QtRuby for Qt Developers

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Introducing QtRuby Ynon Perek http://qtcollege.co.il Monday, August 6, 12

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What is wrong with C++ Monday, August 6, 12

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Non-Virtual By Default int main(int argc, char **argv) { Foo *f = new Bar(); // Calls Foo::doSomething by default f->doSomething(); } Monday, August 6, 12

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Implicit Copy Ctor int printData( Foo f ) { } int printRef ( Foo& f ) { } int main(int argc, char **argv) { Foo f; printData( f ); printRef( f ); } Monday, August 6, 12

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Implicit Type Coercion int printData( Foo f ) { } int printRef ( Foo& f ) { } int main(int argc, char **argv) { Foo f; // Convert to Foo printData( 5 ); } Monday, August 6, 12

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Pointers float (SomeClass::*my_memfunc_ptr)(int, char *); Monday, August 6, 12

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No Reﬂection Monday, August 6, 12

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No Anonymous Functions Monday, August 6, 12

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No Anonymous Functions • Function pointers don’t count Monday, August 6, 12

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No Anonymous Functions • Function pointers don’t count • Functors don’t count Monday, August 6, 12

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C++ Alternatives • Perl • Ruby • Java • Python Monday, August 6, 12

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C++ Alternatives • Perl • Ruby • Java • Python they all got Monday, August 6, 12

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Hello Qt require 'Qt' app = Qt::Application.new( ARGV ) w = Qt::Label.new( "Hello World" ) w.set_alignment( Qt::AlignHCenter | Qt::AlignVCenter ) w.show app.exec Monday, August 6, 12

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DEMO: UI Designer Monday, August 6, 12

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Qt Terminology • Signal speciﬁes a semantic event Monday, August 6, 12

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Qt Terminology • Signals are connected to slots which are the handling code Monday, August 6, 12

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Designer Takeaways • Drag & Drop to create UI • Save as .ui ﬁle • Run: rbuic4 file.ui -x -o file_ui.rb • Use resulting .rb ﬁle but don’t modify it Monday, August 6, 12

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Qt Actions require 'Qt' require './demo1_ui.rb' a = Qt::Application.new(ARGV) u = Ui_Form.new w = Qt::Widget.new u.setupUi(w) w.show u.btn1.connect( SIGNAL :clicked ) { u.list1.add_item( "Qt FTW" ) } a.exec Monday, August 6, 12

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Qt Actions require 'Qt' app = Qt::Application.new( ARGV ) s1 = Qt::Slider.new( Qt::Horizontal ) s2 = Qt::Slider.new( Qt::Horizontal ) Qt::Object.connect( s1, SIGNAL("valueChanged(int)"), s2, SLOT( "setValue(int)") ) Qt::Object.connect( s2, SIGNAL("valueChanged(int)"), s1, SLOT( "setValue(int)") ) s1.show s2.show app.exec Monday, August 6, 12

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Qt Stock Dialogs • Qt::MessageBox.about • Qt::FileDialog.get_open_file_name • Qt::FileDialog.get_save_file_name Monday, August 6, 12

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Qt Stock Dialogs require 'Qt' require './demo1_ui.rb' a = Qt::Application.new(ARGV) u = Ui_Form.new w = Qt::Widget.new u.setupUi(w) w.show u.btn1.connect( SIGNAL :clicked ) { filename = Qt::FileDialog.get_open_file_name; u.list1.add_item( filename ) } a.exec Monday, August 6, 12

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Q & A Monday, August 6, 12

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QtRuby • Easy UI for your programs • Solid Foundations • Use existing Qt knowledge Monday, August 6, 12

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Resources • Ruby Qt/KDE Guide http://techbase.kde.org/Development/ Languages/Ruby • Qt Tutorial Videos http://qt-project.org/videos Monday, August 6, 12

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About Me • Ynon Perek • ynonperek@yahoo.com • http://qtcollege.co.il Monday, August 6, 12