[Qt-jambi-interest] [Resolved] RE: Subclassing QLayout & QNoNativeResourcesException

[Helge Fredriksen]

Dear Frank,

Very interesting that you are working on porting Qwt using Qt Jambi!
Are you using the Qt Jambi generator to achieve this? Would it be
possible for you to share this work with the community? It would really
be a great enhancement for the project.

Another great component to have available for Qt Jambi is Marble, which
I'm quite eager to get going with (once I have time, which is something
of a sparse resource these days).

Regards,
Helge Fredriksen

Frank Bergmann wrote:
> Thank you so much for the example. I'm actually working on a port of Qwt for
> C#. And I felt bad posting C# code to what essentially is a java list.
> Anyway, I just ported over your example and it works just fine, so at least
> I now know that the problem is not the subclassing of the layout. After
> seeing your example I added a new method to my layout: 
>
> public void addWidget(QWidget widget, int magic)
>         {
>             addChildWidget(widget);
>             addItem(new QWidgetItem(widget));
>         }
>
> And this magically resolved all my issues. I still think it should not have
> been necessary though. 
>
> Anyway ... thanks again 
>
> Frank
>
>   
>> -----Original Message-----
>> From: qt-jambi-interest-bounces at trolltech.com [mailto:qt-jambi-interest-
>> bounces at trolltech.com] On Behalf Of Lists
>> Sent: Thursday, December 10, 2009 4:54 AM
>> To: qt-jambi-interest at trolltech.com
>> Subject: Re: [Qt-jambi-interest] Subclassing QLayout &
>> QNoNativeResourcesException
>>
>> Hi!
>>
>> It's hard to find an error without posting your code :)
>>
>>
>> Attached you can find a BorderLayout implementation.
>>
>> It's part of the QT implementation from the JVx Enterprise Application
>> Framework.
>>
>> It's still in development, but it's open source (Apache 2.0 licence) and
>> maybe the class will help you as template?
>>
>> The referenced classes are not included, but i think that's not a problem
>>     
> for
>   
>> you.
>>
>>
>>     
>>> -----Ursprüngliche Nachricht-----
>>> Von: qt-jambi-interest-bounces at trolltech.com
>>> [mailto:qt-jambi-interest- bounces at trolltech.com] Im Auftrag von Frank
>>> Bergmann
>>> Gesendet: Donnerstag, 10. Dezember 2009 01:28
>>> An: qt-jambi-interest at trolltech.com
>>> Betreff: [Qt-jambi-interest] Subclassing QLayout &
>>> QNoNativeResourcesException
>>>
>>> Hello,
>>>
>>> I had to implement a custom Layout but somehow things just don't work
>>> as planned, directly after adding an item to the layout, like so:
>>>
>>> contentsWidget.layout().addWidget(legendItem);
>>>
>>> and verifying by debugging addItem(QLayoutItemInterface item), that
>>> everything is fine on my end (I even made sure that itemAt(index)
>>> within my Layout class would return the right thing). However as soon
>>> as the addWidget call completes, I'm in trouble:
>>>
>>> contentsWidget.layout().itemAt(0).widget()
>>>
>>> returns with a com.trolltech.qt.QNoNativeResourcesException. (And that
>>> even though my legendItem is still just fine.) The message that I get
>>> is:
>>>
>>> "Function call on incomplete object of type:
>>> com.trolltech.qt.gui.QLayoutItem$ConcreteWrapper"
>>>
>>> Which is not at all helpful. As final straw I turned to the
>>> documentation:
>>>
>>> http://qt.nokia.com/doc/qtjambi-4.5.2_01/index.html
>>>
>>> which hints at implementations of a BorderLayout and FlowLayout
>>> example, however
>>>
>>> http://qt.nokia.com/doc/qtjambi-4.5.2_01/com/trolltech/qt/layouts-
>>> borderlayo
>>> ut.html
>>> http://qt.nokia.com/doc/qtjambi-4.5.2_01/com/trolltech/qt/layouts-
>>> flowlayout
>>> .html
>>>
>>> both are not very informative. I hope I can find some clues here,
>>>
>>> cheers
>>> Frank
>>>
>>> _______________________________________________
>>> Qt-jambi-interest mailing list
>>> Qt-jambi-interest at trolltech.com
>>> http://lists.trolltech.com/mailman/listinfo/qt-jambi-interest
>>>       
>
>
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