The qt5-control-qscrollarea-can be used to split a window into multiple-for example, to display scroll bars based on the picture size

  #ifndef mainwindow_h   #define  Mainwindow_h #include  <qmainwindow># Include  <qlabel> #include  <QPixmap>  #include  <qimage> #include  < Qscrollarea>class  MainWindow: public   qmainwindow{q_object  public  Span style= "color: #000000;"    >: MainWindow (qwidget  *parent = 0  );  ~mainwindow ();};   #endif  //  Mainwindow_h  

#include"mainwindow.h"Mainwindow::mainwindow (Qwidget*parent): Qmainwindow (parent) { This->resize ( -, -);  This-Centralwidget (); Qlabel* label =NewQlabel ( This); Qimage Image ("01.jpg"); Label-Setpixmap (qpixmap::fromimage (image)); Qscrollarea* Area =NewQscrollarea ( This); Area-setwidget (label); Area-setbackgroundrole (Qpalette::D Ark); Area->setgeometry (0,0, Image.width () + -, Image.height ()- -);} MainWindow::~MainWindow () {}

" mainwindow.h "  <QApplication>int main (intChar *argv[]) {    qapplication a (argc, ARGV);    MainWindow W;    W.show ();     return a.exec ();}

The qt5-control-qscrollarea-can be used to split a window into multiple-for example, to display scroll bars based on the picture size