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Additional resources for Actions and Events

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And metaclasses As shown in Figure 2-8, there are usually multiple objects belonging to a given class. The class objects define the structure and behavior of the objects. , the class variables) and the behavior of the class object C. , class and metaclass objects always exist in pairs. As metaclasses again are classes and since every class is an object, metaclasses are also objects and consequently belong to yet another class. This would lead to an infinite regression of class objects and metaclasses.

Rectangles are not points. A point is a mathematical concept, but a rectangle is a figure that can have various visual attributes. Windows are not rectangles . They are not used as graphic shapes, but rather as areas that can be filled which graphic shapes. In all three cases, a has-a relation would have been more appropriate. For example, a stack could have an instance variable of type List that holds the elements, and a window could have a rectangle describing the location and size of the window on the screen.

For example, the message borderWidth (without a colon) returns the line width that will be used when the rectangle is drawn on the screen; the message borderWidth: (with a colon) is used to modify this attribute. We will use this naming convention throughout this book, except when different message names are more appropriate, as is the case with moveTo:, moveBy: and origin. The message moveTo: interprets the argument as absolute coordinates, whereas moveBy: moves the rectangle relative to its current position.

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Actions and Events by Paul Grice

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