Add information on the left and add parts on the right of the status bar

Example ：

     ui->statusBar->showMessage(" welcome ",3000);

     QLabel* tag=new QLabel("www.QQ.com");
     ui->statusBar->addPermanentWidget(tag);// Permanently add parts , On the right side of the status bar 

showMessage The specified string will be displayed on the left side of the status bar as a prompt , And the second is to specify the time of display .addPermanentWidget Function is the add part function of the status bar , He will display the specified part on the right side of the status bar .

effect ：