On Mon, Sep 8, 2014 at 3:35 AM, Goffi <[email protected]> wrote: > G'day, > > In documentation of WidgetPlaceholder we can read this: > « This can be useful for making an interface with a number of distinct > pages or for showing and hiding menu or status bars. » > > But I don't exactly see how to do that: we can't use None for > original_widget, and there is no « invisible » widget.
When I wrote this I was thinking that you would switch between pages (a blank page would could be a SolidFill widget or similar) or you would use it to show a menu by using a Pile or Frame and then hide a menu by replacing that with just the widget below/frame body. I wasn't intending this as a way to make a widget hide itself from its parent. > So far to (un)hide menus and status bar, I was adding/removing them from > my containers, so now I wonder if there is not a better method with > WidgetPlaceholder... > > What is the best practice to (un)hide a widget ? I know some people have hidden widgets in Piles and ListBox widgets by replacing them with an empty Pile (which has 0 height). This seems to work but may not be well tested, and I'm not sure what happens if one of these widgets gets selected somehow. I'm pretty sure there's nothing similar for Columns to make a widget disappear. But you're asking about menus and status bars. I would use a WidgetPlaceholder subclass to wrap a widget that may have a menu or status bar. Add methods that show or hide the bar by swapping original_widget with a Pile or Overlay that includes the bar you want to show. If your status or menu bar is for the whole application your original_widget might be what was your topmost widget before. Ian _______________________________________________ Urwid mailing list [email protected] http://lists.excess.org/mailman/listinfo/urwid
