[FIXED] Show different color of drag and drop highlight when mouse is over or between items

Issue

In my ProxyStyle class, I have a drawPrimitive function where I check if element == QtWidgets.QStyle.PE_IndicatorItemViewItemDrop to draw a green line when the user drag and drop items in my TreeView.

I set the action so that the item can be drop between but not over. So I would like to change the color of the highlight like this: 1- line between item green (horizontal line) 2- line over item red (this line wraps the item).

Do you have an idea of how to do it? My drawPrimitive function have these arguments:

element(str)
option (QtGui.QStyleOptionViewItem)
painter(QtGui.QPainter)
widget (QtWidgets.QWidget)

Is there a flag like PE_IndicatorItemViewItemDrop that indicate if an item will be drop between or over?

Solution

According to the latest in Qt's 5.11 branch on github, the test is a simple height equals 0:

case PE_IndicatorItemViewItemDrop: {
    QRect rect = opt->rect;
    if (opt->rect.height() == 0)
        p->drawLine(rect.topLeft(), rect.topRight());
    else
        p->drawRect(rect);
    break; }

Your code should use the same test to decide which color to use. If option.rect.height == 0 then Qt::green else Qt::red. Copy the current QPen and change its color, then call the base class' drawPrimitive. The following pseudocode should suffice:

lastPen = painter.pen()
myPen = QtGui.QPen(lastPen)
if (option.rect.height() == 0):
    myPen.setColor(Qt.green)
else:
    myPen.setColor(Qt.red)
painter.setPen(myPen)
QProxyStyle.drawPrimitive(self, element, option, painter, widget)
painter.setPen(pen)

Sorry if the code is ugly. I don't know PySide, just C++ Qt.

Answered By - walkingTarget