WinAPI: 输入光标相关的函数[3]

本例测试修改光标的形色, 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}



var

  bit: TBitmap;



procedure TForm1.FormCreate(Sender: TObject);

const

  c = '★';

begin

  RadioGroup1.Caption := '光标形色';

  RadioGroup1.Items.CommaText := '黑色,灰度,自定义';

  RadioGroup1.ItemIndex := 0;



  bit := TBitmap.Create;

  bit.Canvas.Font.Size := 16;

  bit.Width := bit.Canvas.TextWidth(c);

  bit.Height := bit.Canvas.TextHeight(c);

  bit.Canvas.TextOut(0, 0, c);

end;



procedure TForm1.FormDestroy(Sender: TObject);

begin

  SetCaretBlinkTime(530);

  bit.Free;

end;



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

  Shift: TShiftState; X, Y: Integer);

var

  h: HBITMAP;

begin

  DestroyCaret;



  h := 0;

  case RadioGroup1.ItemIndex of

    1: h := 1;

    2: h := bit.Handle;

  end;

  CreateCaret(Handle, h, 4, 32);

  SetCaretPos(X,Y);

  ShowCaret(Handle);

end;



procedure TForm1.RadioGroup1Click(Sender: TObject);

var

  h: HBITMAP;

  pt: TPoint;

begin

  GetCaretPos(pt);

  DestroyCaret;



  h := 0;

  case RadioGroup1.ItemIndex of

    1: h := 1;

    2: h := bit.Handle;

  end;

  CreateCaret(Handle, h, 4, 32);

  SetCaretPos(pt.X, pt.Y);

  ShowCaret(Handle);

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 137

  ClientWidth = 228

  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 = 137

    Top = 16

    Width = 80

    Height = 113

    Caption = 'RadioGroup1'

    TabOrder = 0

    OnClick = RadioGroup1Click

  end

end