Re: [OpenMap Users] OpenMap 4.6 changes [layer no-delete]

Wouldn't it be better for the layer handler to toss up an exception so
that applications can catch and handle the problem?

Then it would be up to the LayersPanel to toss up the message.

I'd probably create an OMException class which extends Exception so that
app code can catch (OMException ome) and handle them separately from other
exceptions.

I'm happy to stick this into my work queue but it will probably be a
couple of weeks before it will comes up to the top.

regards,

Adrian

_____________________________________________

Adrian Lumsden
Product Specialist
Scientific Software and Systems Limited

Tel: +64 4 917-6680 (direct)
        +64 4 917-6670 (reception)
Fax: +64 4 917-6671
E-mail: Adrian.Lumsden@sss.co.nz

Visit us on the Web at: http://www.sss.co.nz
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Don Dietrick <dietrick@bbn.com>
30/07/03 10:27

 
        To: Adrian Lumsden <Adrian.Lumsden@sss.co.nz>
        cc: Piotr Kamiński <Piotr.Kaminski@ctm.gdynia.pl>, openmap-users@bbn.com,
owner-openmap-users@bbn.com
        Subject: Re: [OpenMap Users] OpenMap 4.6 changes [layer no-delete]

The LayerHandler is usually responsible for deleting layers, so it
could check the layer for that property. It should toss up an
information window notifying the user that the layer can't be deleted
if it receives a command to delete a marked layer.

The LayersPanel delete button should disable itself if the selected
layer is not supposed to be deleted.

- Don

On Tuesday, July 29, 2003, at 05:28 PM, Adrian Lumsden wrote:

>
> Hello,
>
> I too would like to have the ability to mark a layer as being
> undeletable. I was going to do this by setting a flag in my layers
> (which extend the OM layers) and not using the OM layer management
> tools.
>
> I haven't had a look at the code but I don't suppose it would be too
> difficult to implement the no-delete property. I think the major
> amount of work would be in deciding what the GUI tools should do. Do
> they disable the delete option when an undeletable layer is selected;
> do they allow the delete button to be pressed and generate an error or
> do they just silently ignore the request?
>
> I'm going to have to resolve the issue soon'ish so I'm prepared to do
> some work on the code if there's a consensus on the way to go.
>
> regards,
>
> Adrian
> _____________________________________________
>
> Adrian Lumsden
> Product Specialist
> Scientific Software and Systems Limited
>
> Tel:        +64 4 917-6680 (direct)
>        +64 4 917-6670 (reception)
> Fax:        +64 4 917-6671
> E-mail:        Adrian.Lumsden@sss.co.nz
>
> Visit us on the Web at:  http://www.sss.co.nz
> _____________________________________________
>
> This e-mail passed SSS's content security scan.
> It is covered by the confidentiality clauses at
> http://www.sss.co.nz/content_and_confidentiality
>
>
>
>
<image.tiff>
>
>
>
>
> Hi,
>
> [...SNIP...]
>
> I have a problem in my application. A few layer must not be removed
> by user. How to stop user from deleting layer? Doas layer has any
> property 'removable' or something? If not I'd like to add such
> feature to Layer class and hadle it in LayersPanel. Maybe I should
> go another way?
>
> Regards,
> Piotr Kaminski
>
>

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