Richard Gaskin wrote:
That's prettyt much where I'm headed now, but there's one aspect that's still problematic: Rev's built-in undo for text editing operations is something I don't want to replicate. For a single-level Undo it's easy enough to put a flag in the undo string to tell it to use the built-in undo command rather than any custom routine. But how would one handle this for multi-level undo?
Richard, I'm sure you've already thought of this, but why not create a number of customProps in a customPropSet:
fwUndo["fred",1] fwUndo["fred",2] etc..
where 'fred' refers to a field name and the number refers to the last change made.
Then each time a close field is sent to the "fred" fld, store the htmlText of the field in the appropriate customProp. Then it's a simple matter to find the highest number and 'undo' to the htmlText of it.
StripAndShip will kill the whole property set.
I'm sure you already thought of this, but thought I'd mention it anyway.
In general I like it, but I've gone the route of stashing undo commands instead of properties. That way the undo script doesn't need to parse the properties to figure out what action to take, making the undo script smaller and opening up more flexibility fort someone as lazy as myself. :)
Another tricky aspect is one that Ken reminded me of on the phone the other day: undo needs to be window-aware. So if you do something in one window and move another to the front, choosing Edit-Undo shouldn't undo the thing in the window that no longer has focus.
Currently I'm only doing one-level undo, using an array with the stack name as the key. That way I can clear the entire array at once when Undo is used, and until then I maintain undo code for each stack's last action.
-- Richard Gaskin Fourth World Media Corporation ___________________________________________________________ [EMAIL PROTECTED] http://www.FourthWorld.com _______________________________________________ use-revolution mailing list use-revolution@lists.runrev.com http://lists.runrev.com/mailman/listinfo/use-revolution
