I have an event handler, but there is no reference to the player or his inventory in event.

How to get what item the player is holding from the handler that does not have a link to the inventory?

player its player🤷‍♂️
 

@SubscribeEvent*/
	public static void renderEnergy(RenderGameOverlayEvent.Post event)
    {	
		if( in the hands of the required item ){
			Minecraft.getInstance().fontRenderer.drawString(event.getMatrixStack(), "TEXT", event.getWindow().getScaledWidth()-10, event.getWindow().getScaledHeight()-2, 255);
        }
    }