mouseDoubleClickEvent on QGraphicsItem's

[been_1990]

How can I check for a double-click on my items?

[yogeshgokul]

How can I check for a double-click on my items?
What items? :confused::confused:

[wagmare]

bool QGraphicsItem::sceneEvent ( QEvent * event )

event is QEvent::GraphicsSceneMouseDoubleClick

[been_1990]

How exactly do I use that?

[navi1084]

why cant you re-impliment "void mouseDoubleClickEvent ( QGraphicsSceneMouseEvent * event ) ".

To use sceneEvent(), u should first register the item for which u need all the events and filter the events.
To register you can use "void installSceneEventFilter ( QGraphicsItem * filterItem )".
and override bool sceneEvent ( QEvent * event ) and filter the events which you need..

[been_1990]

wow..... maybe an example? Thats a litle beyond me.

[wagmare]

see the previous to last post of this thread
http://www.qtcentre.org/forum/f-newbie-4/t-catch-pressed-keys-22921.html

[been_1990]

bool RecRepView:: eventFilter(QObject *ob, QEvent *e)
{
if(e->type() == QEvent::KeyPress){
printf("is it coming inside event..\n");
const QKeyEvent *ke = static_cast<QKeyEvent *>(e);
if(ke->key()==Qt::Key_F1){
qApp->quit();
printf("Logout buttin clicked..\n");
}
return true;
}
return QWidget::eventFilter(ob, e);
}

Ok. So just by having this function it gets called automatically every time QObject *ob receives an event?
Or do I still need signals/slots?

[wagmare]

e->type() == QEvent::KeyPress
instead u use

e->type() == QEvent::GraphicsSceneMouseDoubleClick

and inside the condition u can do any thing .. display a alert message dialog or emit a signal or return a statement ..etc ..

[been_1990]

so I'll use the function like ? :

eventFilter(myGraphicsItem, QEvent *e);

[wagmare]

so I'll use the function like ? :

eventFilter(myGraphicsItem, QEvent *e);

:confused: why u have to use function like eventFilter(myGraphicsItem, QEvent *e) ...!

its a virtual function reimplement the virtual function in your QGraphicsView class and install this event filter in your QGraphicsScene() of the view ..

see the link
http://doc.trolltech.com/4.3/eventsandfilters.html#event-filters

[been_1990]

Okay. Now my mind cleared up. Thanks for the help, my problem is solved.Tx.