Choosing a Group programmatically at run time

rbuser

Hi there,

I've got a report that we sort on a couple of different indexes depending on
what the users need to see.
I'd like to be able to setup several group footers to give a different set
of break totals depending on the index chosen. I have created several
appropriate Groups but can't figure out how to get them to selectively print
when required.

Is it possible to do this programmatically before calling report.print. Or
any way that will work for that matter?

Thanks in advance.
Regards,
Bruce Rogers.

nicocizik

Hi Bruce,

It is possible to control which groups are used in your report using the
TppReport.AddGroup and TppReport.RemoveGroup routines. Documentation on
these methods can be found in the RBuilder.hlp file.

--
Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com

rbuser

Thanks Nico,

That looks like it does the trick.

Regards,
Bruce.

rbuser

Hi Nico,

I spoke too soon, I'm getting odd results here's what I'm trying.

The only band in each group that has anything in it is the footer, that's
where I want the sub total stuff.

ppReport1.RemoveGroup(ppGroup1);
ppReport1.RemoveGroup(ppGroup2);
ppReport1.Print;

This stops the breaks firing during the report but both footer bands print
at the end of the report.

To conditionally switch them on I tried,

ppReport1.RemoveGroup(ppGroup1);
ppReport1.RemoveGroup(ppGroup2);
if IndexA then
begin
set index to A;
ppReport1.AddGroup(ppGroup1);
end else
if IndexB then
begin
set Index to B;
ppReport1.AddGroup(ppGroup2);
end;

This gave inconsistent results the breaks fired a lot more that they should
have.
If you leave the fiddle with group code out the reports print perfectly,
swaps sort order etc. The both breaks print in the correct positions etc.

What am I missing here?

Thanks and regards,
Bruce.

nicocizik

Hi Bruce,

Sorry, my previous advise was incorrect. Instead of creating the groups at
design time and adding and removing them, try creating the groups at run
time based on the condition you show below. See the article below for
information on how to dynamically create a group. This way when you remove
a group, you can completely free the TppGroup object removing any chance of
the report breaking on the old group.

----------------------------------------------------
Tech Tip: Creating a Group in Code
----------------------------------------------------


How can I dynamically create a report group at run-time?


example code:
-------------

uses
ppClass, ppGroup, ppClasUt;


function AddGroupToReport(aBreakName: String; aDataPipeline:
TppDataPipeline; aReport: TppCustomReport);
var
lGroup: TppGroup;
lGroupBand: TppGroupBand;

begin


{add group to report}
lGroup := TppGroup(ppComponentCreate(aReport, TppGroup));

lGroup.Report := aReport;

lGroup.BreakName := aBreakName;
lGroup.DataPipeline := aDataPipeline;

{add group header and footer bands }
lGroupBand := TppGroupBand(ppComponentCreate(aReport,
TppGroupHeaderBand));
lGroupBand.Group := lGroup;

lGroupBand := TppGroupBand(ppComponentCreate(aReport,
TppGroupFooterBand));
lGroupBand.Group := lGroup;


end; {procedure, AddGroupToReport}

--
Regards,

Nico Cizik
Digital Metaphors
http://www.digital-metaphors.com