support rubber band selection

    def mouseMoveEvent(self, event: QGraphicsSceneMouseEvent) -> None:

        if self.creating_textblock:

            epos, opos = event.scenePos(), self.create_block_origin

            w, h = epos.x() - opos.x(), epos.y() - opos.y()

            if w < 0:

                x = epos.x()

                w = -w

            else:

                x = opos.x()

            if h < 0:

                y = epos.y()

                h = -h

            else:

                y = opos.y()

            self.txtblkShapeControl.setRect(QRectF(x, y, w, h))

            self.txtblkShapeControl.setRect(QRectF(self.create_block_origin, event.scenePos()).normalized())

        elif self.stroke_path_item is not None:

            self.stroke_path_item.addNewPoint(self.imgLayer.mapFromScene(event.scenePos()))

        elif self.scale_tool_mode: