I have a QTreeView (actually a QTreeWidget) with multiple selection and drag
and drop but I want to disable the 'drag and select' behaviour (i.e. if you
click and drag an item which is not itself draggable, the selection is extended
to include the items that you mouse over). I still want the shift and ctrl
behaviours to work, just not the drag-selection but there is no public API to
disable this behaviour.
The code to is buried inside QAbstractItemView and is dependent on the
QAbstractItemView 'state' so I came up this:
void MyTreeWidget::mouseMoveEvent(QMouseEvent *evt)
{
const QTreeWidgetItem *item = itemAt(m_startDragPt);
if (!item)
{
// if the user clicked in empty space, ignore
the move event to avoid extending the selection
return;
}
// prevent drag-selection behavior by assuming all mouse-moves
at this stage initiate a drag;
// this overrides the code in QAbstractItemView::mouseMoveEvent
which extends the selection
setState(QAbstractItemView::DraggingState);
// pass event to base class to allow drags etc
QTreeWidget::mouseMoveEvent(evt);
}
This disables the drag-selection by fooling the view into thinking that each
mouse move is actually a drag. But it causes other problems; other widgets do
not get a mouse leave event if I mouse over them after QDrag.
How can I disable this behaviour?
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