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Everything has so far laid the groundwork for the n-level undo functionality. All the pieces now exist to make it possible to implement the CopyState(), UndoChanges(), and AcceptChanges() methods, and then the BeginEdit(), CancelEdit() and ApplyEdit() methods. The CopyState() method needs to take a snapshot of the collection s current state. It is invoked when the BeginEdit() method is called on the root object (either the collection itself or the collection s parent object). At that time, the root object takes a snapshot of its own state and calls CopyState() on any child objects or collections so they can take snapshots of their states as well:
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void Core.IUndoableObject.CopyState( int parentEditLevel, bool parentBindingEdit) { if (!parentBindingEdit) CopyState(parentEditLevel); } private void CopyState(int parentEditLevel) { if (this.EditLevel + 1 > parentEditLevel) throw new Core.UndoException( string.Format(Resources.EditLevelMismatchException, "CopyState")); // we are going a level deeper in editing _editLevel += 1; // cascade the call to all child objects foreach (C child in this) child.CopyState(_editLevel, false); // cascade the call to all deleted child objects foreach (C child in DeletedList) child.CopyState(_editLevel, false); } There are technically two CopyState() methods one for the Csla.Core.IUndoableObject interface and the other a private implementation for use within BusinessListBase itself. The interface implementation merely delegates to the private implementation. As CopyState() takes a snapshot of the collection s state, it increases the edit level by one. Remember that UndoableBase relies on the Stack object to track the edit level, but this code just uses a simple numeric counter. A collection has no state of its own, so there s nothing to add to a stack of states. Instead, a collection is only responsible for ensuring that all the objects it contains take snapshots of their states. All it needs to do is keep track of how many times CopyState() has been called, so the collection can properly implement the adding and removing of child objects, as described earlier. Notice that the CopyState() call is also cascaded to the objects in DeletedList. This is important because those objects might at some point get restored as active objects in the collection. Even though they re not active at the moment (because they re marked for deletion), they need to be treated the same as regular nondeleted objects. Overall, this process is fairly straightforward: the CopyState() call is just cascaded down to the child objects. The same can t be said for UndoChanges() or AcceptChanges().
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The UndoChanges() method is more complex than the CopyState() method. It too cascades the call down to the child objects, deleted or not, but it also needs to find any objects added since the latest snapshot. Those objects must be removed from the collection and discarded because an undo operation means that it must be as though they were never added. Furthermore, it needs to find any objects deleted since the latest snapshot. Those objects must be re-added to the collection. Here s the complete method:
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void Core.IUndoableObject.UndoChanges( int parentEditLevel, bool parentBindingEdit) { if (!parentBindingEdit) UndoChanges(parentEditLevel); } private bool _completelyRemoveChild; private void UndoChanges(int parentEditLevel) { C child; if (this.EditLevel - 1 < parentEditLevel) throw new Core.UndoException( string.Format(Resources.EditLevelMismatchException, "UndoChanges")); // we are coming up one edit level _editLevel -= 1; if (_editLevel < 0) _editLevel = 0; bool oldRLCE = this.RaiseListChangedEvents; this.RaiseListChangedEvents = false; try { // Cancel edit on all current items for (int index = Count - 1; index >= 0; index--) { child = this[index]; DeferredLoadIndexIfNotLoaded(); _indexSet.RemoveItem(child); child.UndoChanges(_editLevel, false); _indexSet.InsertItem(child); // if item is below its point of addition, remove if (child.EditLevelAdded > _editLevel) { bool oldAllowRemove = this.AllowRemove; try { this.AllowRemove = true; _completelyRemoveChild = true; RemoveIndexItem(child); RemoveAt(index); }
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