From c94fb32c7a3c28b18a27460aa2447eeec1fac1de Mon Sep 17 00:00:00 2001
From: Pascal Szewczyk <ps@elektrowecker.de>
Date: Mon, 18 Jul 2016 23:23:54 +0200
Subject: uikit added

---
 js/components/grid-parallax.js | 168 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100755 js/components/grid-parallax.js

(limited to 'js/components/grid-parallax.js')

diff --git a/js/components/grid-parallax.js b/js/components/grid-parallax.js
new file mode 100755
index 0000000..45b7a9e
--- /dev/null
+++ b/js/components/grid-parallax.js
@@ -0,0 +1,168 @@
+/*! UIkit 2.26.4 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */
+(function(addon) {
+
+    var component;
+
+    if (window.UIkit) {
+        component = addon(UIkit);
+    }
+
+    if (typeof define == "function" && define.amd) {
+        define("uikit-grid-parallax", ["uikit"], function(){
+            return component || addon(UIkit);
+        });
+    }
+
+})(function(UI){
+
+    var parallaxes  = [], checkParallaxes = function() {
+
+            requestAnimationFrame(function(){
+                for (var i=0; i < parallaxes.length; i++) {
+                    parallaxes[i].process();
+                }
+            });
+        };
+
+
+    UI.component('gridparallax', {
+
+        defaults: {
+            target   : false,
+            smooth   : 150,
+            translate     : 150
+        },
+
+        boot: function() {
+
+            // listen to scroll and resize
+            UI.$doc.on("scrolling.uk.document", checkParallaxes);
+            UI.$win.on("load resize orientationchange", UI.Utils.debounce(function(){
+                checkParallaxes();
+            }, 50));
+
+            // init code
+            UI.ready(function(context) {
+
+                UI.$('[data-uk-grid-parallax]', context).each(function() {
+
+                    var parallax = UI.$(this);
+
+                    if (!parallax.data("gridparallax")) {
+                        UI.gridparallax(parallax, UI.Utils.options(parallax.attr("data-uk-grid-parallax")));
+                    }
+                });
+            });
+        },
+
+        init: function() {
+
+            var $this = this;
+
+            this.initItems().process();
+            parallaxes.push(this);
+
+            UI.$win.on('load resize orientationchange', (function() {
+
+                var fn = function() {
+                    var columns  = getcolumns($this.element);
+
+                    $this.element.css('margin-bottom', '');
+
+                    if (columns > 1) {
+                        $this.element.css('margin-bottom', $this.options.translate + parseInt($this.element.css('margin-bottom')));
+                    }
+                };
+
+                UI.$(function() { fn(); });
+
+                return UI.Utils.debounce(fn, 50);
+            })());
+        },
+
+        initItems: function() {
+
+            var smooth = this.options.smooth;
+
+            this.items = (this.options.target ? this.element.find(this.options.target) : this.element.children()).each(function(){
+                UI.$(this).css({
+                    transition: 'transform '+smooth+'ms linear',
+                    transform: ''
+                });
+            });
+
+            return this;
+        },
+
+        process: function() {
+
+            var percent  = percentageInViewport(this.element),
+                columns  = getcolumns(this.element),
+                items    = this.items,
+                mods     = [(columns-1)];
+
+            if (columns == 1 || !percent) {
+                items.css('transform', '');
+                return;
+            }
+
+            while(mods.length < columns) {
+               if(!(mods[mods.length-1] - 2)) break;
+               mods.push(mods[mods.length-1] - 2);
+            }
+
+            var translate  = this.options.translate, percenttranslate = percent * translate;
+
+            items.each(function(idx, ele, translate){
+                translate = mods.indexOf((idx+1) % columns) != -1 ? percenttranslate : percenttranslate / 8;
+                UI.$(this).css('transform', 'translate3d(0,'+(translate)+'px, 0)');
+            });
+        }
+
+    });
+
+
+    function getcolumns(element) {
+
+        var children = element.children(),
+            first    = children.filter(':visible:first'),
+            top      = first[0].offsetTop + first.outerHeight();
+
+        for (var column=0;column<children.length;column++) {
+            if (children[column].offsetTop >= top)  break;
+        }
+
+        return column || 1;
+    }
+
+    function percentageInViewport(element) {
+
+        var top       = element.offset().top,
+            height    = element.outerHeight(),
+            scrolltop = UIkit.$win.scrollTop(),
+            wh        = window.innerHeight,
+            distance, percentage, percent;
+
+        if (top > (scrolltop + wh)) {
+            percent = 0;
+        } else if ((top + height) < scrolltop) {
+            percent = 1;
+        } else {
+
+            if ((top + height) < wh) {
+                percent = (scrolltop < wh ? scrolltop : scrolltop - wh) / (top+height);
+            } else {
+
+                distance   = (scrolltop + wh) - top;
+                percentage = Math.round(distance / ((wh + height) / 100));
+                percent    = percentage/100;
+            }
+
+            if (top < wh) {
+                percent = percent * scrolltop / ((top + height) - wh);
+            }
+        }
+
+        return percent > 1 ? 1:percent;
+    }
+});
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