src/editor/plugins/core/edumed/order/view.js

   1 define(function(require) {
   2
   3 'use strict';
   4 var $ = require('libs/jquery');
   5
   6 var _ = require('libs/underscore'),
   7     Backbone = require('libs/backbone'),
   8     viewTemplate = require('libs/text!./view.html'),
   9     viewItemTemplate = require('libs/text!./viewItem.html');
  10
  11
  12 var OrderExerciseView = function(element) {
  13     this.element = element;
  14     this.dom = $(_.template(viewTemplate)());
  15     this.modePills = this.dom.find('.modePills');
  16     this.list = this.dom.find('ol');
  17     this.addButton = this.dom.find('button.add');
  18     this.description = this.dom.find('.description');
  19     this.itemViews = [];
  20
  21     this.addButton.on('click', function(e) {
  22         e.stopPropagation();
  23         e.preventDefault();
  24         this.trigger('newItemRequested');
  25         //_.last(this.itemViews).editStart();
  26     }.bind(this));
  27
  28     this.modePills.find('a').on('click', function(e) {
  29         e.stopPropagation();
  30         e.preventDefault();
  31         this.setMode($(e.target).parent().attr('mode'));
  32     }.bind(this));
  33
  34     this.mode = 'initial';
  35
  36     var dropTargets = this.dom.find('.placeholder-top');
  37
  38     dropTargets.on('dragend', function() {
  39         dropTargets.removeClass('dragged');
  40     });
  41
  42     dropTargets.on('dragenter', function() {
  43         var first = this.itemViews[0];
  44         if(this.mode === 'correct') {
  45             first = this.itemViews.slice(0)
  46                 .sort(function(view1, view2) {
  47                     if(view1.item.getAnswer() > view2.item.getAnswer()) {
  48                         return 1;
  49                     }
  50                     return -1;
  51                 })[0];
  52         }
  53         if(!this.allowDropAt(first, true)) {
  54             return;
  55         }
  56         dropTargets.addClass('active');
  57     }.bind(this));
  58
  59     dropTargets.on('dragleave', function() {
  60         dropTargets.removeClass('active');
  61     }.bind(this));
  62
  63     dropTargets.on('dragover', function(e) {
  64         e.preventDefault();
  65         e.originalEvent.dataTransfer.dropEffect = 'move';
  66     });
  67
  68     dropTargets.on('drop', function(e) {
  69         var vid = e.originalEvent.dataTransfer.getData('text');
  70         var droppedItem = $('[vid='+vid+']').data('viewInstance');
  71
  72         var first = this.itemViews[0];
  73         if(this.mode === 'correct') {
  74             first = this.itemViews.slice(0)
  75                 .sort(function(view1, view2) {
  76                     if(view1.item.getAnswer() > view2.item.getAnswer()) {
  77                         return 1;
  78                     }
  79                     return -1;
  80                 })[0];
  81         }
  82
  83         this.trigger(this.mode === 'initial' ? 'moveItem' : 'moveAnswer', droppedItem.item, first.item, 'before');
  84         dropTargets.removeClass('active');
  85     }.bind(this));
  86 };
  87 _.extend(OrderExerciseView.prototype, Backbone.Events, {
  88     addItem: function(item) {
  89         var view = new ItemView(item, this);
  90         view.on('edit', function(text) {
  91             this.trigger('itemEdited', item, text);
  92         }.bind(this));
  93         view.on('receivedDrop', function(droppedItem) {
  94             this.trigger(this.mode === 'initial' ? 'moveItem' : 'moveAnswer', droppedItem.item, item, 'after');
  95         }.bind(this));
  96         view.on('dragStarted', function(view) {
  97             this.draggedView = view;
  98         }.bind(this));
  99         this.list.append(view.dom);
 100         this.itemViews.push(view);
 101
 102         if(this.mode === 'correct') {
 103             this.setMode(this.mode);
 104         }
 105     },
 106     clearItems: function() {
 107         this.list.empty();
 108         this.itemViews.forEach(function(view) {
 109             view.remove();
 110         });
 111         this.itemViews = [];
 112     },
 113     setMode: function(mode) {
 114         this.modePills.find('li').removeClass('active');
 115         this.modePills.find('[mode='+mode+']').addClass('active');
 116         this.mode = mode;
 117         this.list.children().detach();
 118
 119         if(this.mode === 'initial') {
 120             this.itemViews.forEach(function(itemView) {
 121                 this.list.append(itemView.dom);
 122             }.bind(this));
 123         } else {
 124             this.itemViews.slice(0)
 125                 .sort(function(view1, view2) {
 126                     if(view1.item.getAnswer() > view2.item.getAnswer()) {
 127                         return 1;
 128                     }
 129                     return -1;
 130                 })
 131                 .forEach(function(itemView) {
 132                     this.list.append(itemView.dom);
 133                 }.bind(this));
 134         }
 135     },
 136     allowDropAt: function(view, up) {
 137         var arr = [this.draggedView.dom[0]];
 138         if(!up) {
 139             arr.push(this.draggedView.dom.prev()[0]);
 140         }
 141         return !_.contains(arr, view.dom[0]);
 142     }
 143 });
 144
 145 var ItemView = function(item, exerciseView) {
 146     this.item = item;
 147     this.exerciseView = exerciseView;
 148     this.dom = $(_.template(viewItemTemplate)());
 149     this.content = this.dom.find('.content');
 150
 151
 152     var dropTargets = this.dom.find('.placeholder'),
 153         dragSources = this.dom.find('.wrapper');
 154
 155     dragSources.on('dragstart', function(e) {
 156         this.dom.addClass('dragged');
 157         e.originalEvent.dataTransfer.setData('text', this.dom.attr('vid'));
 158         e.originalEvent.effectAllowed = 'move';
 159         this.trigger('dragStarted', this);
 160
 161     }.bind(this));
 162
 163     dropTargets.on('dragend', function() {
 164         this.dom.removeClass('dragged');
 165     });
 166
 167     dropTargets.on('dragenter', function() {
 168         if(!this.exerciseView.allowDropAt(this)) {
 169             return;
 170         }
 171         dropTargets.addClass('active');
 172     }.bind(this));
 173
 174     dropTargets.on('dragleave', function() {
 175         dropTargets.removeClass('active');
 176     }.bind(this));
 177
 178     dropTargets.on('dragover', function(e) {
 179         e.preventDefault();
 180         e.originalEvent.dataTransfer.dropEffect = 'move';
 181     });
 182
 183     dropTargets.on('drop', function(e) {
 184         var vid = e.originalEvent.dataTransfer.getData('text');
 185         var droppedItem = $('[vid='+vid+']').data('viewInstance');
 186         e.preventDefault();
 187         this.trigger('receivedDrop', droppedItem);
 188     }.bind(this));
 189
 190     var content = this.content;
 191     this.container = exerciseView.element.createContainer(item.node.contents(), {
 192         manages: function(node, originaParent) {
 193             return item.node.sameNode(node.parent() || originaParent);
 194         },
 195         dom: content
 196     });
 197
 198     this.dom.data('viewInstance', this);
 199     this.dom.attr('vid', _.uniqueId());
 200 };
 201
 202 _.extend(ItemView.prototype, Backbone.Events, {
 203     remove: function() {
 204         this.container.remove();
 205     }
 206 });
 207
 208 return OrderExerciseView;
 209
 210 });
 211
 212