124 | Chapter 3: Singleton Pattern
open the Convert to Symbol dialog box. TypeCartas the Name, and select
Movie clip as the Type. Click the Export for ActionScript checkbox, and click
OK. (See Figure 3-7 for a visual idea of the cart.)- Double-click the Shopping Cart movie clip on the stage to open it for editing. Use
the Text tool to add a Dynamic text field. Give it the instance nametotal_txtin
the Properties panel. - Exit the Symbol Editing Mode by clicking on the Scene 1 icon. Delete the movie
clip from the stage. (Don’t worry; it’ll still be in the Library panel.) - Test the application by pressing Ctrl + Enter (Command + Return on the Mac.)
When the application runs, it creates a singleShopCartclass instance, and, using the
kaChing( )method, it adds a total of $10.06 to the text field in the shopping cart
movie clip as shown in Figure 3-7.
Figure 3-7. Correct results with two references to a single instance