WinAPI: 输入光标相关的函数[2]

本例测试修改光标的设置闪烁速度, 注意这会影响到其他程序, 退出时应恢复到系统默认的 530 毫秒.

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本例效果图:

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代码文件:

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unit Unit1;



interface



uses

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

  Dialogs, StdCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    RadioGroup1: TRadioGroup;

    procedure FormCreate(Sender: TObject);

    procedure FormMouseUp(Sender: TObject; Button: TMouseButton;

      Shift: TShiftState; X, Y: Integer);

    procedure RadioGroup1Click(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  RadioGroup1.Caption := '光标闪烁速度(毫秒)';

  RadioGroup1.Items.CommaText := '1000,500,200';

end;



procedure TForm1.FormDestroy(Sender: TObject);

begin

  SetCaretBlinkTime(530);

end;



procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;

  Shift: TShiftState; X, Y: Integer);

begin

  DestroyCaret;

  CreateCaret(Handle, 0, 0, 20);

  SetCaretPos(X,Y);

  ShowCaret(Handle);

end;



procedure TForm1.RadioGroup1Click(Sender: TObject);

var

  ms: Cardinal;

begin

  ms := StrToIntDef(RadioGroup1.Items[RadioGroup1.ItemIndex], 530);

  SetCaretBlinkTime(ms);

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 137

  ClientWidth = 298

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  OnDestroy = FormDestroy

  OnMouseUp = FormMouseUp

  PixelsPerInch = 96

  TextHeight = 13

  object RadioGroup1: TRadioGroup

    Left = 160

    Top = 8

    Width = 130

    Height = 113

    Caption = 'RadioGroup1'

    TabOrder = 0

    OnClick = RadioGroup1Click

  end

end