Adding Animations to Your Extender Control in .NET framework

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Listing 1113 AnimatedImageRotator Behavior Class
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AnimatedImageRotatorAnimatedImageRotatorBehavior = function(element) { this_fadeAnimation = null; this_timer = null; this_onImageLoadHandler = null; } AnimatedImageRotatorAnimatedImageRotatorBehaviorprototype = { initialize : function() { if(this_fadeAnimation == null) { this_fadeAnimation = new AjaxControlToolkitAnimationFadeAnimation( element, this_rotationInterval/20, 150, AjaxControlToolkitAnimationFadeEffectFadeIn, 0, 1, true); } if (element) { this_onImageLoadHandler = FunctioncreateDelegate(this, this_onImageLoad); $addHandler(element, 'load', this_onImageLoadHandler); } }, dispose : function() { var element = thisget_element(); if (element) { if (this_onImageLoadHandler) { $removeHandler(element, 'load', this_onImageLoadHandler); this_onImageLoadHandler = null; } } if (this_fadeAnimation) { this_fadeAnimationdispose(); this_fadeAnimation = null; }
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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 1113 continued
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}, _onImageLoad: function(){ if(this_fadeAnimation) this_fadeAnimationplay(); }, }
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Table 111 Partial List of Fade Animation Class Properties Property target duration fps effect Description
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Target of the animation Length of the animation in seconds The default is 1 Number of steps per second The default is 25 Determine whether to fade the element in or fade the element out The possible values are AjaxControlToolkit AnimationFadeEffectFadeIn and AjaxControlToolkit AnimationFadeEffectFadeOut The default value is FadeOut Minimum opacity to use when fading in or out Its value can range from 0 to 1 The default value is 0 Maximum opacity to use when fading in or out Its value can range from 0 to 1 The default value is 1 Explorer by giving it a width and setting its background color (the latter is required in case the user has ClearType enabled) The default value is true
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minimumOpacity
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maximumOpacity
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forceLayoutInIE Whether we should force a layout to be created for Internet
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Adding Animations to Your Extender Control
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Animations Using the Declarative Method The declarative approach to animation in the toolkit provides a nice extensibility path for consumers of your extender In our previous example, we hard coded all the animation functionality inside our extender, providing little support for developer customization In some cases, this might be all that is needed In other cases, however, you might need to provide a more robust solution that provides a JavaScript-free way to customize animations In this section, we replicate the same functionality we created in the preceding section, but we provide a more extensible approach consumers of our extender can use when they are con guring it in the designer The extender we create has just one feature: the capability to run a FadeIn animation when the onLoad event of an associated image control occurs This new extender will be used in addition to the ImageRotator extender we created earlier, which had no animation functionality This re ned approach to adding animation support builds on the principle that many extenders can be placed on a single control to provide combined client-side capabilities To get started, let s take a look at what the declarative syntax or our control will look like before we go into the implementation details Just as in the preceding section, as we cover how to add this new animation functionality we gloss over the topics we have already covered, focusing only on implementing the declarative animation pieces
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Overview of Declarative Syntax
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To get started, let s look at the HTML source we will be working toward being able to work with in our ImageAnimation extender The source in Listing 1114 contains an ImageAnimationExtender tag that contains in its body an Animations tag As you might guess, the approach here is to add various animations that are driven by events raised by the image control we are extending In our case, we are working with the OnLoad event and adding a Sequence animation that will call a child Fade animation A Sequence animation is designed to run all its child animations one at a time until all have nished So, what this source tells us is that our extender will have an animation that will be tied to the OnLoad event of the image control and will run the child Fade animation whenever the OnLoad event occurs
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