Re: Clearing List Control
I don't know if you are referring to MX List or Spark List, but it may not matter. IIRC, there is logic in the List classes to recalculate selection when the data provider is changed. For sure, most of Flex uses an invalidation/validation model. This allows you to set a property multiple times without it actually having an effect on the component. I'd bet if you sprinkled a few more validateNow() calls in there you'd get different results. IOW, if at some point: list.dataProvider = ac; Later if you just do: list.dataProvider = null; list.dataProvider = ac; It may not have an affect since the change to DP will not be processed until later (or on validateNow()). By making a deep copy of the original DP, you are changing the DP and the UID of its items to something different which might trigger the change detection logic and also result in different behavior. HTH, -Alex On 9/29/16, 1:47 PM, "Matthew Weir" wrote: >Apparently this works, But I don't understand why you just can't say the >selectedIndicies are null or new Vector >var ac:ArrayCollection = new >ArrayCollection(ObjectUtil.copy((list.dataProvider as >ArrayCollection).source) as Array); >ac.refresh();list.dataProvider = ac; > >On Thursday, September 29, 2016 4:31 PM, Matthew Weir > wrote: > > > I'm stumped guys. I must be missing something completely, ridiculously, >easy. >list.selectedIndices = new Vector.(); >var ac:ArrayCollection = list.dataProvider as >ArrayCollection; >list.dataProvider = null; >ac.refresh(); >list.selectedIndices = null; >list.selectedIndex = -1; >list.dataProvider = ac; >list.invalidateDisplayList(); >list.validateNow() >Still shows selected items. >Help! Please :) > > >
Re: Clearing List Control
Nevermind. I'm silly. I just realized what I sent lol. If it's null it'll set it to a new empty Vector. Ignore me please :) Kyle McKnight Senior UI Engineer - Accesso 602.515.1444 (M) On Thu, Sep 29, 2016 at 4:52 PM, Kyle McKnight wrote: > Did you try list.selectedIndices = []? > > The documentation says that the default value is []. So I looked at the > source for List for selectedIndices setter. Looks like if value is null, it > won't set the indices, so it won't get updated. > > if (value) > _proposedSelectedIndices = value; > else > _proposedSelectedIndices = new Vector.(); > > > > > Kyle McKnight > Senior UI Engineer - Accesso > 602.515.1444 (M) > > On Thu, Sep 29, 2016 at 4:47 PM, Matthew Weir < > mattcomm...@yahoo.com.invalid> wrote: > >> Apparently this works, But I don't understand why you just can't say the >> selectedIndicies are null or new Vector >> var ac:ArrayCollection = new >> ArrayCollection(ObjectUtil.copy((list.dataProvider >> as ArrayCollection).source) as Array); >> ac.refresh();list.dataProvider = ac; >> >> On Thursday, September 29, 2016 4:31 PM, Matthew Weir >> wrote: >> >> >> I'm stumped guys. I must be missing something completely, ridiculously, >> easy. >> list.selectedIndices = new Vector.(); >> var ac:ArrayCollection = list.dataProvider as >> ArrayCollection; >> list.dataProvider = null; >> ac.refresh(); >> list.selectedIndices = null; >> list.selectedIndex = -1; >> list.dataProvider = ac; >> list.invalidateDisplayList(); >> list.validateNow() >> Still shows selected items. >> Help! Please :) >> >> >> > > >
Re: Clearing List Control
Did you try list.selectedIndices = []? The documentation says that the default value is []. So I looked at the source for List for selectedIndices setter. Looks like if value is null, it won't set the indices, so it won't get updated. if (value) _proposedSelectedIndices = value; else _proposedSelectedIndices = new Vector.(); Kyle McKnight Senior UI Engineer - Accesso 602.515.1444 (M) On Thu, Sep 29, 2016 at 4:47 PM, Matthew Weir wrote: > Apparently this works, But I don't understand why you just can't say the > selectedIndicies are null or new Vector > var ac:ArrayCollection = new > ArrayCollection(ObjectUtil.copy((list.dataProvider > as ArrayCollection).source) as Array); > ac.refresh();list.dataProvider = ac; > > On Thursday, September 29, 2016 4:31 PM, Matthew Weir > wrote: > > > I'm stumped guys. I must be missing something completely, ridiculously, > easy. > list.selectedIndices = new Vector.(); > var ac:ArrayCollection = list.dataProvider as > ArrayCollection; > list.dataProvider = null; > ac.refresh(); > list.selectedIndices = null; > list.selectedIndex = -1; > list.dataProvider = ac; > list.invalidateDisplayList(); > list.validateNow() > Still shows selected items. > Help! Please :) > > >
Re: Clearing List Control
Apparently this works, But I don't understand why you just can't say the selectedIndicies are null or new Vector var ac:ArrayCollection = new ArrayCollection(ObjectUtil.copy((list.dataProvider as ArrayCollection).source) as Array); ac.refresh();list.dataProvider = ac; On Thursday, September 29, 2016 4:31 PM, Matthew Weir wrote: I'm stumped guys. I must be missing something completely, ridiculously, easy. list.selectedIndices = new Vector.(); var ac:ArrayCollection = list.dataProvider as ArrayCollection; list.dataProvider = null; ac.refresh(); list.selectedIndices = null; list.selectedIndex = -1; list.dataProvider = ac; list.invalidateDisplayList(); list.validateNow() Still shows selected items. Help! Please :)
Clearing List Control
I'm stumped guys. I must be missing something completely, ridiculously, easy. list.selectedIndices = new Vector.(); var ac:ArrayCollection = list.dataProvider as ArrayCollection; list.dataProvider = null; ac.refresh(); list.selectedIndices = null; list.selectedIndex = -1; list.dataProvider = ac; list.invalidateDisplayList(); list.validateNow() Still shows selected items. Help! Please :)
