/**
* The Transition Utility provides an API for creating advanced transitions.
* @module node
*/
/**
* Provides the base Transition class, for animating numeric properties.
*
* @module node
* @submodule transition
*/
/**
* A class for constructing animation instances.
* @class Transition
* @for Transition
* @constructor
*/
var END = 'transitionend',
Transition = Y.Transition;
Y.mix(Transition.prototype, {
_start: function() {
if (Transition.useNative) {
this._runNative();
} else {
this._runTimer();
}
},
_runTimer: function() {
this._initAttrs();
Transition._running[Y.stamp(this)] = this;
this._startTime = new Date();
Transition._startTimer();
},
_end: function(finish) {
var duration = this._duration * 1000;
if (finish) { // jump to last frame
this._runAttrs(duration, duration);
}
delete Transition._running[Y.stamp(this)];
this._running = false;
this._startTime = null;
},
_runFrame: function() {
var t = new Date() - this._startTime,
done = (t >= this._totalDuration);
this._runAttrs(t);
if (done) {
this._end();
}
},
_runAttrs: function(time) {
var attr = this._runtimeAttr,
customAttr = Transition.behaviors,
node = this._node,
done = false,
allDone = false,
attribute,
setter,
actualDuration,
elapsed,
d,
t,
i;
for (i in attr) {
if (attr[i].to) {
attribute = attr[i];
d = attribute.duration;
actualDuration = d;
elapsed = time / 1000;
t = time;
setter = (i in customAttr && 'set' in customAttr[i]) ?
customAttr[i].set : Transition.DEFAULT_SETTER;
done = (t >= d);
if (d === 0) { // set instantly
d = t = 1; // avoid dividing by zero in easings
} else if (t > d) {
t = d;
}
if (!this._skip[i]) {
setter(this, i, attribute.from, attribute.to, t, d,
attribute.easing, attribute.unit);
if (done) {
this._skip[i] = true;
this._count--;
if (actualDuration > 0) { // match native behavior which doesnt fire for zero duration
node.fire(END, {
elapsedTime: elapsed,
propertyName: i
});
}
if (!allDone && this._count <= 0) {
allDone = true;
node.fire('transitionsend', {
elapsedTime: elapsed
});
}
}
}
}
}
},
_initAttrs: function() {
var from = {},
to = {},
easing = this._easing,
attr = {},
customAttr = Transition.behaviors,
config = this._config,
duration,
val,
name,
unit, begin, end;
for (name in config) {
val = config[name];
if (!Transition._reKeywords.test(name)) {
duration = this._duration * 1000;
if (typeof val.value !== 'undefined') {
duration = (('duration' in val) ? val.duration : this._duration) * 1000;
easing = val.easing || easing;
val = val.value;
}
if (typeof val === 'function') {
val = val.call(this._node, this._node);
}
begin = (name in customAttr && 'get' in customAttr[name]) ?
customAttr[name].get(this, name) : Transition.DEFAULT_GETTER(this, name);
var mFrom = Transition.RE_UNITS.exec(begin);
var mTo = Transition.RE_UNITS.exec(val);
begin = mFrom ? mFrom[1] : begin;
end = mTo ? mTo[1] : val;
unit = mTo ? mTo[2] : mFrom ? mFrom[2] : ''; // one might be zero TODO: mixed units
if (!unit && Transition.RE_DEFAULT_UNIT.test(name)) {
unit = Transition.DEFAULT_UNIT;
}
if (!begin || !end) {
Y.log('invalid "from" or "to" for "' + name + '"', 'error', 'transition');
return;
}
if (typeof easing === 'string') {
if (easing.indexOf('cubic-bezier') > -1) {
easing = easing.substring(13, easing.length - 1).split(',');
} else if (Transition.easings[easing]) {
easing = Transition.easings[easing];
}
}
attr[name] = {
from: begin,
to: end,
unit: unit,
duration: duration,
easing: easing
};
if (duration > this._totalDuration) {
this._totalDuration = duration;
}
this._count++;
}
}
this._skip = {};
this._runtimeAttr = attr;
},
_getOffset: function(attr) {
var node = this._node,
domNode = node._node,
val = node.getComputedStyle(attr),
position,
offsetParent,
parentOffset,
offset;
if (val === 'auto') {
position = node.getStyle('position');
if (position === 'static' || position === 'relative') {
val = 0;
} else if (domNode.getBoundingClientRect) {
offsetParent = domNode.offsetParent;
parentOffset = offsetParent.getBoundingClientRect()[attr];
offset = domNode.getBoundingClientRect()[attr];
if (attr === 'left' || attr === 'top') {
val = offset - parentOffset;
} else {
val = parentOffset - domNode.getBoundingClientRect()[attr];
}
}
}
return val;
},
destroy: function() {
this.detachAll();
this._node = null;
}
}, true);
Y.mix(Y.Transition, {
/**
* Regex of properties that should use the default unit.
*
* @property RE_DEFAULT_UNIT
* @static
*/
RE_DEFAULT_UNIT: /^width|height|top|right|bottom|left|margin.*|padding.*|border.*$/i,
/**
* The default unit to use with properties that pass the RE_DEFAULT_UNIT test.
*
* @property DEFAULT_UNIT
* @static
*/
DEFAULT_UNIT: 'px',
/**
* Time in milliseconds passed to setInterval for frame processing
*
* @property intervalTime
* @default 20
* @static
*/
intervalTime: 20,
/**
* Bucket for custom getters and setters
*
* @property behaviors
* @static
*/
behaviors: {
left: {
get: function(anim, attr) {
return anim._getOffset(attr);
}
}
},
/**
* The default setter to use when setting object properties.
*
* @property DEFAULT_SETTER
* @static
*/
DEFAULT_SETTER: function(anim, att, from, to, elapsed, duration, fn, unit) {
from = Number(from);
to = Number(to);
var node = anim._node,
val = Transition.cubicBezier(fn, elapsed / duration);
val = from + val[0] * (to - from);
if (att in node._node.style || att in Y.DOM.CUSTOM_STYLES) {
unit = unit || '';
node.setStyle(att, val + unit);
} else if (node._node.attributes[att]) {
node.setAttribute(att, val);
} else {
node.set(att, val);
}
},
/**
* The default getter to use when getting object properties.
*
* @property DEFAULT_GETTER
* @static
*/
DEFAULT_GETTER: function(anim, att) {
var node = anim._node,
val = '';
if (att in node._node.style || att in Y.DOM.CUSTOM_STYLES) {
val = node.getComputedStyle(att);
} else if (node._node.attributes[att]) {
val = node.getAttribute(att);
} else {
val = node.get(att);
}
return val;
},
_startTimer: function() {
if (!Transition._timer) {
Transition._timer = setInterval(Transition._runFrame, Transition.intervalTime);
}
},
_stopTimer: function() {
clearInterval(Transition._timer);
Transition._timer = null;
},
/**
* Called per Interval to handle each animation frame.
* @method _runFrame
* @private
* @static
*/
_runFrame: function() {
var done = true,
anim;
for (anim in Transition._running) {
if (Transition._running[anim]._runFrame) {
done = false;
Transition._running[anim]._runFrame();
}
}
if (done) {
Transition._stopTimer();
}
},
cubicBezier: function(p, t) {
var x0 = 0,
y0 = 0,
x1 = p[0],
y1 = p[1],
x2 = p[2],
y2 = p[3],
x3 = 1,
y3 = 0,
A = x3 - 3 * x2 + 3 * x1 - x0,
B = 3 * x2 - 6 * x1 + 3 * x0,
C = 3 * x1 - 3 * x0,
D = x0,
E = y3 - 3 * y2 + 3 * y1 - y0,
F = 3 * y2 - 6 * y1 + 3 * y0,
G = 3 * y1 - 3 * y0,
H = y0,
x = (((A*t) + B)*t + C)*t + D,
y = (((E*t) + F)*t + G)*t + H;
return [x, y];
},
easings: {
ease: [0.25, 0, 1, 0.25],
linear: [0, 0, 1, 1],
'ease-in': [0.42, 0, 1, 1],
'ease-out': [0, 0, 0.58, 1],
'ease-in-out': [0.42, 0, 0.58, 1]
},
_running: {},
_timer: null,
RE_UNITS: /^(-?\d*\.?\d*){1}(em|ex|px|in|cm|mm|pt|pc|%)*$/
}, true);
Transition.behaviors.top = Transition.behaviors.bottom = Transition.behaviors.right = Transition.behaviors.left;
Y.Transition = Transition;