java data matrix library Using Fade Animations in Java

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Using Fade Animations
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The first animation that you will look at is the fade animation, where the opacity of a layer is changed going either toward value 1 (fade-in) or toward value 0 (fade-out). Figure 9-3 and Figure 9-4 show the state of a layer at the beginning and at the end of a fade-in animation.
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CHAPTER 9 s USING THE ATLASUIGLITZ LIBRARY
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Figure 9-3. The layer at the beginning of a fade-in
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Figure 9-4. The layer at the end of a fade-in
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You achieve this fade using Web.UI.FadeAnimation. Tied to the button s OnClick event is the following JavaScript: function FadeIn() { var a = new Web.UI.FadeAnimation(); a.set_target(Web.Application.findObject('Description')); a.set_effect(Web.UI.FadeEffect.FadeIn); a.play(); } Here an instance of a new Web.UI.FadeAnimation is created and gets tied to the Description object. The effect is set to Web.UI.FadeEffect.FadeIn, and when the play method is called, the animation trips, and the layer fades in. In a similar manner, you can fade out a layer using Web.UI.FadeEffect.FadeOut like this: function FadeOut() { var a = new Web.UI.FadeAnimation(); a.set_target(Web.Application.findObject('Description2')); a.set_effect(Web.UI.FadeEffect.FadeOut); a.play(); } You can see the effect of this in Figure 9-5 and Figure 9-6.
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Figure 9-5. Beginning the fade-out on the second layer
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Figure 9-6. Continuing the fade-out on the second layer
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You can also set up your animation using Atlas Script. In this case, you create an abstract animation control in Atlas Script and tie that control to the area you want to animate. Then you can, for example, attach an action to a button that triggers the animation. Considering the previous example, the markup for the Fade-In button will look like this: <input id="btnFadeIn" type="button" value="Fade-In" /> The important thing to note is its ID, which is btnFadeIn. This is what you will use to reference it in Atlas Script. Next, you create the animation control. Within your Atlas Script controls declaration, you will have markup like this: <fadeAnimation id="thefadeAnimation" target="Description" effect="FadeIn" /> The FadeAnimation controls description uses the attributes shown in Table 9-1. Table 9-1. FadeAnimation Attributes
Attribute Name
ID Target Effect
Description
The identity for this animation, used by other controls to trigger actions on this control. The page element to which to apply the animation. Can be FadeIn or FadeOut. Defines how the fade animation runs. FadeIn takes it from Invisible to Visible; FadeOut does the opposite.
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In this case, you can see that the animation is called thefadeAnimation, it is set to target the <div> element on the HTML page that is called Description, and the effect that will be used to animate it is FadeIn. You can then trigger the animation to take place upon clicking the Fade-In button using an <invokeMethod> on its <click> action like this: <button id="btnFadeIn"> <click> <invokeMethod target="thefadeAnimation" method="play" /> </click> </button> Then when you click the button, you get the same behavior as earlier.
Using Length Animations
Another animation that you can use is the length animation, which changes the state of a property between a start and an end value that you can specify. You can typically use this to animate the setting of the width or height of a control that uses them. However, because it simply sets the property of a control to the numeric value between the start value and the end value, it can also perform countups or countdowns if applied to the text property of a control. Table 9-2 lists the properties of the animation. Table 9-2. LengthAnimation Properties
Property Name
Target Property StartValue EndValue Unit Duration
Description
Specifies the target control for the animation. Specifies which property will be the target for the animation. Specifies the start value for animation. Specifies the end value for animation. Text specifying the unit to use. Examples are px for pixels or % for percentage. Specifies the duration (in seconds) that it should take to play the animation.
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You can see the length animation in action in Figure 9-7, Figure 9-8, and Figure 9-9. Figure 9-7 shows the application before the animation begins, Figure 9-8 shows the animation as it is in progress and the image is growing, and Figure 9-9 shows the completed animation.
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