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11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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Listing 1114 AnimationImageExtender Declarative Syntax
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<asp:Image ID="BannerImage" runat="server" ImageUrl="~/images/1jpg" /> <cc3:ImageAnimationExtender ID="Banner_ImageAnimationExtender" runat="server" Enabled="True" TargetControlID="BannerImage"> <Animations> <OnLoad> <Sequence> <FadeIn AnimationTarget="BannerImage" Duration="3"/> </Sequence> </OnLoad> </Animations> </cc3:ImageAnimationExtender> <cc2:ImageRotatorExtender ID="Image1_ImageRotatorExtender" runat="server" Enabled="True" TargetControlID="Banner"> <cc2:ImageUrl Url="~/images/2jpg" /> <cc2:ImageUrl Url="~/images/3jpg" /> <cc2:ImageUrl Url="~/images/4jpg" /> </cc2:ImageRotatorExtender>
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Providing Declarative Support in Your Extender Class
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The AnimationExtenderControlBase class provides most of the functionality we need to parse the Animation tag and all its contents This class provides internal methods that convert the XML representation of the animation into JSON format, which our behavior will then use to run the animation, and also provides the Animation property that we see in Listing 1115 The following sections cover the steps needed to ensure the extender will work correctly 1 Add attributes to the class 2 Create a property for the event 3 Add attributes to the property
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Add Attributes to the Class
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This type of extender has a couple of added class attribute entries of interest to us The rst is the inclusion of the RequiredScript attribute for the AnimationExtender type The AnimationExtender class provides a lot of the client-side functionality we will be using in our extender control, and by using this type in our RequiredScripts attribute, we are guaranteed that
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the scripts will be present on the client for us to use The second attribute is the SystemWebUIDesignToolboxItem attribute, which enables our control to show up in the toolbox of Visual Studio It might seem strange that we have to add this because all our other extenders didn t If we look at the attributes on the AnimationExtenderControlBase class, however, the support for viewing in the toolbox has been turned off Therefore, we must reset this value on our control so that it will show up in the toolbox
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Create a Property for the Event
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The pattern when creating extenders of this type is to add a property for each event you want to interact with In our case, we are working with the OnLoad event, so we create a property named OnLoad (to make it easy to understand what the event is) If we were to choose other events, we would name them based on the DOM event they represent The property accessor for these events must use the GetAnimation and SetAnimation methods to ensure proper data conversion into JSON as the data is stored and retrieved out of the extender s view state
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Add Attributes to the Event Property
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The event property must have the Browsable, DefaultValue, Extender ControlProperty, and DesignerSerializationVisibility attributes applied to it The Browsable attribute stops the property from showing up in the Properties window and therefore excludes the property from being assigned in the Properties window This is needed because no editor is associated with this property, and we don t want users to try to add anything into the Properties window that would corrupt the values The Designer SerializationVisibility attribute with a value of DesignerSerialization VisibilityHidden is used to indicate that the property value should not be persisted by the designer because the Animation property will take care of that for us The DefaultValue attribute indicates to the designer that the default value will be null, and the ExtenderControlProperty attribute is used to register the property with the ScriptComponentDescriptor
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11: Adding Client Capabilitie s to Ser ver Controls Using the A SPNET AJA X Control Toolkit
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Listing 1115 ImageAnimationExtender Class
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[Designer(typeof(ImageAnimationDesigner))] [ClientScriptResource("ImageAnimationImageAnimationBehavior", "ImageAnimationImageAnimationBehaviorjs")] [RequiredScript(typeof(AnimationExtender))] [ToolboxItem("SystemWebUIDesignWebControlToolboxItem, SystemDesign, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] [TargetControlType(typeof(Image))] public class ImageAnimationExtender : AnimationExtenderControlBase { private Animation _onLoad; [DefaultValue(null)] [Browsable(false)] [ExtenderControlProperty] [DesignerSerializationVisibility( DesignerSerializationVisibilityHidden)] public new Animation OnLoad { get { return GetAnimation(ref _onLoad, "OnLoad"); } set { SetAnimation(ref _onLoad, "OnLoad", value); } } }
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The ImageAnimationBehavior class, shown Listing 1116, provides all the client-side functionality for our extender with support from the animation script les associated with the AutomationExtender class These associated scripts provide support for converting the JSON representation of the FadeIn animation that was captured on the server to an actual animation, support for associating the animation with the high-level OnLoad event, and support for playing the animation when the OnLoad event occurs You need to complete a few steps for each event you plan to work with: 1 Add variables to the class 2 Create functions 3 Add handlers
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