原文出处：http://blog.sina.com.cn/s/blog_a07a3f180102uyou.html
void Widget::setCharColor(unsigned int pos)
{
if(pos <= 0)return ;
QTextCursor cursor = ui->view1->textCursor();
cursor.movePosition( QTextCursor::StartOfLine );//行首
cursor.movePosition( QTextCursor::Right, QTextCursor::MoveAnchor, pos-1);//向右移动到Pos
cursor.movePosition( QTextCursor::NextCharacter, QTextCursor::KeepAnchor );
ui->view1->setTextCursor( cursor ); // added
QTextCharFormat defcharfmt = ui->view1->currentCharFormat();
QTextCharFormat newcharfmt = defcharfmt;
newcharfmt.setFontUnderline( true );
newcharfmt.setUnderlineColor( QColor( Qt::red ) );
newcharfmt.setUnderlineStyle( QTextCharFormat::SingleUnderline );
ui->view1->setCurrentCharFormat( newcharfmt );
cursor.movePosition( QTextCursor::PreviousCharacter );//加上这句是为了去除光标selected
ui->view1->setTextCursor( cursor ); // added
// ui->view1->setCurrentCharFormat( defcharfmt );
ui->view1->setFocus();
}
