I'm new in Qt. I create main and dialog windows in Qt4 Designer. I want
to place dialog window in the middle of main window, and place main
window in the center of screen. Is it possible?

>>code:
require 'Qt4'
require 'mainwindow.rb'
require 'logindialog.rb'

class MW < Qt::MainWindow
  slots 'setfocus()'
  def initialize parent=nil
    super
    @ui = Ui_MW.new
    @ui.setupUi self
...
  end
end

class LoginDL < Qt::Dialog
  slots 'enter_click()'
  def initialize parent=nil
    super
    @ui = Ui_LoginDL.new
    @ui.setupUi self
...
  end
...
end

if $0 == __FILE__
    app = Qt::Application.new(ARGV)
    $mainw = MW.new
    $mainw.show

    loginw=LoginDL.new
    loginw.show
    app.exec
end
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