Scholar.Notifier framework to handle update notifications between data layer and interface
- Notifier.registerColumnTree(ref) and Notifier.registerItemTree(ref) pass back a unique hash that can be used to unregister the tree later with unregister*(hash) (and must be, lest we leak treeViews and probably entire browser windows if the browser window is closed without unregistering the treeView)
- Data layer calls Scholar.Notify.trigger(event, type, id) after various events (only two calls in the data layer at the moment--more coming later)
- Notify.trigger() calls notify(event, type, id) on all registered trees of the appropriate type -- the data layer usually knows what collection the action pertains to, but we decided that it's cleaner to just let the tree decide what it wants to do rather than add all that logic into the data layer)
(Note: Item collection adds appear to be buggy on the interface side, but removes seem to be working)
Overhauled data access layer to support new model:
- Changed Item.getParent to Item.getCollections() to get ids of parent collections
- Removed Item.setPosition() -- item positions are set internally when items are added to and deleted from collections, but the orderIndex is not currently used or manipulatable externally
- Item constructor/Items.getNewItemByType()/Items.add() no longer take folderID and orderIndex as parameters
- Split getTreeRows() into Scholar.getCollections(parent) and Scholar.getItems(parent), which return root collections or all library items, respectively, if no parent given
- All references to folders in object/method/property names changed to collections
- New methods Collection.addItem(itemID), Collection.hasItem(itemID), Collection.removeItem(itemID)
- Collection.erase() takes optional deleteItems parameter to delete items from DB -- otherwise just removes association and leaves item in library (does, however, delete all descendent collections from DB regardless)
* Note: This will break displaying of items until interface code is updated. *
