// thanks once again to chris coyer for this wonderful snippet
// edited to support touch events
// www.riccardolardi.ch
// http://css-tricks.com/snippets/jquery/draggable-without-jquery-ui
(function($) {
$.fn.drags = function(opt) {
opt = $.extend({
handle:""
}, opt);
if(opt.handle === "") {
var $el = this;
} else {
var $el = this.find(opt.handle);
}
return $el.on("mousedown touchstart", function(e) {
if(opt.handle === "") {
var $drag = $(this).addClass('draggable');
} else {
var $drag = $(this).addClass('active-handle').parent().addClass('draggable');
}
var z_idx = $drag.css('z-index'),
drg_h = $drag.outerHeight(),
drg_w = $drag.outerWidth(),
pos_y = $drag.offset().top + drg_h - e.pageY || $drag.offset().top + drg_h - e.originalEvent.pageY,
pos_x = $drag.offset().left + drg_w - e.pageX || $drag.offset().left + drg_w - e.originalEvent.pageX;
$drag.css('z-index', z_idx).parents().on("mousemove touchmove", function(e) {
$('.draggable').offset({
top: e.pageY + pos_y - drg_h || e.originalEvent.pageY + pos_y - drg_h,
left: e.pageX + pos_x - drg_w || e.originalEvent.pageX + pos_x - drg_w
}).on("mouseup touchend touchcancel", function() {
$(this).removeClass('draggable');
});
});
e.preventDefault();
}).on("mouseup touchend touchcancel", function() {
if(opt.handle === "") {
$(this).removeClass('draggable');
} else {
$(this).removeClass('active-handle').parent().removeClass('draggable');
}
});
}
})(jQuery);