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Qt-interest Archive, April 2007
Tooltips on QGraphicsItems

Message 1 in thread

Hi,

Is there an easy way to display a tooltip for a QGraphicsItem only when 
the user hovers over the actual painted pixels, but not on the 
transparent areas? It seems that creating a QGraphicsRectItem with an 
outline only, provides a tooltip even inside the unpainted region.

I could do it with a custom hover events handler, but I wonder if there 
is some qpainter associated parameter that affects this or another way I 
am not aware of.

thanks in advance,
--stathis

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Message 2 in thread

Hi Stathis,

Stathis schrieb:
> Hi,
>
> Is there an easy way to display a tooltip for a QGraphicsItem only 
> when the user hovers over the actual painted pixels, but not on the 
> transparent areas? It seems that creating a QGraphicsRectItem with an 
> outline only, provides a tooltip even inside the unpainted region.
>
> I could do it with a custom hover events handler, but I wonder if 
> there is some qpainter associated parameter that affects this or 
> another way I am not aware of.
did you also try to overwrite shape() to return the correct outline 
instead of boundingRect()?
http://doc.trolltech.com/4.2/qgraphicsitem.html#shape
This is in other cases used to have finer control when an item is hit, 
so why not here? I think it's worth a try...

Good Luck,
Daniel
>
> thanks in advance,
> --stathis
>
> -- 
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with 
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Message 3 in thread

Daniel Walz wrote:
> Hi Stathis,
> 
> Stathis schrieb:
>> Hi,
>>
>> Is there an easy way to display a tooltip for a QGraphicsItem only
>> when the user hovers over the actual painted pixels, but not on the
>> transparent areas? It seems that creating a QGraphicsRectItem with an
>> outline only, provides a tooltip even inside the unpainted region.
>>
>> I could do it with a custom hover events handler, but I wonder if
>> there is some qpainter associated parameter that affects this or
>> another way I am not aware of.
> did you also try to overwrite shape() to return the correct outline
> instead of boundingRect()?
> http://doc.trolltech.com/4.2/qgraphicsitem.html#shape
> This is in other cases used to have finer control when an item is hit,
> so why not here? I think it's worth a try...
> 
> Good Luck,
> Daniel
>>
>> thanks in advance,
>> --stathis
>>
>> -- 
>> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
>> "unsubscribe" in the subject or the body.
>> List archive and information: http://lists.trolltech.com/qt-interest/
>>
> 
> 

Hi Daniel,

Thanks for replying, this was a good hint! For anyone who may look back
to the thread for a solution, here is how I made only the outline of my
rectangle trigger the tooltip:

QPainterPath shape() const
{
   // This will defines the shape of the item
   // In this case a simple rectangle
   QPainterPath shapePath;
   shapePath.addRect( boundingItem->rect() );

   // This will create and return a new path by outlining
   // the shape of the item defined before.
   QPainterPathStroker outlinePath;
   outlinePath.setWidth( thickness );

   return outlinePath.createStroke ( shapePath );
}


Thanks again.

regards,
stathis



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