TCustomCheckBox

type TCustomCheckBox = class(TButtonControl)

  class procedure WSRegisterClass; override;

WSRegisterClass - Register this Class for the current Widget Set

protected

  procedure Click; override;

Click - a procedure that allows the programmer to simulate a mouse click over the control, and initiates the same Action as that associated with the OnClick event

  procedure DoClickOnChange; virtual;

  function RetrieveState;

RetrieveState - returns the value for check box state

  procedure InitializeWnd; override;

InitializeWnd calls inherited method and applies any changes

  procedure Toggle; virtual;

Toggle - method to alternate between checked and unchecked states on successive activations

  function DialogChar(); override;

DialogChar - a LCL Key Message; returns True if a Dialog character has an associated message

  function GetChecked; override;

GetChecked - returns True if the button is checked

  procedure SetChecked(); override;

SetChecked - specifies whether or not the button is checked

  procedure RealSetText(); override;

Procedure to store text associated with the control in a string

  procedure ApplyChanges; virtual;

ApplyChanges - method for applying specified changes

protected

  class function GetControlClassDefaultSize; override;

GetControlClassDefaultSize - returns its own defaults, overriding the inherited values

protected

  procedure Loaded; override;

Loaded - sends the State of the box to the interface before calling inherited method

  procedure WSSetText(); override;

WSSetText - writes the name of the current widget set to a local variable

  procedure TextChanged; override;

Procedure to deal with changes in text

  procedure CreateParams(); override;

public

  constructor Create(); override;

Create - constructor for TCustomCheckBox: calls inherited Create then initialises style, and state, bounds, tabstop and autosize

  property AllowGrayed: Boolean; [rw]

Determines whether the check box can be in a "grayed" state.

  property State: TCheckBoxState; [rw]

Indicates whether the check box is checked (selected), unchecked (deselected) or grayed.

  property OnChange;

OnChange - event handler for any change in properties of the control

end;

TCustomCheckBox

TCustomCheckBox is the ancestor of all check-box components.

TButtonControl

TButtonControl : ancestor class for several Button (including Radio Button) and Check Box classes

TWinControl

TControl

TLCLComponent

TLCLComponent - base class for LCL components

TComponent,IUnknown,IInterfaceComponentReference

TPersistent

TObject

TCheckBox

TCheckBox - a small box which can contain a check mark to indicate that it has been selected by a mouse click