[Kde-bindings] Re: custom qt derived c++ class example for qtruby

[Alex]

On Wed, Dec 22, 2010 at 11:23 AM, Arno Rehn <arno at arnorehn.de> wrote:
> On Wednesday 22 December 2010 18:06:36 Alex wrote:
>> On Wed, Dec 22, 2010 at 4:28 AM, Arno Rehn <arno at arnorehn.de> wrote:
>> > On Wednesday 22 December 2010 04:14:49 Vincent Batts wrote:
>> >> from the kdebindings/ruby/qtruby/examples/ check out
>> >> ./examples/dialogs/simplewizard/classwizard.rb
>> >> ./examples/mainwindows/mdi/mainwindow.rb
>> >> they both use QWidget
>> >>
>> >> as for QGraphicsItem, i don't think it is available in qtruby yet.
>> >
>> > Of course it's available. QtRuby supports nearly all Qt classes.
>> > I think Alex' question was a different one anyway.
>>
>> Yeah, I have used QGraphicsItem on the ruby side, for prototyping, but
>> the ruby side isn't fast enough to do what I want to do so I want to
>> use c++ for this custom item.
>>
>> >> On Tue, Dec 21, 2010 at 9:55 PM, Alex <x37v.alex at gmail.com> wrote:
>> >> > Does anyone have a simple example project where you wrap a qt derived
>> >> > class, QWidget or QGraphicsItem, .. and use it on the ruby side with
>> >> > qtruby?
>> >> >
>> >> > I figure there are a few steps, the smoke wrapping, probably some code
>> >> > or tool to do the ruby wrapping, and compiling... but, it is kind of
>> >> > unclear to me how people actually do it.
>> >> >
>> >> > I have seen a lot of talk of it being possible but I haven't seen any
>> >> > actual examples which do it, I figure that would be very useful for a
>> >> > number of other folks as well.
>> >
>> > If you only have one or two classes to expose, the following might be
>> > much easier:
>> > http://pcapriotti.wordpress.com/2010/12/06/effective-qt-in-ruby-part-3-2/
>> >
>> > But if you instead want to wrap a whole library, the Smoke approach is
>> > much better. Docs on how to create a Smoke library can be found here:
>> > http://techbase.kde.org/Development/Languages/Smoke
>>
>> My understanding is that he is creating just one instance of his
>> object and using it as a single 'effect' processor.  I'm looking to
>> have an entire class wrapped so i can instantiate it multiple times
>> and use it in various places in my GUI.
> You could also create a slot like this:
>
> QGraphicsItem* Extensions::createMyGraphicsItem()
> {
>        return new MyQGraphicsItem();
> }
>
> where MyQGraphicsItem could be defined like:
>
> class MyQGraphicsItem : public QGraphicsItem
> {
> public slots:
>        void myNewFancyMethod();
> };
>
> etc. There's nothing stopping you from returning actual objects from your
> extension slot.

Ahh, very cool, Hadn't thought of that!

>
>> > Looking at existing ones isn't a bad idea either :)
>>
>> Yeah, thats basically what I'm looking for, a simple example of doing this.
>>
>> > You still need to create a ruby extension to tell QtRuby to actually load
>> > that additional Smoke library. That's fairly easy, just look at some of
>> > the simple extensions in the QtRuby source (Phonon for example). If you
>> > have more questions, don't hesitate to ask! :)
>>
>> I don't seem to see phonon in the qt ruby source.  I'm using the gem
>> 'qtbindings' but referencing the source qt4-qtruby-2.1.0 to try to
>> find examples.  I don't even see a download for phonon on the phonon
>> page..
> QtRuby is also released as part of kdebindings. Download the latest tarball
> and take a look at the Ruby bindings in there. There are quite a bunch of
> them, many of which are as simple as what you want to do. I still think for
> only one class it's not worth the effort.

Ahh, cool, finding the actual download is quite confusing, when i
search for kdebindings i find qt4-qtruby, korundum, etc.. but nothing
called 'kdebindings', where is that download?

Yeah, well, this is just the first of what may end up being quite a
few custom graphics items and widgets.

-Alex

>
> --
> Arno Rehn
> arno at arnorehn.de
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