The use case is when you have a list of objects on the left, and an editable form on the right. And you want to display an alert "Discard changes | Cancel" when switching context with unsaved changes.
So you don't know up front if selection should be allowed or not. But disabling list selection (or using modal popups) are indeed alternative UIs. On Fri, May 15, 2009 at 10:16 AM, Alex Harui <[email protected]> wrote: > > > Do you just want to set selectable=false on the List in certain > situations? > > > > Alex Harui > > Flex SDK Developer > > Adobe Systems Inc. <http://www.adobe.com/> > > Blog: http://blogs.adobe.com/aharui > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Richard Rodseth > *Sent:* Friday, May 15, 2009 7:01 AM > *To:* [email protected] > *Subject:* Re: [flexcoders] Preventing list selection > > > > > > > Actually, I take it back, the highlighting is the roll-over highlighting > - but the item does appear selected while the modal dialog is up. > > On Fri, May 15, 2009 at 6:16 AM, Richard Rodseth <[email protected]> > wrote: > > Thanks, Alex. That does work, though the new item is still highlighted > first, so I might be better of using "change", thus covering keyboard > selection as well. > > I saw a Gumbo example on flexexamples using a selectionChanging event, so > it seems as though this use case will be supported in future. > > > > On Thu, May 14, 2009 at 11:53 PM, Alex Harui <[email protected]> wrote: > > > > List/DataGrid don’t use click. They use mouseDown/mouseUp. You can try > blocking those events. > > > > Alex Harui > > Flex SDK Developer > > Adobe Systems Inc. <http://www.adobe.com/> > > Blog: http://blogs.adobe.com/aharui > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Richard Rodseth > *Sent:* Thursday, May 14, 2009 11:29 PM > *To:* [email protected] > *Subject:* [flexcoders] Preventing list selection > > > > > > I need to disallow navigation away from unsaved changes based on the > user's response in an alert. > > I have some application-wide strategies in mind, and I have also seen how I > can prevent tab switching in a tab navigator by registering a capture-phase > click listener and calling stopImmediatePropagation and preventDefault. > > But the same strategy didn't work on a DataGrid, where the grid selection > is used as a form of navigation: > > <mx:DataGrid id="roleList" > creationComplete="onGridCreationComplete(event)" > > private function onGridCreationComplete(event:Event):void { > myGrid.addEventListener(MouseEvent.CLICK, onClickGrid, true, > 10); > > } > private function onClickGrid(event:Event):void { > // alert goes here > event.stopImmediatePropagation(); > event.preventDefault(); > } > > As a workaround I could handle the change event and restore the previous > selection but it would be better to conditionally suppress the selection. > > I've seen the post on Alex's blog, but am hoping for something > listener-based. Thanks. > > > > > > >
