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The implementation goes into myclasscpp, and the moc generates another C++ file from the header file called moc_myclasscpp The contents from the generated file can change between Qt versions and is nothing to worry about Listing 1-9 contains the part of the implementation that has changed because of signals and slots Listing 1-9 Implementing MyClass with signals and slots void MyClass::setText( const QString &text ) { if( m_text == text ) return; m_text = text; emit textChanged( m_text ); } The changes made to emit the signal textChanged can be divided into two parts The first half is to check that the text actually has changed If you do not check this before you connect the textChanged signal to the setText slot of the same object, you will end up with an infinite loop (or as the user would put it, the application will hang).

You ll see the before Policy message box appear, but that will be all The other message box won t appear This is because the rules are in an infinite loop Because both the rules within the RuleSet have their reevaluate property set to Always and the chaining is Full, each time a rule executes the other rule is reevaluated The GreaterThan0 rule, which executes first, sets the value to 0, and the Equal0 rule, which executes second, sets the value to 1 When the Equal0 rule sets the value to 1, the GreaterThan0 rule is reevaluated because of the Always Reevaluate property Open the Rule Set Editor again and change the Reevaluate property of the Equal0 rule to Never.

The second half of the change is to actually emit the signal, which is done using the Qt keyword emit followed by the signal s name and arguments..

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You attach a hoverBehavior element to this control and implement actions for <hover> and <unhover> These actions then simply call the show and hide methods of the <popupBehavior> to make it appear and disappear when hovering over and hovering off, respectively..

Signals and slots are implemented by Qt using function pointers. When calling emit with the signal as argument, you actually call the signal. The signal is a function implemented in the source file generated by the moc. This function calls any slots connected to the signal using the meta-objects of the objects holding the connected slots. The meta-objects contain function pointers to the slots, along with their names and argument types. They also contain a list of the available signals and their names and argument types. When calling connect, you ask the meta-object to add the slot to the signal s calling list. If the arguments match, the connection is made. When matching arguments, the match is checked only for the arguments accepted by the slot. This means that a slot that does not take any arguments matches all signals. The arguments not accepted by the slot are simply dropped by the signal-emitting code.

To try out the signals and slots in MyClass, the a, b, and c instances are created: QObject parent; MyClass *a, *b, *c; a = new MyClass( "foo", &parent ); b = new MyClass( "bar", &parent ); c = new MyClass( "baz", &parent ); Now connect them. To connect signals and slots, the QObject::connect method is used. The arguments are source object, SIGNAL(source signal), destination object, SLOT(destination slot). The macros SIGNAL and SLOT are required; otherwise, Qt refuses to establish the connection. The source and destination objects are pointers to QObjects or objects of classes inheriting QObject. The source signal and destination slot are the name and argument types of the signal and slot involved. The following shows how it looks in the code. Figure 1-3 shows how the object instances are connected. QObject::connect( a, SIGNAL(textChanged(const QString&)), b, SLOT(setText(const QString&)) ); QObject::connect( b, SIGNAL(textChanged(const QString&)), c, SLOT(setText(const QString&)) ); QObject::connect( c, SIGNAL(textChanged(const QString&)), b, SLOT(setText(const QString&)) );

When the rules are executed this time, the GreaterThan0 rule will set the value to 1, the Equal0 rule will set the value to 0, and the GreaterThan0 rule will be reevaluated and set the value to 1 The Equal0 rule won t be reevaluated, and won t change the value Execute the workflow to see this happen Before the Policy activity, the value is 1, and after the Policy activity, the value is 0..

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