QTreeWidgetItem sizeHint returning QSize(-1,-1)

Crag_Hack

Doesn't that imply sizehint should return an ideal size for the column of a qtreewidgetitem? Which should be adequate for my purposes.

SGaist

What is exactly your purpose ?

Crag_Hack

I just want to set a tooltip for qtreewidgetitems whose text does not fit in the column.

SGaist

So you would like the column to resize so your tooltip fits in ?

Crag_Hack

A tooltip is where you hover the mouse over an item and a text window pops up right? So if the text doesn't fit in the column the user can hover over the qtreewidgetitem column and see the full text without resizing the column.

SGaist

So, in fact, you would like to show the full content of a cell in a QToolTip ?

Crag_Hack

Exactly. And only for cells that dont fit the entire text in the column.

VRonin

so what you want is probably to use setData on the widget item to set the Qt::ToolTipRole at the same value as main cell content. this will solve the " you would like to show the full content of a cell in a QToolTip" part

for the "only for cells that dont fit the entire text in the column" part you have to subclass QTreeWidget, reimplement viewportEvent(QEvent *event) so that if the event type is Qt::ToolTip you check if it fits using sizeHintForIndex if it does reject the event otherwise just call the base class implementation

SGaist

Correct me if I'm wrong but if I understand the situation correctly, you would like to resize the column to show a tooltip for something that doesn't fit in the cell within that cell. So in the end, the cell would be large enough to show the complete data, no ?

VRonin

I interpreted as he wants something like this (cursor is in sizePolicy row, Value column)

ExampleImage

Crag_Hack

VRonin you are sport on :) Thanks guys

Crag_Hack

A small speed bump... how do I obtain the index from the viewportEvent reimplementation? Also what's up with the treewidgetitem sizehint giving -1?

Crag_Hack

I tried indexAt(QCursor::pos())... The code I used is on the bottom. For the qDebug() I get this:

QVariant(Invalid) -1 100

So it looks like the same freakin problem with sizehint... I also tried this->currentIndex() instead of indexAt with the same results. Time to throw the computer out of the window!

bool TreeFileDir::viewportEvent(QEvent *event)
{
    if (event->type() == QEvent::ToolTip)
    {
        qDebug() << indexAt(QCursor::pos()).data(Qt::DisplayRole) << sizeHintForIndex(indexAt(QCursor::pos())).width() << columnWidth(0);
        if (sizeHintForIndex(indexAt(QCursor::pos())).width() <= columnWidth(0))
            return true;
        else
            return false;
    }
    QTreeWidget::viewportEvent(event);
}