56.Software Engineering by John G. Webster (Editor)

By John G. Webster (Editor)

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HyperCard’s object hierarchy determines the order in which scripts are searched for a matching message handler. The type of the message generated determines where in the hierarchy HyperCard begins its search. Once a matching handler is found, HyperCard automatically invokes it. than just navigation. A button can be used to create visual effects, launch other applications, or play QuickTime movies. To place an instance of one of these media element types onto a card, an author chooses the appropriate element type, sets the related properties, and then visually positions the instantiated element onto the card.

The mouseDown handler records the vertical position of the mouse when its button is pressed. The mouseWithin handler updates the paddle location based on how far the mouse has moved vertically and also enforces that the paddle remains within the court (Stage). The Lingo code implementing these handlers is shown in Fig. 11. The script defining the behavior of the ball implements the main logic of the game. Because the player’s interaction with the paddle represents an asynchronous interaction, the script defining the ball’s behavior must be written as a frame script.

Bush emphasized that the most important aspect of this device was the ability to create associative links, or information trails, among documents of particular interest or importance. Information trails would provide a storage and retrieval model that more closely matches how the human mind works. Thus, as a scientist browsed information and discovered pertinent documents, or documents that were especially informative on a certain subject, their trail of knowledge discovery could always be retraced by other scientists.

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