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The exclamation point (!) in front of the isNaN() function inverts whatever that function says, in the same way that the inequality operator (!=) means is not equal to If you want to find out if a value is not a valid number, check it against isNaN() On the other hand, if you want to find out if a value is a valid number, check it against !isNaN() The flip side of that if statement meaning, pos is an unusable number simply sets the knob s position to the position of the bar, which resets the knob to its original hug-the-left-side location As the song plays through, this seekKnobUpdate() function is triggered every time the timeline enters a frame, in other words, continuously This causes the knob to indicate progress until the function is instructed to stop Go ahead, test the SWF and give it a whirl.

Listing 3-9 shows a sample of the auto-generated service proxy class. Listing 3-9. The Auto-Generated Service Proxy Class

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The mechanics of the volume slider work in pretty much the same way A similar knob symbol is instructed to drag within a constrained area The difference is that the knob s position in relation to its bar is used to adjust the volume of the currently playing song In addition, a separate symbol is instructed to follow the knob, whose movement either hides or reveals that symbol behind a mask Let s add the code Continuing below the previous ActionScript, give yourself another code comment heading, this time captioned as Volume slider Type in these additional new lines: //////////////////////////////////////// // Volume slider //////////////////////////////////////// // prep volumeSlidervolumeKnobbuttonMode = true; // events volumeSlidervolumeKnobaddEventListener(MouseEventMOUSE_DOWN, volumeStartDrag); The volumeKnob instance is nested inside volumeSlider, and that s because those movie clips are nested Other than that, there is nothing remarkable about this addition Let s keep rolling.

Enter the following new ActionScript, which defines the volumeStartDrag() function just referenced: function volumeStartDrag(evt:MouseEvent):void { rect = new Rectangle(8, volumeSlidervolumeKnoby, volumeSlidervolumeBarwidth - 8, 0); volumeSlidervolumeKnobstartDrag(true, rect); volumeSlidervolumeKnobaddEventListener(MouseEventMOUSE_MOVE, volumeAdjust); stageaddEventListener(MouseEventMOUSE_UP, volumeStopDrag); };.

Another solution is to define the Rectangle as a type that subclasses Square, which is defined as follows: class Square { private long _width; public Square( long width) { _width = width; } public virtual long Width { get { return _width; } set { _width = value; } } } class Rectangle : Square { private long _length; public Rectangle( long length, long width) : base(width) { _length = length; } public virtual long Length { get { return _length; }

As with the other slider, rect is set to a new Rectangle instance when the knob is clicked and fed appropriate values. In this case, the values are purposefully tweaked to move the knob in from the left edge just a bit. Why Because if the volume knob were dragged all the way to the left, it would completely obscure the red movie clip rectangle behind the slanted five-column mask. Letting it go almost all the way to the left 8 pixels shy, in this case looks good visually.

[System.Web.Services.WebServiceBindingAttribute(Name="StockTraderServiceSoap", Namespace="http://www.bluestonepartners.com/schemas/StockTrader")] public class StockTraderProxy : System.Web.Services.Protocols.SoapHttpClientProtocol { public StockTraderProxy() {} [System.Web.Services.Protocols.SoapDocumentMethodAttribute( "http://www.bluestonepartners.com/schemas/StockTrader/RequestQuote", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Bare)] [return: System.Xml.Serialization.XmlElementAttribute("Quote",

Where did the 8 come from Even though it is an arbitrary figure, sometimes these numbers just appear, and you learn to live with them (but they still make you feel a bit weird because they don t quite adhere to the normal programmatic logic). The startDrag() method is invoked on volumeKnob, and again the stage is associated with a MouseEvent.MOUSE_UP event to stop the dragging. This time, though, an additional event (MOUSE_MOVE) is associated with a custom function named volumeAdjust(). Let s look at both of those. Enter the following new ActionScript: function volumeStopDrag(evt:MouseEvent):void { volumeSlider.volumeKnob.stopDrag(); stage.removeEventListener(MouseEvent.MOUSE_UP, volumeStopDrag); volumeSlider.volumeKnob.removeEventListener(MouseEvent.MOUSE_MOVE, volumeAdjust); }; function volumeAdjust(evt:MouseEvent):void { volumeSlider.volumeBar.x = volumeSlider.volumeKnob.x; if (channel != null) { xform = channel.soundTransform; xform.volume = (volumeSlider.volumeKnob.x - 8) / (volumeSlider.volumeBar.width - 8); channel.soundTransform = xform; } }; The volumeStopDrag() function is old hat by now. It stops the dragging and stops the MOUSE_MOVE handler. Let s break down the volumeAdjust() function. First off, it sets the position of volumeBar to the position of volumeKnob. That hides and reveals the red rectangle behind its mask in concert with the knob s position. After that, assuming channel is not null, the xform variable declared early on is set to the SoundChannel.soundTransform property of the channel instance. This gives xform a SoundTransform.volume property, whose value is set in terms of volumeKnob s position (accounting for that 8-pixel shy span) in relation to the width of volumeBar.

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