GameTooltip:GetItem() empty name and link

[evilbib]

Hey there,

so some tooltips return empty values (name = "" and link = []) if you use GameTooltip:GetItem(), for example tooltips from the QuestFrame and I believe the TradeSkillFrame.
My interface has item quality border coloring for tooltips but obviously not for said tooltips.

GameTooltip:HookScript('OnTooltipSetItem', function(self)
    local name, item = self:GetItem()
    if (item) then
        local quality = select(3, GetItemInfo(item))
        if (quality) then
            local r, g, b = GetItemQualityColor(quality)
            self:SetBeautyBorderTexture('white')
            self:SetBeautyBorderColor(r, g, b)
        else
            self:SetBeautyBorderTexture('white')
            self:SetBeautyBorderColor(1, 1, 1)
        end
    end
end)

I tried it with this function (this probably works only for quest items though)

name, texture, numItems, quality, isUsable = GetQuestItemInfo("type", index)

but the problem is that I have no idea how to get the index from the item I hover over.
Anyone has an idea how to approach this?

update:
The are six QuestProgressItem buttons according to the QuestFrame.xml, so I just hooked them all.
No idea if this is a good way to do this but it seems to be working.

for i = 1, 6 do 
    local questprog = _G['QuestProgressItem'..i]
    questprog:HookScript('OnEnter', function(self)
        local ID = self:GetID()
        local questitemtype = self.type
        local link = GetQuestItemLink(questitemtype, ID)
        if (link) then
            local quality = select(3, GetItemInfo(link))
            if (quality) then
                local r, g, b = GetItemQualityColor(quality)
                GameTooltip:SetBeautyBorderTexture('white')
                GameTooltip:SetBeautyBorderColor(r, g, b)
            end
        end
    end)
end

update2:
and here for the TradeSkillFrame

if (not TradeSkillFrame) then
    LoadAddOn('Blizzard_TradeSkillUI')
end
for i = 1, 8 do
    local tsr = _G['TradeSkillReagent'..i]
    tsr:HookScript('OnEnter', function(self)
        local ID = self:GetID()
        local skillindex = TradeSkillFrame.selectedSkill
        local link = GetTradeSkillReagentItemLink(skillindex, ID)
        if (link) then
            local quality = select(3, GetItemInfo(link))
            if (quality) then
                local r, g, b = GetItemQualityColor(quality)
                GameTooltip:SetBeautyBorderTexture('white')
                GameTooltip:SetBeautyBorderColor(r, g, b)
            end
        end
    end)
end
hooksecurefunc('TradeSkillItem_OnEnter', function(self)
    local link = GetTradeSkillItemLink(TradeSkillFrame.selectedSkill)
    if (link) then
        local quality = select(3, GetItemInfo(link))
        if (quality) then
            local r, g, b = GetItemQualityColor(quality)
            GameTooltip:SetBeautyBorderTexture('white')
            GameTooltip:SetBeautyBorderColor(r, g, b)
        end
    end
end)

But still I wonder if this is a good way to do it.