Questions-and-Answers/media/uikit-v2/js/core/switcher.js

/*! UIkit 2.27.5 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */
(function(UI) {

    "use strict";

    var Animations;

    UI.component('switcher', {

        defaults: {
            connect   : false,
            toggle    : '>*',
            active    : 0,
            animation : false,
            duration  : 200,
            swiping   : true
        },

        animating: false,

        boot: function() {

            // init code
            UI.ready(function(context) {

                UI.$('[data-uk-switcher]', context).each(function() {
                    var switcher = UI.$(this);

                    if (!switcher.data('switcher')) {
                        var obj = UI.switcher(switcher, UI.Utils.options(switcher.attr('data-uk-switcher')));
                    }
                });
            });
        },

        init: function() {

            var $this = this;

            this.on('click.uk.switcher', this.options.toggle, function(e) {
                e.preventDefault();
                $this.show(this);
            });

            if (!this.options.connect) {
                return;
            }

            this.connect = UI.$(this.options.connect);

            if (!this.connect.length) {
                return;
            }

            this.connect.on('click.uk.switcher', '[data-uk-switcher-item]', function(e) {

                e.preventDefault();

                var item = UI.$(this).attr('data-uk-switcher-item');

                if ($this.index == item) return;

                switch(item) {
                    case 'next':
                    case 'previous':
                        $this.show($this.index + (item=='next' ? 1:-1));
                        break;
                    default:
                        $this.show(parseInt(item, 10));
                }
            });

            if (this.options.swiping) {

                this.connect.on('swipeRight swipeLeft', function(e) {
                    e.preventDefault();
                    if (!window.getSelection().toString()) {
                        $this.show($this.index + (e.type == 'swipeLeft' ? 1 : -1));
                    }
                });
            }

            this.update();
        },

        update: function() {

            this.connect.children().removeClass('uk-active').attr('aria-hidden', 'true');

            var toggles = this.find(this.options.toggle),
                active  = toggles.filter('.uk-active');

            if (active.length) {
                this.show(active, false);
            } else {

                if (this.options.active===false) return;

                active = toggles.eq(this.options.active);
                this.show(active.length ? active : toggles.eq(0), false);
            }

            // Init ARIA for toggles
            toggles.not(active).attr('aria-expanded', 'false');
            active.attr('aria-expanded', 'true');
        },

        show: function(tab, animate) {

            if (this.animating) {
                return;
            }

            var toggles = this.find(this.options.toggle);

            if (isNaN(tab)) {
                tab = UI.$(tab);
            } else {
                tab = tab < 0 ? toggles.length-1 : tab;
                tab = toggles.eq(toggles[tab] ? tab : 0);
            }

            var $this     = this,
                active    = UI.$(tab),
                animation = Animations[this.options.animation] || function(current, next) {

                    if (!$this.options.animation) {
                        return Animations.none.apply($this);
                    }

                    var anim = $this.options.animation.split(',');

                    if (anim.length == 1) {
                        anim[1] = anim[0];
                    }

                    anim[0] = anim[0].trim();
                    anim[1] = anim[1].trim();

                    return coreAnimation.apply($this, [anim, current, next]);
                };

            if (animate===false || !UI.support.animation) {
                animation = Animations.none;
            }

            if (active.hasClass("uk-disabled")) return;

            // Update ARIA for Toggles
            toggles.attr('aria-expanded', 'false');
            active.attr('aria-expanded', 'true');

            toggles.filter(".uk-active").removeClass("uk-active");
            active.addClass("uk-active");

            if (this.options.connect && this.connect.length) {

                this.index = this.find(this.options.toggle).index(active);

                if (this.index == -1 ) {
                    this.index = 0;
                }

                this.connect.each(function() {

                    var container = UI.$(this),
                        children  = UI.$(container.children()),
                        current   = UI.$(children.filter('.uk-active')),
                        next      = UI.$(children.eq($this.index));

                        $this.animating = true;

                        animation.apply($this, [current, next]).then(function(){

                            current.removeClass("uk-active");
                            next.addClass("uk-active");

                            // Update ARIA for connect
                            current.attr('aria-hidden', 'true');
                            next.attr('aria-hidden', 'false');

                            UI.Utils.checkDisplay(next, true);

                            $this.animating = false;

                        });
                });
            }

            this.trigger("show.uk.switcher", [active]);
        }
    });

    Animations = {

        'none': function() {
            var d = UI.$.Deferred();
            d.resolve();
            return d.promise();
        },

        'fade': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-fade', current, next]);
        },

        'slide-bottom': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-slide-bottom', current, next]);
        },

        'slide-top': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-slide-top', current, next]);
        },

        'slide-vertical': function(current, next, dir) {

            var anim = ['uk-animation-slide-top', 'uk-animation-slide-bottom'];

            if (current && current.index() > next.index()) {
                anim.reverse();
            }

            return coreAnimation.apply(this, [anim, current, next]);
        },

        'slide-left': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-slide-left', current, next]);
        },

        'slide-right': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-slide-right', current, next]);
        },

        'slide-horizontal': function(current, next, dir) {

            var anim = ['uk-animation-slide-right', 'uk-animation-slide-left'];

            if (current && current.index() > next.index()) {
                anim.reverse();
            }

            return coreAnimation.apply(this, [anim, current, next]);
        },

        'scale': function(current, next) {
            return coreAnimation.apply(this, ['uk-animation-scale-up', current, next]);
        }
    };

    UI.switcher.animations = Animations;


    // helpers

    function coreAnimation(cls, current, next) {

        var d = UI.$.Deferred(), clsIn = cls, clsOut = cls, release;

        if (next[0]===current[0]) {
            d.resolve();
            return d.promise();
        }

        if (typeof(cls) == 'object') {
            clsIn  = cls[0];
            clsOut = cls[1] || cls[0];
        }

        UI.$body.css('overflow-x', 'hidden'); // fix scroll jumping in iOS

        release = function() {

            if (current) current.hide().removeClass('uk-active '+clsOut+' uk-animation-reverse');

            next.addClass(clsIn).one(UI.support.animation.end, function() {

                setTimeout(function () {
                    next.removeClass(''+clsIn+'').css({opacity:'', display:''});
                }, 0);

                d.resolve();

                UI.$body.css('overflow-x', '');

                if (current) current.css({opacity:'', display:''});

            }.bind(this)).show();
        };

        next.css('animation-duration', this.options.duration+'ms');

        if (current && current.length) {

            current.css('animation-duration', this.options.duration+'ms');

            current.css('display', 'none').addClass(clsOut+' uk-animation-reverse').one(UI.support.animation.end, function() {
                release();
            }.bind(this)).css('display', '');

        } else {
            next.addClass('uk-active');
            release();
        }

        return d.promise();
    }

})(UIkit2);