before initialising my label i made my widget to full screen.
my code:
widget.cpp
Qt Code: 
  1. Widget::Widget(QWidget *parent) :
  2.     QWidget(parent),
  3.     ui(new Ui::Widget)
  4. {
  5.  
  6.     showFullScreen();
  7.      activateWindow();
  8.     label=new QLabel(this);
  9.  
  10. }
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displaying images in label:
Qt Code: 
  1. void displayimages()
  2. {
  3. ImageToLoad.load(dir.absoluteFilePath(remoteimagefilename)); //image name
  4. label->setPixmap(QPixmap::fromImage(ImageToLoad.scaled(1025,1025,Qt::KeepAspectRatio,Qt::FastTransformation))); label->showFullScreen();
  5. }
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mouseclick event
Qt Code: 
  1. void Widget::mousePressEvent(QMouseEvent *event)
  2.     {
  3.     if (event->button() & (Qt::LeftButton | Qt::RightButton))
  4.     {
  5.     showMaximized();
  6.     activateWindow();
  7.     update();
  8.  
  9.     }
  10.     }
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Quote Originally Posted by wysota View Post
What have you tried so far to solve your problem?