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Download Rapid GUI Development with QtRuby by Tennis C. PDF

By Tennis C.

See how one can use the robust Qt3 library to create cross-platform GUI purposes for Linux and OS X in Ruby. Covers install, simple and complex programming, occasion versions, and Korundum.

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Extra info for Rapid GUI Development with QtRuby

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6 Summary • All QtRuby widgets inherit from the base class Qt::Widget. This in turn inherits from Qt::Object. • All QtRuby widgets fit into an overall family tree structure. Child widgets are contained within the physical geometry of the parent. Destruction of a widget causes all of its descendants to be destroyed as well. • Every QtRuby program needs one and only one Qt::Application instance. It must be created before any GUI widgets are initialized. • The application event loop starts with a call to Qt::Application’s exec( ) method.

To_s + " times" ) F ridays BOOKLEET © Report erratum 55 C HAPTER 5. T AKE THE P LUNGE S IGNALS tripped_times_signal(int) AND S LOTS 56 emit timer_tripped_slot timeo u t() ) ext( setT @label The Timer... 15: Custom Widget with Signals and Slots emit tripped_times_signal(@tripped_times) end end In this example, we create a Qt::Timer that gets activated every second Qt::Timer is a very convenient class for repeatedly calling a slot at a certain frequency. In most cases, a Qt::Timer can be accurate to 1 millisecond.

In Qt programs, slots get connected to signals in order to automate tasks. 5, Signals and Slots, on the following page for more details. gram to see just how easy using them really is. In order to take advantage of the automation, we need to define exactly what is a signal and what is a slot. Since our @button widget is a built in Qt::PushButton, its clicked( ) signal is already defined for us. However, the slot we will be connecting it to, button_was_clicked( ) has not been defined as a slot. A simple line in our MyWidget class handles that for us: slots 'button_was_clicked()' And last, in the MyWidget initializer, we need to connect the signal and slot together: connect(@button, SIGNAL('clicked()' ), self, SLOT('button_was_clicked()' )) When put all together, our final program looks like this: require 'Qt' class MyWidget < Qt::Widget slots 'button_was_clicked()' def initialize(parent=nil) F ridays BOOKLEET © Report erratum 46 C HAPTER 5.

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