Re: [gtkmm] itīs driving me mad ... (replacing contents of VBox)

[Martin Schulze <martin-ml hippogriff de>]

Am 2004.02.15 16:48 schrieb(en) Andreas B. Thun:
> Hi!
>
> I have a problem here I just cannot solve:
> VBox myBox is containing some widgets1..3 I show
> first.
> Later in my program (windows stays the same), I build
> a new VBox to display widgets4..5 instead, but the widgets1..3
> stay displayed!
>
> Can somebody throw light on this?
>
>
>
> .h:
> Gtk::VBox *myBox; // Pointer to VBox I want to display
>
> .cpp:
>
> // 1st object of VBox holds widgets1..3 and shows them -> fine
> myBox = Gtk::manage(new Gtk::VBox());
> myBox->pack_start(widget1);
> myBox->pack_start(widget2);
> myBox->pack_start(widget3);
> myBox.show();

(Note that myBox.show() doesn't make widget1..3 visible. Use
show_all() instead.)

> ...
>
> // Assigning the new VBox to the Pointer myBox
> // but the new widgets are not displayed!!
> myBox = Gtk::manage(new Gtk::VBox());

You assign a pointer, but you don't change the widget tree.
You must first remove the old VBox and then add the new one
to the parent widget. To remove and destroy a widget use
delete. (I'm not sure whether this works with Gtk::manage() -
you'll have to try.)

Regards,

 Martin


> myBox->pack_start(widget4);
> myBox->pack_start(widget5);
> myBox->pack_start(widget6);
> myBox.show();
>
>
> TIA,
> Andi
>
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