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unit Forms;

...

function TCustomForm.ShowModal: Integer;
var
  WindowList: Pointer;
  SaveFocusState: TFocusState;
  SaveCursor: TCursor;
  SaveCount: Integer;
  ActiveWindow: HWnd;
begin
  CancelDrag;
  if Visible or not Enabled or (fsModal in FFormState) or
    (FormStyle = fsMDIChild) then
    raise EInvalidOperation.Create(SCannotShowModal);
  if GetCapture <> 0 then SendMessage(GetCapture, WM_CANCELMODE, 0, 0);
  ReleaseCapture;
  Application.ModalStarted;
  try
    Include(FFormState, fsModal);
    if (PopupMode = pmNone) and (Application.ModalPopupMode <> pmNone) then
    begin
      RecreateWnd;
      HandleNeeded;
    end;
    ActiveWindow := GetActiveWindow;
    SaveFocusState := Forms.SaveFocusState;
    Screen.SaveFocusedList.Insert(0, Screen.FocusedForm);
    Screen.FocusedForm := Self;
    SaveCursor := Screen.Cursor;
    Screen.Cursor := crDefault;
    SaveCount := Screen.CursorCount;
    WindowList := DisableTaskWindows(0);
    try
      Show;
      try
        SendMessage(Handle, CM_ACTIVATE, 0, 0);
        ModalResult := 0;
        repeat
          Application.HandleMessage;
          if Application.Terminated then ModalResult := mrCancel else
            if ModalResult <> 0 then CloseModal;
        until ModalResult <> 0;
        Result := ModalResult;
        SendMessage(Handle, CM_DEACTIVATE, 0, 0);
        if GetActiveWindow <> Handle then ActiveWindow := 0;
      finally
        Hide;
      end;
    finally
      if Screen.CursorCount = SaveCount then
        Screen.Cursor := SaveCursor
      else Screen.Cursor := crDefault;
      EnableTaskWindows(WindowList);
      if Screen.SaveFocusedList.Count > 0 then
      begin
        Screen.FocusedForm := Screen.SaveFocusedList.First;
        Screen.SaveFocusedList.Remove(Screen.FocusedForm);
      end else Screen.FocusedForm := nil;
      if ActiveWindow <> 0 then SetActiveWindow(ActiveWindow);
      RestoreFocusState(SaveFocusState);
      Exclude(FFormState, fsModal);
    end;
  finally
    Application.ModalFinished;
  end;
end;

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