我有一个Delphi MDI应用程序,它有一个客户搜索子表单,只能打开一次(检查isAssigned),但是可以多次打开查看/编辑表单,以便最终用户可以一次打开多个客户( Tabbed),我想做的是能够阻止他们不止一次打开同一个客户记录,在客户表格打开时我将标题设置为客户帐户参考,如果该表格存在,我我希望.BringToFront,如果不是,我会创造它。
为了实现这一目标,最好的方法是什么,因为我在摸不着头脑!
提前致谢。
procedure TfrmCustomerSearch.ViewCustomerExecute(Sender: TObject);
begin
screen.cursor := crappstart;
if not IsMDIChildOpen(frmMainMenu, 'frmCustomerView', pfrmCaption) then
frmCustomerView := TfrmCustomerView.createform(nil,dmCustomerSearchfrm.FDQCustSearchreference.Value,cxGrid1DBTableView1.DataController.FocusedRecordIndex)
else
frmCustomerView.BringToFront;
screen.cursor := crdefault;
end;
function TfrmCustomerSearch.IsMDIChildOpen(const AFormName: TForm; const AMDIChildName, AMDICaption : string): Boolean;
var
i: Integer;
begin
Result := False;
for i := Pred(AFormName.MDIChildCount) DownTo 0 do
if (AFormName.MDIChildren[i].name = AMDIChildName) then
begin
if (AFormName.MDIChildren[i].caption = AMDICaption) then
begin
Result := True;
Break;
end
end;
end;
答案 0 :(得分:2)
尝试更像这样的东西:
procedure TfrmCustomerSearch.ViewCustomerExecute(Sender: TObject);
begin
Screen.Cursor := crAppStart;
try
frmCustomerView := TfrmCustomerView(FindMDIChildOpen(frmMainMenu, TfrmCustomerView, pfrmCaption));
if frmCustomerView = nil then
frmCustomerView := TfrmCustomerView.CreateForm(nil, dmCustomerSearchfrm.FDQCustSearchreference.Value, cxGrid1DBTableView1.DataController.FocusedRecordIndex);
frmCustomerView.BringToFront;
finally
Screen.Cursor := crDefault;
end;
end;
function TfrmCustomerSearch.FindMDIChildOpen(const AParentForm: TForm; const AMDIChildClass: TFormClass; const AMDICaption : string): TForm;
var
i: Integer;
Child: TForm;
begin
Result := nil;
for i := Pred(AParentForm.MDIChildCount) DownTo 0 do
begin
Child := AParentForm.MDIChildren[i];
if Child.InheritsFrom(AMDIChildClass) and
(Child.Caption = AMDICaption) then
begin
Result := Child;
Exit;
end;
end;
end;