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TransitionIcon.prototype.triggerAnimation = function(timestamp) { | |
var progress = this.getProgress(timestamp); | |
this.animateIcon(progress); | |
this.checkProgress(progress); | |
}; | |
TransitionIcon.prototype.getProgress = function(timestamp) { | |
//make sure the progress value is in the right interval | |
if (!this.time.start) this.time.start = timestamp; | |
return timestamp - this.time.start; | |
}; | |
TransitionIcon.prototype.checkProgress = function(progress) { | |
//check if animation is complete | |
var self = this; | |
if (this.time.total > progress) { | |
//animation is not over -> start new animation loop | |
window.requestAnimationFrame(self.triggerAnimation.bind(self)); | |
} else { | |
//animation is over -> update object properties + group aria attributes | |
this.status = {interacted : !this.status.interacted, animating : false}; | |
this.time.start= null; | |
var index = getStatusIndex(this.status.interacted); | |
this.states[index[0]].removeAttribute('aria-hidden'); | |
this.states[index[1]].setAttribute('aria-hidden', 'true'); | |
} | |
}; | |
TransitionIcon.prototype.animateIcon = function(progress) { | |
if(progress > this.time.total) progress = this.time.total; | |
if(0 > progress) progress = 0; | |
var index = getStatusIndex(this.status.interacted); | |
//update group visibility | |
this.states[index[0]].style.display = (progress > this.time.total/2) ? "none" : "block"; | |
this.states[index[1]].style.display = (progress > this.time.total/2) ? "block" : "none"; | |
//scale group elements | |
this.scaleIcon(progress, index[0], index[1]); | |
} | |
TransitionIcon.prototype.scaleIcon = function(progress, i, j) { | |
var scale1 = ncEaseInOutQuart(Math.min(progress, this.time.total/2), 1, -0.2, this.time.total/2).toFixed(2), | |
scale2 = ncEaseInOutQuart(Math.max(progress - this.time.total/2, 0), 0.2, -0.2, this.time.total/2).toFixed(2); | |
this.states[i].setAttribute('transform', 'translate('+this.size.width*(1 - scale1)/2+' '+this.size.height*(1 - scale1)/2+') scale('+ scale1 +')'); | |
this.states[j].setAttribute('transform', 'translate('+this.size.width*scale2/2+' '+this.size.height*scale2/2+') scale('+ (1 - scale2) +')'); | |
}; |
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