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Learn about the DelphiVCL.Component as the Common Ancestor of All Component Classes

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DelphiVCL.Component is the common ancestor of all component classes.

Component is the base class for all components. Components are persistent objects that have the following capabilities:

  • IDE integration: The ability to appear on an IDE palette and be manipulated in a Form Designer.
  • Ownership: The ability to manage other components. If component A owns component B, then A is responsible for destroying B when A is destroyed.
  • Streaming and filing: Enhancements of the persistence features inherited from TPersistent.
  • COM support: Components can be converted into ActiveX controls or other COM objects using wizards provided with Windows products. Components can serve as wrappers for COM objects.

Note: COM features are present in all implementations of DelphiVCL.Component or TComponent, including those provided for compatibility with OS X. However, COM features are Windows only and cannot be used in multi-device (cross-platform) applications.

Component does not provide any user interface or display features. These features are provided by two classes that directly descend from Component:

  • DelphiVCL.Control or TControl, in the Vcl.Controls unit, is the base class for visual components in Windows-only (VCL) applications.
  • TControl, in the FMX.Types unit, is the base class for visual components in applications built with the FireMonkey (FMX) framework.

Components that can be visible at run time are sometimes called visual components. Other components, which are never visible at run time, are sometimes called non-visual components. However it is more common to refer to visual components as controls and non-visual components simply as components.

Do not create instances of Component. Use Component as a base class when declaring non-visual components that can appear on the component palette and be used in the Form Designer. Properties and methods of Component provide basic behavior that descendant classes inherit as well as behavior that components can override to customize their behavior.

Let’s browse all the properties, methods, and built-in properties of the DelphiVCL.Component using dir() command:

See the responses in our Windows command prompt:

0dir 2458772

You can also read short informations about the DelphiVCL.Component using the print() command:

See the responses in our Windows command prompt:

0print 7872078


Check out DelphiVCL which easily allows you to build GUIs for Windows using Python.

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