From: Miquel Oliete <ktalanet@...>
Date: 2007-05-17T20:06:41+09:00
Subject: Re: TreeWidgetItem problem

En/na Stefano Crocco ha escrit:
> Alle gioved� 17 maggio 2007, Miquel ha scritto:
>   
>> En/na Stefano Crocco ha escrit:
>>     
>>> Alle gioved� 17 maggio 2007, Miquel ha scritto:
>>>       
>>>> Hi there
>>>>
>>>> I'm trying to code a Tree using ruby qt bindings (Qt v4.2.0 using
>>>> aboutQt() info).
>>>>
>>>> This is my code.
>>>>
>>>> 	@tree = Qt::TreeWidget.new(self)
>>>> 	self.setCentralWidget(@tree)
>>>>
>>>> 	@rootItem = Qt::TreeWidgetItem.new(@tree)
>>>> 	@rootItem.setText(0, "Root")
>>>>
>>>> 	0.upto(10) do |index|
>>>> 		item = Qt::TreeWidgetItem.new(@rootItem)
>>>> 		item.setText(0, "Node#{index}")
>>>> 	end
>>>>
>>>> The problem is in 'item = Qt::TreeWidgetItem.new(@rootItem)', system
>>>> tells me:
>>>>
>>>> unresolved constructor call Qt::TreeWidgetItem (ArgumentError)
>>>>
>>>> and reading Qt documentation there are two constructors allowed:
>>>>
>>>> QTreeWidgetItem ( QTreeWidget * parent, int type = Type )
>>>> QTreeWidgetItem ( QTreeWidgetItem * parent, int type = Type )
>>>>
>>>> The first one is used in the @rootNode object creation and the second
>>>> one is the one which produces this message.
>>>>
>>>> Can anybody help me?
>>>>
>>>> Thanks in advance
>>>>
>>>> Best regards
>>>>
>>>>
>>>> 	Miquel
>>>>         
>>> It seems that you need to specify also the optional parameter. If you
>>> substitute the line
>>> item = Qt::TreeWidgetItem.new(@rootItem)
>>> with
>>> item = Qt::TreeWidgetItem.new(@rootItem, Qt::TreeWidgetItem::Type)
>>> it should work (at least, it does on my system, with qt 4.2.3).
>>>
>>> I hope this helps
>>>
>>> Stefano
>>>       
>> Hey, it is :-D !!!!!! but...Why isn't it necessary in the root node
>> creation (the constructor have the same optional parameter)?
>>
>> Thanks
>>
>>
>>     Miquel
>>     
>
> Looking at the Korudum forum 
> (http://rubyforge.org/forum/forum.php?forum_id=723), it seems there are some 
> situations in which QtRuby fails to correctly resolve overloaded methods. In 
> this case, the constructor which takes a Qt::ListWidget is resolved 
> correctly, the other isn't. A similar situation occurred me using 
> Qt::MessageBox.question. Although the documentation says the buttons and 
> defaultButton parameters are optional, the method call failed in ruby unless 
> they were both specified. Another example is mentioned on this thread of the 
> Korundum forum: http://rubyforge.org/forum/message.php?msg_id=15576
>
> Stefano
>
>
>
>
>   
Ok, I have reported this issue to the KDE bindings list and Richard Dale 
is asking me some questions. If you are interested in final conclusions 
I'll post here :-D

Thanks for all

Best regards

    Miquel