qt - Assigning Icons to items in QTreeView -

i have class inheriting qtreeview. need assign icons different types of files , directories. there solution given this question:

qvariant myqfilesystemmodel::data( const qmodelindex& index, int role ) const {     if( role == qt::decorationrole )     {         qfileinfo info = myqfilesystemmodel::fileinfo(index);          if(info.isfile())         {             if(info.suffix() == "dat")                 return qpixmap(":/icons/file_icon.png");//i pick icon depending on extension             else if(info.suffix() == "mcr")                 return qpixmap(":/icons/region_icon.png");         }     }     return qfilesystemmodel::data(index, role); } 

my class not inherit qfilesystemmodel rather compose in, means cannot overide function data(). above, how icons show up? calling data() in constructor?

you need add model tree root node:

qstandarditemmodel* model = new qstandarditemmodel; qstandarditem * rootnode = model->invisiblerootitem(); this->setmodel(model); //your class inherts qtreeview 

and add item icon :

qstandarditem* item = new qstandarditem("myitem") item->seticon(qicon("icon.jpg")); rootnode->appendrow(item); 

you may have : http://hpics.li/e9dc5dd