. . . Rectangle { id: frameRect objectName: "autoRec" width: 720 height: 400 anchors.bottomMargin: 3 anchors.bottom: buttonsMenu.top x: parent.width / 2 - width / 2 y: parent.height / 7 - height / 7 color: "transparent" anchors.horizontalCenter: parent.horizontalCenter QPImage { id: qpImage anchors.fill: parent } Connections { target: controller_ onShowFrameSignalCtrl: { //Q_SIGNAL void showFrameSignalCtrl(); signal c++ qpImage.setImage( backend_.getImageContainer() ) } } . . .