A brief introduction and example of developing desktop application with Ruby programming language. JRuby and shoesrb is discussed as platform. Prepared for and Presented on Ruby Conference Bangladesh 2003.

1. Desktop Application with Ruby
Getting started with

2. I am...
PHP ZEND
KOHANA JSE JEE
Ruby GWT JavaScript
jQuery sinatra
BackboneJS CSS3
HTML5 MySQL Drupal
Anis Uddin Ahmad MongoDB PHPUNIT Groovy
CTO & Co-Founder JRuby Symfony2 SWING
WNeeds Ltd.
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?