From: Arturo Bonechi <arturo.bonechi@...>
Date: 2010-09-05T19:51:10+09:00
Subject: "Segmentation fault" with QtRuby

Hello everyone!

Using QtRuby, I tried to implement the "Read-only example model"
(Creating new models chapter) of the "Model/View programming" technology
section of Qt Assistant.

But when I launch the example, I got this error :
main.rb:5: [BUG] Segmentation fault
ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]

Abandon

Here is the code :
# slmodel.rb
class SLModel < Qt::AbstractListModel
  def initialize string_list, parent = nil
    super parent

    @string_list = string_list
  end

  def rowCount parent = Qt::ModelIndex.new
    @string_list.length
  end

  def data index, role
    return Qt::Variant.new unless index.isValid
    return Qt::Variant.new if index.row >= @string_list.length

    return @string_list[index.row] if role == Qt.DisplayRole

    Qt::Variant.new
  end

#  def headerData section, orientation, role = Qt.DisplayRole
#    return Qt::Variant.new if role != Qt.DisplayRole
#
#    if orientation == Qt.Horizontal
#      "Column #{section}"
#    else
#      "Row #{section}"
#    end
#  end
end

# window.rb
require 'slmodel'

class Window < Qt::Widget
  def initialize parent = nil
    super parent

    @list = %w[Alpha Beta Gamma Omega]
    @model = SLModel.new @list, self
    @view = Qt::ListView.new

    @view.setModel @model

    layout = Qt::VBoxLayout.new
    layout.addWidget @view

    setLayout layout
  end
end

# main.rb
require 'Qt4'
require 'window'

a = Qt::Application.new ARGV
window = Window.new
window.show
a.exec

As the error message doesn't give me that much explanations, I don't
know what is the origin of the problem...
Is it because I forgot to implement some virtual methods from
Qt::AbstractListModel?

Thanks!
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