TreeWidgetItem problem

ruby-talk
1

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

2

Alle giovedì 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

3

En/na Stefano Crocco ha escrit:

Alle giovedì 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 :smiley: !!!!!! but...Why isn't it necessary in the root node creation (the constructor have the same optional parameter)?

Thanks

    Miquel

4

I've found out what the problem is, and it's already fixed in the kde
svn version of QtRuby. Here is the entry from the ChangeLog:

2006-12-16 Richard Dale <rdale@xxxx>

  * There is no way to distinguish between the two constructors:
      QTreeWidgetItem (const QTreeWidgetItem & other)
     QTreeWidgetItem (QTreeWidgetItem * parent, const QStringList &
           strings, int type = Type)
    when the latter has a single argument. So force the second variant
to
      be called

-- Richard

···

On May 17, 11:01 am, Stefano Crocco <stefano.cro...@alice.it> wrote:

Alle giovedì 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).

5

Alle giovedì 17 maggio 2007, Miquel ha scritto:

En/na Stefano Crocco ha escrit:
> Alle giovedì 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 :smiley: !!!!!! 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

6

En/na Stefano Crocco ha escrit:

Alle giovedì 17 maggio 2007, Miquel ha scritto:
  

En/na Stefano Crocco ha escrit:
    

Alle giovedì 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 :smiley: !!!!!! 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 :smiley:

Thanks for all

Best regards

    Miquel