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

[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?

[wysota]

See QStyleOption::state.

[georgep]

In the paint implementation :

void BoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const

void BoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const

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using qdebug()<<option.state; i am able to "see" a QStyle::State_MouseOver State, but in the

bool BoxDelegate::editorEvent ( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index )

bool BoxDelegate::editorEvent ( QEvent * event, QAbstractItemModel * model, const QStyleOptionViewItem & option, const QModelIndex & index )

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implementation, i dont.. why is this?

[wysota]

Probably because it's irrelevant there.

[georgep]

just one small unrelated question
Can i show images (.jpg,.gif) that are stored as BLOB in mysql directly in a qtableview ?

[wysota]

Depends what you mean by "directly". You have to read them from the database and create pixmaps out of them. Once you do that, you can show the images in a widget.

[georgep]

I hope i get lucky and someone tells me where im screwing up so I dont have to open yet another thread...


I have a
model = new QSqlRelationalTableModel(this);
which gets data from mysql. I also have a myView subclass from QTableView.


If I :
model->setData(model->index( 1 ,1) , QPixmap(":/images/new.png"), Qt:ecorationRole);
I would expect that the decoration role icon would become visible in the tableview, but it doesnt ( What do I have to do to get the icon to show ? Am i forced to subclass the model ? Isnt there any other way ?
I tryed to reimplment paint() but with no luck ....
(PS: the pixmap and resource exist/work)

[wysota]

SQL models don't support decorationRole out of the box. You have to subclass the model and introduce support for it by reimplementing data(), setData() and adding some container for storing the icons.