fc99710658
* Support debug-logging to stderr by defining the MATRIX_EVENTABLE_DEBUG_LOG environment variable. * Support for unhooking handlers from events. * Simplify the low-level interface: eventable.functions() now returns the created functions directly, cutting down on an intermediate table. * A new eventable.object() allows adding :hook(), :unhook() and :fire() methods to any table. Firing events always sends the table itself as first event parameter when firing any event.
74 lines
1.8 KiB
Lua
74 lines
1.8 KiB
Lua
--
|
|
-- eventable.lua
|
|
-- Copyright (C) 2016 Adrian Perez <aperez@igalia.com>
|
|
--
|
|
-- Distributed under terms of the MIT license.
|
|
--
|
|
|
|
local eventable = require "matrix.eventable"
|
|
|
|
do -- Simple event
|
|
local fire, hook = assert(eventable())
|
|
local flag = false
|
|
hook("foo", function () flag = true end)
|
|
fire("foo")
|
|
assert(flag)
|
|
end
|
|
|
|
do -- Stop at first handler that returns some value
|
|
local fire, hook = assert(eventable())
|
|
local flag1, flag2, flag3 = false, false, false
|
|
hook("foo", function () flag1 = true end)
|
|
hook("foo", function () flag2 = true ; return 42 end)
|
|
hook("foo", function () flag3 = true ; return 0 end)
|
|
assert(fire("foo") == 42)
|
|
assert(flag1 == true)
|
|
assert(flag2 == true)
|
|
assert(flag3 == false)
|
|
end
|
|
|
|
do -- Arguments to eventable() are passed to handlers
|
|
local obj = { answer = 42 }
|
|
local fire, hook = assert(eventable(obj))
|
|
hook("foo", function (o)
|
|
assert(o == obj)
|
|
assert(o.answer == 42)
|
|
o.answer = 0 -- Mutate
|
|
end)
|
|
fire("foo")
|
|
assert(obj.answer == 0)
|
|
end
|
|
|
|
do -- Multiple arguments passed to eventable
|
|
local fire, hook = assert(eventable(42, "bar", nil, { v=10 }))
|
|
hook("foo", function (a, s, n, o)
|
|
assert(a == 42)
|
|
assert(s == "bar")
|
|
assert(n == nil)
|
|
assert(o.v == 10)
|
|
end)
|
|
fire("foo")
|
|
end
|
|
|
|
do -- Unhooking should work
|
|
local flag1, flag2 = false, false
|
|
local h1 = function () flag1 = true end
|
|
local h2 = function () flag2 = true end
|
|
|
|
local fire, hook, unhook = assert(eventable())
|
|
hook("foo", h1)
|
|
hook("foo", h2)
|
|
fire("foo")
|
|
assert(flag1 == true)
|
|
assert(flag2 == true)
|
|
|
|
flag1, flag2 = false, false
|
|
unhook("foo", h2)
|
|
fire("foo")
|
|
assert(flag1 == true)
|
|
assert(flag2 == false)
|
|
|
|
flag1, flag2 = false, false
|
|
unhook("foo")
|
|
end
|