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The changes to the code are minimal. First, the definition of the class is altered slightly, as shown in Listing 1-2. The parent argument is also added to the constructor as a convenience because QObject has a function, setParent, which can be used to assign an object instance to a parent after creation. However, it is common and recommended to pass the parent as an argument to the constructor as the first default argument to avoid having to type setParent for each instance created from the class. Listing 1-2. Inheriting QObject and accepting a parent #include <QObject> #include <string> using std::string; class MyClass : public QObject { public: MyClass( const string& text, QObject *parent = 0 ); ... };

Note To access the QObject class, the header file <QObject> has to be included. This works for most Qt classes; simply include a header file with the same name as the class, omitting the .h, and everything should work fine.

The Atlas Select control corresponds to an HTML select tag, <select>, which implements various forms of drop-down lists. You define a select tag in your page like this: <select id="Select1"> <option selected="selected">Option 1</option> <option>Option 2</option> <option>Option 3</option> </select> The select tag specifies the list, and the child option tags specify the elements. The previous snippet defines a selection list with three options, the first option being selected by default.

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You must place all three of these activities (StateInitialization, StateFinalization, and SetState) within a State activity container; you can t just place them within the workflow They re dependent on the State activity This shows that, for the most part, the State activity is a container for other activities This makes sense, because the State activity is considered the building block of the State Machine workflow, and the State Machine workflow requires State activities..

The parent argument is simply passed on to the QObject constructor like this: MyClass::MyClass( const string& text, QObject *parent ) : QObject( parent ) Let s look at the effects of the change, starting with Listing 1-3. It shows a main function using the MyClass class dynamically without Qt. Listing 1-3. Dynamic memory without Qt #include <iostream> int main( int argc, char **argv ) { MyClass *a, *b, *c; a = new MyClass( "foo" ); b = new MyClass( "ba-a-ar" ); c = new MyClass( "baz" ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; a->setText( b->text() ); std::cout << a->text() << " (" << a->getLengthOfText() << ")" << std::endl; int result = a->getLengthOfText() - c->getLengthOfText(); delete a; delete b; delete c; return result; } Each new call must be followed by a call to delete to avoid a memory leak. Although it is not a big issue when exiting from the main function (because most modern operating systems free the memory when the application exits), the destructors are not called as expected. In locations other than loop-less main functions, a leak eventually leads to a system crash when the system runs out of free memory. Compare it with Listing 1-4, which uses a parent that is automatically deleted when the main function exits. The parent is responsible for calling delete for all children and ta-da! the memory is freed.

Note In the code shown in Listing 1-4, the parent object is added to show the concept. In real life, it

You associate this CheckBox with an Atlas Select control like this: var g_sel = new Sys.UI.Select($('Select1')); The Select control exposes the methods described in Table 4-25. Table 4-25. Select Control Methods

would be an object performing some sort of task for example, a QApplication object, or (in the case of a dialog box or a window) the this pointer of the window class.

Create a new VB State Machine Workflow Console Application called VBStateActivitiesConsoleApplication In previous chapters you set the default state the one that was already created when the workflow was created as the completed state Instead, this time drag and drop a StateInitialization activity from the toolbar onto the default State activity Remember, you must house the StateInitialization, StateFinalization, and SetState activities inside a State activity Click the State activity and open the properties Set the name to be State1 While on the Properties page, click the SetToInitialState link This makes the State1 activity the first activity to be fired when the workflow is entered Every State Machine workflow must have an initial state Next, click the StateInitialization activity within the State1 activity (called stateInitializationActivity1) and click the properties page Change the name to Initialization1 Double-click the Initialization1 activity.

item via code as well as when the user picks an item. The activated signal is emitted only when the user changes the current item.

addCSSClass(String className)

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