That seems overly complicated to me. What I would try is create two custom components then instantiate the appropriate one based on the data and add it in the updateDisplayList method.
--- In flexcoders@yahoogroups.com, Wesley Acheson <wesley.ache...@...> wrote: > > Since nobody has replied I'm continueing to try this. I currently think I > may need to override all methods in UI component. > > > Is it clear what I'm trying to do? > > Is this the wrong way of doing it? > > I think its probably lighter than wrapping to components in a fully fledged > UI component? > * > Some Thoughts* > > Also a comment on ListItemRenderer, theres an awful lot of methods that need > to be implemented to make this work. I doubt all of them are used in a List > Senario. Even implementing them all theres still a dependency on > DisplayObject (who's methods seem to be implemented). It does feel to me > like the architecture seems a bit off. I mean if all of those methods are > implemented why is there still a dependency on DisplayObject. > > Its not just enough to implement IListRenderer which seems to defeat the > purpose of an interace > > On Wed, Aug 18, 2010 at 11:42 PM, Wesley Acheson > <wesley.ache...@...>wrote: > > > *Disclaimer:* This is a cross post with Stack Overflow. I know at least > > one person on this list saw it there. > > http://stackoverflow.com/questions/3507313/flex-switch-item-renderer > > > > Hi > > > > I was wondering if anyone had any luck with the following senario in flex. > > > > I'd like to be able to have a custom item renderer which delegates to > > another renderer inside. > > > > The reason for this would be in a datagrid for instance displaying a > > checkbox if the dataprovider for the row had a boolean value. Using the > > default item renderer when the value was a non boolean. > > > > Basically I was hoping to use a proxy object (though not necessarily the > > proxy class) so that I could a renderer which delegated all of its > > responsibilties to a sub renderer. > > > > Hard to explain. > > > > *Edit 1* > > > > I think the following gives a clearer idea of what I had in mind. This is > > only knocked up quickly for the purpose of showing the idea. > > > > *SwitchingRenderer.as* > > > > package com.example > > { > > import mx.controls.CheckBox; > > > > import mx.controls.dataGridClasses.DataGridItemRenderer; > > > > import mx.controls.listClasses.BaseListData; > > > > import mx.controls.listClasses.IDropInListItemRenderer; > > > > import mx.core.IDataRenderer; > > > > import mx.core.UIComponent; > > > > public class SwitchingRenderer extends UIComponent implements > > IDataRenderer, IDropInListItemRenderer > > > > { > > private var checkboxRenderer:CheckBox; > > > > private var defaultRenderer:DataGridItemRenderer; > > > > private var currentRenderer:IDataRenderer; > > > > public function SwitchingRenderer() > > > > { > > this.checkboxRenderer = new CheckBox(); > > > > this.defaultRenderer = new DataGridItemRenderer(); > > > > this.currentRenderer = defaultRenderer(); > > > > super(); > > } > > > > public function get data():Object > > > > { > > //If the data for this cell is a boolean > > // currentRender = checkBoxRenderer > > > > // otherwise > > // currentRenderer = defaultRenderer > > } > > > > public function set data(value:Object):void > > > > { > > currentRenderer.data = value; > > > > } > > > > public function get listData():BaseListData > > > > { > > return currentRenderer.listData; > > > > } > > > > public function set listData(value:BaseListData):void > > > > { > > currentRenderer.listData = value; > > > > } > > > > > > > > } > > } > > > > > > >
