Find the item under the mouse press

[sajis997]

Hello forum,


I am over-ridden the mousePressEvent(QGraphicsSceneMouseEvent) of the QGraphicsScene and doing the following to find if there is any item under the mouse press or not:

QGraphicsItem *item = itemAt(event->pos());
 
if(item)
cout << "Item found under the mouse press " << endl;

QGraphicsItem *item = itemAt(event->pos());

if(item)
cout << "Item found under the mouse press " << endl;

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When i drag the item into the scene i can see that there is an item, the mousePressEvent() is not detecting it. Is there any basic logic that i am missing ?


Thanks
Sajjad

[helloworld]

Not sure this is the problem but in case you have subclassed QGraphicsItem, make sure that the boundingRect() of your graphics item is correct.

[sajis997]

Not sure this is the problem but in case you have subclassed QGraphicsItem, make sure that the boundingRect() of your graphics item is correct.

I think the boundingRect() is fine. I am trying to extend the demo that comes along with the Qt installation - diagramscene.
The examples already over-rides the mousePressEvent() and i have just added the condition as mentioned in the previous post at the end of the function.


Any other hint?



Regards
Sajjad

[norobro]

Use a qDebug() statement:

qDebug() << event->pos()

qDebug() << event->pos()

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event->pos() is not what you want. Look in the docs for alternatives.

Any other hint?

On what type of object you are calling itemAt()?

[sajis997]

Use a qDebug() statement:

qDebug() << event->pos()

qDebug() << event->pos()

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event->pos() is not what you want. Look in the docs for alternatives.


On what type of object you are calling itemAt()?

DiagramItem *item = qgraphicsitem_cast<DiagramItem*>(itemAt(event->pos()));

DiagramItem *item = qgraphicsitem_cast<DiagramItem*>(itemAt(event->pos()));

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And the event type is the QGraphicsSceneMouseEvent .

[/code]

[norobro]

You are trying to locate an item in a scene so try:

QGraphicsItem *item = itemAt(event->scenePos())

QGraphicsItem *item = itemAt(event->scenePos())

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