Trouble with ListView

Hey folks,   I’m trying to add a select all button for a list view that can be filtered by the user. The issue here is that the select all button should only apply to what the viewer is seeing at any given time. Does anyone know of any way to do this? Every new idea I have ends up failing in my head after giving it a little more thought, so I would really appreciate any sage advice that comes my way.   Thanks in advance, Austin 
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