Created
January 17, 2012 20:53
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var anim_hz = 30; | |
function AnimHandle(complete, callback) | |
{ | |
// No parameter ensures the handle represents a completed animation | |
this.Complete = complete == null ? true : complete; | |
this.Callback = callback; | |
} | |
function AnimateUpdate(handle) | |
{ | |
// Linear step the value and pass to the animation function | |
handle.AnimFunc(handle.Value); | |
handle.Value += handle.ValueInc; | |
if (Math.abs(handle.Value - handle.End) > 0.01) | |
{ | |
window.setTimeout(handle.AnimUpdate, 1000 / anim_hz); | |
} | |
else | |
{ | |
// Upon completion issue one final animation function call with the end value | |
handle.AnimFunc(handle.End); | |
handle.Complete = true; | |
} | |
if (handle.Callback) | |
handle.Callback(handle.Complete); | |
} | |
function Animate(anim_func, start, end, time, callback) | |
{ | |
// Create a new animation handle | |
var handle = new AnimHandle(false, callback); | |
handle.Start = start; | |
handle.End = end; | |
handle.ValueInc = (end - start) / (time * anim_hz); | |
handle.Value = start; | |
// Cache the update function to prevent recreating the closure | |
handle.AnimFunc = anim_func; | |
handle.AnimUpdate = function() { AnimateUpdate(handle); }; | |
// Call for the start value | |
handle.AnimUpdate(); | |
return handle; | |
} | |
/// USE | |
this.AnimHandle = Animate( | |
function (val) { item.ChildrenNode.style.height = val; }, | |
item.ChildrenNode.offsetHeight, 0, 0.2); |
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