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Ruby Desktop Apps with Qt
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ynonperek
June 25, 2012
Technology
1
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Ruby Desktop Apps with Qt
Writing desktop applications using ruby and Qt
ynonperek
June 25, 2012
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Transcript
Back To The Desktop Ynon Perek http://qtcollege.co.il Monday, June 25,
12
WHY ? Monday, June 25, 12
Desktop Apps • Office • Web Browser • Skype •
IDE • Torrent / FTP Client Monday, June 25, 12
So You Want To Write A Ruby Desktop App ...
Monday, June 25, 12
Mature and Widely Used • Choosing a widely used framework
ensures that you won’t run into bumps when scaling up • Choosing a framework with future ensures it won’t suddenly disappear Monday, June 25, 12
Cross Platform • The more the better • Code once,
look good everywhere Monday, June 25, 12
Cross Platform Monday, June 25, 12
Cross Language • C++ • Java • Ruby • Perl
• Python Monday, June 25, 12
Good UI Designer Monday, June 25, 12
Choose Qt • Cross Platform • Cross Languages • Awesome
Tools • Here To Stay Monday, June 25, 12
Famous Qt Apps • Skype • Google Earth • KDE
• KOffice • VLC • PhantomJS Monday, June 25, 12
QtRuby In Action • Installation • UI Design • Add
Actions • Use Stock Dialogs • Code: http://github.com/ynonp/ ruby-underground-talk Monday, June 25, 12
Installation: Windows gem install qtbindings Monday, June 25, 12
Installation: Mac/Linux • Install Qt SDK from Nokia • gem
install qtbindings • Details: https://github.com/ryanmelt/ qtbindings Monday, June 25, 12
Hello QtRuby 1 require 'Qt' 2 3 app = Qt::Application.new
( ARGV ) 4 5 b = Qt::PushButton.new( "DIE ALL HUMANS" ) 6 b.connect ( SIGNAL :clicked ) { app.exit } 7 8 b.show 9 app.exec 10 Monday, June 25, 12
Signals & Slots • Signals are Semantic Events • Slots
are handlers (methods or blocks) • signal -----> slot Monday, June 25, 12
Object Trees • Each Qt::Widget may contain other widgets •
Pass a container (parent) to initialize • Use layouts to determine ordering Monday, June 25, 12
No Layout 1 require 'Qt' 2 3 app = Qt::Application.new
( ARGV ) 4 5 w = Qt::Widget.new 6 b = Qt::PushButton.new( "Ouch! That hurt" , w) 7 c = Qt::PushButton.new("9", w) 8 9 w.show 10 11 app.exec 12 Monday, June 25, 12
With Layout 1 require 'Qt' 2 3 app = Qt::Application.new
( ARGV ) 4 5 w = Qt::Widget.new 6 7 b = Qt::PushButton.new( "Ouch! That hurt") 8 c = Qt::PushButton.new("9") 9 10 l = Qt::VBoxLayout.new( w ) 11 l.addWidget ( b ) 12 l.addWidget ( c ) 13 14 w.show 15 16 app.exec 17 Monday, June 25, 12
Monday, June 25, 12
UI Design • Run Qt Designer • Make GUI •
Save as .ui file • Convert to ruby with: rbuic4 file.ui -x -o file_ui.rb Monday, June 25, 12
Nested Layouts Combine different layout managers to make the layout
on the right Monday, June 25, 12
Add Actions • Connect actions with • obj.connect ( SIGNAL
:sig ) { action } Monday, June 25, 12
Use Stock Dialogs • Qt::MessageBox.about • Qt::FileDialog.get_open_file_name • Qt::FileDialog.get_save_file_name Monday,
June 25, 12
QtRuby First App • Rapid UI with Designer • Easy
layouts with Qt’s Layout Managers • Extensive library of Widgets and Stock Dialogs Monday, June 25, 12
Add Some Color • Use css-like style sheets to style
your app • Syntax: http://qt-project.org/ doc/qt-4.8/stylesheet- syntax.html Monday, June 25, 12
Happy Coding ! • Ynon Perek • http://qtcollege.co.il •
[email protected]
Monday, June 25, 12