richard.j.dale@gmail.com
11/20/2006 6:23:00 PM
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(:'++')
That will nearly work, but the method is a C++ method in the Smoke
library, and so it is called 'operator++':
mardigras rdale 504% rbqt3api Qt::ListViewItemIterator |grep operator
QListViewItem* QListViewItemIterator::operator*()
QListViewItemIterator& QListViewItemIterator::operator++()
const QListViewItemIterator
QListViewItemIterator::operator++(int)
QListViewItemIterator& QListViewItemIterator::operator+=(int)
QListViewItemIterator& QListViewItemIterator::operator--()
const QListViewItemIterator
QListViewItemIterator::operator--(int)
QListViewItemIterator& QListViewItemIterator::operator-=(int)
QListViewItemIterator& QListViewItemIterator::operator=(const
QListViewItemI
Instead you need to do something like this:
p it.send("operator++".to_sym)
I've just added some each methods to various Qt3 QtRuby classes, and
made them enumerable, so you no longer need to use an external C++
style iterator with them. This is the comment from the ChangeLog:
* Made Qt::ListView, Qt::ListViewItem, Qt::BoxLayout, Qt::HBoxLayout,
Qt::VBoxLayout and Qt::GridLayout Enumerable with implementations
of each() so they don't need to use the Qt External iterators like
Qt::LayoutIterator anymore. For instance:
lv = Qt::ListView.new do
["one", "two", "three", "four"].each do |label|
Qt::ListViewItem.new(self, label, "zzz")
end
end
lv.each do |item|
p item.inspect
pp item.inspect
end
* Add inspect() and pretty_print() methods to Qt::ListViewItem so that
they show the text of their columns
The improvements will be in the next release of Qt3 QtRuby.
-- Richard