How to change the mouse speed

Problem/Question/Abstract:

How to change the mouse speed

Answer:

Solve 1:

The mouse speed is changed in seven steps. Adjust the values in mspeed, if you like.


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

var
  check: array[0..2] of Integer;

const
  mspeed: array[0..6, 0..2] of Integer = ((0, 0, 0), (10, 0, 1), (7, 0, 1), (4, 0, 1), (4, 10, 2), (4, 7, 2), (4, 4, 2));
  tempo: Integer = -1;

procedure step;
begin
  inc(tempo);
  if tempo > 6 then
    tempo := 0;
  systemparametersinfo(SPI_SETMOUSE, 1, @mspeed[tempo], 0);
  form1.label1.caption := 'Step: ' + inttostr(tempo + 1);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  systemparametersinfo(SPI_GETMOUSE, 0, @check, 0);
  step;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  systemparametersinfo(SPI_SETMOUSE, 1, @check, 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  step;
end;

end.


Solve 2:

Use SystemParameters info as shown below.


type
  TMouseTresholdSpeed = array[0..2] of Cardinal;

function GetMouseTresholdSpeed: TMouseTresholdSpeed;
{ Retrieves the two mouse threshold values and the mouse speed }
begin
  SystemParametersInfo(SPI_GETMOUSE, 0, @Result, 0);
end;

procedure SetMouseTresholdSpeed(Value: TMouseTresholdSpeed);
{ Sets the two mouse threshold values and the mouse speed }
begin
  SystemParametersInfo(SPI_SETMOUSE, 0, @Value, 0);
end;