[Lazarus] TFPRreport vs TFPJSONReport
Michael Van Canneyt
michael at freepascal.org
Mon Mar 5 12:20:56 CET 2018
On Mon, 5 Mar 2018, patspiper wrote:
> TFPRreport and TFPJSONReport need some clarifications. Maybe MVC can
> confirm/correct the below:
> - Report design can be setup by code *only*.
Not correct. You can load from file. See WIKI, I added a section on that.
> - TFPReportData components must be linked to TFRReport by code
This is always so, but:
The IDE contains a menu item in the component editor that
links the available datasets to the report to make this easier.
See also below for improvements in runtime.
> - Can invoke the IDE integrated editor to design reports and open/save them
> from/to file. But they are useless to TFPRreport.
Not correct. You can load the design from file.
It doesn't happen 'out of the box' of course.
> - Report design can be setup by code.
> - Can load/save report designs from/to file/stream/json (discarding design
> data if any).
> - TFPReportData components have to be linked to TFPJSONReport by code (sample
> code is needed when the report is loaded from file)
> - Can invoke the IDE integrated editor to design reports that are
> loaded/saved from/to the lfm only.
They can also be loaded/saved to file, if you so desire.
> - The IDE integrated editor cannot open a report designed by the standalone
> designer, or save a file to be used by the standalone designer. Note:
> Actually it can currently open a file, but possibly with nasty side effects.
It should definitely be able to open it. What happens with the data,
this is up for discussion. Currently I am toying with the idea that the
IDE offers to add the missing data definitions to the form.
I want to refactor the data handling a little so it can be used outside the
designer - as you noticed, when loading a design from file, the data
definitions are discarded. Then the loading in IDE can be improved...
Please look at the WIKI, http://wiki.freepascal.org/FPReport, I added some
explanations. I will add the 'Lazarus support' page after lunch.
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