| Interface | Description | 
|---|---|
| ScreenView | An interface for a screen view that handles key presses and timers. | 
| Class | Description | 
|---|---|
| AbstractScreenView | An abstract class for  ScreenViewthat has the common useful methods and the default
 implementations for the abstract methods. | 
| Screen | This dispatches key presses and timers to the current  ScreenView. | 
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