Developing Custom Delphi Components by Ray Konopka

By Ray Konopka

Contains the Delphi item Pascal item version. Covers VCL part structure, multi-control parts, and part DLLs. Explains part construction and debugging, and box safety and entry rights. Clarifies item Pascal exceptions and exception dealing with. exhibits you ways to exploit some of the top Delphi controls to be had to construct home windows functions. Tells approximately imposing homes, estate editors, and occasions and occasion handlers.

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Delphi’s New Object Model 43 controls are descendants of the TControl class, it is possible to use a class reference type to create the desired control. Specifically, the TControlClass is declared as being a class reference type for the TControl class. Therefore, any instance of TControlClass can be assigned to any class that descends from TControl. For example, in the following code, the Reference variable is assigned to TEdit if the OptEdit radio button is checked by the user. However, the key portion of this method is the point where the control is actually created.

Properties play such an important role in component development that I need an entire chapter to provide adequate coverage. Logical Properties The notion of a property is not a new concept. On the contrary, properties are very familiar to object-oriented programmers. This is partly due to the fact that things in the real world, which classes are designed to mimic, possess properties. Properties are characteristics or attributes that distinguish one object from others. For example, two bookcases can be uniquely identified by finding the differences in their properties such as color, height, and shelf count.

End; This situation is handled quite differently in Delphi. Since it is no longer necessary to create pointer object types, the concept of creating a forward class declaration has been introduced. This is very similar to declaring forward procedure references in standard Pascal. However, the reserved word class is used instead of forward. For example, the following statement is a forward declaration for the TSample class. type TSample = class; 32 Chapter 2 Now TSample can be referenced within another class without having to be completely declared.

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