Dynamically changing frame position

[drakull]

I want the Pet's frame to be repositioned everytime the player sets/clears focus and also when the pet has/hasn't a target. I hooked some events and tried to determine if there's a focus/pettarget with UnitExists():

-- the function:
lib.updatePetFrame = function(self, event, unit) -- unit is always nil here :(
    local anchor = oUF_drkPlayer
    if event == "PET_ATTACK_START" then
        anchor = oUF_drkPettarget
    elseif event == "PLAYER_FOCUS_CHANGED" then
        if (UnitExits("focus")) then anchor = oUF_drkFocus end
    end
    self:SetPoint("BOTTOMLEFT", anchor,"TOPLEFT", 0, 8)
end
 
-- and inside pet style func:
self:RegisterEvent('PLAYER_FOCUS_CHANGED', lib.updatePetFrame)
self:RegisterEvent('PET_ATTACK_START', lib.updatePetFrame)
self:RegisterEvent('PET_ATTACK_STOP', lib.updatePetFrame)

Problem is that it's not always working when the pet atack starts/stop (sometimes when the pet atack stops the pet frame's anchor does not changes back to the player frame) and is not working at all with the focus thing, i get an error stating that UnitExists is a nil value. Has it been removed? Is there another way to determine if an unitframe is visible?

Oh, and I remember seeing at least one time in chat window: "Interface action failed because of an AddOn".

[haste]

You can only move secure frames (all oUF frames) and frames with secure children out of combat. In other words, you can't really do this.

[drakull]

Ty, haste!

Oh, snap... and there goes my great idea.

Edit: Anyways, i got curious. Is there a way to determine if a unit is visible, ie: to know if the player has or not set a focus?

[Rostok]

UnitExists("focus") maybe.

[drakull]

Yeah, it's UnitExists(), Just noted the typo on the code i posted above...
/facepalm