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added animation step threshold...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2013-02-23 04:21:36 +04:00
parent dbea22817a
commit bba739562c
1 changed files with 22 additions and 16 deletions
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38
layout.js
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@ -178,6 +178,7 @@ function handleScrollRelease(evt, data){
var USE_TRANSITIONS_FOR_ANIMATION = false var USE_TRANSITIONS_FOR_ANIMATION = false
var MIN_STEP = 24
var animationFrame = function(){ var animationFrame = function(){
return (window.requestAnimationFrame return (window.requestAnimationFrame
@ -189,6 +190,7 @@ var animationFrame = function(){
}() }()
// XXX make this interruptable...
function animateElementTo(elem, to, duration, easing){ function animateElementTo(elem, to, duration, easing){
// use transition for animation... // use transition for animation...
if(USE_TRANSITIONS_FOR_ANIMATION){ if(USE_TRANSITIONS_FOR_ANIMATION){
@ -212,6 +214,7 @@ function animateElementTo(elem, to, duration, easing){
top: to.top - from.top, top: to.top - from.top,
left: to.left - from.left, left: to.left - from.left,
} }
var prev_t = now
function animate(t){ function animate(t){
/* /*
@ -220,25 +223,28 @@ function animateElementTo(elem, to, duration, easing){
return return
} }
*/ */
// try and not render things too often...
if(t - prev_t > MIN_STEP){
// set position for current step...
if(t < then){
prev_t = t
var rem = then - t
var r = rem/duration
// set position for current step... // this is brain-dead linear spacing...
if(t < then){ // XXX revise...
var rem = then - t var pos = {
var r = rem/duration top: to.top - (dist.top * r),
left: to.left - (dist.left * r),
}
setElementTransform(elem, pos)
// this is brain-dead linear spacing... // finishup the animation...
// XXX revise... } else if(t > then){
var pos = { setElementTransform(elem, to)
top: to.top - (dist.top * r), return
left: to.left - (dist.left * r),
} }
setElementTransform(elem, pos)
// finishup the animation...
} else if(t > then){
setElementTransform(elem, to)
return
} }
// sched next frame... // sched next frame...
animationFrame(animate) animationFrame(animate)