.setFontWeight(QFont::Bold);
    charformat.setForeground(Qt::red);

    QString pattern="\\bchar\\b";

    QRegExp exp(pattern);

    int index = text.indexOf(exp);

    while(index>=0)
    {
        int len=exp.matchedLength();

        setFormat(index,len,charformat);

        index = text.indexOf(exp,index+len);
    }
}

then I create a mainwindow that has Qtextedit and Myhighlitghter object.Now , I want to select text in textedit and hightlight them.

thank for your help

[Ni.Sumi]

@chaochao

QTextCursor will help you to select the text, delete , replace, background color of the selected text.

[chaochao]

@Ni.Sumi very thanks, I will have a try