qt - How to add an Item to the specific index in the layout -

i following example create flow layout:

http://doc.qt.io/qt-4.8/qt-layouts-flowlayout-example.html

this doesn't have addtoindex(int _index) function, implement this. since layout uses qlayoutitems, create function can insert item after specific index.

how can index of item integer , insert layout?

update:

flowlayout.cpp

flowlayout *flowlayout = new flowlayout; void flowlayout::insertitem(int index, qlayoutitem *item)  {    if(itemlist.size() < index)    {      itemlist.append(item);    }    else    {      itemlist.insert(index,item);      qrect tmp = this->geometry();    }    update(); } 

flowwindow.cpp

void flowwindow::addlinebreak() {    flowbreak = new flowlayoutbutton(null);    qlayoutitem *item = new qwidgetitem(flowbreak);   flowlayout->insertitem(index, item);   //flowlayout->addwidget(flowbreak);  } 

flowlayoutbutton.cpp constructor

 flowlayoutbutton::flowlayoutbutton(qwidget *_parent):qwidget(_parent)  {   qboxlayout *layout = new qhboxlayout;     flowbreak = new qpushbutton(tr("-------label-------"));   flowbreak->setgeometry(0, 0, 200,20);   layout->addwidget(flowbreak);    setlayout(layout); } 

add following method:

flowlayout.h:

class flowlayout : public qlayout { public:    void insertwidget(int index, qwidget *w);    // rest of class example }; 

flowlayout.cpp:

// new method void flowlayout::insertwidget(int index, qwidget *w) {    addwidget(w);    itemlist.move(indexof(w), index); } 

now can use calling (assuming have pointer layout named flowlayout):

flowlayout->insertwidget(2,new qpushbutton("button"));