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Qt4-preview-feedback Archive, March 2008
qt44-20080312: QGraphicsItem hover events

Message 1 in thread

I compiled:  qt-x11-commercial-src-4.4.0-snapshot-20080312 and compiled
tested my
application with this version.

Now it seems that the QGraphicsItem hoverEvents do not work anymore.
The hover event works correctly (how I expect them to work) with Qt 4.3.2 /
Qt 4.3.4.

I use the hoverEvent to change the cursor when moving over an item like:

JQItem::JQItem() : QAbstractGraphicsShapeItem()
{
   setAcceptsHoverEvents(true);
   setFlag(ItemIsSelectable);
   setFlag(ItemIsMovable);
   ...
}

void
JQItem::hoverEnterEvent(
   QGraphicsSceneHoverEvent *
)
{
   setCursor(Qt::SizeAllCursor);
}

void
JQItem::hoverLeaveEvent(
   QGraphicsSceneHoverEvent *
)
{
   unsetCursor();
}

It seems that these hover members are not called anymore. Any idea what can
be the problem?
Message 2 in thread

Henk Jan Priester wrote:> I compiled: 
qt-x11-commercial-src-4.4.0-snapshot-20080312 and compiled
> tested my
> application with this version.
> Now it seems that the QGraphicsItem hoverEvents do not work anymore.
> The hover event works correctly (how I expect them to work) with Qt 4.3.2
> / Qt 4.3.4.

Hi, Henk. Could you please try to isolate this problem, and post a
standalone program that reproduces the bug?

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Message 3 in thread

2008/3/14, Andreas Aardal Hanssen <ahanssen_replytolistplease@xxxxxxxxxxxxx
>:
>
> Henk Jan Priester wrote:> I compiled:
>
> qt-x11-commercial-src-4.4.0-snapshot-20080312 and compiled
> > tested my
> > application with this version.
> > Now it seems that the QGraphicsItem hoverEvents do not work anymore.
> > The hover event works correctly (how I expect them to work) with Qt
> 4.3.2
> > / Qt 4.3.4.
>
>
> Hi, Henk. Could you please try to isolate this problem, and post a
> standalone program that reproduces the bug?


Andreas,

I verified with a simple example program I used for 144734 but that works
fine.

What I see in the code is there is a big difference between 4.3 and 4.4.
I my program have implemented my own:
QGraphicsScene::mouse{Press/Move/Release}Event functions
which are not calling the default implementation.
In 4.4 it looks that an hoverEvent might be generated in the
QGraphicsScene::mouseMoveEvent function.
Could that explain why it does not work?

If I have some time I can try to make a example.

Henk Jan

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Message 4 in thread

2008/3/14, Andreas Aardal Hanssen <ahanssen_replytolistplease@xxxxxxxxxxxxx
>:
>
> Henk Jan Priester wrote:> I compiled:
>
> qt-x11-commercial-src-4.4.0-snapshot-20080312 and compiled
> > tested my
> > application with this version.
> > Now it seems that the QGraphicsItem hoverEvents do not work anymore.
> > The hover event works correctly (how I expect them to work) with Qt
> 4.3.2
> > / Qt 4.3.4.
>
>
> Hi, Henk. Could you please try to isolate this problem, and post a
> standalone program that reproduces the bug?


I have created a simple program. The problem is caused I have implemented
QGraphicsScene::mouseXXX routines.
In this example these are just dummy routine but I my program they do
actualy something.
(needed undo/redo on move/resize operations, needed a different ways for
selecting elements)

When using 4.3.4 the hoverEvent for the item are generated and when using QT
4.4 20080312 they
are not generated.

Henk Jan



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Attachment: qrect.tgz
Description: GNU Zip compressed data

Message 5 in thread

Henk Jan Priester wrote:
> 2008/3/14, Andreas Aardal Hanssen
>> Hi, Henk. Could you please try to isolate this problem, and post a
>> standalone program that reproduces the bug?
> When using 4.3.4 the hoverEvent for the item are generated and when using
> QT 4.4 20080312 they
> are not generated.

Hi, Henk. Sorry for the late answer, I'll look at this and get back to you
with an answer.

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