TreeWidgetItem problem

Ruby
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:

@rootItem = Qt::TreeWidgetItem.new(@tree)
unresolved constructor call Qt::TreeWidgetItem (ArgumentError)

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 C. ha escrit:

self.setCentralWidget(@tree)
tells me:

It seems that you need to specify also the optional parameter. If you

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

Alle giovedì 17 maggio 2007, Miquel ha scritto:

self.setCentralWidget(@tree)
tells me:

substitute the line
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

5

On May 17, 11:01 am, Stefano C. [email protected] wrote:

The first one is used in the @rootNode object creation and the second
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’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

6

En/na Stefano C. ha escrit:

item.setText(0, "Node#{index}")

QTreeWidgetItem ( QTreeWidgetItem * parent, int type = Type )

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