FilmSlider.prototype.touchStartHandler = function(evt) {
this.filmStartX = parseInt(this.film.style.left, 10);
this.touchStartX = evt.changedTouches[0].screenX;
+ this.touchStartTime = (new Date()).getTime();
};
FilmSlider.prototype.touchMoveHandler = function(evt) {
var delta = this.touchStartX - evt.changedTouches[0].screenX;
var posX = this.filmStartX - delta;
this.setFilmPosition(posX);
+ this.lastMoveTime = (new Date()).getTime();
};
FilmSlider.prototype.touchEndHandler = function(evt) {
- if (evt.changedTouches[0].screenX !== this.touchStartX) {
+ var x = evt.changedTouches[0].screenX;
+ var delta = x - this.touchStartX;
+ if (delta) {
disableDefault(evt);
+ var now = (new Date()).getTime();
+ if (now - this.lastMoveTime < 100) {
+ // au delà de 100 ms de maintient, on annule l'inertie
+ var speed = delta / (now - this.touchStartTime)
+ var x0 = parseInt(this.film.style.left, 10);
+ var t0 = (new Date()).getTime();
+ var d = 500; // milisecondes
+ var delta = 0;
+ var dt = 25
+ var self = this;
+
+ function animate() {
+ // inertie
+ var t = (new Date()).getTime() - t0;
+ if (t < d) {
+ setTimeout(animate, dt);
+ delta = delta + (1-t/d) * speed * dt; // décelleration linéaire
+ self.setFilmPosition(x0 + delta);
+ }
+ }
+ animate();
+ }
}
this.touchStartX = undefined;
};