Title: Designer instance for DataModules
Question: I can retreive instance of Designer for forms as their property "Designer", but how to retreive it for DataModule like objects?
Answer:
For receiving instance of Designer for forms you should just get form's property "Designer".
But how to receive the Designer instance if you have only DataModule's instance?
It is very simply: the DataModule is an usual VCL component and its owner is hidden form, so for retreiving Designer instance of DataModule just retreive "Designer" property of DataModule's owner.
The function below demonstrates retreiving Designer instance for any form in your project by its name. This function is useful when Designer instance is necessary for your experts.
Add these definitions:
{$IFDEF VER120}
TFormDesigner= IFormDesigner;
{$ENDIF}
{$IFDEF VER125}
TFormDesigner= IFormDesigner;
{$ENDIF}
{$IFDEF VER130}
TFormDesigner= IFormDesigner;
{$ENDIF}
function GetDesigner(FToolServices: TIToolServices; FormName: string): TFormDesigner;
var
tmpC: TComponent;
begin
Result := nil;
with FToolServices.GetFormModuleInterface(FormName).GetFormInterface.GetFormComponent do begin
tmpC := GetComponentHandle;
if (tmpC is TCustomForm) then begin
// We have the usual form
Result := TFormDesigner(TCustomForm(tmpC).Designer);
Exit;
end
else
// We have the DataModule or WebModule or something else
Result := TFormDesigner(TCustomForm(tmpc.Owner).Designer);
end;
end;
For receiving Designer without using ToolServices you can use following function:
finction GetDesigner(AComp: TComponent): TFormDesigner;
var
tmpC: TComponent;
begin
Result = nil;
if not Assigned(AComp) then Exit;
if AComp is TCustomForm then
Result := TFormDesigner(TCustomForm(AComp).Designer)
else begin
tmpC := AComp;
while true do begin
if Assigned(tmpC.Owner) then tmpC := tmpC.Owner
else break;
if tmpC is TCustomForm then begin
Result := TFormDesigner(TCustomForm(AComp).Designer);
break;
end;
end;
end;
end;