Lua Event for Target of target Change, Nameplate addon

[grog162]

TL/DR
I am looking for a Lua:Event that gets triggered when Target of target changes.

What am I trying to achieve?
I am making a UI that has no Unit Frames (edit: or action bars), only Nameplates. All the functionality I can get with WA and Nameplate addons. The only thing I'm missing is a Target of target indicator on my Target's nameplate.

What have I tried so far?
I have written a small addon that does show Target of target correctly. But it doesn't update whenever Target of target changes. I couldn't find the event that gets triggered by tot-change on Wowpedia or the forums.
Here's the code I've got so far:

local npToT = CreateFrame("Frame", NameplateToT, UIParent);
local font = "Interface\\Addons\\NameplateTargetOfTarget\\Rubik-Medium.ttf";
 
npToT.text = npToT:CreateFontString(nil, "OVERLAY");
 
local function npToT_EventHandler(self, event, ...)
    self.text:ClearAllPoints();
    if (C_NamePlate.GetNamePlateForUnit("target") and UnitExists("targettarget")) then
        local targetnameplate = C_NamePlate.GetNamePlateForUnit("target");
        self.text:Show();
        self.text:SetSize(100, 20);
        self.text:SetFont(font, 12, "OUTLINE");
        self.text:SetFormattedText(UnitName("targettarget"))
        self.text:SetPoint("CENTER", targetnameplate, "CENTER", -40, -10);
    else
        self.text:Hide();
    end
end
 
npToT:SetScript("OnEvent", npToT_EventHandler);
 
-- Which events do I need to add here?
npToT:RegisterEvent("ADDON_LOADED");
npToT:RegisterEvent("PLAYER_ENTERING_WORLD");
npToT:RegisterEvent("PLAYER_TARGET_CHANGED");

It would be nice to work both in and out of combat, for friendly and hostile targets.

What are some alternative solutions to the problem?
I know Plater can show target of a unit when casting, but I'd like to have it show tot at all times.

TL/DR at the top of the post.

[Fizzlemizz]

UNIT_TARGET

local npToT = CreateFrame("Frame", nil, UIParent);
local font = "Interface\\Addons\\NameplateTargetOfTarget\\Rubik-Medium.ttf";
npToT.text = npToT:CreateFontString(nil, "OVERLAY");
npToT.text:SetFont(font, 12, "OUTLINE"); -- Only need to set the font once
-- npToT.Text will automatically resize to fit text
 
local function npToT_EventHandler(self, event, ...)
    if not UnitExists("targettarget") then
        self.text:Hide();
        return
    end
    local unit = ...
    if not unit == "target" then
        return
    end
    self.text:SetFormattedText(UnitName("targettarget"))
    self.text:ClearAllPoints();
    self.text:SetPoint("CENTER", C_NamePlate.GetNamePlateForUnit("target"), "CENTER", -40, -10);
    self.text:Show();
end
 
npToT:SetScript("OnEvent", npToT_EventHandler);
 
npToT:RegisterEvent("PLAYER_ENTERING_WORLD");
npToT:RegisterEvent("UNIT_TARGET");

[grog162]

Originally Posted by Fizzlemizz UNIT_TARGET

I should have checked it. Noted. Thank you.
The text on wiki is misleading.

Fired when the target of yourself, raid, and party members change ... Should also work for 'pet' and 'focus'. This event only fires when the triggering unit is within the player's visual range.

It makes no mention of Target of target change, that's why I dismissed it.

Anyway, for the sake of completeness, here's the code I landed on.

local npToT = CreateFrame("Frame", nil, UIParent);
local font = "Interface\\Addons\\NameplateTargetOfTarget\\Rubik-Medium.ttf";
npToT.text = npToT:CreateFontString(nil, "OVERLAY");
npToT.text:SetFont(font, 12, "OUTLINE"); -- Only need to set the font once
-- npToT.Text will automatically resize to fit text
 
local function npToT_EventHandler(self, event, ...)
    if not UnitExists("targettarget") then
        self.text:Hide();
        return
    end
    local unit = ...
    if not unit == "target" then
        return
    end
    if not C_NamePlate.GetNamePlateForUnit("target") then
        -- If player target doesn't have nameplate showing, the text shows at the center of the screen
        self.text:Hide(); -- or displayes it on other nameplates, if target is behind you, for example.
        return
    end
    if UnitIsPlayer("targettarget") then
        local _, totclassfile = UnitClass("targettarget");
        local _, _, _, totclasscolor = GetClassColor(totclassfile);
        self.text:SetFormattedText("\124c%s%s\124r", totclasscolor, UnitName("targettarget"));
        -- Makes the names of player units class colored.
    else
        self.text:SetFormattedText(UnitName("targettarget"));
    end
    self.text:ClearAllPoints();
    self.text:SetPoint("CENTER", C_NamePlate.GetNamePlateForUnit("target"), "CENTER", -40, -10);
    self.text:Show();
end
 
npToT:SetScript("OnEvent", npToT_EventHandler);
 
npToT:RegisterEvent("PLAYER_ENTERING_WORLD");
npToT:RegisterEvent("PLAYER_TARGET_CHANGED");
npToT:RegisterEvent("UNIT_TARGET");
npToT:RegisterEvent("NAME_PLATE_UNIT_ADDED");

I had a delay when I was changing targets, so I put back PLAYER_TARGET_CHANGED.
NAME_PLATE_UNIT_ADDED is for when target nameplate appears as you target a unit or after.

Btw, I don't know how to get a specific output from a function that outputs multiple values. If someone could tell me the syntax for that, it would be much appreciated.

[Fizzlemizz]

Any event starting with UNIT_ should work for any valid unitid.

Originally Posted by grog162 Btw, I don't know how to get a specific output from a function that outputs multiple values. If someone could tell me the syntax for that, it would be much appreciated.

local arg1, arg2, arg3 = SomeFuncWith3Returns()
-- get all returns

local _, _, arg3 = SomeFuncWith3Returns()
-- get 3rd return

local retVal = select(2, SomeFuncWith3Returns())
-- get 2nd return (same but different to no.2 (will actually return 2 AND any others)

[grog162]

Originally Posted by Fizzlemizz Any event starting with UNIT_ should work for any valid unitid.

I thought that as well, but it had a delay for whatever reason.

Thank you for all the help.