Icon Feature LUA Help

[unlimit]

I'm trying to create an Icon Feature in RDX, but I don't really understand how to get it to work. I got it to work a little bit earlier, by making

btn._t:SetTexture("Interface\\InventoryItems\\WoWUnknownItem01.blp");

into

btn._t:SetTexture(prioicon);

However, that only worked a little bit... meaning, it wouldn't update itself in combat, it would ONLY show Kill Command.

RDX.RegisterFeature({
    name = "BM Priority Icon";
    title = VFLI.i18n("Icon BM Priority");
    category = VFLI.i18n("Textures");
    test = true;
    IsPossible = function(state)
        if not state:Slot("DesignFrame") then return nil; end
        if not state:Slot("Base") then return nil; end
        return true;
    end;
    ExposeFeature = function(desc, state, errs)
        if not RDXUI.DescriptorCheck(desc, state, errs) then return nil; end
        if desc.owner == "Base" then desc.owner = "decor"; end
        local flg = true;
        flg = flg and RDXUI.UFFrameCheck_Proto("Frame_", desc, state, errs);
        flg = flg and RDXUI.UFAnchorCheck(desc.anchor, state, errs);
        flg = flg and RDXUI.UFOwnerCheck(desc.owner, state, errs);
        if flg then state:AddSlot("Frame_" .. desc.name); end
        return flg;
    end;
    ApplyFeature = function(desc, state)
        local objname = "Frame_" .. desc.name;
        local ebsflag, ebs, ebsos = "false", "bs_default", 0;
        if desc.externalButtonSkin then
            ebsflag = "true";
            ebs = desc.externalButtonSkin;
            if desc.ButtonSkinOffset then ebsos = desc.ButtonSkinOffset; end
        end
      ------------------ On frame creation
        local createCode = [[
function IconBMPriority()
local gcd = 1.5
 
if not UnitCanAttack("player", "target") then
    return
end
 
local level = UnitLevel("player")
 
local inRange = 0
local unit = "target"
if UnitExists(unit) and UnitIsVisible(unit) then
   inRange = IsSpellInRange("Kill Command",unit)
end
 
local focus = UnitPower("player")
local duration, _
 
-- 1. If your pet is on the target, Kill Command
if inRange == 1 and focus > 50 then
    _, duration = GetSpellCooldown("Kill Command")
    if duration <= gcd then
        return GetSpellTexture("Kill Command")
    end
end
 
-- 2. If the mob is going to live long enough, apply Serpent Sting.
if focus > 35 then
    _, duration = GetSpellCooldown("Serpent Sting")
    if duration <= gcd then
        return GetSpellTexture("Serpent Sting")
    end
end
 
-- 3. If mob is below 20% health, Kill Shot
_, duration = GetSpellCooldown("Kill Shot")
if duration <= gcd and ( UnitHealth("target") / UnitHealthMax("target") < 0.2 ) then
    return GetSpellTexture("Kill Shot")
end
 
-- 4. If you will have enough focus to use Explosive Shot and Black Arrow, use Arcane Shot
if focus > 85 then
    return GetSpellTexture("Arcane Shot")
end
 
-- 5. Cobra Shot (or Steady Shot)
if level < 81 then
    return GetSpellTexture("Steady Shot")
else
    return GetSpellTexture("Cobra Shot")
end
end
 
prioicon = IconBMPriority();        
 
local btn, owner = nil, ]] .. RDXUI.ResolveFrameReference(desc.owner) .. [[;
if ]] .. ebsflag .. [[ then 
    btn = VFLUI.SkinButton:new();
    btn:SetButtonSkin("]] .. ebs ..[[", true, true, false, true, true, true, false, true, true, true);
else
    btn = VFLUI.AcquireFrame("Frame");
end
btn:SetParent(owner);
btn:SetFrameLevel(owner:GetFrameLevel());
btn:SetPoint(]] .. RDXUI.AnchorCodeFromDescriptor(desc.anchor) .. [[);
btn:SetWidth(]] .. desc.w .. [[); btn:SetHeight(]] .. desc.h .. [[);
btn._t = VFLUI.CreateTexture(btn);
btn._t:SetDrawLayer("]] .. (desc.drawLayer or "ARTWORK") .. [[", 2);
btn._t:SetPoint("CENTER", btn, "CENTER");
btn._t:SetWidth(]] .. desc.w .. [[ - ]] .. ebsos .. [[); btn._t:SetHeight(]] .. desc.h .. [[ - ]] .. ebsos .. [[);
btn._t:SetVertexColor(1,1,1,1);
btn._t:SetTexture("Interface\\InventoryItems\\WoWUnknownItem01.blp");
btn._t:Show();
btn:Hide();
frame.]] .. objname .. [[ = btn;
]];
        state:Attach(state:Slot("EmitCreate"), true, function(code) code:AppendCode(createCode); end);
 
        ------------------ On frame destruction.
        state:Attach(state:Slot("EmitDestroy"), true, function(code) code:AppendCode([[
VFLUI.ReleaseRegion(frame.]] .. objname .. [[._t); frame.]] .. objname .. [[._t = nil;
frame.]] .. objname .. [[:Destroy(); frame.]] .. objname .. [[ = nil;
]]); end);
        state:Attach(state:Slot("EmitCleanup"), true, function(code) code:AppendCode([[
frame.]] .. objname .. [[:Hide();
]]); end);
 
        ------------------ On paint.
        state:Attach(state:Slot("EmitPaint"), true, function(code) 
        if desc.test then
            code:AppendCode([[
frame.]] .. objname .. [[:Show();
]]);
        else
            code:AppendCode([[
frame.]] .. objname .. [[._t:SetTexture(prioicon);
if UnitClass("player") = hunter then
    frame.]] .. objname .. [[:Hide();
else
    frame.]] .. objname .. [[:Show();
end;
]]);
        end
        end);
        return true;
    end;
    UIFromDescriptor = function(desc, parent, state)
        local ui = VFLUI.CompoundFrame:new(parent);
        
        -- Name/width/height
        local ed_name, ed_width, ed_height = RDXUI.GenNameWidthHeightPortion(ui, desc, state);
        
        -- Owner
        local owner = RDXUI.MakeSlotSelectorDropdown(ui, VFLI.i18n("Owner"), state, "Subframe_");
        if desc and desc.owner then owner:SetSelection(desc.owner); end
        
        -- Drawlayer
        local er = VFLUI.EmbedRight(ui, VFLI.i18n("Draw layer"));
        local drawLayer = VFLUI.Dropdown:new(er, RDXUI.DrawLayerDropdownFunction);
        drawLayer:SetWidth(100); drawLayer:Show();
        if desc and desc.drawLayer then drawLayer:SetSelection(desc.drawLayer); else drawLayer:SetSelection("ARTWORK"); end
        er:EmbedChild(drawLayer); er:Show();
        ui:InsertFrame(er);
        
        -- Anchor
        local anchor = RDXUI.UnitFrameAnchorSelector:new(ui); anchor:Show();
        anchor:SetAFArray(RDXUI.ComposeAnchorList(state));
        if desc and desc.anchor then anchor:SetAnchorInfo(desc.anchor); end
        ui:InsertFrame(anchor);
        
        local chk_bs = VFLUI.CheckEmbedRight(ui, VFLI.i18n("Use Button Skin"));
        local dd_buttonSkin = VFLUI.Dropdown:new(chk_bs, VFLUI.GetButtonSkinList);
        dd_buttonSkin:SetWidth(150); dd_buttonSkin:Show();
        if desc and desc.externalButtonSkin then
            chk_bs:SetChecked(true);
            dd_buttonSkin:SetSelection(desc.externalButtonSkin); 
        else
            chk_bs:SetChecked();
            dd_buttonSkin:SetSelection("bs_default");
        end
        chk_bs:EmbedChild(dd_buttonSkin); chk_bs:Show();
        ui:InsertFrame(chk_bs);
        
        local ed_bs = VFLUI.LabeledEdit:new(ui, 50); ed_bs:Show();
        ed_bs:SetText(VFLI.i18n("Button Skin Size Offset"));
        if desc and desc.ButtonSkinOffset then ed_bs.editBox:SetText(desc.ButtonSkinOffset); end
        ui:InsertFrame(ed_bs);
        
        function ui:GetDescriptor()
        local name = ed_name.editBox:GetText();
        local ebs = nil;
        if chk_bs:GetChecked() then ebs = dd_buttonSkin:GetSelection(); end
        return {
            feature = "BM Priority Icon", name = name, owner = owner:GetSelection();
            drawLayer = drawLayer:GetSelection();
            w = ed_width:GetSelection();
            h = ed_height:GetSelection();
            anchor = anchor:GetAnchorInfo();
            externalButtonSkin = ebs;
            ButtonSkinOffset = VFL.clamp(ed_bs.editBox:GetNumber(), 0, 50);
        };
        end
        
        return ui;
    end;
    CreateDescriptor = function()
        return {
            feature = "BM Priority Icon", name = "bmpi", owner = "decor", drawLayer = "ARTWORK";
            w = 14; h = 14;
            anchor = { lp = "TOPLEFT", af = "Base", rp = "TOPLEFT", dx = 0, dy = 0};
            ButtonSkinOffset = 5;
        };
    end;
});