row height with QTreeView and delegates

[Philipp]

Hi,

I am using a QTreeView to display some data. One column is edited using a QComboBox, for which I created a delegate like in the "Spin Box Delegate (http://doc.trolltech.com/4.4/itemviews-spinboxdelegate.html)" example in the documentation. It all works great so far.
Unfortunately, the combo box's height is determined by the default row height of the QTreeView, which is too low.
I am able to add a sizeHint() method to the delegate, which is used by the view. But instead of setting a fixed height I'd like to use the sizeHint() of the combo box. The combo box is created inside createEditor() const method of the delegate, so I can't really use a class variable to store the size hint for later use. And I didn't find a method to get a an editor for a given ModelIndex either.
So am I thinking in the completely wrong direction or is there some other trick to it? I'm sure that's not the first case this has popped up, but I didn't find anything useful on Google.

Philipp

[Philipp]

Hm, I now did it that way:


QSize MyDelegate::sizeHint(const QStyleOptionViewItem & option,
const QModelIndex & index) const
{
return createEditor(0, option, index)->sizeHint();;
}


This way the editor is created twice, which isn't really great but at least it works without having to use
return QSize(x,y);.

Is there an easier and better way?

Philipp

[yuriry]

I'm not sure if there is a better way of doing this, but your MyDelegate::sizeHint() will be leaking memory if you do not delete the editor after calling its sizeHint(). Usually view takes this responsibility but you are not returning the editor to the view.

[Philipp]

yuriry, thanks for the hint, that's true indeed. But still doesn't give me a better solution to my problem ;(

[yuriry]

Have you had a chance to play with QTreeView::uniformRowHeights, QWidget::minimumHeight and QWidget::sizePolicy (the last two are for the editor)? Sorry, I cannot provide a better hint :(

[Lykurg]

Hi,

I am working on a similar problem without any solution at this time.


Hm, I now did it that way:

QSize MyDelegate::sizeHint(const QStyleOptionViewItem & option,
const QModelIndex & index) const
{
return createEditor(0, option, index)->sizeHint();;
}



How do you figure out, if an editor should be provided? Is this code not returning always the same sizeHint?


Lykurg

[aamer4yu]

What have u set the delegate on ???
On the treeview , or the combobox ?? if on combobox, HOW ??

[nifei]

I have the same problem, the delegate could not return the correct sizeHint when the editors' sizes vary.