Working with local triggers

[Tinki3]

I know how to add Actions, Conditions, Events to local triggers, but, I'm not too sure as to how I would refer back to that local trigger.

For example:

function Action_2 takes nothing returns nothing
    //How would I refer back to "trig", in this function? (so that I could do something with targ)
endfunction

function Action_1 takes nothing returns nothing
    local unit targ = GetSpellTargetUnit()
    local trigger trig = CreateTrigger()

    call SetHandleHandle(t, "targ", targ)
    call SetHandleHandle(t, "trig", trig)

    call TriggerRegisterUnitEvent(trig, targ, EVENT_UNIT_DEATH)
    ...
endfunction

Also, would it be neccessary to handle targ with trig ("t" is just an example handle)?

If anyone can help, It'll be greatly appreciated =)

 

[1337D00D]

GetTriggeringTrigger() will return the trigger that has Action_2 in it, assuming that you are adding Action_2 as an action to "trig".

 

[Tinki3]

So you're saying that I need to add an action to trig?

Thx btw.

 

[1337D00D]

Well i'm not too sure. Explain a little more, like what is this trigger for and why do you need to call back to "trig"?.

 

[Tinki3]

> Explain a little more, like what is this trigger for and why do you need to call back to "trig"?

I need to call back to trig, so that I can do something with the unit targ.

Could you maybe give me an example, if you can?

 

[1337D00D]

function whee takes nothing returns nothing
    call GetHandleUnit(GetTriggeringTrigger(),"unit") //Returns the unit stored as "unit" with subject of trigger "t"
endfunction

function Trig_La_Bamba takes nothing returns nothing
    local trigger t = CreateTrigger()
    call SetHandleHandle(t,"unit",BLAH)
    call TriggerRegisterDeathEvent(t,BLAH)
    call TriggerAddAction(t,function whee)
    set t=null
endfunction

 

[Tinki3]

I knew it'd be that simple.

Silly me, why did I bother posting

Thx 1337, if this works, expect +rep

EDIT: It works pefectly, but do I need to remove the added action to prevent any leakage?

 

[Andrewgosu]

Yes, You do. Just store the triggeraction to the local trigger and restore it in the "Action_2" trigger. Or, use the Vexorian method, which uses only conditions instead of triggeractions(few threads below, somewhere). The local trigger needs to be destroyed, also, if You don't need it anymore.

 

[Tinki3]

> Just store the triggeraction to the local trigger and restore it in the "Action_2" trigger

How would I do that?

> The local trigger needs to be destroyed, also, if You don't need it anymore

That I did know

 

[Arkan]

local trigger t=CreateTrigger()
local triggeraction ta=function whatever
call SetHandleHandle(t,"ta",ta)

I think? Never used KaTTaNas...

It would be easier to use a Condition function though, no need to worry about triggeractions.

 

[Tinki3]

Ok, thanks Arkan, I'll try that.

 

[Pyrogasm]

> The local trigger needs to be destroyed, also, if You don't need it anymore

BAD IDEA.

Vexorian and (I believe) IceFrog have shown multiple times that destroying triggers with ActionFuncs is inherently bad, and that destroying triggers with only Events and ConditionFuncs may not be as bad.

It can screw something up with the handle Ids if you destroy a trigger with an ActionFunc, and as such, you shouldn't do it.

Vexorian and IceFrog also ran a few tests to see if triggers without ActionFuncs can be safely destroyed, and he has hesistantly confirmed this in this thread.


EDIT: To store an actionfunc, you would do something like the following:

local trigger T = CreateTrigger()
local triggeraction TA = TriggerAddAction(T, function SomeFunc)
call SetHandleHandle(T, "ActionFunc", TA)
set T = null
set TA = null

 

[Tinki3]

Ok, thanks Pryogasm