Bug: 2.1.2 isUsableSpell() not fixed

by Drome | 09/07/2007 17:32:46
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Drome

This is especially annoying creating buttons targeted to a unit with spells Power Word: Shield (PWS) and Blessing of Protection (BOP) in eXtremeUnitButtons.

The Issue: For some spells IsUsableSpell returns nil if the "Target" is not valid. This is not consistent across all spells but is true for PWS and BOP. In the end I will have many buttons that cast a spell against their assigned unit which is usually not the "Target" and i need some way of knowing if the spell is castable.

example: 

myUsable, myNoMana = IsUsableSpell("Power Word: Shield");


returns

myUsable = 1 when no target, or when a party member is targeted; and nil when an NPC or non-party member is selected.

Other Spells in game do not exhibit this reliance on the "Target" for IsSpellUsable. For example "Lesser Heal" returns myUsable = 1 no matter what is targeted (party, NPC, NPC for other Faction).

I created a simple addon with the following functions; then create a macro that calls IUS_test_all().

function IUS_test_all()
   myClass = UnitClass("Player");
   if myClass == "Priest" then
      IUS_TestSpell("Power Word: Shield");
      IUS_TestSpell("Lesser Heal");
   elseif myClass == "Paladin" then
      IUS_TestSpell("Blessing of Protection");
      IUS_TestSpell("Holy Light");
      IUS_TestSpell("Holy Shock");
   end
   DEFAULT_CHAT_FRAME:AddMessage(" ");
end


function IUS_TestSpell(mySpell)
   local myUsable;
   local myNoMana;
   myUsable, myNoMana = IsUsableSpell(mySpell);
   if myUsable == nil then myUsable = "nil" end;
   if myNoMana == nil then myNoMana = "nil" end;
   DEFAULT_CHAT_FRAME:AddMessage("  For " .. mySpell .. " myUsable = " .. myUsable .. ", myNoMana = " .. myNoMana);
end

by Slouken | 09/07/2007 18:19:45
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Slouken

This is by design, because of the special target state requirements for the spell.

by Slouken | 09/07/2007 19:08:12
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Slouken

You should be passing the target in, and it will work properly. (or if it doesn't now, it does in 2.2)

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