QItemDelegate enter event

[bunjee]

The following doesn't work with a QItemDelegate:

bool ZeChatServer_delegate::editorEvent(QEvent *event, 
										QAbstractItemModel *model, 
										const QStyleOptionViewItem &option, 
										const QModelIndex &index)
{
        if (event->type() == QEvent::Enter)
	{
		std::cout << "Tac tac\n";
 
		return true;
	}
	return false;
}

bool ZeChatServer_delegate::editorEvent(QEvent *event, 
										QAbstractItemModel *model, 
										const QStyleOptionViewItem &option, 
										const QModelIndex &index)
{
        if (event->type() == QEvent::Enter)
	{
		std::cout << "Tac tac\n";

		return true;
	}
	return false;
}

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How am I supposed to proceed to catch the enter / leave event of a QItemDelegate ?
Thanks.

[wysota]

You should check for QStyle::State_MouseOver flag in QStyleOptionViewItem and set the WA_Hover attribute for the viewport to receive paint requests for hover events.

[bunjee]

I did that :

mListView->viewport()->setAttribute(Qt::WA_Hover, true);
mListView->viewport()->setMouseTracking(true);
 
void ZeChatServer_delegate::paint(QPainter *painter, 
								  const QStyleOptionViewItem &option, 
								  const QModelIndex &index) const 
{
    QItemDelegate::paint(painter, option, index);
 
	if (option.state == QStyle::State_MouseOver)
	{
		std::cout << "Tac tac\n";
	}
}

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

void ZeChatServer_delegate::paint(QPainter *painter, 
								  const QStyleOptionViewItem &option, 
								  const QModelIndex &index) const 
{
    QItemDelegate::paint(painter, option, index);

	if (option.state == QStyle::State_MouseOver)
	{
		std::cout << "Tac tac\n";
	}
}

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Not working so far.

Edit :
Solved :

if (option.state & QStyle::State_MouseOver)

if (option.state & QStyle::State_MouseOver)

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[bunjee]

Ok now I have a new problem:

How am I supposed to know when the cursor has left the Item ?
I have a problem with my button, it stays sunken when the cursor goes out of the item while clicking.

[bunjee]

I did some research and found this :

void QAbstractItemView::entered ( const QModelIndex & index )

unfortunately there is no "left" signal.
Anyone ?

[bunjee]

According to JPN:

For a QTableView you would connect to signals like:
void QAbstractItemView::doubleClicked ( const QModelIndex & index )
void QAbstractItemView::entered ( const QModelIndex & index )

I don't see any particular signal for leaving an item. But of course you can save row/col or a persistent index for the previously colourized cell and uncolourize during the entered signal of another item and possibly leave event of the whole table view.

I guess that's the direction I'll move forward to. Even if I find it unconvenient.

[wysota]

If you are only after colouring the item, why not do it like this?

#include <QtGui>
 
class Delegate : public QItemDelegate {
public:
  Delegate(QObject *parent=0) : QItemDelegate(parent){}
  void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const {
    if(option.state & QStyle::State_MouseOver){
        painter->fillRect(option.rect, Qt::red);
    }
    QItemDelegate::paint(painter, option, index);
  }
};
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  QTableView tv;
  tv.viewport()->setAttribute(Qt::WA_Hover);
  QStandardItemModel model(8,8);
  tv.setModel(&model);
  tv.setItemDelegate(new Delegate(&tv));
  tv.show();
  return app.exec();
}

#include <QtGui>

class Delegate : public QItemDelegate {
public:
  Delegate(QObject *parent=0) : QItemDelegate(parent){}
  void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const {
    if(option.state & QStyle::State_MouseOver){
        painter->fillRect(option.rect, Qt::red);
    }
    QItemDelegate::paint(painter, option, index);
  }
};

int main(int argc, char **argv){
  QApplication app(argc, argv);
  QTableView tv;
  tv.viewport()->setAttribute(Qt::WA_Hover);
  QStandardItemModel model(8,8);
  tv.setModel(&model);
  tv.setItemDelegate(new Delegate(&tv));
  tv.show();
  return app.exec();
}

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