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if (!_initiatedLocally) OnListChanged( new ListChangedEventArgs( ListChangedType.ItemAdded, SortedIndex(e.NewIndex))); } else DoSort(); break; The hard work occurs if the new item was added to the end of the original collection. In that case, the item s key property value is retrieved based on the value of _sortBy; just like in the DoSort() method. Then a new ListItem object is created and inserted into the list at the end for an ascending sort, and at the beginning for a descending sort. This ensures that the new item appears at the very bottom of a grid or list control when the sorted view is a data source for such a UI control. Finally, if the addition of the new item was not initiated locally, then a ListChanged event is raised to tell the UI about the new item. This is important, because if the new item was added locally to the view, then no ListChanged event should be raised at this point; instead, the event is raised by the local AddNew() method itself.

We re going to do some detail editing of the Home Sync preferences, so doubleclick the Home Sync entry. The details editor should look like the one shown in Figure 12-16. NOTE: The gray circle with a white mouse pointer is an indication that there are some preferences already defined for that category. These were defined when we used the Preferences Overview Mobility editor.

/* Delete the file using MySQL's delete file method */ my_delete(data_from, MYF(0)); my_delete(index_from, MYF(0)); DBUG_RETURN(0); } Wow! That was a lot of changes As you can see, supporting indexes has made the code much more complicated I hope you now have a better appreciation for just how well the existing storage engines in MySQL are built Now, let s move on to making the changes to the indexing methods There are six methods that must be implemented to complete the indexing mechanism for a stage 5 storage engine Take note as you go through these methods that some return a row from the data file based on the index passed in whereas others return a key The documentation isn t clear about this, and the name of the parameter doesn t give us much of a clue, but I ll show you how they are used.

When an item is removed from the original collection, a ListChanged event is raised. SortedBinding List handles this event. If the removal was initiated by the original collection, then the view is simply re-sorted: case ListChangedType.ItemDeleted: if (!_initiatedLocally) DoSort(); break; This is the easiest approach, since it causes automatic removal of the ListItem object corresponding to the removed item, and recalculation of all the cross-reference index values between the sorted list and the original collection. Notice that if the removal was initiated by the view itself, then the view isn t re-sorted. This is because the RemoveAt() method in SortedBindingList removes both the original item and the corresponding ListItem object and recalculates all the cross-reference index values. By using a combination of delegation to the original collection and implementation of a cross-reference scheme between the sorted list and the original list, SortedBindingList provides a bidirectionally updatable, sorted view of any IList<T> array or collection.

One common view of good UI design holds that the user should be free to enter arbitrary text, and it is up to the application to make sense of the entry. Nowhere is this truer than with date values, and the SmartDate type is designed to simplify how a business developer uses dates and exposes them to the UI. Examples of free-form date entry are easy to find. Just look at widely used applications like Microsoft Money or Intuit s Quicken. In these applications, users are free to enter dates in whatever format is easiest for them. Additionally, various shortcuts are supported; for example, the + character means tomorrow, while means yesterday.

These methods must return either a key not found or end-of-file return code Take care to code these return statements correctly or you could encounter some strange query results The first method is the index_read() method This method sets the row buffer to the row in the file that matches the key passed in If the key passed in is null, then the method should return the first key value in the file Locate the index_read() method and add the code to get the file position from the index and read the corresponding row from the data file Listing 7-49 shows the method with the changes Listing 7-49 Changes to the index_read() Method in ha_spartan.