On Fri, 14 Dec 2012, Mattias Gaertner wrote:
On Fri, 14 Dec 2012 11:30:31 +0100 (CET)
[email protected] wrote:
On Fri, 14 Dec 2012, Jorge Gonçalves wrote:
>>
>> What does "Calculated" do?
>>>
>>
>> Judging from the Delphi code, it is no longer used. The GetCalculated
>> returns
>>
>>
> Yes i know.
> The problem surges when we read the dfm. The reader will give one exception
> that the property is unknown.
> If we try to remove the property from the file, Delphi will introduce them
> again, next time we edit the datamoudule.
You can install an unknown property event handler in TReader: OnPropertyNotFound
But that requires that you are able to choose which reader is used, because
now you cannot: I've long wanted to install a hook so you can select which
reader/writer is used in TStream.ReadComponent.
Maybe the lazarus implementation offers a hook ?
Maybe you mean in unit lresources.pp:
LRSObjectReaderClass: TLRSObjectReaderClass=TLRSObjectReader;
LRSObjectWriterClass: TLRSObjectWriterClass=TLRSObjectWriter;
Something like it, and also the hooks you posted in your other reply.
I think that the 2 variables you post above can be moved to the classes
unit: ObjectReaderClass and ObjectWriterClass. These should then be used in
the TStream.ReadComponent and TStream.WriteComponent.
That's what I meant with the 'install a hook'.
Once it is in place, the LCL can simply set these hooks, and remove any
custom hooks you made.
Michael.
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