all files / app/core/directives/ms-timeline/ ms-timeline.js

17.57% Statements 13/74
0% Branches 0/14
3.57% Functions 1/28
17.57% Lines 13/74
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
(function ()
{
    'use strict';
 
    angular
        .module('app.core')
        .controller('MsTimelineController', MsTimelineController)
        .directive('msTimeline', msTimelineDirective)
        .directive('msTimelineItem', msTimelineItemDirective);
 
    /** @ngInject */
    function MsTimelineController()
    {
        var vm = this;
 
        // Data
        vm.scrollEl = undefined;
 
        // Methods
        vm.setScrollEl = setScrollEl;
        vm.getScrollEl = getScrollEl;
 
        //////////
 
        /**
         * Set scroll element
         *
         * @param scrollEl
         */
        function setScrollEl(scrollEl)
        {
            vm.scrollEl = scrollEl;
        }
 
        /**
         * Get scroll element
         *
         * @returns {undefined|*}
         */
        function getScrollEl()
        {
            return vm.scrollEl;
        }
    }
 
    /** @ngInject */
    function msTimelineDirective()
    {
        return {
            scope     : {
                msTimeline: '=?',
                loadMore  : '&?msTimelineLoadMore'
            },
            controller: 'MsTimelineController',
            compile   : function (tElement)
            {
                tElement.addClass('ms-timeline');
 
                return function postLink(scope, iElement, iAttrs, MsTimelineCtrl)
                {
                    // Create an element for triggering the load more action and append it
                    var loadMoreEl = angular.element('<div class="ms-timeline-loader md-accent-bg md-whiteframe-4dp"><span class="spinner animate-rotate"></span></div>');
                    iElement.append(loadMoreEl);
 
                    // Default config
                    var config = {
                        scrollEl: '#content'
                    };
 
                    // Extend the configuration
                    config = angular.extend(config, scope.msTimeline, {});
                    
                    // Grab the scrollable element and store it in the controller for general use
                    var scrollEl = angular.element(config.scrollEl);
                    MsTimelineCtrl.setScrollEl(scrollEl);
 
                    // Threshold
                    var threshold = 144;
 
                    // Register onScroll event for the first time
                    registerOnScroll();
 
                    /**
                     * onScroll Event
                     */
                    function onScroll()
                    {
                        if ( scrollEl.scrollTop() + scrollEl.height() + threshold > loadMoreEl.position().top )
                        {
                            // Show the loader
                            loadMoreEl.addClass('show');
 
                            // Unregister scroll event to prevent triggering the function over and over again
                            unregisterOnScroll();
 
                            // Trigger load more event
                            scope.loadMore().then(
                                // Success
                                function ()
                                {
                                    // Hide the loader
                                    loadMoreEl.removeClass('show');
 
                                    // Register the onScroll event again
                                    registerOnScroll();
                                },
 
                                // Error
                                function ()
                                {
                                    // Remove the loader completely
                                    loadMoreEl.remove();
                                }
                            );
                        }
                    }
 
                    /**
                     * onScroll event registerer
                     */
                    function registerOnScroll()
                    {
                        scrollEl.on('scroll', onScroll);
                    }
 
                    /**
                     * onScroll event unregisterer
                     */
                    function unregisterOnScroll()
                    {
                        scrollEl.off('scroll', onScroll);
                    }
 
                    // Cleanup
                    scope.$on('$destroy', function ()
                    {
                        unregisterOnScroll();
                    });
                };
            }
        };
    }
 
    /** @ngInject */
    function msTimelineItemDirective($timeout, $q)
    {
        return {
            scope  : true,
            require: '^msTimeline',
            compile: function (tElement)
            {
                tElement.addClass('ms-timeline-item').addClass('hidden');
 
                return function postLink(scope, iElement, iAttrs, MsTimelineCtrl)
                {
                    var threshold = 72,
                        itemLoaded = false,
                        itemInViewport = false,
                        scrollEl = MsTimelineCtrl.getScrollEl();
 
                    //////////
 
                    init();
 
                    /**
                     * Initialize
                     */
                    function init()
                    {
                        // Check if the timeline item has ms-card
                        if ( iElement.find('ms-card') )
                        {
                            // If the ms-card template loaded...
                            scope.$on('msCard::cardTemplateLoaded', function (event, args)
                            {
                                var cardEl = angular.element(args[0]);
 
                                // Test the card to see if there is any image on it
                                testForImage(cardEl).then(function ()
                                {
                                    $timeout(function ()
                                    {
                                        itemLoaded = true;
                                    });
                                });
                            });
                        }
                        else
                        {
                            // Test the element to see if there is any image on it
                            testForImage(iElement).then(function ()
                            {
                                $timeout(function ()
                                {
                                    itemLoaded = true;
                                });
                            });
                        }
 
                        // Check if the loaded element also in the viewport
                        scrollEl.on('scroll', testForVisibility);
 
                        // Test for visibility for the first time without waiting for the scroll event
                        testForVisibility();
                    }
 
                    // Item ready watcher
                    var itemReadyWatcher = scope.$watch(
                        function ()
                        {
                            return itemLoaded && itemInViewport;
                        },
                        function (current, old)
                        {
                            if ( angular.equals(current, old) )
                            {
                                return;
                            }
 
                            if ( current )
                            {
                                iElement.removeClass('hidden').addClass('animate');
 
                                // Unbind itemReadyWatcher
                                itemReadyWatcher();
                            }
                        }, true);
 
                    /**
                     * Test the given element for image
                     *
                     * @param element
                     * @returns promise
                     */
                    function testForImage(element)
                    {
                        var deferred = $q.defer(),
                            imgEl = element.find('img');
 
                        if ( imgEl.length > 0 )
                        {
                            imgEl.on('load', function ()
                            {
                                deferred.resolve('Image is loaded');
                            });
                        }
                        else
                        {
                            deferred.resolve('No images');
                        }
 
                        return deferred.promise;
                    }
 
                    /**
                     * Test the element for visibility
                     */
                    function testForVisibility()
                    {
                        if ( scrollEl.scrollTop() + scrollEl.height() > iElement.position().top + threshold )
                        {
                            $timeout(function ()
                            {
                                itemInViewport = true;
                            });
 
                            // Unbind the scroll event
                            scrollEl.off('scroll', testForVisibility);
                        }
                    }
                };
            }
        };
    }
})();