/*
* L.PosAnimation is used by Leaflet internally for pan animations.
*/
L.PosAnimation = L.Class.extend({
includes: L.Mixin.Events,
run: function (el, newPos, duration, easeLinearity) { // (HTMLElement, Point[, Number, Number])
this.stop();
this._el = el;
this._inProgress = true;
this.fire('start');
el.style[L.DomUtil.TRANSITION] = 'all ' + (duration || 0.25) +
's cubic-bezier(0,0,' + (easeLinearity || 0.5) + ',1)';
L.DomEvent.on(el, L.DomUtil.TRANSITION_END, this._onTransitionEnd, this);
L.DomUtil.setPosition(el, newPos);
// toggle reflow, Chrome flickers for some reason if you don't do this
L.Util.falseFn(el.offsetWidth);
// there's no native way to track value updates of transitioned properties, so we imitate this
this._stepTimer = setInterval(L.bind(this.fire, this, 'step'), 50);
},
stop: function () {
if (!this._inProgress) { return; }
// if we just removed the transition property, the element would jump to its final position,
// so we need to make it stay at the current position
L.DomUtil.setPosition(this._el, this._getPos());
this._onTransitionEnd();
L.Util.falseFn(this._el.offsetWidth); // force reflow in case we are about to start a new animation
},
// you can't easily get intermediate values of properties animated with CSS3 Transitions,
// we need to parse computed style (in case of transform it returns matrix string)
_transformRe: /(-?[\d\.]+), (-?[\d\.]+)\)/,
_getPos: function () {
var left, top, matches,
el = this._el,
style = window.getComputedStyle(el);
if (L.Browser.any3d) {
matches = style[L.DomUtil.TRANSFORM].match(this._transformRe);
left = parseFloat(matches[1]);
top = parseFloat(matches[2]);
} else {
left = parseFloat(style.left);
top = parseFloat(style.top);
}
return new L.Point(left, top, true);
},
_onTransitionEnd: function () {
L.DomEvent.off(this._el, L.DomUtil.TRANSITION_END, this._onTransitionEnd, this);
if (!this._inProgress) { return; }
this._inProgress = false;
this._el.style[L.DomUtil.TRANSITION] = '';
clearInterval(this._stepTimer);
this.fire('step').fire('end');
}
});
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