The function QGraphicsScene::itemAt problem

[yaseminyilmaz]

Hi all,

I've created a custom class (named as Flow) inherited by QGraphicsItem. It's composing of an arrow and curve. I've used the function itemAt to determine which item has selected when QGraphicsScene::mousePressEvent is called. But it does not always return correct item. Otherwise I've written the folllowing function for manual detection. It's working correctly. But I want to learn why sometimes QGraphicsScene can not detect item selected by pressing mouse? Is there a more sensible method than manual point control?

int getMatchedFlow(QPointF pos)
{
    int fID = -1;
    QList<Flow*> mFlowList = mGroupStore.keys();
    QList<Flow*>::iterator i;
    Flow *pFlow;
 
    for (i = mFlowList.begin(); i != mFlowList.end(); ++i)
    {
        pFlow = (Flow*)*i;
        if (pFlow->checkPointSet(pos))
        {
            fID = pFlow->getID();
            break;
        }
    }
 
    return fID;
}
 
bool Flow::checkPointSet(QPointF point)
{
    bool rc = false;
 
    if (mBoundingPath.contains(point))
    {
        rc = true;
    }
 
    return rc;
}

int getMatchedFlow(QPointF pos)
{
    int fID = -1;
    QList<Flow*> mFlowList = mGroupStore.keys();
    QList<Flow*>::iterator i;
    Flow *pFlow;

    for (i = mFlowList.begin(); i != mFlowList.end(); ++i)
    {
        pFlow = (Flow*)*i;
        if (pFlow->checkPointSet(pos))
        {
            fID = pFlow->getID();
            break;
        }
    }

    return fID;
}

bool Flow::checkPointSet(QPointF point)
{
    bool rc = false;

    if (mBoundingPath.contains(point))
    {
        rc = true;
    }

    return rc;
}

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Thanks a lot for your helps,