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param.js
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param.js
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var Value = require('mutant/value')
var doubleBind = require('lib/double-bind')
var computed = require('mutant/computed')
var resolveNode = require('lib/resolve-node')
var getValue = require('lib/get-value')
var watch = require('mutant/watch')
module.exports = Param
function Param (parentContext, defaultValue) {
var obs = Value(defaultValue, { defaultValue })
obs.nodeName = computed([obs], x => x && x.node || false)
var lastTrigger = null
var context = Object.create(parentContext)
context.param = obs
obs.context = context
obs.node = null
var releases = []
var releaseNode = watch(obs.nodeName, function (nodeName) {
var ctor = resolveNode(context.nodes, nodeName)
// clean up last
obs.node = null
while (releases.length) {
releases.pop()()
}
if (ctor) {
var instance = ctor(context)
releases.push(doubleBind(obs, instance))
if (lastTrigger && instance.triggerOn) {
instance.triggerOn(lastTrigger)
}
if (instance.destroy) {
releases.push(instance.destroy)
}
obs.node = instance
}
})
obs.currentValue = computed([obs.nodeName], function (nodeName) {
if (obs.node) {
return obs.node.currentValue
} else {
return computed([obs, defaultValue], getValue, {nextTick: true})
}
})
obs.getValueAtTime = function (time) {
var value = obs.currentValue()
if (typeof value === 'number') {
return value
} else if (value.getValueAtTime) {
return value.getValueAtTime(time)
} else {
return 0
}
}
obs.triggerOn = function (at) {
at = Math.max(context.audio.currentTime, at || 0)
lastTrigger = at
return obs.node && obs.node.triggerOn && obs.node.triggerOn(at) || 0
}
obs.triggerOff = function (at) {
at = Math.max(context.audio.currentTime, at || 0)
lastTrigger = null
return obs.node && obs.node.triggerOff && obs.node.triggerOff(at) || 0
}
obs.getAttackDuration = function () {
return obs.node && obs.node.getAttackDuration && obs.node.getAttackDuration() || 0
}
obs.getReleaseDuration = function () {
return obs.node && obs.node.getReleaseDuration && obs.node.getReleaseDuration() || 0
}
obs.destroy = function () {
releaseNode()
while (releases.length) {
releases.pop()()
}
}
return obs
}
Param.triggerOn = function (obj, at) {
for (var k in obj) {
if (obj[k] && k !== 'templateSlot' && obj[k].triggerOn) {
obj[k].triggerOn(at)
}
}
}
Param.triggerOff = function (obj, stopAt) {
for (var k in obj) {
if (obj[k] && k !== 'templateSlot' && obj[k].triggerOff) {
var release = obj[k].getReleaseDuration && obj[k].getReleaseDuration() || 0
obj[k].triggerOff(stopAt - release)
}
}
}
Param.getAttackDuration = function (obj) {
var result = 0
for (var k in obj) {
if (obj[k] && obj[k].getAttackDuration) {
var val = obj[k].getAttackDuration()
if (val > result) {
result = val
}
}
}
return result
}
Param.getReleaseDuration = function (obj) {
var result = 0
for (var k in obj) {
if (obj[k] && obj[k].getReleaseDuration) {
var val = obj[k].getReleaseDuration()
if (val > result) {
result = val
}
}
}
return result
}
Param.destroy = function (obj) {
Object.keys(obj).forEach(function (key) {
if (obj[key] && typeof obj[key].destroy === 'function') {
obj[key].destroy()
}
})
}