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Windows Image Acquisition (WIA) is an API built into Windows that provides a standard mechanism for acquiring digital images from devices connected to your computer. These devices could be digital cameras that store captured images, or scanners that can scan digital images of documents. WIA exposes a COM Automation API and consequently is well suited for COM Interop-based access from within Silverlight. To ease its use from within our application and to facilitate property binding, you wrap the necessary parts of the WIA object model to create a strongly typed version. This wrapper code is found in a file named wiaom.cs in the sample project for this recipe. We describe parts of it here to illustrate the COM Interop aspects, but encourage you to look through the WIA Automation API at msdn.microsoft.com/en-us/library/ms630827(VS.85).aspx as well the code in wiaom.cs for more details on the wrapping approach. The top level object in the WIA API is called the DeviceManager, and you wrap it in a CLR type named WIADeviceManager. Listing 8-10 shows the WIADeviceManager class and a few related classes in our wrapper object model. Listing 8-10. WIA wrappers public class WIAObject : INotifyPropertyChanged { //hold the COM native object protected dynamic WIASource { get; private set; } // public WIAObject(dynamic Source) { WIASource = Source; Validate(); } //validate the COM object protected virtual void Validate() { if (WIASource == null) throw new ArgumentNullException("Null source"); } #region INotifyPropertyChanged Members protected void RaisePropertyChanged(string PropName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(PropName)); } public event PropertyChangedEventHandler PropertyChanged; #endregion }

<grid> <columns> <column width="250px"/> <column/> </columns> <rows> <row spans="2"> <div align="center"> <label style="font-weight:bold;" value="Information about your pet"/> </div> </row> <row>Category: <listbox id="products" mold="select" rows="1"/> </row> <row>*Pet's name: <textbox id="petName"/> </row> <row>*Description(3 lines max): <fckeditor id="description" customConfigurationsPath="/seller.js" toolbarSet="seller" height="100px"> </fckeditor> </row> <row>*Price(In US dollars): <decimalbox id="price" format="$#,##0.00"/> </row> <row> <hbox>*Image File: <button id="image" label="upload" onClick="win.upload()"/> </hbox> <image id="picture" width="100px" height="77px"/> </row> </rows> </grid>

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When you initially create a Popup instance, it is located at the top-left corner of the Page at coordinates (0,0) which is shown by the dotted outline of the Popup in Figure 5-17. Let s assume you need to align the Popup to the bottom-left corner of an element in the Page named AnchorElement, which has Width set to w and Height set to h ; its top-left coordinates are (x,y) relative to the Page, as shown in Figure 5-17. If you defined the Popup s desired coordinates with respect to the AnchorElement s coordinate space alone, they would be (0,h). However, since you are going to position the Popup within the Page, you need to translate (0,h) in AnchorElement s coordinate space (the source coordinate space) to a suitable set of coordinates in the Page s coordinate space (the target coordinate space). Those would be (x,y + h) for it to be positioned at the desired spot, which means that the Popup needs to be offset by x horizontally and by y + h vertically from its original position of (0,0) within the Page to reach its new position. The following code shows how to achieve this: GeneralTransform coordTnsfrm = this.TransformToVisual(AnchorElement); Point pt = coordTnsfrm.Transform(new Point(0.0, AnchorElement.ActualHeight)); popupProducts.HorizontalOffset = pt.X; popupProducts.VerticalOffset = pt.Y;

Here you invoke TransformToVisual() on an UIElement that owns the target coordinate space and pass in another UIElement whose coordinate space acts as the source. The GeneralTransform that is returned from the call to TransformToVisual() can then be used to transform a Point defined in the source space to one in the target space. You also transform a Point in AnchorElement s coordinate space with X set to 0 and Y set to the height of AnchorElement (i.e., the bottom-left corner of AnchorElement) to the appropriate equivalent in the Page s coordinate space. You then use the X,Y values of the resulting Point to set the HorizontalOffset and the VerticalOffset values on the Popup to position it as you intended on the page.

In initializing a Popup in code with content that is, setting its Child property you should avoid creating and initializing the entire content in code, especially if the content represents a fairly complex UI. You almost always want to take advantage of tools like Expression Blend to do that. In the following code sample, you simply need a single ListBox to be the only child of the Popup. Therefore, you are not burdened with creating an overly complex UI in code. However, if you are ever faced with this challenge elsewhere and want to avoid the need to code an UI tree, you can use the ContentControl and data templates shown here: Popup popupProducts = new Popup(); ContentControl popupContent = new ContentControl(); popupContent.ContentTemplate = this.Resources["dtPopupData"] as DataTemplate; popupProducts.Child = popupContent; popupContent.DataContext = ProdList; Set the ContentTemplate of the ContentControl to a data template resource, initialize Popup.Child with the ContentControl, and then bind the ContentControl to appropriate data. This gives you the opportunity to host a fairly complex UI in a Popup but design it as a data template using a tool like Expression Blend, thus expressing it as XAML and keeping your code free of significant element creation and initialization logic.

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