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The ScrollPane component lets you have eyes bigger than your stomach. If you want to display a superlarge image so large that you ll need scrollbars ScrollPane is your component; Figure 11-24 shows it in action.
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Figure 11-24. ScrollPane provides optional scrollbars to accommodate oversized content. ScrollPane has nested skins because of its scrollbars, so double-clicking an instance during authoring will open its skin elements in tiers. Styling works the same as described in the Button component section, although with no text elements, most of your customization work will probably center around skins.
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BUILDING INTERFACES WITH THE UI COMPONENTS
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Using one or more instances of the ScrollPane component in your movie will add 21KB to the SWF if no other components share the load.
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In this example, there s no need for ActionScript.
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1. Open the ScrollPane.fla file in this chapter s Exercise folder. Select the ScrollPane
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instance, and click the Parameters tab of the Component Inspector panel.
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2. In the Component Parameters area, double-click the right column of the source row. Type
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Redleaves.jpg.
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3. Test the movie. Pretty slick! The source parameter can be pointed to any file format that Flash
can load dynamically, including JPEGs, GIFs, PNGs, and other SWFs.
Slider component
The Slider component is conceptually the same thing as NumericStepper, except that instead of clicking buttons to advance from one number to the next, the user drags a knob along a slider, as shown in Figure 11-25. You, as designer, are responsible for setting the minimum and maximum values, and this component lets you specify whether sliding is smooth or snaps to increments specified by you.
Figure 11-25. Slider lets the user drag a handle back and forth to specify a value. Slider has no text elements, so styling is fairly light. What s there works as it does for the Button component. Skinning also works as it does for Button: double-click a Slider instance in the authoring environment to change the knob and track skins.
Using one or more instances of the Slider component in your movie will add 17KB to the SWF if no other components share the load.
To see how the Slider component works, open the Slider.fla file in this chapter s Exercise folder. Note that the instance name for the Slider instance is slider, which works only because ActionScript is a case-sensitive language. You couldn t call it Slider, because that s the name of the class that defines this object. Also note the instance names circle1 and circle2 on the two circles. You re about to wire up the Slider component to adjust their width and height. Click into frame 1 of the scripts layer, and type the following ActionScript:
slider.addEventListener(Event.CHANGE, changeHandler); function changeHandler(evt:Event):void { circle1.scaleX = slider.value / 100; circle2.scaleY = slider.value / 100; }; When the Event.CHANGE event is dispatched this happens as the knob moves along the track the slider s value property is used to update scaling properties of the circle movie clips. Why divide by 100 In movie clip scaling, 0 percent is 0 and 100 percent is 1. Because the Slider instance happens to have its maximum parameter set to 100, the division puts value into the desired range, as shown in Figure 11-26.
Figure 11-26. A single Slider instance can adjust many objects. Hey, that looks like a face! Be sure to experiment with the parameters in the Properties panel s Component Parameters area. Most of them are intuitive, but liveDragging and snapInterval might not be. The liveDragging parameter tells Slider whether to update its value property as the knob moves, as opposed to when it is released. When you set liveDragging to false (deselected), the circles will resize only after you reposition the knob and then release it. The snapInterval parameter tells Slider how often to update its value property. To demonstrate, set liveDragging to true (a check mark), and then change snapInterval to a small number, such as 1. When you drag the knob, you ll see the circles resize smoothly. Change snapInterval to 10 and test again, and the circles resize less smoothly, because you re asking value to count by tens. You may be surprised to find a direction parameter (its values are horizontal and vertical). Why not just use the Free Transform tool to rotate this slider Well, try it. We ll wait...that s kind of weird, right It doesn t work. Components are a sophisticated phenomenon, even though they look so simple. Now, what if you want a slanted slider, not horizontal or vertical Here s a trick: select the Slider instance, convert it to a movie clip (Modify Convert to Symbol), and give that movie clip an instance name such as sliderClip. When both the movie clip and its nested Slider have instance names, you re set. sliderClip.slider.addEventListener(Event.CHANGE, changeHandler); function changeHandler(evt:Event):void { circle1.scaleX = sliderClip.slider.value / 100; circle2.scaleY = sliderClip.slider.value / 100; };
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