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The first examples you saw in this chapter introduced you to the concepts of bindings and actions You were able to take these to the next level using these examples First, you were introduced to the concepts of directional binding Traditionally you would see a binding as a control being associated with data from a data source, so if the data in the source changes, the control would be updated This is considered an In binding With Atlas you can also have Out binding, where the destination control updates the source control, and InOut binding, where the data binding is bidirectional You saw this in the first example where by checking a checkbox, you could update a text field with text indicating its state and by typing into the text box you could also change the state of the checkbox This in turn introduced the concepts of transforming during binding.

Two of the biggest strengths that Qt brings to C++ are signals and slots, which are very flexible ways to interconnect objects and help to make code easy to design and reuse. A signal is a method that is emitted rather than executed when called. So from your viewpoint as a programmer, you declare prototypes of signals that might be emitted. Do not implement signals; just declare them in the class declaration in the signals section of your class. A slot is a member function that can be invoked as a result of signal emission. You have to tell the compiler which methods to treat as slots by putting them in one of these sections: public slots, protected slots, or private slots. The protection level protects the slot only when it is being used as a method. You can still connect a private slot or a protected slot to a signal that you receive from another class. When it comes to connecting signals and slots, you can connect any number of signals to any number of slots. This means that a single slot can be connected to many signals, and a single signal can be connected to many slots. There are no limitations to how you interconnect your objects. When a signal is emitted, all slots connected to it are called. The order of the calls is undefined, but they do get called. Let s look at some code that shows a class declaring both a signal and a slot (see Listing 1-8).

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Listing 1-8. A class with a signal and a slot #include <QString> #include <QObject> class MyClass : public QObject { Q_OBJECT public: MyClass( const QString &text, QObject *parent = 0 ); const QString& text() const; int getLengthOfText() const; public slots: void setText( const QString &text ); signals: void textChanged( const QString& ); private: QString m_text; }; The code is a new incarnation of the class MyClass you have been working with throughout the chapter. There are changes related to the signals and slots in the three emphasized areas of the listing. Start from the bottom with the new section labeled signals:. This tells you that the functions declared in this section will not be implemented by you; they are simply prototypes for the signals that this class can emit. This class has one signal: textChanged. Moving upward, there is another new section: public slots:. Slots can be public, protected, or private like any other member just add the appropriate protection level before the slots keyword. Slots can be considered a member function that can be connected to a signal. There is really no other difference; it is declared and implemented just like any other member function of the class.

Figure 5-7. GreaterThan0 property with the Condition property expanded Follow the same steps to add a condition to the LessThanEqual0 branch. Use this.IntValue <=0 as the condition. After you add the condition in the Rule Condition Editor, you ll notice there are now two conditions within the Select Condition box. Figure 5-8 shows the two conditions, and the Condition Preview shows the code for the LessThanEqual0 condition.

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