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transition.js
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transition.js
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/*
Handles transitions and animations
*/
define(["../xstyle", "../elemental"],function(xstyle, elemental){
var transitions = [];
function propertyChange(event){
if(event.propertyName != "className"){
return;
}
var element = event.srcElement;
var elementTransitions = element._transitions;
var previousStyle = element._previousStyle;
var runtimeStyle = element.runtimeStyle;
var currentStyle = element.currentStyle;
for(var i in previousStyle){
var runtime = runtimeStyle[i];
// runtimeStyle[i] = '';
if(!elementTransitions){
element._transitions = elementTransitions = {};
}
var previous = previousStyle[i];
var current = currentStyle[i];
runtimeStyle[i] = runtime;
if(previous != current && (previous || runtime)){
var currentNum = parseUnits(current);
if(currentNum.units){
var runtimeParsed = parseUnits(runtime);
var toGo = distance(currentNum, runtimeParsed);
var previousParsed = parseUnits(previous);
var total = distance(currentNum, previousParsed);
if(total && toGo && previousParsed.units == currentNum.units){
var transition = elementTransitions[i];
if(transition){
transition.at = 1;
}
var time = time || (currentTime = new Date().getTime());
transition = elementTransitions[i] = {
from: (previous || runtime),
element: element,
to: current,
startTime: time,
duration: element._transitionDuration * toGo / total,
timing: timing[element._transitionTiming || "ease"],
property: i,
t: 0
};
if(!updateTransition(transition)){
// if it doesn't return done, add it to the list of currently executing animations
transitions.push(transition);
}
previousStyle[i] = current;
}
}
}
}
}
var rgb = /^rgba?\(([0-9,]+)\)/i;
var hex = /#([0-9a-f]+)/i;
var units = /([-0-9\.]+)([\w]+)/;
function parseUnits(value){
var match = value.match(rgb);
if(match){
var parts = match[1].split(",");
for(var i = 0; i < 4; i++){
parts[0] = +(parts[0] || 0);
}
}else if(match = value.match(hex)){
match = match[1];
var parts = [];
var shortHex = match.length == 3;
parts[0] = parseInt(match[0] + match[shortHex ? 0 : 1], 16);
parts[1] = parseInt(match[shortHex ? 1 : 2] + match[shortHex ? 1 : 3], 16);
parts[2] = parseInt(match[shortHex ? 2 : 4] + match[shortHex ? 2 : 5], 16);
// parts[3] = parseInt(match[6] ? match[6] + match[7] : 0);
parts.units = "rgb";
return parts;
}else if(match = value.match(units)){
parts = [match[1]];
parts.units = match[2];
return parts;
}else{
return [];
}
parts.units = "rgb";
return parts;
}
function distance(start, end){
var sum = 0;
for(var i = 0; i < start.length; i++){
sum += Math.abs((end[i] || 0) - (start[i] || 0));
}
return sum;
}
function ratio(start, end, completed){
var mid = [];
for(var i = 0; i < start.length; i++){
mid[i] = end[i] * completed - start[i] * (completed - 1);
}
if(start.units == "rgb"){
return "#" + mid[0].toString(16)+mid[1].toString(16)+mid[2].toString(16)+mid[3].toString(16);
}else{
return mid[0] + start.units;
}
}
var transitions = [];
var currentTime = new Date().getTime();
var period = 30;
setInterval(function(){
var lastTime = currentTime;
currentTime = new Date().getTime();
for(var i = 0, l = transitions.length; i < l; i++){
if(updateTransition(transitions[i])){
transitions.splice(i--, 1);
l--;
}
}
}, period);
function updateTransition(transition){
var element = transition.element;
runtimeStyle = element.runtimeStyle;
var t = transition.t = (currentTime - transition.startTime) / 1000 / transition.duration;
if(t >= 1){
// this means the transition is done, remove the runtime styling
runtimeStyle[transition.property] = '';
return true;
}
runtimeStyle[transition.property] = ratio(parseUnits(transition.from), parseUnits(transition.to), transition.timing(transition.t));
}
// these are based on the cubic-bezier functions described by https://developer.mozilla.org/en/CSS/transition-timing-function
var timing = {
ease: cubic(0.25, 0.1, 0.25, 1),
linear: cubic(0, 0, 1, 1),
"ease-in": cubic(0.42, 0, 1, 1),
"ease-out": cubic(0, 0, 0.58, 1),
"ease-in-out": cubic(0.42, 0, 0.58, 1)
};
function cubic(x0, y0, x1, y1){
// this is not a true 2-D cubic bezier, but a reasonable approximation
var p1 = ((y0 + 0.01) / (x0 + 0.01)) / 3;
var p2 = 1 - ((1.01 - y1) / (1.01 - x1)) / 3;
return function(t){
return 3*(1-t)*(1-t)*t*p1 + 3*(1-t)*t*t*p2 + t*t*t;
}
}
function easing(t){
var v = ((x0 - Math.sqrt(x0*x0 + t*(x1-2*x0)))/(2*x0-x1) * 2 / 3 * (1-t) * (1-t) +
((x1-x0 - Math.sqrt((x1-x0)*(x1-x0) + (t-x0)*((1-x0)-2*(x1-x0)))) / (2*(x1-x0)-1+x0) * 2 / 3 + 1/3) * t *t) / ((1-t) * (1-t) + t * t);
var v = (x0-x1 + Math.sqrt((x1-x0)*(x1-x0) - (1+x0-t)*(x0-2*x1)))/(1+x0-t);
return t*t*(1-t)+(1-(1-t)*(1-t))*t;
}
return {
onProperty: function(name, value, rule){
return elemental.addRenderer(name, value, rule, function(element){
var currentStyle = element.currentStyle;
var previousStyle = element._previousStyle = {};
if(name == "transition-duration"){
element._transitionDuration = parseFloat(value);
}
for(var i in currentStyle){
previousStyle[i] = currentStyle[i];
}
element.attachEvent("onpropertychange", propertyChange);
});
}
};
});