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reference:scripting_reference:scripting_objects:listeruichangedata

If a script add-in implements the OnListerUIChange event, the method receives a ListerUIChangeData object when various user interface elements are opened or closed in a Lister.

Property Name Return Type Description

change

string

Returns a string indicating which UI element changed. This will equal one of the following strings: dual, tree, metapane, viewer, utility, duallayout, metapanelayout, viewerlayout, toolbars, toolbarset, toolbarsauto, minmax.

lister

object:Lister 

Returns a Lister object representing the Lister that is changing.

qualifiers

string

Returns a string indicating any qualifier keys that were held down by the user when the event was triggered.
The string can contain any or all of the following: shift ctrl, alt, lwin, rwin
If no qualifiers were down, the string will be: none