c++ - Redefining QTreeWidgetItem::operator< -

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my main goal here redefine operator< can sort columns numerically instead of alphabetically. code have far:

mainwindow.h

#ifndef mainwindow_h #define mainwindow_h //bunch of includes... #include <qtreewidgetitem> #include <qtreewidget>  extern qsqldatabase db; extern qstring prefix; extern qstring site; extern qstring dbname; extern qstring user;  namespace ui { class mainwindow; }  class clientinfo;  class mainwindow : public qmainwindow {     q_object  public:     explicit mainwindow(qwidget *parent = 0);     void rpopulate();     void rbookingdisplay();     qpushbutton *button;     ~mainwindow();  public slots:     //slots...  private:     ui::mainwindow *ui;     void closeevent(qcloseevent *close); };  class treewidgetitem : public qtreewidgetitem { public:     treewidgetitem(qtreewidget *tree) : qtreewidgetitem(tree)  {}     treewidgetitem(qtreewidget * parent, const qstringlist & strings)                    : qtreewidgetitem (parent,strings)  {}     bool operator< (const qtreewidgetitem &other) const     {         int sortcol = treewidget()->sortcolumn();         int mynumber = text(sortcol).toint();         int othernumber = other.text(sortcol).toint();         return mynumber < othernumber;     } };  #endif // mainwindow_h

and in mainwindow.cpp have ui->_display->setsortingenabled(true);

somehow doesn't use redefined operator< (the redefined function never called, uses predefined one). please help.

ui->_abooking->clear(); ui->_abooking->setsortingenabled(false); qsqlquery query; query.prepare(" select shownumdays, shownumpastdays setting_"+ user +               " id = 1; "); query.exec(); query.first(); int days = query.record().value("shownumdays").toint(); int pastdays = query.record().value("shownumpastdays").toint(); query.prepare(" select `"+columns.join("`, `")+               "`,`currency`, `# of room` "               " abooking "               " (date_add(`arrival date`,interval `nights` - 1 day) >= (current_date - "+ qstring::number(pastdays) +") , "               " (to_days(`arrival date`) + `nights` - 1 - to_days(now())) <= "+ qstring::number(days) +") "); query.exec(); qstring confirm_num = ""; bool flip = true; while (query.next()){             if (!(confirm_num == query.record().value("confirmation #").tostring())) {         flip = (!flip);     }     qtreewidgetitem *item = new qtreewidgetitem();     (int = 0; < columns.length(); i++) {         if (columns.at(i) == "arrival date") {             item->settext(i, query.record().value(columns.at(i)).todate().tostring("dd-mm-yyyy"));         } else if ((columns.at(i) == "amount due" || columns.at(i) == "paid") && (confirm_num == query.record().value("confirmation #").tostring())) {             item->settext(i, "");         } else if ((columns.at(i) == "arrival time")){             item->settext(i, "      " + query.record().value(columns.at(i)).totime().tostring("hh:mm"));         } else {             item->settext(i, query.record().value(columns.at(i)).tostring());         }         if (columns.at(i) == "amount due" && (!(item->text(i) == ""))) {             item->settextcolor(i, qt::darkred);             item->settext(i, item->text(i) + " " + query.record().value("currency").tostring());         } else if (columns.at(i) == "room") {             item->settext(i, query.record().value("# of room").tostring() + " " + item->text(i));         }         if (flip) {             item->setbackground(i , qt::gray);         }     }     if ((!(confirm_num == query.record().value("confirmation #").tostring()))) {         confirm_num = query.record().value("confirmation #").tostring();         ui->_abooking->addtoplevelitem(item);     } else {         ui->_abooking->toplevelitem(ui->_abooking->toplevelitemcount() - 1)->addchild(item);         ui->_abooking->toplevelitem(ui->_abooking->toplevelitemcount() - 1)->setexpanded(true);     } } ui->_abooking->setsortingenabled(true);

you're reimplementing qtreewidgetitem custom class, don't use when populating qtreewidget.

instead of

qtreewidgetitem *item = new qtreewidgetitem();

this should be:

treewidgetitem *item = new treewidgetitem();

other that, code operator < looks fine. i'm using same , works me.


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