How do I obtain mouse hover/popup functionality in a Qtableview?

[georgep]

Hi,

i am using a Qtableview to display data in table form, what classes do I need to use/subclass so that when I hover the mouse over an item I can display some image.
Basically i want to see the picture in decorationRole, only bigger, so hovering over the cell with the mouse would be perfect.

Does QWidget::mouseMoveEvent ( QMouseEvent * event ) help me in any way?

thank you.

[wysota]

QAbstractItemDelegate::editorEvent() and enabling WA_Hover attribute for the viewport of the view are the way to go.

[georgep]

should I use QHoverEvent ?

[wysota]

Yes, viewport

Yes, it will work like this - you have to react on enterEvent and leaveEvent probably.

[georgep]

haha, sorry for the rewrite, i just had figured it out and didnt see your reply

im using QEvent::Hoverenter but apparently its behaving like HoverMove...ie: if I move the mouse in the cell.. it still "fires"


thanks for the replys!

[wysota]

Use QEvent::Enter and QEvent::Leave.

[georgep]

I set the delegate on a column (view->setItemDelegateForColumn(1, new BoxDelegate(this) ); ) ...but somehow when entering the mouse over the column I dont get Enter of leave, i get MouseMove... dont understand why yet....



ps: someone should have told me to RTFM the "Events and Event Filters" article in Assistant.

[wysota]

Did you set the hover attribute on the view's viewport?

[georgep]

view->setMouseTracking(true);
view->viewport()->setAttribute(Qt::WA_Hover,true);
 
 
 
bool BoxDelegate::editorEvent ( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index )
{
 
      qDebug()<<index.row();
      if ( event->type() == QEvent::HoverEnter ) { qDebug()<<"enter...";  } // doesnt appear.   (it does on mousemove)
 
      return 0;
}

view->setMouseTracking(true);
view->viewport()->setAttribute(Qt::WA_Hover,true);



bool BoxDelegate::editorEvent ( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index )
{
      
      qDebug()<<index.row();
      if ( event->type() == QEvent::HoverEnter ) { qDebug()<<"enter...";  } // doesnt appear.   (it does on mousemove)
    
      return 0;
}

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[wysota]

If you want to enable mouse tracking, you have to do it on the viewport as well (then you'll receive enter and leave events). But it's not required. After taking a closer look on a working example I think you don't need to react on QEvent::Enter or QEvent::Leave. Just reimplement paint() and check whether the mouse is currently hovering over your item.

[georgep]

I tried view->viewport()->setMouseTracking(true); but I still dont get any enter or Leave
About reimplementing paint, is there any example somewhere that shows how to see if mouse is over something?