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lynkfs

mouse position

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The 'featured demo' : Mouse Coordinates project compiles ok but results in error

uncaught Object not instantiated in TW3CustomControl._setMouseMove [line: 5783, column: 21, file: SmartCL.Components]

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Thank you. This is one of the really old demos where lots of code is in TForm1.InitializeObject. When that is done, you run the risk of everything not being initialized when your code runs.

Standard fix is to move the code to TForm1.InitializeForm:

type
  TForm1 = class(TW3Form)
  private
    {$I 'Form1:intf'}
    FIsCapture: boolean;
    function MakeMouseEvent(label: TW3Label; name: string): TMouseEvent;
    function MouseToStr(shift: TShiftState; x, y: integer; scrXY: TPoint): string;
  protected
    procedure InitializeForm; override;
    procedure InitializeObject; override;
  end;

implementation

{ TForm1}

procedure TForm1.InitializeObject;
begin
  inherited;
  {$I 'Form1:impl'}
end;

procedure TForm1.InitializeForm;

  procedure EndCapture;
  begin
    W3pnlSetCapture.Visible := true;
    W3pnlReleaseCapture.Visible := false;
    W3Panel2.OnMouseUp := nil;
    FIsCapture := false;
  end;

begin
  inherited;

  OnMouseMove := MakeMouseEvent(W3lblFormCoords, 'Form');
  W3Panel1.OnMouseMove := MakeMouseEvent(W3lblPanel1Coords, 'Panel1');

 

 

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