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Changing Class Defaults to Avoid Repetition

Most programmers try to avoid repetition. Thus, if you find yourself rewriting the same lines of code over and over, you place the code in a subroutine or function, or build a library of routines that you can use in many programs. The same reasoning holds for components. If you find yourself changing the same properties or making the same method calls, you can create a new component that does these things by default.

For example, suppose that each time you create an application, you add a dialog box to perform a particular operation. Although it is not difficult to recreate the dialog each time, it is also not necessary. You can design the dialog once, set its properties, and install a wrapper component associated with it onto the Tool palette. By making the dialog into a reusable component, you not only eliminate a repetitive task, but you encourage standardization and reduce the likelihood of errors each time the dialog is recreated.

Modifying an existing component shows an example of changing a component's default properties.

Note: If you want to modify only the published properties of an existing component, or to save specific event handlers for a component or group of components, you may be able to accomplish this more easily by creating a component template.

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