只允许建立一次子窗体的MDI程序

王朝delphi·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

procedure OpenChildForm(FormClass: TFormClass; var Fm; AOwner:TComponent);

var

I: Integer;

Child: TForm;

begin

for I := 0 to Screen.FormCount - 1 do

if Screen.Forms[I].ClassType = FormClass then

begin

Child := Screen.Forms[I];

if Child.WindowState = wsMinimized then

ShowWindow(Child.Handle, SW_SHOWNORMAL)

else

ShowWindow(Child.handle,SW_SHOWNA);

if (not Child.Visible) then Child.Visible := True;

Child.BringToFront;

Child.Setfocus;

TForm(Fm) := Child;

Exit;

end;

Child := TForm(FormClass.NewInstance);

TForm(Fm) := Child;

Child.Create(AOwner);

end;

 
 
 
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