TDataModule¶

Container for non-visual components.

Declaration¶

Source position: classesh.inc line 2881

type

  TDataModule = class(TComponent)
  public
    constructor Create;
    constructor CreateNew(AOwner: TComponent);
    constructor CreateNew(AOwner: TComponent; CreateMode: Integer);
    destructor Destroy;
    procedure AfterConstruction;
    procedure BeforeDestruction;
    property DesignOffset: TPoint; {rw}
    property DesignSize: TPoint; {rw}
    property DesignPPI: Integer; {rw}
  published
    property OnCreate: TNotifyEvent; {rw}
    property OnDestroy: TNotifyEvent; {rw}
    property OldCreateOrder: Boolean; {rw}
  end;

Inheritance¶

Description¶

TDataModule is a container for non-visual objects which can be used in an IDE to group non-visual objects which can be used by various other containers (forms) in a project. Notably, data access components are typically stored on a datamodule. Web components and services can also be implemented as descendants of datamodules.

TDataModule introduces some events which make it easier to program, and provides the needed streaming capabilities for persistent storage.

An IDE will typically allow to create a descendant of TDataModule which contains non-visual components in it's published property list.

Properties¶

Member	Visibility	Description
DesignOffset	public	Position property needed for manipulation in an IDE.
DesignPPI	public	Design Time PPI.
DesignSize	public	Size property needed for manipulation in an IDE.
OldCreateOrder	published	Determines when OnCreate and OnDestroy are triggered.

See all Properties

Methods¶

Member	Visibility	Description
AfterConstruction	public	Overrides standard TObject behaviour.
BeforeDestruction	public
Create	public	Create a new instance of a TDataModule.
CreateNew	public
Destroy	public	Destroys the TDataModule instance.

See all Methods

Events¶

Member	Visibility	Description
OnCreate	published	Event handler, called when the datamodule is created.
OnDestroy	published	Event handler, called when the datamodule is destroyed.

See all Events