From: "richard.j.dale@..." <richard.j.dale@...>
Date: 2006-11-18T16:50:08+09:00
Subject: Re: qtruby and the ListViewItemIterator


Vincent Fourmond wrote:
> Nigel Wilkinson wrote:
> > Hi folks
> >
> > I'm trying qtruby out and have struck an issue I can't conquer.
> >
> > I have a listview widget which is populated with listviewitems and want
> > to iterate through the whole lot.
> >
> > The code snippet is
> >
> > it = Qt::ListViewItemIterator.new(@listView)
> > puts it.operator++()
>
> > /mainform.ui.rb:33:in `method_missing': undefined method `operator' for
> > #<Qt::ListViewItemIterator:0xb6c08c24> (NoMethodError)
>
>   Well, the operator ++ is meant to be called directly ++ when written
> in C++. In ruby, however, that won't work as ++ is not an operator.
>   You might want to try (untested):
>
> p it.send(:'++')
No, that won't work. You need to use 'it += 1' instead in QtRuby:

irb(main):002:0> lv = Qt::ListView.new
=> #<Qt::ListView:0xb79e1dac name="unnamed", x=320, y=240, width=640,
height=320>
irb(main):003:0> item1 = Qt::ListViewItem.new(lv)
=> #<Qt::ListViewItem:0xb79dbe70>
irb(main):004:0> item2 = Qt::ListViewItem.new(lv)
=> #<Qt::ListViewItem:0xb79d8180>
irb(main):005:0> item3 = Qt::ListViewItem.new(lv)
=> #<Qt::ListViewItem:0xb79d3054>
irb(main):006:0> it = Qt::ListViewItemIterator.new(lv)
=> #<Qt::ListViewItemIterator:0xb79cf620>
irb(main):007:0> it.current
=> #<Qt::ListViewItem:0xb79d3054>
irb(main):008:0> it += 1
=> #<Qt::ListViewItemIterator:0xb79cf620>
irb(main):009:0> it.current
=> #<Qt::ListViewItem:0xb79dbe70>
irb(main):010:0> it += 1
=> #<Qt::ListViewItemIterator:0xb79cf620>
irb(main):011:0> it.current
=> #<Qt::ListViewItem:0xb79d8180>
irb(main):012:0> it += 1
=> #<Qt::ListViewItemIterator:0xb79cf620>
irb(main):013:0> it.current
=> nil


-- Richard