Development/Tutorials/Qt4 Ruby Tutorial/Chapter 05

Development/Tutorials/Qt4 Ruby Tutorial/Chapter 05

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Building Blocks

Tutorial Series	Qt4 Ruby Tutorial
Previous	Tutorial 4 -Calling it Quits
What's Next	Tutorial 6 - Let There Be Widgets
Further Reading	n/a

Building Blocks

Files:

• t5.rb

Overview

This example shows how to create and connect together several widgets by using signals and slots, and how to handle resizes.

require 'Qt4'

class MyWidget < Qt::Widget

 def initialize()
   super()
   quit = Qt::PushButton.new('Quit')
   quit.setFont(Qt::Font.new('Times', 18, Qt::Font::Bold))
   
   lcd = Qt::LCDNumber.new(2)

   slider = Qt::Slider.new(Qt::Horizontal)
   slider.setRange(0, 99)
   slider.setValue(0)

   connect(quit, SIGNAL('clicked()'), $qApp, SLOT('quit()'))
   connect(slider, SIGNAL('valueChanged(int)'), lcd, SLOT('display(int)'))

   layout = Qt::VBoxLayout.new()
   layout.addWidget(quit)
   layout.addWidget(lcd)
   layout.addWidget(slider)
   setLayout(layout)
 end

end

app = Qt::Application.new(ARGV)

widget = MyWidget.new()

widget.show() app.exec()