Customize the QLineEdit by paintEvent（）， the cursor can't follow the text.

[high_flyer]

QLine cursor(this->cursorRect().x(), this->cursorRect().y(), this->cursorRect().x() , this->cursorRect().y()+ this->cursorRect().height() -1);

Of course the cursor is in the same place, since you are giving it the current cursor position.
You need to give your cursor the position you want it to be in!
this->cursorRect().x() + ofsset