TEdit, TSpinEdit

Code:

unit HintEdit;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

StdCtrls;

type

THintEdit = class(TCustomEdit)

private

   { Private declarations }

   FHintList: TStrings;

   Searching,

     CanSearch: boolean;

   CurSPos: integer;

protected

   { Protected declarations }

   procedure Change; override;

   procedure KeyDown(var Key: Word; Shift: TShiftState); override;

public

   { Public declarations }

   constructor Create(AOwner: TComponent); override;

   property HintList: TStrings read FHintList write FHintList;

   destructor Destroy; override;

published

   { Published declarations }

   property Anchors;

   property AutoSelect;

   property AutoSize;

   property BiDiMode;

   property BorderStyle;

   property CharCase;

   property Color;

   property Constraints;

   property Ctl3D;

   property DragCursor;

   property DragKind;

   property DragMode;

   property Enabled;

   property Font;

   property HideSelection;

   property ImeMode;

   property ImeName;

   property MaxLength;

   property OEMConvert;

   property ParentBiDiMode;

   property ParentColor;

   property ParentCtl3D;

   property ParentFont;

   property ParentShowHint;

   property PasswordChar;

   property PopupMenu;

   property ReadOnly;

   property ShowHint;

   property TabOrder;

   property TabStop;

   property Text;

   property Visible;

   property OnChange;

   property OnClick;

   property OnDblClick;

   property OnDragDrop;

   property OnDragOver;

   property OnEndDock;

   property OnEndDrag;

   property OnEnter;

   property OnExit;

   property OnKeyDown;

   property OnKeyPress;

   property OnKeyUp;

   property OnMouseDown;

   property OnMouseMove;

   property OnMouseUp;

   property OnStartDock;

   property OnStartDrag;

end;

procedure Register;

implementation

{$R *.DCR}

procedure Register;

begin

RegisterComponents('Netscape', [THintEdit]);

end;

constructor THintEdit.Create;

begin

inherited;

FHintList := TStringList.Create;

Searching := false;

CanSearch := true;

CurSPos := -1;

end;

procedure THintEdit.Change;

var

i, l: integer;

begin

if Searching then

   Exit;

if not CanSearch then

   Exit;

if Text = '' then

   exit;

l := Length(Text);

for i := 0 to FHintList.Count - 1 do

   if Copy(FHintList[i], 1, l) = Text then

   begin

     Searching := true;

     CurSPos := i;

     Text := FHintList[i];

     Searching := false;

     SelStart := Length(Text);

     SelLength := -(Length(Text) - l);

     break;

   end;

inherited;

end;

procedure THintEdit.KeyDown;

var

l: integer;

begin

if Chr(Key) in ['A'..'z', 'А'..'Я', 'а'..'я'] then

   CanSearch := true

else

   CanSearch := false;

case Key of

   VK_DOWN:

     begin

       if (CurSPos < HintList.Count - 1) and (SelLength > 0) then

         if Copy(FHintList[CurSPos + 1], 1, SelStart) = Copy(Text, 1, SelStart)

           then

         begin

           l := SelStart;

           Inc(CurSPos);

           Text := FHintList[CurSPos];

           SelStart := Length(Text);

           SelLength := -(Length(Text) - l);

         end;

       Key := VK_RETURN;

     end;

   VK_UP:

     begin

       if (CurSPos > 0) and (SelLength > 0) then

         if Copy(FHintList[CurSPos - 1], 1, SelStart) = Copy(Text, 1, SelStart)

           then

         begin

           l := SelStart;

           Dec(CurSPos);

           Text := FHintList[CurSPos];

           SelStart := Length(Text);

           SelLength := -(Length(Text) - l);

         end;

       Key := VK_RETURN;

     end;

   VK_RETURN:

     begin

       SelStart := 0;

       SelLength := Length(Text);

     end;

end;

inherited;

end;

destructor THintEdit.Destroy;

begin

FHintList.Free;

inherited;

end;