unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OleServer, MSINKAUTLib_TLB, ExtCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    InkCLT: TInkCollector;
    InkRC: TInkRecognizerContext;
    Panel1: TPanel;
    Button1: TButton;
    edtName: TEdit;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Edit1: TEdit;
    procedure FormCreate(Sender: TObject);
    procedure InkCLTStroke(ASender: TObject; const Cursor: IInkCursor;
      const Stroke: IInkStrokeDisp; var Cancel: WordBool);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
    procedure InitializeInkCollector;
    function  DeleteStr(str :WideString):WideString;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

//------- ×Ô¶¨Ò庯Êý ------------------------------
//³õʼ»¯InkCLT
procedure TForm1.InitializeInkCollector;
begin
  InkCLT.hWnd := panel1.Handle;
  InkCLT.Enabled := true;
  InkCLT.DefaultDrawingAttributes.Color := clRed; // Ä«Ë®ÑÕÉ«
  InkCLT.DefaultDrawingAttributes.Width := 200; // ±ÊµÄ¿í¶È
end;

function TForm1.DeleteStr(str :WideString):WideString;
var
  LengthOfText: Integer;
begin
  LengthOfText := Length(str);
  if LengthOfText > 0 then
  begin
    // ɾ³ý×îºóÒ»¸ö×Ö·û
    Delete(str, LengthOfText, 1);
  end;
  Result := str;
end;
//-------------------------------------------------

procedure TForm1.FormCreate(Sender: TObject);
begin
  InitializeInkCollector;
end;

procedure TForm1.InkCLTStroke(ASender: TObject; const Cursor: IInkCursor;
  const Stroke: IInkStrokeDisp; var Cancel: WordBool);
//var
//  ActiveCtrl: TWinControl;
begin
  //·µ»Øµ±Ç°ÓµÓн¹µãµÄ¿Ø¼þ
  //ActiveCtrl := Screen.ActiveControl;
  //if ActiveCtrl is TEdit then
  //  TEdit(ActiveCtrl).Text := TEdit(ActiveCtrl).Text + Stroke.Ink.Strokes.ToString
  //else if ActiveCtrl is TMemo then
  //  TMemo(ActiveCtrl).Lines.Add(Stroke.Ink.Strokes.ToString);
    Edit1.Text := Stroke.Ink.Strokes.ToString;
  //else
  //  ShowMessage('Ìáʾ£ºµ±Ç°½¹µã²»Ôڱ༭¿ò»ò¶àÐб༭¿òÉÏ.');
end;

//Çå¿ÕÊÖдÇø
procedure TForm1.Button1Click(Sender: TObject);
begin
  InkCLT.Ink.DeleteStrokes(InkCLT.Ink.Strokes);
  Edit1.Clear;
  Panel1.Refresh;
end;

//ɾ³ýÒ»¸ö×Ö£¬ÒªÍ³¼Æÿ¸ö×ÖÓжàÉÙ±Ú»­£¬InkÖ»ÄÜ×·×ٱʻ­£¬°´±Ê»­À´É¾³ý£¡£¡£¡
procedure TForm1.Button2Click(Sender: TObject);
var
  Strokes: IInkStrokes;
  LastStroke: IInkStrokeDisp;
begin
  //Edit1.Text := DeleteStr(Edit1.Text);

  if InkCLT.Ink.Strokes.Count > 0 then
  begin
    Strokes := InkCLT.Ink.Strokes;
    LastStroke := Strokes.Item(Strokes.Count - 1) as IInkStrokeDisp;
    InkCLT.Ink.DeleteStroke(LastStroke);
  end;
end;

//È·Èϱ¸Ñ¡×Ö
procedure TForm1.Button3Click(Sender: TObject);
begin
  edtName.Text := edtName.Text + Trim(Edit1.Text);
  Button1Click(Sender);
end;

//ɾ³ýEdit1µÄÒ»¸ö×Ö
procedure TForm1.Button4Click(Sender: TObject);
begin
  edtName.Text := DeleteStr(edtName.Text);
end;

end.