QTableView锁定选区

• 不错的qt线程启动暂停停止的实现方法:
  

具体实现参考:

https://codereview.stackexchange.com/questions/26724/thread-pausing-resuming-canceling-with-qt

• QItemDelegate绘制图片
  

m_image = new QImage(":/xxxx.png");

...
painter->drawImage(option.rect,*m_image);

• QTableView锁定选区的一个实现思路

在子类中重写虚函数selectionChanged

void xxxTableView::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
    if(isLocked){
       bool oldstate =  this->blockSignals(true);
       bool oldstate1 =  this->selectionModel()->blockSignals(true);
       this->selectionModel()->select(selected, QItemSelectionModel::Deselect);
       this->selectionModel()->select(deselected, QItemSelectionModel::Select);
       this->blockSignals(oldstate);
       this->selectionModel()->blockSignals(oldstate1);
    }else{
        //emit onViewSelectionChanged(this->selectedIndexes());//如果需要捕捉选区变化,注意这里没有使用selected
    }
    viewport()->update();
}

void xxxTableView::setSelectQuiet(QRect &rect)//忽略当前锁定设置的选择
{
    bool oldstate =  this->blockSignals(true);
    bool oldstate1 =  this->selectionModel()->blockSignals(true);
    QModelIndex topLeft = this->model()->index(rect.top(),rect.left());
    QModelIndex bottomRight = this->model()->index(rect.bottom(),rect.right());
    QItemSelection se(topLeft,bottomRight);
    this->selectionModel()->select(se,QItemSelectionModel::Select);
    this->blockSignals(oldstate);
    this->selectionModel()->blockSignals(oldstate1);
}

• std::queue下标索引

https://stackoverflow.com/questions/5877504/access-c-queue-elements-like-an-array

/*--------------------------------------------其他------------------------------------------------------------*/

最近犯的几个错误：

队列元素采用变量缓存后,对缓存变量做自增自减操作,问题是每次再缓存时又重新覆盖；

类中包含指针成员时,尽量使用赋值而不是memcpy,触发有大批量的并且有性能要求,同样的包括拷贝构造;