[FLEX-24213] Unable to force Tree Item Renderer to Update Display During a Drag and Drop

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 4.0 (Release)
• Component/s: mx: Tree
• Environment: Affected OS(s): Mac; Affected OS(s): Mac OS 10.6; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 13/Jun/10 22:16
• Updated: 13/Jun/10 22:18

Description

See this post for ongoing discussion,
http://stackoverflow.com/questions/3026298/how-can-i-force-a-tree-itemrenderer-to-redraw-during-a-drag-and-drop-operation

and this post for background,
http://forums.adobe.com/message/2091088

Steps to reproduce:
1. Declare an mx tree with dragEnabled, dropEnabled, and dragMoveEnabled set to true
2. Declare an itemRenderer and override getCurrentRendererState method which appends 'AndDragOver' to the state. This is 'best practice' as described by the skin/component contract in Flex 4 help docs and is specifically discussed in this post http://forums.adobe.com/message/2091088 between Deepa Subramaniaman and Dave Cragg.
3. During drag over event in tree, try to force the itemRenderer to redraw itself using validateNow, invalidateDisplay, invalidateSize, invalidateLayout, and tree.invalidateList (this should trigger a call to the itemRenderer's getCurrentRendererState method

Actual Results:
Item Renderer does not update its display. getCurrentRendererState is never called

Expected Results:
Item Renderer should refresh its display.

Workaround (if any):
Set the item renderer's currentState property directly.