啟動模式窗口, 當前窗口會收到一條 WM_CancelMode 消息; 改消息無參數.
本例效果圖:
代碼文件:
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.
窗體文件:
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