c++ - Qt update() doesn't work -


i have problem , update() function in qgraphicsitem doesn't work. want , when move circle , other qgraphicsitem( in mean time roundrect ) changes color. example, want do:

circle.cpp:

void circleitem::mousemoveevent(qgraphicsscenemouseevent *event) {     // roundrect object     rectitem->setbackground();     qgraphicsitem::mousemoveevent( event ); }

roundrect.cpp:

void roundrectitem::setbackground() {     changebackground = true;     update(); }  void roundrectitem::paint(qpainter *painter, const qstyleoptiongraphicsitem *option, qwidget *widget) {     qrectf rec = qrectf( qpoint( 0,0 ), boundingrect().size() / 2 );      roundrect = qrectf(rec.adjusted(-rec.height() / 2, 0, rec.height()/2, 0));      roundrect.moveto( boundingrect().center().x() - roundrect.width() / 2,                       boundingrect().center().y() - roundrect.height() / 2 );      if( !changebackground )         painter->setbrush( backbrush );     else         painter->setbrush( qbrush( qt::blue ) );      painter->setpen( qcolor( 255,255,255 ) );      painter->drawroundedrect(roundrect, roundrect.height() / 2, roundrect.height() / 2 ); }

so question is, how can make update() work right.

you invoking update() method of qgraphicsitem. should call update() of qgraphicsview working with. example can keep qgraphicsview member class of item like:

qgraphicsview * parent;

and call it's update method when want changes take place like:

void roundrectitem::setbackground() {     changebackground = true;     parent->update(); }

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