procedure TForm1.PageControl1Changing(Sender: TObject; var AllowChange: Boolean); begin AllowChange := false; end;
procedure TForm1.PageControl1Changing(Sender: TObject; var AllowChange: Boolean); begin if 条件成立 then AllowChange := false else AllowChange := True; end;
var AllowChange: Boolean);
begin
AllowChange := false;
end;
var AllowChange: Boolean);
begin
if 条件成立 then
AllowChange := false
else
AllowChange := True;
end;