void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
if(_isSelecting && event->buttons() == Qt::LeftButton) {
updateSelection(event->scenePos());
void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
if(_isSelecting && event->buttons() == Qt::LeftButton) {
updateSelection(event->scenePos());