TCollectionItem

[Properties (by Name)][Methods (by Name)][Events (by Name)]

Basic object that is managed by a TCollection class.

Declaration

Source position: classesh.inc line 484

Type
  TCollectionItem = class (TPersistent)
  private
    FCollection : TCollection;
    FID : Integer;
    FUpdateCount : Integer;
    function GetIndex : Integer;
  protected
    procedure SetCollection(Value: TCollection);  Virtual;
    procedure Changed(AllItems: Boolean);
    function GetOwner : TPersistent;  Override;
    function GetDisplayName : string;  Virtual;
    procedure SetIndex(Value: Integer);  Virtual;
    procedure SetDisplayName(const Value: string);  Virtual;
    UpdateCount : Integer;
  public
    constructor Create(ACollection: TCollection);  Virtual;
    destructor Destroy;  Override;
    function GetNamePath : string;  Override;
    Collection : TCollection;
    ID : Integer;
    Index : Integer;
    DisplayName : string;
  end
  ;

Description

TCollectionItem and TCollection form a pair of base classes that manage a collection of named objects. The TCollectionItem is the named object that is managed, it represents one item in the collection. An item in the collection is represented by three properties: TCollectionItem.DisplayName , TCollection.Index]() and TCollectionItem.ID .

A TCollectionItem object is never created directly. To manage a set of named items, it is necessary to make a descendant of TCollectionItem to which needed properties and methods are added. This descendant can then be managed with a TCollection class. The managing collection will create and destroy it's items by itself, it should therefore never be necessary to create TCollectionItem descendants manually.

Members

Member	Type	Visibility	Description
Changed	Method	protected	Method to notify the managing collection that the name or index of this item has changed.
Collection	Property	public	Pointer to the collection managing this item.
Create	Method	public	Creates a new instance of this collection item.
Destroy	Method	public	Destroys this collection item.
DisplayName	Property	public	Name of the item, displayed in the object inspector.
FCollection	Field	private
FID	Field	private
FUpdateCount	Field	private
GetDisplayName	Method	protected	Returns the TCollectionItem.DisplayName of the collectionitem
GetIndex	Method	private
GetNamePath	Method	public	Returns the namepath of this collection item.
GetOwner	Method	protected	Returns the managing collection.
ID	Property	public	Initial index of this item.
Index	Property	public	Index of the item in its managing collection TCollection.Items property.
SetCollection	Method	protected
SetDisplayName	Method	protected	Write method for the TCollectionItem.DisplayName property
SetIndex	Method	protected	Write method for the TCollectionItem.Index property.
UpdateCount	Property	protected

Inheritance

Class	Description
TCollectionItem	Basic object that is managed by a TCollection class.

See also

Name	Description
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
TCollection	Base class to manage collections of named objects.
TCollection	Base class to manage collections of named objects.
TCollection	Base class to manage collections of named objects.

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