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POBinding to a read-only getter in AS3
 

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    <p>Consider the following code:</p> <pre><code>[Bindable(event="ReportHeaderVO_effectiveFromDateJulian_updated")] public function set effectiveFromDateJulian ( value:Number ) : void { _effectiveFromDateJulian = value; dispatchEvent( new FlexEvent("ReportHeaderVO_effectiveFromDateJulian_updated") ); } public function get effectiveFromDateJulian () : Number { return _effectiveFromDateJulian; } public function get effectiveFromDate () : Date { return DateUtil.convertJDEJulianToDate(_effectiveFromDateJulian); } </code></pre> <p>There is a setter and a getter for the effectiveFromDateJulian which is a number representation of the date. I have provided a seperate getter which retrieves the same value, only converted to a proper date. It is a getter only though and relies on the setter for the numeric property to get its data from; so the effectiveFromDate property is effectively read-only.</p> <p>Data binding works on the effectiveFromDateJulian property; any updates work fine and notify everything properly. But when binding to the effectiveFromDate (getter only) property, I get a warning from the compiler: </p> <pre><code>warning: unable to bind to property 'effectiveToDate' on class 'com.vo::ReportHeaderVO' </code></pre> <p>Is there a way to make it possible to bind to this read-only property? I would assume I would have to dispatch an event on the setter that effects the read-only property, but I don't know what that would look like. </p> <p>This is a simple example, you could imagine a read-only property that depends on several setters to function and when any of those setters are updated the read-only property would need to fire a propertyChanged event as well. Any ideas? Please let me know if I need to clarify anything.</p> <p>Update: From the Adobe documentation here:</p> <p><a href="http://livedocs.adobe.com/flex/3/html/help.html?content=databinding_8.html" rel="noreferrer">http://livedocs.adobe.com/flex/3/html/help.html?content=databinding_8.html</a></p> <blockquote> <p>Using read-only properties as the source for data binding</p> <p>You can automatically use a read-only property defined by a getter method, which means no setter method, as the source for a data-binding expression. Flex performs the data binding once when the application starts.</p> <p>Because the data binding from a read-only property occurs only once at application start up, you omit the [Bindable] metadata tag for the read-only property.</p> </blockquote> <p>And this makes sense for constant values, but in this case the value does change, it just doesn't get set directly.</p>
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