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The abstract class CustomItem allows applications to create new visual and interactive elements that can be used in Forms To do this, a new subclass of CustomItem is created: it is responsible for creating the visual representation for the Item, including sizing and rendering The subclass fully controls what is presented within item area It defines the colors, fonts, and graphics that are used, including rendering of special highlight and focus states the item may have Only the label of the item is rendered by the device, but the label is always rendered outside the CustomItem content area A CustomItem can trigger notifications to the ItemStateListener of a Form in which the CustomItem is contained This is done by calling the notifyStateChanged method inherited from Item

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Like all Items, CustomItems have the concept of minimum and preferred sizes These sizes pertain to the total area of the Item, which includes space for the content, label, borders, and so forth (See Section 1094, "Item Sizing," for a full discussion of the areas and sizes of Items) A CustomItem does not itself fully control this area There is, however, a smaller region within the CustomItem called the content area that the CustomItem subclass paints and from which it receives input events

The Shell object must be explicitly created and assigned to a variable, just like the Network object In this section, I'll assume that your scripts already contain the following code

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When you create views, your goal is to display the entity to the end user in a way that makes sense based on the user s requirements This might mean joining several tables to provide your output, or it might mean querying a single table but not displaying all the rows A view that returns all the information about a customer is great, but if you also join to the address table, you could receive multiple addresses for that customer and hence receive multiple rows in your view per customer This isn t necessarily a problem, but the consumers of the view need to understand what they are receiving Also, it s a good idea to create views that shortcut application logic In other words, if the application often pulls a list of all the past orders of a customer to output an account summary page, then a view that joins the customer table to the order table might save time and prevent the application from making two trips to the database and then combining the record sets locally Also, avoid using SELECT * syntax or INSERT syntax without a list of values In fact, avoid may be the wrong term; just don t use this syntax Doing so creates problems and reduces the usefulness of your abstraction layer if changes are made Either form of this syntax relies on the data being in a particular order When the application performs a SELECT *, it might be expecting 15 columns of specific data If you now add a new column before column 5, the application will still get 16 columns, but beginning at column 5 the data will be different from last time This kind of unexpected result can trigger a simple problem such as data being labeled incorrectly, or it can create bigger problems, such as application crashes due to incorrect data types, divide by zero errors, item not found in collection errors, and the list goes on If you select data by column name, the worst the application will do is ignore the new column until you modify the view definition Let s look at the views we will need to view our customer data Remember that the customer entity is made up of both tbl_customer and tbl_address, so we must decide how to return this data In this case, we will use two views: one for all the customer information except for address data, and the other for address detail Had we decided to use only one view, we would end up repeating all the customer data for each address in the database Although this isn t really a problem, it is often easier to reduce the duplication in the view rather than rely on the application to take care of it For view 1, we use the code shown next.