Custom Band

rbuser

Hi,

What are the steps required to register a custom band that inherits from
TppSummaryBand.

Thanks

nardmoseley

The architecture is open to adding custom RCL components that appear on the
Designer's component palette. For a simple example, check out
RBuilder\Demos\RCL.

Try to accomplish what you need by making a custom component, rather than a
band. A component that descends from TppStretchable can dynamically stretch
its height and overflow to additional pages - therefore it is much like a
band. Descendants of Stretchable include Memo, RichText, Region, Subreport,
and Crosstab. For an example check out RBuilder\Source\ppMemo.pas

The architecture is currently /not/ designed to accomodate adding custom
bands.


--
Nard Moseley
Digital Metaphors
www.digital-metaphors.com

rbuser

Thanks.

I was trying to implement the Summary Align Bottom example by creating my
own descendent from TppSummaryBand, rather than adding all the code in every
report. In the end I created a RAP procedure that we call from the
SummaryBeforePrint event and the called code assigns the OnDrawCommandCreate
event as well as the AfterPrint event to the Summary components.

How could I use this approach to force the summary band contained in a
subReport to force that summary band to print at bottom of page.

nardmoseley

Thanks for the details, now I understand better, you really are trying to
change the behavior of the summary band.

- one option would be to use the Report.Template.OnLoad event to assign the
SummaryBand.BeforePrint and AfterPrint event-handlers etc and manage things
from there. Sort of like a common set of event-handlers to manage
everything.

- the next step up from that would be to create a SummaryBandController
component that has a SummaryBand property. You set the property and assigns
the event-handlers and manages things. (Same as above, but the code is
encapsolated in the SummaryBandController class so its cleaner.

- another option would be to try creating SummaryBandController that works
similar to the TppPageBreak, which does not itself generate any output. Your
custom component could be placed in the summary band and attach the
event-handlers and manage things that way.

--
Nard Moseley
Digital Metaphors
www.digital-metaphors.com