Re: [gtkmm] Gtk::ScrolledWindow add/remove problem

[Benoît Touron <B Touron citb bull net>]

Thanks for your answer.
I finaly used a Gtk::notebook, and it works well.
By the way I noticed that there is a Gtk::Widget::reparent method, 
allowing to move a widget from a container to another, avoiding the 
deletion of the widget. Maybe this is the solution.
Thanks
Ben

> Benoît Touron wrote:
>
>  > Hello again,
>  >
>  > I am writing an app using a pane window. In the left side, there is a 
>  > tree and in the right part a Gtk::ScrolledWindow.
>  > When the tree selection changes, I need to change the widget 
> contained > in the ScrolledWindow.
>  > To do this, I use m_scroll.remove(), and then m_scoll.add(newwidget).
>  > It works a couple of times (usually 3), then it crashes (access
>  > violation), in the add mathod.
>
>
> Well, I'm not an expert, but I have had the exact same problem, and 
> worked around it... My guess is that when you create the ScrolledWindow 
> with Gtk::manage(new ...), you make sort of a garbage collection thingy 
> for it. Then when you do m_scroll.remove(), the garbage collection 
> deletes it from memory. This means that when you switch once, and then 
> switch back, the program crashes because you try to insert a deleted 
> object.
>
> Whether I'm right or wrong here, I worked around it by simply removing 
> the Gtk::manage() around the creation of the ScrolledWindow instances.
>
> -Tor Arvid-
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