c – 从工作线程更新QtCharts的正确方法？

有类似的问题.
我有一个线程将数据加载到Model.在finshed之后我让线程发出信号DataLoadingDone.这通过Qt :: QueuedConnection连接到MainWindow中的一个插槽,因此它从GuiThread进行评估.否则我遇到QBarSet插槽抛出异常的问题.

MainWindow::MainWindow() {
  this->chart = new QChart();
  this->chartView = new QChartView(chart);

  this->series = new QBarSeries();
  this->mapper = new QHBarModelMapper(this);
  this->connect(this->myThread,SIGNAL(DataLoadingDone()),this,SLOT(MyThread_DataLoadingDone()),Qt::QueuedConnection);

  this->setWidget(this->chartView);
}


void MainWindow::MyThread_DataLoadingDone() {

  mapper->setFirstBarSetRow(0);
  mapper->setLastBarSetRow(0);


  mapper->setFirstColumn(0);
  mapper->setColumnCount(this->model->columnCount());

  mapper->setSeries(series);
  mapper->setModel(this->model);

  //only add at the first time
  //if we add this every time something goes wrong and 
  // multiple bars are displayed behind each other
  if (this->chart->series().count() == 0) {
    this->chart->addSeries(series);
    this->chart->createDefaultAxes();
  }
}