WoWInterface - Updating tooltip while tooltip is still active.

If you want your addon to work together with other addons which also modifies the tooltips,
you might need to be a little more sophisticated around how you modify your lines.
You will not always know which lines are yours. And clearing the entire tooltip will end up clearing more than you want too...

Here is the approach I ended up using:

Code:

local cachedUnit = nil



function OnTooltipSetUnit()

        --Figure out if we are reading data from mouseover or target

        local unit = "mouseover"

        if (not UnitExists(unit)) then

                unit = "target"

        end



        --Cache unit so that we can run it again later with the same unit

        cachedUnit = unit

        AppendCustomTooltipLines()

end



function AppendCustomTooltipLines()

        --Add custom lines here with custom color

        local r = 1

        local g = 1

        local b = 1

        GameTooltip:AddLine("Custom text here...", r, g, b)

end



function UpdateTooltip()

        if cachedUnit == nil then return end



        --Makes sure custom tooltip lines are cleared

        GameTooltip:SetUnit(cachedUnit)

end



GameTooltip:HookScript("OnTooltipSetUnit", OnTooltipSetUnit)

You may then call UpdateTooltip() wherever, when you know there is new data to apply.