TColumn

type TColumn = class(TGridColumn)

protected

  function CreateTitle; override;

CreateTitle - creates a column title and returns it in the result

  function GetDefaultAlignment; override;

GetDefaultAlignment - returns the supplied alignment if valid, otherwise returns the inherited default

  function GetDefaultDisplayFormat;

GetDefaultDisplayFormat - returns a string containing the default format for display

  function GetDefaultValueChecked; override;

GetDefaultValueChecked - if the value of the checked item is boolean, returns the boolean expressed as a string

  function GetDefaultValueUnchecked; override;

GetDefaultValueUnchecked - if the value of the unchecked item is boolean, returns the boolean expressed as a string

  function GetDefaultVisible; override;

GetDefaultVisible - returns the default value for the Visible property

  function GetDisplayName; override;

GetDisplayName - if a field has been assigned, return the name of the field otherwise calls inherited GetDisplayName

  function GetDefaultReadOnly; override;

GetDefaultReadOnly - if a grid or field have been assigned, gets the default readonly property from the link, otherwise calls inherited GetDefaultReadOnly

  function GetDefaultWidth; override;

GetDefaultWidth - looks to see if a grid with canvas has been allocated, and gets width from there, otherwise uses global defaut width

  function GetPickList; override;

GetPickList - calls inherited GetPickList, then if there are additional items, adds them before returning

  property IsAutomaticColumn: Boolean; [r]

IsAutomaticColumn - if True, this is an automatic column

  property IsDesignColumn: Boolean; [r]

IsDesignColumn - if True, this is a design column

  procedure LinkField;

LinkField - if the data link is Active, form the link with this feild

public

  constructor Create(); override;

Create - constructor for TColumn: calls inherited Create and sets a design index of appropriate size

  procedure Assign(); override;

Assign - if the Source is a Grid, copies relevant values across, otherwise calls inherited Assign

  function IsDefault; override;

IsDefault - returns True if this column is the default

  property DesignIndex: Integer; [r]

DesignIndex - the likely maximum index value

  property Field: TField; [rw]

The Field in the DataSet that is to be associated with this Column, for display , editinig etc

published

  property FieldName: String; [rw]

The name of the field (as a string), as returned from the dataset

  property DisplayFormat: String; [rws]

The format to be used for display in this column

end;

TColumn

TColumn - one of the physical columns of the display in a DataBase Grid (not necessarily the same as a Column in a SQL database)

TGridColumn

TGridColumn - a column of similar data items in a grid

TCollectionItem

TPersistent

TObject