TCustomEdit

type TCustomEdit = class(TWinControl)

protected

  procedure WSRegisterClass; override;

WSRegisterClass - Register this Class for the current Widget Set

  procedure CalculatePreferredSize(); override;

CalculatePreferredSize - find default/preferred height and width

  procedure CreateWnd; override;

CreateWnd - calls inherited CreateWnd, then initialises various properties relevant to the Widget Set in use

  procedure TextChanged; override;

Procedure to deal with changes in text

  procedure Change; virtual;

Change - software emulation of the OnChange event

  procedure DoEnter; override;

DoEnter - sets AutoSelect if required then calls inherited method

  procedure DoExit; override;

DoExit - disables AutoSelect then calls inherited method

  function GetCaretPos; virtual;

GetCaretPos - returns the position of the caret or edit cursor

  function GetReadOnly; virtual;

GetReadOnly - returns the boolean ReadOnly status

  function GetSelLength; virtual;

GetSelLength - returns the length of the selected text

  function GetSelStart; virtual;

GetSelStart - returns the position of the start of the selection

  function GetSelText; virtual;

GetSelText - returns the selected text string

  procedure SetCaretPos(); virtual;

SetCaretPos - specifies the position of the caret or edit cursor

  procedure SetEchoMode(); virtual;

SetEchoMode - specifies the echo mode

  procedure SetReadOnly(); virtual;

SetReadOnly - specifies whether ReadOnly applies

  procedure SetSelLength(); virtual;

SetSelLength - specifies the length for the selected text

  procedure SetSelStart(); virtual;

SetSelStart - specifies the position for the start of selection

  procedure SetSelText(); virtual;

SetSelText - specifies the selected text string

  procedure RealSetText(); override;

Procedure to store text associated with the control in a string

  function ChildClassAllowed(); override;

ChildClassAllowed - returns True if the given child class is permitted

  function GetControlClassDefaultSize; override;

GetControlClassDefaultSize returns its own defaults, overriding inherited values

  procedure KeyUp(); override;

KeyUp calls inherited method then processes according to the identity of Key

  procedure WMChar(); message;

WMChar - LCL Message signifying a character

  procedure MouseUp(); override;

MouseUp - a procedure that allows the programmer to simulate a mouse button being Up over the control, and initiates the same Action as that associated with the OnMouseUp event

  property AutoSelect: Boolean; [rw]

AutoSelect : if True, the edit control will select all its text when it receives focus or when the Enter key is pressed.

  property AutoSelected: Boolean; [rw]

AutoSelected : if True, indicates that the edit control has just performed an AutoSelect operation

  property ParentColor;

ParentColor - should the control have the same colour as the parent? Default is true

public

  constructor Create(); override;

Create - constructor for TCustomEdit: calls inherited Create then initialises style, colour, size and various other local variables

  procedure Clear;

Clear - delete all text

  procedure SelectAll;

SelectAll text, for example in order to copy or delete it

  procedure ClearSelection; virtual;

ClearSelection - delete all characters in selected text

  procedure CopyToClipboard; virtual;

CopyToClipboard - put a copy of the selection on the clipboard, while leaving the original text in place

  procedure CutToClipboard; virtual;

CutToClipboard - remove the selected text from its original location and put it on the clipboard

  procedure PasteFromClipboard; virtual;

PasteFromClipboard - put a copy of the clipboard contents at the current writing position

  procedure Undo; virtual;

Undo the last edit action

  property Alignment: TAlignment; [rw]

Alignment - whether text is left- or right-justified, or centered

  property AutoSize;

  property BorderStyle;

BorderStyle - none, or single

  property CanUndo: Boolean; [r]

CanUndo - if True, the Undo action is permitted

  property CaretPos: TPoint; [rw]

CaretPos - the position of the Caret indicator in the text

  property CharCase: TEditCharCase; [rw]

CharCase - rules for what case to use (upper or lower) to display text

  property EchoMode: TEchoMode; [rw]

EchoMode - how to echo keypresses on screen: normal (returning the actual character for that key), all upper or lower case, or a masking character as used in entering passwords

  property HideSelection: Boolean; [rw]

HideSelection: hide the selection when control has no focus

  property MaxLength: Integer; [rw]

MaxLength : maximum length allowed for text string

  property Modified: Boolean; [rw]

Whether the text has been modified

  property OnChange: TNotifyEvent; [rw]

OnChange - event handler for any change in text

  property PasswordChar: Char; [rw]

PasswordChar : the character which appears in the Edit box replacing and masking the actual character typed

  property PopupMenu;

PopupMenu - a context-sensitive menu that pops up when the right mouse button is clicked over this control

  property ReadOnly: Boolean; [rw]

ReadOnly - the contents of the edit box may only be read, not written or erased

  property SelLength: Integer; [rw]

SelLength : the length (in characters) of the text that has been selected for editing

  property SelStart: Integer; [rw]

Sel Start: the index of the character from which selection (for editing) begins

  property SelText: String; [rw]

Sel Text : the string within the edit control that has been selected for editing

  property TabOrder;

The place this control occupies in the list of tabs

  property TabStop;

Is the control in the sequence of controls accessed by successive presses of the Tab key?

  property Text;

Text : the character string contained in the Edit Box

end;

TCustomEdit

TCustomEdit : the base type from which the TEdit Box is derived.

TWinControl

TWinControl - the base class for all windowed controls

TControl

TControl - the main ancestor class for visual controls.

TLCLComponent

TObject