CODEWITHSUNDEEP
c++qt
ted
ted

Reputation: 4975

QAbstractItemDelegate hover and (re)paint

I am trying to implement my own QAbstractItemDelegate for a table view. I added a mouseover effect, however, I have two issues:

1. My Mouseover detection is buggy
2. The Item delegate needs additional repaints, I do not know how to trigger repaints.

Mouseover problem

I try to detect when the mouse hovers over my delegate with the following code in paint:

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

    if (painter->window().contains(option.widget->mapFromGlobal(QCursor::pos()))) {
        // ...
    }
}

This leads to the rectangle extending over other cells in columns after the actual column and detecting if the mouse is over those columns as well. I tried options.rect as well, but this rectangle seemed to be shifted above my actual cell.

Additional Repaints

For some reason the widget is automatically repainted when the cursor enters the widget, but not when the mouse leaves. This results in the widget getting stuck in the hover state, unless I force a redraw by sliding another window across the area.

While I can detect when the mouse enters/leaves my widget witht the following code, I do not know how to trigger a repaint of my widget. Since I do not inherit from QWidget I do not have update() available, and I do not know how to obtain the QPainter to call paint. How do I trigger repaints?

bool myClass::editorEvent(QEvent* event, QAbstractItemModel* model, const QStyleOptionViewItem& option, const QModelIndex& index) {
    switch(event->type()) {
    case QEvent::Enter:
    case QEvent::HoverEnter:
            std::cout << "+" << index.row() << std::endl;
            break;
    case QEvent::Leave:
    case QEvent::HoverLeave:
            std::cout << "+" << index.row() << std::endl;
            //paint(, option, index);
            break;
    }   
    return false;
}

Upvotes: 2

Views: 2632

Answers (1)

Evgeny
Evgeny

Reputation: 4010

Check if mouse over you can like this:

bool hover = option.state & QStyle::State_MouseOver

Repainting is not the item delegate task but view's. So you should detect mouse leave event at your view and call update() there. It will triggers repainting view's delegates.

Upvotes: 5

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