Adding Client-Side Behavior Using the ExtenderControl in Visual Studio .NET

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Adding Client-Side Behavior Using the ExtenderControl
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As you approach the development of an extender control, you need to consider the experience consumers of your control will have as they develop The control should be easy to con gure and should cleanly integrate with the behavior class that will provide the client-side functionality The ImageRotator extender contains two main properties, Rotation Interval and ImageList These provide con guration points for the control The ImageRotator property determines the interval in seconds that the images in the Image control will be swapped out, and the ImageList property contains the images used during the swapping process When creating properties, remember that the properties will be accessible in the Properties window during design time, so special attention should be paid to the data types used to ensure their compatibility with the Properties window The SystemComponentModel and SystemComponentModelDesigner namespaces can come in handy when working with some data types, providing attributes and designers that can be applied to a property and thus ensuring a richer design-time experience for users of the extender control An example of a ComponentModel attribute is the DefaultValue attribute used on the RotationInterval property to inform the designer that the default value of 3 should be used The use of defaults can help ensure that the default implementation of your extender control has a desirable effect for users who might want an attach-and-run experience The information gathered from the properties is used by the GetScript Descriptors method and the ScriptBehaviorDescriptor class that is created inside it The ScriptBehaviorDescriptor class contains all the elements needed to compose the $create statement used to initialize the behavior class for the extender control The class contains the name of the behavior class, the control id of the attached control, and a collection of property assignments for the RotationInterval and ImageList values that were collected by the extender control As the page is processing, the Script Manager control looks for child controls that implement the IExtender Control interface and calls the GetScriptDescriptors method on them, extracting out the $create statement that the descriptor contains and embedding it onto the page This ability to assign property values on an extender control and have them participate in the client experience is what makes extender controls so appealing
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The GetScriptReference method creates a ScriptReference class designed to register the script le for use on an ASPNET page The class takes the full name of the client behavior le and the full name of the assembly and uses this information to register the script le Because the Extender Control implements the IExtenderControl interface, the ScriptManager calls the GetScriptReferences method and adds the ScriptReference class to the ScriptReferenceCollection so that it is included on the page
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Listing 511 ImageRotator ExtenderControl-Based Class
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[TargetControlType(typeof(Image))] public class ImageRotator : ExtenderControl { public ImageRotator(){ } int _rotationInterval = 0; [DefaultValue(3), DisplayName("RotationInterval(seconds))")] public int RotationInterval { get { if (_rotationInterval == 0) { //set the default _rotationInterval = 3; return _rotationInterval; } else { return _rotationInterval; } } set { _rotationInterval = value; } } public string ImageList { get; set; } private string CreateImageListArray() { string[] imageList = ImageListSplit(','); if (imageListLength == 0) return ""; StringBuilder arrayList = new StringBuilder();
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Adding Client-Side Behavior Using the ExtenderControl
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bool first = true; arrayListAppend("new Array("); foreach (string value in imageList) { if (first) { first = false; } else { arrayListAppend(","); } arrayListAppend("'"); arrayListAppend(value); arrayListAppend("'"); } arrayListAppend(")"); return arrayListToString(); } protected override IEnumerable<ScriptDescriptor> GetScriptDescriptors(SystemWebUIControl targetControl) { ScriptBehaviorDescriptor descriptor = new ScriptBehaviorDescriptor( "ImageRotatorExtenderImageRotator", targetControlClientID); descriptorAddProperty("rotationInterval", RotationInterval); if (!stringIsNullOrEmpty(ImageList)) { descriptorAddProperty("imageList",ImageListSplit(',')); } yield return descriptor; } // Generate the script reference protected override IEnumerable<ScriptReference> GetScriptReferences() { yield return new ScriptReference( "ImageRotatorExtenderImageRotatorjs", thisGetType()AssemblyFullName); } }
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Creating the SysUIBehavior Class
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The client behavior of the extender control is represented by the SysUIBehavior-based ImageRotator class shown in Listing 512 This
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