The document provides an overview of using Ruby for creating desktop applications, highlighting the versatility of Ruby beyond web development. It focuses on using JRuby, a Ruby implementation on the Java Virtual Machine, to develop GUI applications with various tools and libraries. The document includes practical examples and insights into event handling and component management within a Ruby-based UI framework.

1. Desktop Application with Ruby
Getting started with

2. I am...
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KOHANA JSE JEE
Ruby GWT JavaScript
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BackboneJS CSS3
HTML5 MySQL Drupal
Anis Uddin Ahmad MongoDB PHPUNIT Groovy
CTO & Co-Founder JRuby Symfony2 SWING
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sqlite Doctrain solr Phing grails ...

3. !=

4. Ruby is not ONLY for web

5. It's a generic purpose language

6. generic purpose?
●
Web Application
●
Desktop Application
●
Mobile Application (Yes iPhone too!)
●
DSLs
●
Antyhing you can think*

7. So, Ruby can make Desktop App?
Okay...
But HOW?

8. Many Ways!
Shoes Ruby-GNOME2 / GTK
WxRuby Ruby-Tk
Ruby Cocoa / MacRuby
QtRuby JRuby + Swing
FxRuby JRuby + SWT

9. Many Ways!
Shoes Ruby-GNOME2 / GTK
WxRuby Ruby-Tk
Ruby Cocoa / MacRuby
QtRuby JRuby + Swing
FxRuby JRuby + SWT

10. Shoes
cross-platform toolkit for
writing graphical apps easily
and artfully using Ruby

11. Starting with Shoes
●
Download (http://shoesrb.com/downloads))
●
Run Shoes

12. Starting with Shoes
●
Download (http://shoesrb.com/downloads))
●
Run Shoes

13. Shoes example
Shoes.app :width => 300, :height => 200 do
button("Click me!") { alert("Good job.") }
end

14. Shoes example
Shoes.app :width => 300, :height => 200 do
button("Click me!") { alert("Good job.") }
end

15. Shoes example (Clock)
Shoes.app do
@time = title "0:00"
every 1 do
@time.replace(Time.now.strftime("%I:%M %p"))
end
end

16. Hackety Hack!
http://hackety.com/

17. Packaging Shoes

18. JRuby
The Ruby Programming Language on the JVM

19. Ruby for desktop application? Yes we can!

20. The Redcar Editor
http://redcareditor.com/

21. Why JRuby?
●
High performance

22. Why JRuby?
●
High performance
●
Real threading

23. Why JRuby?
●
High performance
●
Real threading
●
Vast array of libraries (gems + JARs)

24. Why JRuby?
●
High performance
●
Real threading
●
Vast array of libraries (gems + JARs)
●
Platform Independent

25. Why JRuby?
●
High performance
●
Real threading
●
Vast array of libraries (gems + JARs)
●
Platform Independent
●
Enterprise Acceptance

26. Why JRuby?
●
High performance
●
Real threading
●
Vast array of libraries (gems + JARs)
●
Platform Independent
●
Enterprise Acceptance
The best of both worlds!

27. Let's make with JRuby!

28. Get JRuby
●
Download
●
Extract
●
Add bin subdirectory to your $PATH
– (PATH=path/to/jruby/bin:$PATH)
●
Test it: jruby -v
●
Assuming you have jdk 1.7 installed
●
Can be installed with rvm too

29. Import Java Swing in .rb
include Java
import javax.swing.JFrame
import javax.swing.JComboBox
import javax.swing.JButton
import javax.swing.JPanel
import javax.swing.JLabel
import javax.swing.JTextField
import java.awt.GridLayout

30. Make a Frame (JFrame)
class NumberConverter < JFrame
def initialize
super('Number Format Converter')
set_size(400,140);
set_visible(true);
set_default_close_operation(JFrame::EXIT_ON_CLOSE);
end
end
num_converter = NumberConverter.new

31. Let's run it!
$ cd go/to/source/dir
$ jruby number_converter.rb

32. Place container
super('Number Format Converter')
main = JPanel.new;
get_content_pane().add("Center", main);

33. Set Layout
super('Number Format Converter')
main = JPanel.new;
main.set_layout(GridLayout.new(3,3,2,2))
get_content_pane().add("Center", main)

34. Add Components
main.set_layout(GridLayout.new(3,3,2,2))
main.add(JLabel.new("Convert From : ", JLabel::RIGHT))
main.add(@cmbFrom = JComboBox.new)
main.add(@input = JTextField.new(15))

35. Where are they going?
main.set_layout(GridLayout.new(3,3,2,2))
main.add(JLabel.new("Convert From : ", JLabel::RIGHT))
main.add(@cmbFrom = JComboBox.new)
main.add(@input = JTextField.new(15))
1 2 3
4 5 6
7 8 9

36. Add the rest of
main.add(@input = JTextField.new(15))
# Second row
main.add(JLabel.new("Convert To : ", JLabel::RIGHT));
main.add(@cmbTo = JComboBox.new);
main.add(result = JTextField.new(15));
# Third row
main.add(JLabel.new(" ")); # Leave this cell blank
main.add(btn = JButton.new("CONVERT"));

37. Let's run again!
$ cd go/to/source/dir
$ jruby number_converter.rb

38. More with components
main.add(result = JTextField.new(15));
result.set_editable(false);
main.add(btn = Jbutton.new("CONVERT"));
# Add options to comboBoxes
num_formats = ["Decimal", "Binary", "HexaDecimal", "Octal"]
num_formats.each{|format| @cmbFrom.add_item format }
num_formats.each{|format| @cmbTo.add_item format }

39. Set Event Handler
main.add(btn = Jbutton.new("CONVERT"));
btn.add_action_listener do |evt|
result.set_text(convert.upcase);
end

40. Set Event Handler cont.
main.add(btn = Jbutton.new("CONVERT"));
btn.add_action_listener do |evt|
result.set_text(convert.upcase);
end
def convert
# Take the value of @input
# Take formats form @cmbFrom and @cmbTo
# Convert to required format
end
end # end of class NumFormat

41. Yep! It's Done!!
https://github.com/ajaxray/jruby-swing

43. Java <=> JRuby Transformation

44. Java <=> JRuby Transformation
new Car(color, wheels)
Car.new color, wheels

45. Java <=> JRuby Transformation
JLabel.LEFT
JLabel::LEFT

46. Java <=> JRuby Transformation
Obj.longFuncName();
Obj.long_func_name

47. Java <=> JRuby Transformation
String[] options = {"all", "any"};
combo = new JcomboBox(options);
options.each{ |format|
combo.add_item format
}

48. Java <=> JRuby Transformation
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
doSomething();
}
});
btn.add_action_listener do |evt|
do_something
end

49. Deployment
Warbler
http://rawr.rubyforge.org/ https://github.com/jruby/warbler

50. BTW, JRuby is not ONLY for Desktop
●
It's just Ruby*
●
Rails just works
*Here are differences- https://github.com/jruby/jruby/wiki/DifferencesBetweenMriAndJruby

51. JRuby Frameworks
https://github.com/jruby/jruby/wiki/GUIFrameworks
●
Cheri::Swing
●
Limelight
●
Monkeybars
●
RSwing
●
Rubeus
●
Swiby

52. JRuby Frameworks
https://github.com/jruby/jruby/wiki/GUIFrameworks
●
Cheri::Swing
●
Limelight
●
Monkeybars
●
RSwing
●
Rubeus
●
Swiby
Frame.new("hello, world") do |frame|
frame.default_close_operation = :exit_on_close
frame.size = [200, 200]
...

53. Questions?