def mouseMoveEvent(self, event):
if not event.buttons() & Qt.LeftButton: return
if (event.pos() - self.drag_pos).manhattanLength() < 100: return
event.accept()
drag = QDrag(self)
mimedata = QMimeData()
mimedata.setData("action", "window_drag")
drag.setMimeData(mimedata)
widget = self.current_widget
pixmap = QPixmap.grabWidget(widget).scaledToWidth(300, Qt.SmoothTransformation)
dragpixmap = DragPixmap(pixmap, 0.50, self)
dragpixmap.move(QCursor().pos())
dragpixmap.show()
drag.exec_()
dragpixmap.deleteLater()
self.widgetDnD.emit(self.current_widget, drag.target())
return
