On 15-Mar-2002 Asger K. Alstrup Nielsen wrote:
> On Fri, 15 Mar 2002, Andre Poenitz wrote:
>
>> How does the undo architecture look like? Maybe even one that does not
>> work on the outer paragraph level only, but on smaller scopes if possible?
>
> Conceptually, you can handle undo by having a stack of documents.
>
> Now, you want smaller scope. I presume this is because you want local
> undo. (You can still do this, just with stacks of paragraphs, but
> ignore that for now.)
I don't understand the whole discussion. We HAVE local undo! The only thing
you have to do is encapsulate your undo data in a paragraph and then pass
this paragraph data to undo. What we are missing is undo on an abstract
data type. That means we should give the undo function a "void *" pointer
with the ALREADY duplicated data, with a datatype to specify where undo
should resend the data in a undo/redo event.
IMO this shouldn't be too hard to realize.
Jug
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