birt report barcode font Next, a for loop repeats a particular set of actions. The duration of the loop depends on the in Font

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2. Next, a for loop repeats a particular set of actions. The duration of the loop depends on the
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number of selected items, based on the Array.length property of the selectedItems property of the List component. The variable i starts at zero and increments at each lap around the loop, so that this line: str += list.selectedItems[i].data; refers to the first selected item (item 0) on the first lap, then the second selected item (item 1) on the second lap, and so on. There s a .data tacked onto the end because List items are made up of two parts: label and data, which are bingo! the elements that make up the dataProvider parameter described previously. An if statement adds a comma between items in the middle and a period after the item at the end.
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3. Finally, the str variable, which has continuously been updated by this process, is set to the
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TextField.text property of the output instance. The net result is that List selections populate a dynamic text field with the ingredients of Kraft Cucumber Ranch salad dressing. For extra credit, add the following line after the existing ActionScript: list.addItem({label:"Ingredient 11", data:"natural flavor"}); This shows that it s also possible to populate a List instance programmatically.
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NumericStepper component
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NumericStepper is a compact little gadget that lets the user specify a numeric value, either by typing it in or by clicking up and down arrow buttons, as shown in Figure 11-19. For example, let s assume you have 10 widgets for sale. The numeric stepper component restricts a user from ordering 11 widgets. You, as a designer, can specify your own desired minimum and maximum values, as well as the size of each increment (count by ones, by twos, by tens, and so on). These values can be set via the Component Parameters area of the Properties panel.
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Figure 11-19. The NumericStepper component
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BUILDING INTERFACES WITH THE UI COMPONENTS
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NumericStepper s skins can be edited by double-clicking an instance, and styling can be applied as described in the Button component section. This component carries with it the TextInput component, so you ll see both in your Library if you add NumericStepper to your movie.
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Using one or more instances of the NumericStepper component in your movie will add 18KB to the SWF if no other components (other than the automatically included TextInput) share the load.
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Let s play with the NumericStepper component:
1. Open the NumericStepper.fla file in the 11 Exercise folder. Note that the
NumericStepper instance has the instance name ns and that the thermometer movie clip has the instance name thermometer.
2. In the Library, double-click the thermometer movie clip to enter its timeline, and you ll see a
red rectangle (masked by a green shape) with the instance name mercury, as shown in Figure 11-20. You re going to set the height of this nested movie clip based on the value of the NumericStepper.
Figure 11-20. The mercury will rise and fall in response to NumericStepper clicks.
3. Select Edit Edit Document, or double-click the Scene 1 link to return to the main timeline. 4. Click into frame 1 of the scripts layer, and type the following ActionScript:
ns.addEventListener(Event.CHANGE, changeHandler); function changeHandler(evt:Event):void { thermometer.mercury.height = ns.value; };
5. Test your movie. Click the up and down arrow buttons to see the component in action. Close the
SWF when you are finished experimenting. The MovieClip.height property of mercury is set to the value of NumericStepper ns.value as referenced in terms of the ns instance. The mercury movie clip is nested inside thermometer, which explains the matching hierarchical reference thermometer.mercury.
ProgressBar component
Used often for preloading, the ProgressBar component gives you a rising thermometer-style animation to display load progress when loading files of known size and gives you a barber pole style animation to indicate that the user must wait (for example, for files of unknown size to load or for processes to finish). Figure 11-21 shows an example. This component doesn t have a whole lot to skin, but you can access what s there by double-clicking a ProgressBar instance. Styling works as it does for the Button component, but ProgressBar doesn t even have text, so your styling choices are fairly slim.
Figure 11-21. The ProgressBar component and its parameters
Using one or more instances of the ProgressBar component in your movie will add 16KB to the SWF if no other components share the load. That means 16KB of nonpreloadable content (the preloader itself!), so don t put much else into the frame that contains the ProgressBar component.
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