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editor: Missing names of exercises on a canvas
[fnpeditor.git] / src / editor / modules / documentCanvas / canvas / canvas.js
diff --git a/src/editor/modules/documentCanvas/canvas/canvas.js b/src/editor/modules/documentCanvas/canvas/canvas.js
index bcfc954..ebede40 100644 (file)
--- a/src/editor/modules/documentCanvas/canvas/canvas.js
+++ b/src/editor/modules/documentCanvas/canvas/canvas.js
@@ -3,14 +3,20 @@ define([
 'libs/underscore',
 'libs/backbone',
 'fnpjs/logging/logging',
 'libs/underscore',
 'libs/backbone',
 'fnpjs/logging/logging',
+'views/menu/menu',
 'modules/documentCanvas/canvas/documentElement',
 'modules/documentCanvas/canvas/keyboard',
 'modules/documentCanvas/canvas/utils',
 'modules/documentCanvas/canvas/wlxmlListener',
 'modules/documentCanvas/canvas/elementsRegister',
 'modules/documentCanvas/canvas/genericElement',
 'modules/documentCanvas/canvas/documentElement',
 'modules/documentCanvas/canvas/keyboard',
 'modules/documentCanvas/canvas/utils',
 'modules/documentCanvas/canvas/wlxmlListener',
 'modules/documentCanvas/canvas/elementsRegister',
 'modules/documentCanvas/canvas/genericElement',
-], function($, _, Backbone, logging, documentElement, keyboard, utils, wlxmlListener, ElementsRegister, genericElement) {
-    
+'modules/documentCanvas/canvas/nullElement',
+'modules/documentCanvas/canvas/gutter',
+'modules/documentCanvas/canvas/selection',
+'modules/documentCanvas/canvas/keyEvent',
+'libs/text!./canvas.html'
+], function($, _, Backbone, logging, Menu, documentElement, keyboard, utils, wlxmlListener, ElementsRegister, genericElement, nullElement, gutter, selection, keyEvent, canvasTemplate) {
+
 'use strict';
 /* global document:false, window:false, Node:false, gettext */
 
 'use strict';
 /* global document:false, window:false, Node:false, gettext */
 
@@ -57,8 +63,10 @@ $.extend(TextHandler.prototype, {
 });
 
 
 });
 
 
-var Canvas = function(wlxmlDocument, elements) {
-    this.elementsRegister = new ElementsRegister(documentElement.DocumentNodeElement, genericElement);
+var Canvas = function(wlxmlDocument, elements, metadata, sandbox) {
+    this.metadata = metadata || {};
+    this.sandbox = sandbox;
+    this.elementsRegister = this.createElementsRegister();
 
     elements = [
         {tag: 'section', klass: null, prototype: genericElement},
 
     elements = [
         {tag: 'section', klass: null, prototype: genericElement},
@@ -72,7 +80,15 @@ var Canvas = function(wlxmlDocument, elements) {
         this.elementsRegister.register(elementDesc);
     }.bind(this));
     this.eventBus = _.extend({}, Backbone.Events);
         this.elementsRegister.register(elementDesc);
     }.bind(this));
     this.eventBus = _.extend({}, Backbone.Events);
-    this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
+    
+    this.dom = $(canvasTemplate);
+    this.rootWrapper = this.dom.find('.root-wrapper');
+    
+
+    this.gutter = gutter.create();
+    this.gutterView = new gutter.GutterView(this.gutter);
+    this.dom.find('.view-row').append(this.gutterView.dom);
+    
     this.wlxmlListener = wlxmlListener.create(this);
     this.loadWlxmlDocument(wlxmlDocument);
     this.setupEventHandling();
     this.wlxmlListener = wlxmlListener.create(this);
     this.loadWlxmlDocument(wlxmlDocument);
     this.setupEventHandling();
@@ -81,6 +97,19 @@ var Canvas = function(wlxmlDocument, elements) {
 
 $.extend(Canvas.prototype, Backbone.Events, {
 
 
 $.extend(Canvas.prototype, Backbone.Events, {
 
+    createElementType: function(elementPrototype) {
+        /* TODO: reconcile this with ElementsRegister behavior */
+        var Constructor = function() {
+            documentElement.DocumentNodeElement.apply(this, Array.prototype.slice.call(arguments, 0));
+        };
+        Constructor.prototype = elementPrototype;
+        return Constructor;
+    },
+
+    getElementOffset: function(element) {
+        return element.dom.offset().top - this.dom.offset().top;
+    },
+
     loadWlxmlDocument: function(wlxmlDocument) {
         if(!wlxmlDocument) {
             return false;
     loadWlxmlDocument: function(wlxmlDocument) {
         if(!wlxmlDocument) {
             return false;
@@ -91,14 +120,28 @@ $.extend(Canvas.prototype, Backbone.Events, {
         this.reloadRoot();
     },
 
         this.reloadRoot();
     },
 
-    createElement: function(wlxmlNode) {
+    createElement: function(wlxmlNode, register, useRoot) {
         var Factory;
         var Factory;
+        register = register || this.elementsRegister;
         if(wlxmlNode.nodeType === Node.TEXT_NODE) {
             Factory = documentElement.DocumentTextElement;
         } else {
         if(wlxmlNode.nodeType === Node.TEXT_NODE) {
             Factory = documentElement.DocumentTextElement;
         } else {
+            Factory = register.getElement({tag: wlxmlNode.getTagName(), klass: wlxmlNode.getClass()});
+        }
+        if(!Factory && useRoot) {
             Factory = this.elementsRegister.getElement({tag: wlxmlNode.getTagName(), klass: wlxmlNode.getClass()});
             Factory = this.elementsRegister.getElement({tag: wlxmlNode.getTagName(), klass: wlxmlNode.getClass()});
+            if(!Factory) {
+                Factory = documentElement.DocumentNodeElement;
+            }
+        }
+
+        if(Factory) {
+            return new Factory(wlxmlNode, this);
         }
         }
-        return new Factory(wlxmlNode, this);
+    },
+
+    createElementsRegister: function() {
+        return new ElementsRegister(documentElement.DocumentNodeElement, nullElement);
     },
 
     getDocumentElement: function(htmlElement) {
     },
 
     getDocumentElement: function(htmlElement) {
@@ -122,40 +165,77 @@ $.extend(Canvas.prototype, Backbone.Events, {
     },
 
     reloadRoot: function() {
     },
 
     reloadRoot: function() {
+        if(this.rootElement) {
+            this.rootElement.detach();
+        }
         this.rootElement = this.createElement(this.wlxmlDocument.root);
         this.rootElement = this.createElement(this.wlxmlDocument.root);
-        this.wrapper.empty();
-        this.wrapper.append(this.rootElement.dom);
+        this.rootWrapper.append(this.rootElement.dom);
+    },
+
+    triggerKeyEvent: function(keyEvent, selection) {
+        selection = selection || this.getSelection();
+        if(selection && (selection.type === 'caret' || selection.type === 'textSelection') && selection.toDocumentFragment().isValid()) {
+            keyboard.handleKeyEvent(keyEvent, selection);
+        }
+    },
+
+    createAction: function(fqName, config) {
+        return this.sandbox.createAction(fqName, config);
     },
 
     setupEventHandling: function() {
         var canvas = this;
 
     },
 
     setupEventHandling: function() {
         var canvas = this;
 
-        this.wrapper.on('keyup keydown keypress', function(e) {
-            keyboard.handleKey(e, canvas);
+        /* globals document */
+        $(document.body).on('keydown', function(e) {
+            canvas.triggerKeyEvent(keyEvent.fromNativeEvent(e));
         });
 
         });
 
-        this.wrapper.on('mouseup', function() {
+        this.rootWrapper.on('mouseup', function() {
             canvas.triggerSelectionChanged();
         });
 
         var mouseDown;
             canvas.triggerSelectionChanged();
         });
 
         var mouseDown;
-        this.wrapper.on('mousedown', '[document-node-element], [document-text-element]', function(e) {
+        this.rootWrapper.on('mousedown', '[document-node-element], [document-text-element]', function(e) {
             mouseDown = e.target;
             mouseDown = e.target;
+            canvas.rootWrapper.find('[contenteditable]').attr('contenteditable', null);
         });
 
         });
 
-        this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
+        this.rootWrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
+            var position, element;
             e.stopPropagation();
             if(e.originalEvent.detail === 3) {
                 e.preventDefault();
                 canvas._moveCaretToTextElement(canvas.getDocumentElement(e.currentTarget), 'whole');
             } else {
                 if(mouseDown === e.target) {
             e.stopPropagation();
             if(e.originalEvent.detail === 3) {
                 e.preventDefault();
                 canvas._moveCaretToTextElement(canvas.getDocumentElement(e.currentTarget), 'whole');
             } else {
                 if(mouseDown === e.target) {
-                    canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
+                    element = canvas.getDocumentElement(e.target);
+                    if(element && element.wlxmlNode.nodeType === Node.ELEMENT_NODE) {
+                        if(element.getVerticallyFirstTextElement && !element.getVerticallyFirstTextElement({considerChildren: false})) {
+                            canvas.setCurrentElement(element);
+                            return;
+                        }
+                    }
+                    if(window.getSelection().isCollapsed) {
+                        position = utils.caretPositionFromPoint(e.clientX, e.clientY);
+                        canvas.setCurrentElement(canvas.getDocumentElement(position.textNode), {caretTo: position.offset});
+                    }
                 }
             }
         });
 
                 }
             }
         });
 
-        this.wrapper.on('paste', function(e) {
+        this.rootWrapper.on('contextmenu', function(e) {
+            var el = canvas.getDocumentElement(e.target);
+            
+            if(!el) {
+                return;
+            }
+
+            e.preventDefault();
+            this.showContextMenu(el, {x: e.clientX, y: e.clientY});
+        }.bind(this));
+
+        this.rootWrapper.on('paste', function(e) {
             e.preventDefault();
 
             var clipboardData = e.originalEvent.clipboardData;
             e.preventDefault();
 
             var clipboardData = e.originalEvent.clipboardData;
@@ -182,7 +262,7 @@ $.extend(Canvas.prototype, Backbone.Events, {
         /* globals MutationObserver */
         var observer = new MutationObserver(function(mutations) {
             mutations.forEach(function(mutation) {
         /* globals MutationObserver */
         var observer = new MutationObserver(function(mutations) {
             mutations.forEach(function(mutation) {
-                if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
+                if(canvas.dom[0].contains(mutation.target) && documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
                     observer.disconnect();
                     if(mutation.target.data === '') {
                         mutation.target.data = utils.unicode.ZWS;
                     observer.disconnect();
                     if(mutation.target.data === '') {
                         mutation.target.data = utils.unicode.ZWS;
@@ -191,7 +271,7 @@ $.extend(Canvas.prototype, Backbone.Events, {
                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
                     }
                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
                     }
-                    observer.observe(canvas.wrapper[0], config);
+                    observer.observe(canvas.dom[0], config);
 
                     var textElement = canvas.getDocumentElement(mutation.target),
                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 
                     var textElement = canvas.getDocumentElement(mutation.target),
                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
@@ -205,11 +285,15 @@ $.extend(Canvas.prototype, Backbone.Events, {
             });
         });
         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
             });
         });
         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
-        observer.observe(this.wrapper[0], config);
+        observer.observe(this.rootWrapper[0], config);
 
 
 
 
-        this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
-            var el = canvas.getDocumentElement(e.currentTarget);
+        var hoverHandler = function(e) {
+            var el = canvas.getDocumentElement(e.currentTarget),
+                expose = {
+                    mouseover: true,
+                    mouseout: false
+                };
             if(!el) {
                 return;
             }
             if(!el) {
                 return;
             }
@@ -217,19 +301,11 @@ $.extend(Canvas.prototype, Backbone.Events, {
             if(el instanceof documentElement.DocumentTextElement) {
                 el = el.parent();
             }
             if(el instanceof documentElement.DocumentTextElement) {
                 el = el.parent();
             }
-            el.toggleLabel(true);
-        });
-        this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
-            var el = canvas.getDocumentElement(e.currentTarget);
-            if(!el) {
-                return;
-            }
-            e.stopPropagation();
-            if(el instanceof documentElement.DocumentTextElement) {
-                el = el.parent();
-            }
-            el.toggleLabel(false);
-        });
+            el.updateState({exposed:expose[e.type]});
+        };
+
+        this.rootWrapper.on('mouseover', '[document-node-element], [document-text-element]', hoverHandler);
+        this.rootWrapper.on('mouseout', '[document-node-element], [document-text-element]', hoverHandler);
 
         this.eventBus.on('elementToggled', function(toggle, element) {
             if(!toggle) {
 
         this.eventBus.on('elementToggled', function(toggle, element) {
             if(!toggle) {
@@ -239,7 +315,7 @@ $.extend(Canvas.prototype, Backbone.Events, {
     },
 
     view: function() {
     },
 
     view: function() {
-        return this.wrapper;
+        return this.dom;
     },
 
     doc: function() {
     },
 
     doc: function() {
@@ -247,8 +323,8 @@ $.extend(Canvas.prototype, Backbone.Events, {
     },
 
     toggleElementHighlight: function(node, toggle) {
     },
 
     toggleElementHighlight: function(node, toggle) {
-        var element = utils.findCanvasElement(node);
-        element.toggleHighlight(toggle);
+        var element = utils.getElementForNode(node);
+        element.updateState({exposed: toggle});
     },
 
     getCursor: function() {
     },
 
     getCursor: function() {
@@ -257,14 +333,11 @@ $.extend(Canvas.prototype, Backbone.Events, {
 
     
     getCurrentNodeElement: function() {
 
     
     getCurrentNodeElement: function() {
-        var htmlElement = this.wrapper.find('.current-node-element').parent()[0];
-        if(htmlElement) {
-            return this.getDocumentElement(htmlElement);
-        }
+        return this.currentNodeElement;
     },
 
     getCurrentTextElement: function() {
     },
 
     getCurrentTextElement: function() {
-        var htmlElement = this.wrapper.find('.current-text-element')[0];
+        var htmlElement = this.rootWrapper.find('.current-text-element')[0];
         if(htmlElement) {
             return this.getDocumentElement(htmlElement);
         }
         if(htmlElement) {
             return this.getDocumentElement(htmlElement);
         }
@@ -285,17 +358,50 @@ $.extend(Canvas.prototype, Backbone.Events, {
     },
 
     contains: function(element) {
     },
 
     contains: function(element) {
-        return element.dom.parents().index(this.wrapper) !== -1;
+        return element && element.dom && element.dom.parents().index(this.rootWrapper) !== -1;
     },
 
     triggerSelectionChanged: function() {
     },
 
     triggerSelectionChanged: function() {
-        this.trigger('selectionChanged', this.getSelection());
+        var s = this.getSelection(),
+            f;
+        if(!s) {
+            return;
+        }
+        this.trigger('selectionChanged', s);
+        f = s.toDocumentFragment();
+
+        if(f && f instanceof f.RangeFragment) {
+            if(this.currentNodeElement) {
+                this.currentNodeElement.updateState({active: false});
+                this.currentNodeElement = null;
+            }
+        }
     },
 
     getSelection: function() {
     },
 
     getSelection: function() {
-        return new Selection(this);
+        return selection.fromNativeSelection(this);
+    },
+
+    select: function(fragment) {
+        if(fragment instanceof this.wlxmlDocument.RangeFragment) {
+            this.setCurrentElement(fragment.endNode, {caretTo: fragment.endOffset});
+        } else if(fragment instanceof this.wlxmlDocument.NodeFragment) {
+            var params = {
+                caretTo: fragment instanceof this.wlxmlDocument.CaretFragment ? fragment.offset : 'start'
+            };
+            this.setCurrentElement(fragment.node, params);
+        } else {
+            logger.debug('Fragment not supported');
+        }
+    },
+
+    setSelection: function(selection) {
+        this.select(this, selection.toDocumentFragment());
     },
 
     },
 
+    createSelection: function(params) {
+        return selection.fromParams(this, params);
+    },
     setCurrentElement: function(element, params) {
         if(!element) {
             logger.debug('Invalid element passed to setCurrentElement: ' + element);
     setCurrentElement: function(element, params) {
         if(!element) {
             logger.debug('Invalid element passed to setCurrentElement: ' + element);
@@ -303,7 +409,7 @@ $.extend(Canvas.prototype, Backbone.Events, {
         }
 
         if(!(element instanceof documentElement.DocumentElement)) {
         }
 
         if(!(element instanceof documentElement.DocumentElement)) {
-            element = utils.findCanvasElement(element);
+            element = utils.getElementForNode(element);
         }
 
         if(!element || !this.contains(element)) {
         }
 
         if(!element || !this.contains(element)) {
@@ -317,21 +423,18 @@ $.extend(Canvas.prototype, Backbone.Events, {
             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
                 return byBrowser;
             }
             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
                 return byBrowser;
             }
-            var children = e.children();
-            for(var i = 0; i < children.length; i++) {
-                if(children[i] instanceof documentElement.DocumentTextElement) {
-                    return children[i];
-                }
-            }
-            return null;
+            return _.isFunction(e.getVerticallyFirstTextElement) ? e.getVerticallyFirstTextElement({considerChildren: false}) : null;
         }.bind(this);
         var _markAsCurrent = function(element) {
             if(element instanceof documentElement.DocumentTextElement) {
         }.bind(this);
         var _markAsCurrent = function(element) {
             if(element instanceof documentElement.DocumentTextElement) {
-                this.wrapper.find('.current-text-element').removeClass('current-text-element');
+                this.rootWrapper.find('.current-text-element').removeClass('current-text-element');
                 element.dom.addClass('current-text-element');
             } else {
                 element.dom.addClass('current-text-element');
             } else {
-                this.wrapper.find('.current-node-element').removeClass('current-node-element');
-                element._container().addClass('current-node-element');
+                if(this.currentNodeElement) {
+                    this.currentNodeElement.updateState({active: false});
+                }
+                element.updateState({active: true});
+                this.currentNodeElement = element;
             }
         }.bind(this);
 
             }
         }.bind(this);
 
@@ -343,12 +446,12 @@ $.extend(Canvas.prototype, Backbone.Events, {
             currentNodeElement = this.getCurrentNodeElement();
 
         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
             currentNodeElement = this.getCurrentNodeElement();
 
         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
-            this.wrapper.find('.current-text-element').removeClass('current-text-element');
+            this.rootWrapper.find('.current-text-element').removeClass('current-text-element');
         }
 
         if(textElementToLand) {
             _markAsCurrent(textElementToLand);
         }
 
         if(textElementToLand) {
             _markAsCurrent(textElementToLand);
-            if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
+            if((params.caretTo || params.caretTo === 0) || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
             }
         } else {
                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
             }
         } else {
@@ -380,9 +483,10 @@ $.extend(Canvas.prototype, Backbone.Events, {
         }
         var selection = document.getSelection();
 
         }
         var selection = document.getSelection();
 
+        $(node).parent().attr('contenteditable', true);
         selection.removeAllRanges();
         selection.addRange(range);
         selection.removeAllRanges();
         selection.addRange(range);
-        this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
+        $(node).parent().focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
     },
 
     setCursorPosition: function(position) {
     },
 
     setCursorPosition: function(position) {
@@ -390,81 +494,21 @@ $.extend(Canvas.prototype, Backbone.Events, {
             this._moveCaretToTextElement(position.element, position.offset);
         }
     },
             this._moveCaretToTextElement(position.element, position.offset);
         }
     },
+    showContextMenu: function(element, coors) {
+        var menu = new Menu();
 
 
-    findCanvasElement: function(node) {
-        return utils.findCanvasElement(node);
-    },
-
-    toggleGrid: function() {
-        this.wrapper.toggleClass('grid-on');
-        this.trigger('changed');
-    },
-    isGridToggled: function() {
-        return this.wrapper.hasClass('grid-on');
-    }
-});
-
-
-var isText = function(node) {
-    return node && node.nodeType === Node.TEXT_NODE && $(node.parentNode).is('[document-text-element]');
-};
-
-var Selection = function(canvas) {
-    this.canvas = canvas;
-    var nativeSelection = this.nativeSelection = window.getSelection();
-    Object.defineProperty(this, 'type', {
-        get: function() {
-            if(nativeSelection.focusNode) {
-                if(nativeSelection.isCollapsed && isText(nativeSelection.focusNode)) {
-                    return 'caret';
-                }
-                if(isText(nativeSelection.focusNode) && isText(nativeSelection.anchorNode)) {
-                    return 'textSelection';
-                }
-            }
-            if(canvas.getCurrentNodeElement()) {
-                return 'node';
-            }
-        }
-    });
-};
-
-$.extend(Selection.prototype, {
-    toDocumentFragment: function() {
-        var doc = this.canvas.wlxmlDocument,
-            anchorElement = this.canvas.getDocumentElement(this.nativeSelection.anchorNode),
-            focusElement = this.canvas.getDocumentElement(this.nativeSelection.focusNode),
-            anchorNode = anchorElement ? anchorElement.wlxmlNode : null,
-            focusNode = focusElement ? focusElement.wlxmlNode : null;
-        if(this.type === 'caret') {
-            return doc.createFragment(doc.CaretFragment, {node: anchorNode, offset: this.nativeSelection.anchorOffset});
-        }
-        if(this.type === 'textSelection') {
-            if(anchorNode.isSiblingOf(focusNode)) {
-                return doc.createFragment(doc.TextRangeFragment, {
-                    node1: anchorNode,
-                    offset1: this.nativeSelection.anchorOffset,
-                    node2: focusNode,
-                    offset2: this.nativeSelection.focusOffset,
-                });
-            }
-            else {
-                var siblingParents = doc.getSiblingParents({node1: anchorNode, node2: focusNode});
-                return doc.createFragment(doc.RangeFragment, {
-                    node1: siblingParents.node1,
-                    node2: siblingParents.node2
-                });
-            }
+        while(element) {
+            (element.contextMenuActions || []).forEach(menu.addAction.bind(menu));
+            element = element.parent();
         }
         }
-        if(this.type === 'node') {
-            return doc.createFragment(doc.NodeFragment, {node: this.canvas.getCurrentNodeElement().wlxmlNode});
+        if(menu.actions.length) {
+            menu.updateContextParam('fragment', this.getSelection().toDocumentFragment());
+            this.sandbox.showContextMenu(menu, {x: coors.x, y: coors.y});
         }
         }
-    },
-    sameAs: function(other) {
-        void(other);
     }
 });
 
     }
 });
 
+
 var Cursor = function(canvas) {
     this.canvas = canvas;
     this.selection = window.getSelection();
 var Cursor = function(canvas) {
     this.canvas = canvas;
     this.selection = window.getSelection();
@@ -572,7 +616,7 @@ $.extend(Cursor.prototype, {
             if(selection.anchorNode === selection.focusNode) {
                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
             } else {
             if(selection.anchorNode === selection.focusNode) {
                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
             } else {
-                anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
+                anchorFirst = (parent.getFirst(anchorElement, focusElement) === anchorElement);
             }
             placeData = getPlaceData(anchorFirst);
         } else {
             }
             placeData = getPlaceData(anchorFirst);
         } else {
@@ -592,8 +636,8 @@ $.extend(Cursor.prototype, {
 });
 
 return {
 });
 
 return {
-    fromXMLDocument: function(wlxmlDocument, elements) {
-        return new Canvas(wlxmlDocument, elements);
+    fromXMLDocument: function(wlxmlDocument, elements, metadata, sandbox) {
+        return new Canvas(wlxmlDocument, elements, metadata, sandbox);
     }
 };
 
     }
 };