Essential ActionScript 2.0

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Chapter 18: The Model-View-Controller Design Pattern

An MVC Clock

With our core MVC structure in place, we can create a real-world MVC applica-

tion—a clock with analog and digital displays. The default MVC framework and

source files for the clock are available at http://moock.org/eas2/examples.

Figure 18-3 shows the graphical user interface for the clock. Notice that in addition

to the analog and digital displays, the clock includes buttons to start, stop, and reset

the clock’s time.

Our clock application includes seven classes, as follows:

Clock

The main application class, which creates the MVC clock

ClockModel

The model class, which tracks the clock’s time

ClockUpdate

An info object class that stores update data sent by ClockModel to all views

ClockAnalogView

A view class that presents the analog clock display

ClockDigitalView

A view class that presents the digital clock display

/**

* Returns this controller's view.

*/

public function getView ( ):View {

return view;

}

}

Figure 18-3. The Clock graphical user interface

Example 18-4. The AbstractController class (continued)

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