Rapid GUI Development with QtRuby by Tennis C.

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, easy and complicated programming, occasion versions, and Korundum.

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The slot also emits the tripped_times_signal( ), telling how many times the timer has tripped. The MyTimer does not make use of the tripped_times_signal( ) signal, but an external class might use that information by connecting the signal to one of its slots. 15 . F ridays BOOKLEET © Report erratum C HAPTER 5. 6 Slot Senders Sometimes during a slot it is useful to know how the slot got started. The sender( ) returns the Qt::Object which was responsible for the slot call. The sender( ) method only works for a slot when it was activated by a signal—manually calling the slot does not work.

Child_3 would also be destroyed, since its parent, child_1, was destroyed. Why parents and children? You may be wondering the logic behind having to specify a parent when creating a new instance of a widget. It turns out that this The parent/child model allows us to create objects and then methodology fits the GUI model very well. not worry about their ownership. After creation, QtRuby The common convention is to have one top level widget for the appli- handles all of the details for us. cation of which all the other widgets are children or grandchildren (or great grandchildren.

8, on the next page we show two different ways of sizing widgets within the same layout. On the left side, we set the vertical Qt::SizePolicy of each of the contents to MinimumExpanding, which equalizes the spacing of all of the widgets. On the right, we set the Qt::SizePolicy of the two widgets to Preferred, which only takes up the amount of space the widget internally calculates that it needs. The spacer at the top has a Qt::SizePolicy of Expanding, which allows it to take up the rest of the space available in the layout.

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