Why is everybody overriding things like combobox to do this? You could cook up a util to do it in 15 minutes.
In fact, I'll be back in 15 minutes. On Thu, Oct 16, 2008 at 8:25 AM, frank_sommers <[EMAIL PROTECTED]>wrote: > Thanks for the replies. > > Well, Jitendra's solution worked only when I created a ComboBox subclass > that did take a > special equals() (based on the value of a property named "id") into > account. Basically, I > overrode the selectedItem property in this subclass. > > I think equals() and hashCode() are absolutely important, and I find that > it's a pain that > Flex doesn't have them: In collection contains() methods, selecting items > in controls, etc., > an equals() semantic is really important. There are many duplicate objects > that are > semantically equivalent in RIA clients, and without well-defined semantics > for equality I'm > finding that I have to implement this sort of logic in components myself. > > Any chance that this may be addressed in forthcoming Flex versions? > > Thanks, > > -- Frank > > --- In flexcoders@yahoogroups.com, Maciek Sakrejda <[EMAIL PROTECTED]> wrote: > > > > Frank, > > > > There's no .equals() in actionscript unless you implement it yourself. > > Without hearing more about the context, it's hard to tell whether > > Jitendra's data binding solution would work for this specific problem > > (data binding would effectively set the list selection to an object that > > is not in the list--I'm not sure what happens there), but you might run > > into a need for .equals() further down the line. We did, and since all > > of our VOs inherit from one VO base object, we just implement .equals() > > in these as necessary. It seems rather horrifying that there's > > no .equals() at first, but you don't really need it that often... > > > > -- > > Maciek Sakrejda > > Truviso, Inc. > > http://www.truviso.com > > > > -----Original Message----- > > From: frank_sommers <[EMAIL PROTECTED]> > > Reply-To: flexcoders@yahoogroups.com > > To: flexcoders@yahoogroups.com > > Subject: [flexcoders] Java-like equals() method? > > Date: Sat, 11 Oct 2008 02:54:18 -0000 > > > > Hi, > > > > I've been searching for a good solution to implementing object equality. > > I'm familiar with > > ObjectUtil, etc., but it still makes things harder than they should be. > > > > It may be best to illustrate this with an example. Suppose I have a > > ComboBox with an > > ArrayCollection as a data provider. The ArrayCollection is populated > > with value objects > > from the server, e.g., User objects. Suppose that I have a Task class, > > and a Task may > > have an assignedToUser property, which is a User instance. When the > > someone selects a > > Task (say, in a master-detail view), I would like the ComboBox to set > > its selectedItem to > > the user for the given Task, i.e., combBox.selectedItem = > > myUser.assignedToUser. > > > > The problem is that no Task in the ComboBox's data provider and the > > User's > > assignedToUser property are ever equal using the == or === operators. > > > > So I would like to implement a custom equality for User, and have the > > ComboBox use that > > to set its selectedItem to the specified user. In Java, this is easily > > done by overriding the > > equals() and hashCode() methods of User. > > > > Any suggestions on how to achieve something similar in Flex would be > > much appreciated. > > > > Thanks, > > > > -- Frank > > > > > > > ------------------------------------ > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Alternative FAQ location: > https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847 > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups > Links > > > > -- "Therefore, send not to know For whom the bell tolls. It tolls for thee." Like the cut of my jib? Check out my Flex blog! :: Josh 'G-Funk' McDonald :: 0437 221 380 :: [EMAIL PROTECTED] :: http://flex.joshmcdonald.info/
