Qt-interest Archive, January 2007
QTreeView ToolTips on a Mac
Message 1 in thread
Hi,
I had an interesting phenomenon today that I wanted to share with you.
Maybe you can clarify this for me.
Ok. So I got a QTreeView and want tool tips on its items.
Documentation says
(.../Qt-4.2.0/doc/html/widgets-tooltips.html) that I should re-implement
event(QEvent * mpEvent), which I did to the t:
// Tooltip
bool MyTreeView::event(QEvent * mpEvent)
{
if (mpEvent -> type() != QEvent::ToolTip)
{
return QTreeView::event(mpEvent);
}
QHelpEvent * help = dynamic_cast < QHelpEvent * >(mpEvent);
QModelIndex index = indexAt(help -> pos());
qDebug() << index;
return true;
}
What I expected to see was the the index of the item below the mouse
cursor being
dumped. But no such luck: The item _below_ the item under the mouse
cursor is being
dumped! So I decided to look a little deeper into it, and I found out
that help -> pos()
for some reason beyond me returns the wrong position. It does not
take the header() into
account -- so I did:
QPoint mypos = help -> pos();
mypos.setY(mypos.y() - header() -> height());
QModelIndex index = indexAt(mypos);
This works just fine.
But please enlighten me:
a) Can you reproduce this behavior?
b) Is this expected behavior, ie. did I do something wrong? Or is it
a bug?
QT Version is 4.2.0, and I'm on MacOS.
Thanks a lot in advance,
Shimaron
--
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Message 2 in thread
I don't know about your specific problem, but QTreeView shouldn't
have to be overridden to show tool tips. Ideally, your model will
provide an appropriate value for the Qt::ToolTipRole in the data()
method. This works as expected on OS X.
Jason
On Jan 23, 2007, at 1:19 PM, Shimaron Greywolf wrote:
> Hi,
>
> I had an interesting phenomenon today that I wanted to share with you.
> Maybe you can clarify this for me.
>
> Ok. So I got a QTreeView and want tool tips on its items.
> Documentation says
> (.../Qt-4.2.0/doc/html/widgets-tooltips.html) that I should re-
> implement
> event(QEvent * mpEvent), which I did to the t:
>
> // Tooltip
> bool MyTreeView::event(QEvent * mpEvent)
> {
> if (mpEvent -> type() != QEvent::ToolTip)
> {
> return QTreeView::event(mpEvent);
> }
>
> QHelpEvent * help = dynamic_cast < QHelpEvent * >(mpEvent);
> QModelIndex index = indexAt(help -> pos());
>
> qDebug() << index;
>
> return true;
> }
>
>
> What I expected to see was the the index of the item below the
> mouse cursor being
> dumped. But no such luck: The item _below_ the item under the mouse
> cursor is being
> dumped! So I decided to look a little deeper into it, and I found
> out that help -> pos()
> for some reason beyond me returns the wrong position. It does not
> take the header() into
> account -- so I did:
>
> QPoint mypos = help -> pos();
> mypos.setY(mypos.y() - header() -> height());
> QModelIndex index = indexAt(mypos);
>
> This works just fine.
>
> But please enlighten me:
>
> a) Can you reproduce this behavior?
> b) Is this expected behavior, ie. did I do something wrong? Or is
> it a bug?
>
> QT Version is 4.2.0, and I'm on MacOS.
>
> Thanks a lot in advance,
>
> Shimaron
>
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--
[ signature omitted ]
Message 3 in thread
Hi Jason,
that is a very good point! Did so, purrs like a kitten. I wonder why
the aforementioned
Documentation does not point this out and in fact suggests re-
implementing event()...
Anyway, this solves my problem. Thanks a bunch!
Shimaron
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[ signature omitted ]
