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https://issues.apache.org/jira/browse/FLEX-27837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Mclean updated FLEX-27837:
---------------------------------
Labels: easyfix (was: )
> ChangeWatcher bug
> -----------------
>
> Key: FLEX-27837
> URL: https://issues.apache.org/jira/browse/FLEX-27837
> Project: Apache Flex
> Issue Type: Bug
> Components: .Unspecified - Framework
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): Windows
> Affected OS(s): Windows XP
> Language Found: English
> Reporter: Adobe JIRA
> Labels: easyfix
>
> When I used this class BindingUtils to binding work, I called this method:
> public static function bindSetter(setter:Function, host:Object,
> chain:Object,
> commitOnly:Boolean = false,
> useWeakReference:Boolean =
> false):ChangeWatcher
> I found there is a wrong description about the "useWeakReference", below is
> the signature of useWeakReference in the API Document:
> useWeakReference : Boolean
> (default = false) Determines whether the reference to the host is strong or
> weak.
> but I don't think it determines the host, but the ChangeWatcher instance
> itself, it determines whether the reference to the ChangeWatcher instance is
> strong or weak.
> So,I test the ChangeWatcher instance is real be gced. If the chain's length
> is only 1,the useWeakReference works, the ChangeWatcher instance will be
> gced,but if the chain's length is more than 1,the useWeakReference doesn't
> work.
> the source code:
> BindingUtils :
> public static function bindSetter(setter:Function, host:Object,
> chain:Object,
> commitOnly:Boolean = false,
> useWeakReference:Boolean =
> false):ChangeWatcher
> {
> var w:ChangeWatcher =
> ChangeWatcher.watch(host, chain, null, commitOnly,
> useWeakReference);
>
> if (w != null)
> {
> var invoke:Function = function(event:*):void
> {
> setter(w.getValue());
> };
> w.setHandler(invoke);
> invoke(null);
> }
>
> return w;
> }
> ChangeWatcher :
> public static function watch(host:Object, chain:Object,
> handler:Function,
> commitOnly:Boolean = false,
> useWeakReference:Boolean =
> false):ChangeWatcher
> {
> if (!(chain is Array))
> chain = [ chain ];
> if (chain.length > 0)
> {
> var w:ChangeWatcher =
> new ChangeWatcher(chain[0], handler, commitOnly,
> watch(null, chain.slice(1), handler, commitOnly));
> //there is the reason!the default arg is false,so the 1st ChangeWatcher is
> "useWeakReference = true",but others are "ChangeWatcher = false"
> w.useWeakReference = useWeakReference;
> w.reset(host);
> return w;
> }
> else
> {
> return null;
> }
> }
> I think the right code must be "watch(null, chain.slice(1), handler,
> commitOnly, useWeakReference)); "
> the chain of ChangeWatchers will not be gced.
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