How to destroy an object right

[Cruz]

I still don't have full control of it. I'm trying to clear a layout from widgets. In the documentation it says

QLayoutItem * child;
while ((child = layout()->takeAt(0)) != 0)
{
	delete child;
}

QLayoutItem * child;
while ((child = layout()->takeAt(0)) != 0)
{
	delete child;
}

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would safely clear a layout. When I use this, the widgets still stay on the screen. So I figure I need to cast the QLayoutItem* pointers to pointers to widgets of my kind, say MyWidget*. When I do that before deleting, the program crashes. Do I need to cast here actually?

Before I saw this in the documentation, I used an approach based on removeWidget(widget), but for that I need to keep a list of pointers to the widgets I added to the layout. It would be much more elegant to rely on the list of pointers that the layout itself is keeping.

[jpn]

QLayoutItem represents an item in the layout. It's not a pointer to the widget. See QLayoutItem::widget(). But what are you actually trying to do? These kind of layout modifications tend to be problematic in terms of flickering etc. Perhaps you could just use a QStackedWidget?

[Cruz]

I have a lot of QFrames coming in from an external source. They are placed on a widget say in a frame pool, so that the user can select a few of them and drag them somewhere else. After that the pool is cleared and new frames are coming in. So I'm looking for a short way to clear out the pool and the takeAt() method came to my attention.

Thanks for the hint, it works really well now. There is no flicker and I don't need to maintain an internal data structure to keep track of the frames.