// This was taken from //webclient.

/**
 * jQuery plug-in.
 */
(function($) {

    /**
     * IE9 does not support touch events, only mouse events. We need to adjust appropriately.
     * Also, some methods for getting the right target and right coordinates of the event.
     */
    var touch = ("ontouchstart" in document.body);
    $.touchEvents = {
        isTouch: touch,
        start:  (touch) ? "touchstart" : "mousedown",
        move:   (touch) ? "touchmove" : "mousemove",
        end:    (touch) ? "touchend" : "mouseup mouseout",
        endOnly:(touch) ? "touchend touchcancel" : "mouseup",
        cancel: (touch) ? "touchend touchcancel touchmove" : "mouseup mousemove mouseout",
        getTarget: function(e) {
            return touch ?
                $(e.originalEvent.touches[0].target) :
                $(e.target);
        },
        getCoord: function(e) {
            // e.originalEvent is necessary because you are using jQuery.
            return touch ?
                {x: e.originalEvent.touches[0].pageX, y: e.originalEvent.touches[0].pageY} :
                {x: e.pageX, y: e.pageY};
        }
    };

    /**
     * Make the provided elements "pressable" (give them a press state when touched). If
     * the element has a class token of "disabled", then the press effect will not
     * be applied.
     *
     * DO NOT use pressable() to emulate list selection behavior. It won't work when
     * you then try and embed an actionable control within the list (e.g. a play button
     * for a video, or a favoriting star). Instead, use the List mixin behavior.
     *
     */
     // Modified from //webclient version. Simplified.
    $.fn.pressable = function() {
        var HL_CLASS = 'hl';
        return this
            .on($.touchEvents.start, function(e) {
                var $this = $(this);
                if (!$this.hasClass("disabled")) {
                    $this.addClass(HL_CLASS);
                }
            })
            .on($.touchEvents.cancel, function(e) {
                $(this).removeClass(HL_CLASS);
            });
    };
}(Zepto));