form.rb

class Form < Qt::Widget
  # Define slots of our class. Parenthesis are REQUIRED.
  slots 'showMessage()'

  def initialize(parent = nil)
    # Call the parent class constructor and pass the arguments to
    # it (equivalent to super(parent) call).
    super
    @ui = Ui_Form.new
    # Create our layout on this window.
    @ui.setupUi(self)
    # Connect 'clicked()' signal of push button with the
    # 'showMessage()' slot in this window.
    Qt::Object.connect(@ui.pushButton,
                       SIGNAL('clicked()'),
                       self,
                       SLOT('showMessage()'))
  end

  def showMessage
    # Get the text from line edit widget.
    text = @ui.lineEdit.text
    # Show it in message box.
    Qt::MessageBox::information(self, 'Tutorial', text)
  end
end