[Dev] Unusual collections and items

[Donn Denman]

The current Drag and Drop infrastructure supports disallowing drops  
that don't make sense.  The Sidebar currently has the responsibility  
of deciding what to allow to be dropped onto each of its entries.  I  
imagine the Sidebar could examine kind-centric collections like  
Scripts and Certs and automatically restrict the allowable items for  
the drop.

On Sep 24, 2005, at 8:07 AM, John Anderson wrote:

> These are interesting problems which occur because our design  
> didn't consider the possibility of either the certificate store or  
> the scripts collection in the sidebar. Our current design chose to  
> focus on a limited set of scenarios. A more flexible design might  
> associate a viewer (CPIA tree of blocks) with a particular  
> collection, which would solve the display problems. The viewer  
> could allow/disallow stamping and other features by containing or  
> not containing the appropriate UI. Drag and Drop might best be  
> handled the collection itself. Both these design choices would be  
> relatively easy to implement given our current infrastructure.
>
> John
>
> Heikki Toivonen wrote:
>> We have some unusual collections, like Scripts and Certificate Store,
>> that behave somewhat differently than your typical collection of  
>> events,
>> tasks and so forth.
>>
>> This leads to interesting situations I am not sure how to solve,  
>> so some
>> design decisions are called for. Here are some examples.
>>
>> You have Certificate Store selected in the sidebar. Arguably you  
>> should
>> not be able to create/move non-certificates into this collection. I
>> don't  think we have any support for that (I am pretty sure you  
>> will get
>> exceptions raised if you try). And you need different type of  
>> feedback
>> to the user so that they won't even try or if they manage to try give
>> some useful feedback that it is not supported (create event from  
>> menu,
>> copy/paste, drag & drop, double click, ...).
>>
>> You have Scripts selected in the sidebar. You click on Calendar  
>> toolbar
>> button. Currently what happens is that the toolbar buttons seems  
>> to be
>> selected but you get an empty summary table view. While at first  
>> glance
>> it would seem it would be ok to disable the toolbar buttons that  
>> don't
>> make sense, this will lead to a situation where the user does not
>> understand why they can't switch to the calendar, for example.
>>
>> You can actually stamp a certificate to an event, for example. For  
>> some
>> reason this does not show up on the calendar - seems like a bug. At
>> first glance you might say it is stupid to stamp certificate and
>> stamping should be disabled for certs, but if you think of the case
>> where you are buying certificates (which expire yearly) you'd like to
>> have a calendar reminder to renew the certificate before it  
>> expires. And
>> come to think of scripts, why not make it possible to stamp  
>> scripts too
>> - a script event could run at the specified time etc.
>>
>>
>>
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