On traversal of tree nodes

Be careful ,lamda expression , If you use [=], At the moment of generation , The internal corresponding global variable is converted to a local variable , Will not be active with the global .

bool flagUseForSentryPost=_sentryPostIDShown==""?false:true;
// Flag used to mark whether to turn on the keyword filtering of sentinel name ：
bool falgUseForFilterQString=!txt.isEmpty();
// Used to determine whether it is a sentry box node ：
auto isSentryPost=[=](QTreeWidgetItemIterator item){return (*item)->text(2)=="sentrypost"?true:false;};
// Used to determine whether it is a camera node ：
auto isCamera=[=](QTreeWidgetItemIterator item){return (*item)->text(1)=="camera"?true:false;};
// Used to determine whether it is an organization node :
auto isOrg=[=](QTreeWidgetItemIterator item){return (*item)->text(2)=="org"?true:false;};

QTreeWidgetItemIterator it(this);
// If the filter specifies a sentinel ：
if(flagUseForSentryPost)
{
    // All hidden at first ：
    while(*it)
    {
        (*it)->setHidden(true);
        it++;
    }

    // Set the iterator pointer to the header 
    it=QTreeWidgetItemIterator(this);
    while(*it)
    {
        // If the current node is a sentinel node and conforms to id requirement 
        if(isSentryPost(it)&&_sentryPostIDShown==(*it)->text(5))
        {
            // Show all its parent nodes 
            (*it)->setHidden(false);
            this->parentVisible(*it);
            // Then display all its child nodes ：
            for(int i=0;i<(*it)->childCount();i++)
            {
                (*it)->child(i)->setHidden(false);
            }
        }
        it++;
    }
}
else// Do not filter the designated sentry to display all directly 
{
    while(*it)
    {
        (*it)->setHidden(false);
        it++;
    }
}
// Add text filter below ： If the sentinel name filter is started ：
if(falgUseForFilterQString)
{
    // Traverse multiple current display nodes 
    it=QTreeWidgetItemIterator(this,QTreeWidgetItemIterator::IteratorFlag::NotHidden);
    QString str;
    while(*it)
    {
        str=(*it)->text(0);
        // If the node contains the specified name ：
        if(str.indexOf(txt)!=-1)
        {
            // Show all its parent nodes 
            this->parentVisible(*it);
        }
        else// Hide this node 
        {
            (*it)->setHidden(true);
        }
        it++;
    }
}