Question

I have this code in a slot function.

QCursor cur=this->cursor();
QMenu* pRightKeyMenu=new QMenu(this);
pRightKeyMenu->popup(cur.pos());  

When I click the right mouse key, it will be invoked. After that, I find that memory is going up up up… and never goes down. How can I fix that?

Answer 1

The variable pRightKeyMenu is leaking because you’re not releasing it.

One possible solution is to reuse it, since, by your code, the created QMenu is always the same:

Widget::Widget()
{
    // ...
    this->pRightKeyMenu = new QMenu(this);
}

// Slot
void Widget::contextMenu()
{
    QCursor cur=this->cursor();
    this->pRightKeyMenu->popup(cur.pos());
}