Re: Help removing widgets

["Marco Scholten" <mscholtn xs4all nl>]

On Mon, 27 Feb 2006 08:55:22 -0700, Mike <mike geekgene com> wrote:

> Hello,
>
> I can't find very much coverage of how this actually should work, and  
> it's
> giving me a lot of troubles.  If anyone would help it'd be greatly
> appreciated.
>
> I have a program setup with a HPaned in a window.  The content in the  
> seccond
> panel (the right side) needs to be swapped out for another widget when  
> the
> user clicks a button.
>
> So far I have tried several different approaches and no matter what I do  
> it
> either crashes, seems to delete the HPaned but keep the left side, or  
> both.
>
> I've been able to reproduce the behaviour in a simpler case using labels:
>
> class MainWnd : public Gtk::Window
> {
> protected: // Widgets
> 	Gtk::HPaned m_hpMainDiv;
> 	Gtk::Label *m_lRightText;
> 	Gtk::Button m_btnChange;
> 	
> public:
> 	void on_change()
> 	{
> 		m_hpMainDiv.remove( *m_lRightText );
> 		delete m_lRightText;
> 		m_lRightText = new Gtk::Label("New right text...");
> 		m_hpMainDiv.add2( *m_lRightText );
> 	}
>
> 	// constructor etc omitted...
> };

You do correctly remove the old label and add a new one, but you forget
to show the newly added label, adding:
m_hpMainDiv.show_all_children();
after adding the new label will fix that.


> There we go, on_change is the handler called when you click the button  
> on the
> left.  I've tried a few different ideas I found searching this mailing  
> list,
> including "unparent" and "reference".  Nothing seems to help.
>
> Thanks a lot,
> --Mike
>
> P.S.  I'm having similar difficulty removing pages from a notebook and  
> adding
> other pages...this shouldn't be this difficult, I think I'm missing  
> something
> fundamental.
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