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uses
  SizeGrip;

// ...

procedure TForm1.FormCreate(Sender: TObject);
begin
  // ...
  with TSizeGripThemed.Create(Self) do
    TargetControl := Self;
end;					

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unit DockingSizeGrip;

interface

uses
  SysUtils, Classes, Controls, Messages, Types, Graphics, TB2Dock, TB2ToolWindow;

type
  TSizeGripCorner=(sgc_northwest,sgc_northeast,sgc_southwest,sgc_southeast);

  TDockingSizeGrip=class;

  TTBSizeGripToolWindow=class(TTBToolWindow)
  private
    FSizeGrip:TDockingSizeGrip;
    FOnDockChanged:TNotifyEvent;
    procedure DockChanged(Sender:TObject);
  protected
    procedure CreateWnd; override;
    procedure CreateParams(var Params: TCreateParams); override;
    procedure DestroyWnd; override;
  public
  published
    property OnDockChanged:TNotifyEvent read FOnDockChanged write FOnDockChanged;
  end;

  TDockingSizeGrip = class(TCustomControl)
  private
    FStartX: Integer;
    FStartY: Integer;
    FMoving: Boolean;
    FTargetControl:TWinControl;
    FOwner:TWinControl;
    FRegion:THandle;
    FCorner:TSizeGripCorner;
    FBasepoints:array[TSizeGripCorner] of TPoint;
    procedure Adjust;
    procedure AdjustParent(diffx,diffy:integer);
    procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
    procedure SetTargetControl(value:TWinControl);
    procedure SetCorner(value:TSizeGripCorner);
    procedure WMSize(var Msg: TWMSize); message WM_SIZE;
    procedure EnableRegion;
    procedure DisableRegion;
    procedure CalculateBasePoints;
  protected
    procedure CreateWnd; override;
    procedure DestroyWnd; override;
    procedure SelectCursor(X, Y: Integer);
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
      X, Y: Integer); override;
    procedure Paint; override;
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property TargetControl:TWinControl read FTargetControl write SetTargetControl;
    property Corner:TSizeGripCorner read FCorner write SetCorner;
    property Color;
    property Visible;
  end;

procedure Register;

implementation

uses
  Windows, Forms, Math;

const
  gripcorners:array[TSizeGripCorner,0..2] of TSizeGripCorner=
    ((sgc_northwest,sgc_northeast,sgc_southwest),
     (sgc_northwest,sgc_northeast,sgc_southeast),
     (sgc_northwest,sgc_southwest,sgc_southeast),
     (sgc_northeast,sgc_southeast,sgc_southwest));

procedure Register;
begin
  RegisterComponents('Eigene', [TDockingSizeGrip,TTBSizeGripToolWindow]);
end;

(***************** TTBSIZEGRIPTOOLWINDOW ***********************)

procedure TTBSizeGripToolWindow.CreateWnd;
begin
  inherited CreateWnd;
  FSizeGrip:=TDockingSizeGrip.Create(self);
  FSizeGrip.TargetControl:=self;
end;

procedure TTBSizeGripToolWindow.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  inherited OnDockChanged:=DockChanged;
end;

procedure TTBSizeGripToolWindow.DestroyWnd;
begin
  FSizeGrip.Free;
  FsizeGrip:=nil;
  inherited DestroyWnd;
end;

procedure TTBSizeGripToolWindow.DockChanged(Sender: TObject);
begin
  if assigned(FSizeGrip) then begin
    if floating then FSizeGrip.Visible:=false
      else begin
        FSizeGrip.Visible:=true;
        if Assigned(CurrentDock) then begin
          case CurrentDock.position of
            dpRight: FSizeGrip.Corner:=sgc_southwest;
            dpLeft:  FSizeGrip.Corner:=sgc_southeast;
            dpTop:   FSizeGrip.Corner:=sgc_southeast;
            dpBottom:FSizeGrip.Corner:=sgc_northeast;
          end; {case}
        end; {if}
      end; {else}
  end; {if}
  if assigned(FOnDockChanged) then FOnDockChanged(sender);
end;

(******************* TDOCKINGSIZEGRIP **************************)

constructor TDockingSizeGrip.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FCorner:=sgc_southeast;
  anchors:=[akRight,akBottom];
  FOwner:=TWinControl(AOwner);
  Width:=16;
  Height:=16;
  if AOwner is TWinControl then TargetControl:=TWinControl(AOwner);
end;

procedure TDockingSizeGrip.SetTargetControl(value: TWinControl);
begin
  if value<>FTargetControl then begin
    FTargetControl:=value;
    if value<>nil then parent:=value
      else parent:=FOwner;
  end; {if}
  Adjust;
end;

procedure TDockingSizeGrip.SetCorner(value:TSizeGripCorner);
begin
  if value<>Fcorner then begin
    disableregion;
    Fcorner:=value;
    enableregion;
    case FCorner of
      sgc_northwest:anchors:=[akLeft,akTop];
      sgc_northeast:anchors:=[akRight,akTop];
      sgc_southwest:anchors:=[akLeft,akBottom];
      sgc_southeast:anchors:=[akRight,akBottom];
    end; {case}
    Adjust;
  end; {if}
end;

procedure TDockingSizeGrip.CalculateBasePoints;
var
  c:TSizeGripCorner;
  xx,yy:integer;
begin
  c:=low(TSizeGripCorner);
  for yy := 0 to 1 do
    for xx := 0 to 1 do
      with FBasePoints[c] do begin
        x:=xx*width;
        y:=yy*height;
        inc(c);
      end; {with}
end;

procedure TDockingSizeGrip.EnableRegion;
var
  pt:array[0..2] of TPoint;
  i:integer;
begin
  CalculateBasePoints;
  for i:=0 to 2 do
    pt[i]:=FBasePoints[gripcorners[FCorner,i]];
  FRegion:=CreatePolygonRgn(pt,3,WINDING);
  SetWindowRgn(handle,FRegion,true);
end;

procedure TDockingSizeGrip.DisableRegion;
begin
  if FRegion<>0 then begin
    SetWindowRgn(handle,0,true);
    DeleteObject(FRegion);
    FRegion:=0;
  end; {if}
end;

procedure TDockingSizeGrip.CreateWnd;
begin
  inherited CreateWnd;
  EnableRegion;
  Adjust;
end;

procedure TDockingSizeGrip.DestroyWnd;
begin
  DisableRegion;
  inherited DestroyWnd;
end;

destructor TDockingSizeGrip.Destroy;
begin
  inherited Destroy;
end;

procedure TDockingSizeGrip.Notification(AComponent: TComponent; Operation: TOperation);
begin
  if (Operation = opRemove) and (AComponent=FTargetControl) then begin
    FTargetControl:=nil;
  end; {if}
  inherited Notification(AComponent, Operation);
end;

procedure TDockingSizeGrip.WMSize(var Msg: TWMSize);
begin
  DisableRegion;
  EnableRegion;
  Invalidate;
end;

procedure TDockingSizeGrip.Adjust;
begin
  if assigned(FTargetControl) then begin
    if FCorner in [sgc_northeast,sgc_southeast] then left:=FTargetControl.ClientWidth-width
      else left:=0;
    if FCorner in [sgc_southwest,sgc_southeast] then top:=FTargetControl.ClientHeight-height
      else top:=0;
    Invalidate;
  end; {if}
end;

procedure TDockingSizeGrip.AdjustParent(diffx,diffy:integer);
begin
  if assigned(FTargetControl) then begin
    if FCorner in [sgc_northeast,sgc_southeast] then FTargetControl.ClientWidth:=FTargetControl.ClientWidth+diffx
      else begin
        FTargetControl.Left:=FTargetControl.Left+diffx;
        FTargetControl.ClientWidth:=FTargetControl.ClientWidth-diffx;
      end; {else}
    if FCorner in [sgc_southwest,sgc_southeast] then FTargetControl.ClientHeight:=FTargetControl.ClientHeight+diffy
      else begin
        FTargetControl.Top:=FTargetControl.Top+diffy;
        FTargetControl.ClientHeight:=FTargetControl.ClientHeight-diffy;
      end; {else}
  end; {if}
end;

procedure TDockingSizeGrip.Paint;
var
  r:TRect;
  diff,i:integer;
begin
  r:=bounds(0,0,width,height);
  with canvas do begin
    brush.Style:=bsSolid;
    brush.Color:=Color;
    fillrect(r);
    pen.Style:=psSolid;
    for i := 0 to max(width,height) div 4 do
      for diff := 0 to 2 do begin
        if diff=2 then pen.Color:=clWindow
          else pen.Color:=clBtnShadow;
        case FCorner of
          sgc_northwest:begin
            moveto(r.Left,r.Top+i*4+diff);
            lineto(r.Left+i*4+diff,r.Top);
          end; {northwest}
          sgc_northeast:begin
            moveto(r.Right,r.Top+i*4+diff);
            lineto(r.Right-i*4-diff,r.Top);
          end; {northeast}
          sgc_southwest:begin
            moveto(r.Left,r.Bottom-i*4-diff);
            lineto(r.Left+i*4+diff,r.Bottom);
          end; {southwest}
          sgc_southeast:begin
            moveto(r.Right,r.Bottom-i*4-diff);
            lineto(r.Right-i*4-diff,r.Bottom);
          end; {southeast}
        end; {case}
      end; {for}
  end; {with}
end;

procedure TDockingSizeGrip.SelectCursor(X, Y: longint);
begin
  if (y>0) and (y<=height) and (x>0) and (x<=width) then begin
    if FCorner in [sgc_southeast,sgc_northwest] then screen.Cursor:=crSizeNWSE
      else screen.Cursor:=crSizeNESW;
  end
    else Screen.Cursor:=crDefault;
end;

procedure TDockingSizeGrip.MouseMove(Shift: TShiftState; X, Y: Integer);
begin
  if FMoving then begin
    AdjustParent(X-FStartX,Y-FStartY);
    Adjust;
  end
    else SelectCursor(X, Y);
  inherited MouseMove(Shift, X, Y);
end;

procedure TDockingSizeGrip.MouseDown(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
begin
  FMoving := True;
  FStartX := X;
  FStartY := Y;
  inherited MouseDown(Button, Shift, X, Y);
end;

procedure TDockingSizeGrip.MouseUp(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
begin
  SelectCursor(X, Y);
  FStartX := 0;
  FStartY := 0;
  inherited MouseUp(Button, Shift, X, Y);
  FMoving := False;
  Adjust;
end;

procedure TDockingSizeGrip.CMMouseEnter(var Message: TMessage);
var
  Pos: TPoint;
begin
  if not (csDesigning in ComponentState) then begin
    Pos := ScreenToClient(Mouse.CursorPos);
    SelectCursor(Pos.X, Pos.Y);
  end; {if}
end;

procedure TDockingSizeGrip.CMMouseLeave(var Message: TMessage);
begin
  if not (csDesigning in ComponentState) then begin
    if not FMoving then Screen.Cursor := crDefault;
  end; {if}
end;

end.