学习 Message(10): WM_CancelMode 消息测试

启动模式窗口, 当前窗口会收到一条 WM_CancelMode 消息; 改消息无参数.

---

本例效果图:

---

代码文件:

---

unit Unit1;



interface



uses

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

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Memo1: TMemo;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    procedure FormCreate(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

  protected

    procedure WMCancelMode(var Message: TWMCancelMode); message WM_CANCELMODE;

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  Memo1.Align := alLeft;

  Memo1.ScrollBars := ssVertical;

  Memo1.Clear;

  Position := poScreenCenter;

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

  ShowMessage('ShowMessage');

end;



procedure TForm1.Button2Click(Sender: TObject);

begin

  InputBox('InputBox','Input','');

end;



procedure TForm1.Button3Click(Sender: TObject);

begin

  MessageBox(Handle, 'Test', 'MessageBox', 0);

end;



procedure TForm1.Button4Click(Sender: TObject);

var

  form: TForm;

begin

  form := TForm.Create(Self);

  form.Caption := 'Test';

  form.Width := Width div 2;

  form.Height := Height div 2;

  form.Position := poDesktopCenter;

  form.ShowModal;

end;



procedure TForm1.WMCancelMode(var Message: TWMCancelMode);

begin

  Memo1.Lines.Add('收到 WMCancelMode 消息');

  Message.Result := 0;

end;



end.


 
   

窗体文件:

---

object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 161

  ClientWidth = 301

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  PixelsPerInch = 96

  TextHeight = 13

  object Memo1: TMemo

    Left = 8

    Top = 8

    Width = 185

    Height = 89

    Lines.Strings = (

      'Memo1')

    TabOrder = 0

  end

  object Button1: TButton

    Left = 207

    Top = 23

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 1

    OnClick = Button1Click

  end

  object Button2: TButton

    Left = 207

    Top = 54

    Width = 75

    Height = 25

    Caption = 'Button2'

    TabOrder = 2

    OnClick = Button2Click

  end

  object Button3: TButton

    Left = 207

    Top = 85

    Width = 75

    Height = 25

    Caption = 'Button3'

    TabOrder = 3

    OnClick = Button3Click

  end

  object Button4: TButton

    Left = 207

    Top = 116

    Width = 75

    Height = 25

    Caption = 'Button4'

    TabOrder = 4

    OnClick = Button4Click

  end

end