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Also note in Listing 5-10 the use of a value converter of type ColorNameToBrushConverter. Since the Border.Background property is of type SolidColorBrush and Product.Color is a string literal, you need to facilitate an appropriate value conversion. Listing 5-11 shows the value converter code as well in the ColorNameToBrushConverter class. See 4 for more details on a value converter. In both the conversion functions in the value converter implementation, you use reflection to enumerate the list of static properties of type Color defined on the type System.Windows.Media.Colors, each of which are named for the Color they represent. In Convert(), while trying to convert a Color name string to a SolidColorBrush, you find the matching Color property in the enumerated list of properties and use that to create and return the brush. In ConvertBack(), while trying to convert a SolidColorBrush to a color name string, you find the property with a Color value matching the SolidColorBrush.Color and use the property name as the color name string. If no matches are found or if exceptions occur, it falls back to Colors.Transparent as the default value.

You want to create a custom column type for a DataGrid to enable specific functionality to handle a particular data type or data item.

Extend the DataGridBoundColumn class, and add functionality to handle the view and edit modes for the intended data type or data item.

The framework ships with a few prebuilt DataGrid column types for handling some of the standard data types. DataGridTextColumn is one of the most useful ones and can be used to view and edit any data that can be converted to a meaningful text representation. DataGridCheckBoxColumn is another one that can

If you prefer to separate code from views, you could put the Java code in a separate file, like sayHello.zs as shown in Listing 4-10. Then, you use the src attribute of the zscript to reference it, as shown in Listing 4-11.

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be used to view and edit a Boolean value as a CheckBox and with the current value mapped to its checked state. In some situations, you want to implement custom logic to handle a specific data type or a program data item bound to a DataGrid column. One way to achieve that is through the use of the DataGridTemplateColumn column type and the use of CellTemplate and CellEditingTemplate, as shown in Recipe 5-6. Yet another way is to create a new column type that encapsulates the custom logic, much like the ones that the framework ships with. The logic encapsulation in creating this custom column offers you the advantage of not having to rely on the consumers (UI layer developers) of your data to supply appropriate data templates, as well as the ability to standardize and lock down how a specific data type or item gets treated inside a DataGrid. In this second approach, you start by creating a new class extending the System.Windows.Controls.DataGridBoundColumn class in the System.Windows.Controls.Data assembly, which is also the base class for the framework-provided column types mentioned earlier. The DataGridBoundColumn exposes an API of abstract methods that allows you to easily control the UI and data-binding logic of cells in the custom column as they are switched between view and edit modes. The methods in this API that you will override most often are GenerateElement(), GenerateEditingElement(), PrepareCellForEdit(), and CancelCellEdit(). All of these methods, except CancelCellEdit(), are abstract methods; therefore it is mandatory that you provide an appropriate implementation in your custom column code.

There could be a number of reasons why you may want to get access to the raw audio and video samples produced by a webcam. Some application scenarios include: Recording An application that needs to record a webcam session into some sort of media file format that can be replayed later Audio/Video Communication An application such as an instant messaging client that enables remote audio/video communication, where the captured samples from a webcam needs to be transferred over the network to be viewed remotely.

Silverlight 4 allows you to capture raw webcam audio/video samples using two types in the System.Windows.Media namespace namely VideoSink and AudioSink.

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