[Lazarus] Embedding a standard dialogue

[Mark Morgan Lloyd]

Antonio Fortuny wrote:
> Le 18/04/2012 09:42, Mark Morgan Lloyd a écrit :
>> Apologies for my lousy threading here, a message got chopped by our 
>> firewall.
>>
>> > > Is it possible to embed a standard dialogue in a custom form? For
>> > > example, if I wanted to filter text input through a user-specified
>> > > regular expression, can I set up a form containing a file-open
>> > > dialog plus an edit box for the regex, or do I have to implement
>> > > it from scratch?
>> >
>> > No, you must create your own dialog from scratch.
>> >
>> > Juha
>>
>> OK, If I can lead on from this. The cause of bug 21792 that I raised 
>> yesterday is, I'm told, that I'd set the main form visible but 
>> minimised. The reason I'd done this is that before the form was 
>> displayed I wanted the user to provide database login credentials, I 
>> couldn't rely on a standard dialogue for that since I also needed to 
>> have him select what kind of database- PostgreSQL or Firefox- as well 
>> as the server and possibly port.
>>
>> What is the correct thing to do in this sort of situation? I've seen a 
>> description of a hack for Delphi which relied on creating the main 
>> form manually, should something like that be attempted for Lazarus?
>>
>> Or should I simply redo the app so that the login is the main form?
>>
> For such cases I build a DataModule whith auto creation.
> In the DataModule OnCreate event code I create and display a modal 
> little window asking for credentials. Depending on user's answers I 
> cancel the program. Make sure the login form is NOT auto crated.
> If credentials are OK, processing continues as usual and the main form 
> is created and displayed.
> The only thing to take care of is to make sure that the creation of the 
> DataModule is done BEFORE the main form in the project code (.dpr or .lpr)
> Because the DataModule is never displayed, that's it.

Thanks, will follow up.

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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