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