System.Win.TaskbarCore.TTaskbarHandler
Delphi
TTaskbarHandler = class(TComponent)
C++
class PASCALIMPLEMENTATION TTaskbarHandler : public System::Classes::TComponent
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
class | public | System.Win.TaskbarCore.pas System.Win.TaskbarCore.hpp |
System.Win.TaskbarCore | System.Win.TaskbarCore |
Description
TComponent is the common ancestor of all component classes.
System.Win.TaskbarCore.TTaskbarHandler inherits from System.Classes.TComponent. All content below this line refers to System.Classes.TComponent.
TComponent is the common ancestor of all component classes.
TComponent 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 componentB
, thenA
is responsible for destroyingB
whenA
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.
TComponent does not provide any user interface or display features. These features are provided by two classes that directly descend from TComponent:
- TControl, in the FMX.Types unit, is the base class for visual components in applications built with the FireMonkey (FMX) framework.
- TControl, in the Vcl.Controls unit, is the base class for visual components in Windows-only (VCL) applications.
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 TComponent. Use TComponent 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 TComponent provide basic behavior that descendant classes inherit as well as behavior that components can override to customize their behavior.