EXTENDING USER EXPERIENCE OF LOB APPLICATIONS in VB.NET

Printer QR Code in VB.NET EXTENDING USER EXPERIENCE OF LOB APPLICATIONS

CHAPTER 7 EXTENDING USER EXPERIENCE OF LOB APPLICATIONS
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Silverlight 4 brings the Silverlight version of the XAML parser one step closer to the regular WPF parser. We will take a look at key enhancements before ending this chapter.
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Drag-and-Drop Functionality
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Drag-and-drop functionality is always a favorite feature for developers to implement and it also brings a great end-user experience. Silverlight 4 allows Silverlight UIElements as a drop target and thus enables the implementation of the drag-and-drop functionality for partially trusted in-browser and out-ofbrowser (OOB) applications, as well as elevated-trusted OOB applications. We already looked at a brief example of drag-and-drop functionality in 1, and we learned about key property and events of UIElement, enabling drag-and-drop functionality, in 3. Let s revisit the properties and events of UIElement that are required to enable the drag-and-drop functionality.
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Properties of UIElement to Enable Drag-and-Drop Functionality
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The System.Windows.UIElement class contains two properties AllowDrop and Visibility that need to be enabled for the user control to make it a drop target. The AllowDrop dependency property is the key property to enable drag-and-drop functionality, which is introduced in Silverlight 4. Set it to true if you want to allow that specific UIElement to be a drop target. The default value of AllowDrop property is false. Along with the AllowDrop property setting of true, the Visibility property of that specific UIElement must be set to Visibility.Visible, to make the control visible and allow it to be a drop target. Note that Visibility.Visible is the default value of the UIElement, so you do not need to explicitly mention that.
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Events of UIElement to Enable Drag-and-Drop Functionality
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The System.Windows.UIElement class contains four new events DragEnter, DragLeave, DragOver, and Drop in Silverlight 4 that can be implemented to enable drag-and-drop functionality. The AllowDrop property must be set to true in order to raise these events. If you set the AllowDrop property to false, even if these events are implemented, they will not be raised. Table 7-1 details these properties of the System.Windows.UIElement class. Table 7-1. Events of the System.Windows.UIElement Class
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Event
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DragEnter
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Description
Fires when the input system reports an underlying drag event with the specific event as the target. The event occurs only if the AllowDrop property of that element is set to true. Event args class: DragEventHandler. New event in Silverlight 4. Fires when the input system reports an underlying drag event with the specific event as the origin. The event occurs only if the AllowDrop property of that element is set to true. Event args class: DragEventHandler. New event in Silverlight 4.
DragLeave
CHAPTER 7 EXTENDING USER EXPERIENCE OF LOB APPLICATIONS
DragOver
Fires when the input system reports an underlying drag event with the specific event as the potential drop target. The event occurs only if the AllowDrop property of that element is set to true. Event args class: DragEventHandler. New event in Silverlight 4. Fires when the input system reports an underlying drag event with the specific event as the drop target. The event occurs only if the AllowDrop property of that element is set to true. The Drop event is a bubbling event allowing multiple Drop events received by each object in a parent-child relationship in the object tree. Event args class: DragEventHandler. New event in Silverlight 4.
Drop
Processing Dropped File(s)
Silverlight 4 s drag-and-drop feature supports only the processing of the dropped (one or more) files. The data object containing the dropped file(s) is accessible through the DragEventArgs.Data value from the drag-and-drop event. It implements the IDataObject, which provides a general interface for transferring data. For Silverlight, the only supported data object is of DataFormat.FileDrop format. You use the DataObject.GetData(DataFormat.FileDrop) method to retrieve the dropped file(s). Depending on the number files selected and dropped, it will return a FileInfo type array containing a one-item data set (for a single dropped file) or a multi-item data set (for more than one dropped file). You use the FileInfo.OpenRead or FileInfo.OpenText methods to access the file content. Only the Drop event provides a dropped data object through the DragEventArgs.Data that can be processed to access the content of the file(s). DragEnter, DragLeave, and DragOver events also use the DragEventArgs with the DragEventArgs.Data value as null, which will cause the SecurityException if you try to attempt accessing data using the IDataObject APIs.
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