X-Git-Url: https://git.mdrn.pl/fnpeditor.git/blobdiff_plain/bf404a740c73d3aa8df7a44ef47012f33933e624..f046659fbe4fd9fb752854f8ccb547918eddc5df:/src/editor/modules/documentCanvas/canvas/documentElement.js

diff --git a/src/editor/modules/documentCanvas/canvas/documentElement.js b/src/editor/modules/documentCanvas/canvas/documentElement.js
index d624112..d40ca9b 100644
--- a/src/editor/modules/documentCanvas/canvas/documentElement.js
+++ b/src/editor/modules/documentCanvas/canvas/documentElement.js
@@ -1,68 +1,66 @@
 define([
 'libs/jquery',
 'libs/underscore',
-'modules/documentCanvas/classAttributes',
-'modules/documentCanvas/canvas/utils',
-'modules/documentCanvas/canvas/widgets',
-'modules/documentCanvas/canvas/wlxmlManagers'
-], function($, _, classAttributes, utils, widgets, wlxmlManagers) {
+'modules/documentCanvas/canvas/utils'
+], function($, _, utils) {
     
 'use strict';
-
+/* global Node:false */
 
 // DocumentElement represents a text or an element node from WLXML document rendered inside Canvas
-var DocumentElement = function(htmlElement, canvas) {
-    if(arguments.length === 0)
-        return;
+var DocumentElement = function(wlxmlNode, canvas) {
+    this.wlxmlNode = wlxmlNode;
     this.canvas = canvas;
-    this._setupDOMHandler(htmlElement);
-}
-
-
-var elementTypeFromWlxmlNode = function(wlxmlNode) {
-    return wlxmlNode.nodeType === Node.TEXT_NODE ? DocumentTextElement : DocumentNodeElement;
-}
+    this.state = {
+        exposed: false,
+        active: false
+    };
 
-$.extend(DocumentElement, {
-    create: function(node, canvas) {
-        return elementTypeFromWlxmlNode(node).create(node, canvas);
-    },
-
-    createDOM: function(wlxmlNode) {
-        return elementTypeFromParams(wlxmlNode).createDOM(params);
-    },
-
-    fromHTMLElement: function(htmlElement, canvas) {
-        var $element = $(htmlElement);
-        if(htmlElement.nodeType === Node.ELEMENT_NODE && $element.attr('document-node-element') !== undefined)
-            return DocumentNodeElement.fromHTMLElement(htmlElement, canvas);
-        if($element.attr('document-text-element') !== undefined || (htmlElement.nodeType === Node.TEXT_NODE && $element.parent().attr('document-text-element') !== undefined))
-            return DocumentTextElement.fromHTMLElement(htmlElement, canvas);
-        return undefined;
-    }
-});
+    this.dom = this.createDOM();
+    this.dom.data('canvas-element', this);
+};
 
 $.extend(DocumentElement.prototype, {
-    _setupDOMHandler: function(htmlElement) {
-        this.$element = $(htmlElement);
-    },
-    bound: function() {
-        return $.contains(document.documentElement, this.dom()[0]);
-    },
-    dom: function() {
-        return this.$element;
-    },
-    data: function() {
-        var dom = this.dom(),
-            args = Array.prototype.slice.call(arguments, 0);
-        if(args.length === 2 && args[1] === undefined)
-            return dom.removeData(args[0]);
-        return dom.data.apply(dom, arguments);
+    refreshPath: function() {
+        this.parents().forEach(function(parent) {
+            parent.refresh();
+        });
+        this.refresh();
+    },
+    refresh: function() {
+        // noop
+    },
+    updateState: function(toUpdate) {
+        var changes = {};
+        _.keys(toUpdate)
+            .filter(function(key) {
+                return this.state.hasOwnProperty(key);
+            }.bind(this))
+            .forEach(function(key) {
+                if(this.state !== toUpdate[key]) {
+                    this.state[key] = changes[key] = toUpdate[key];
+                }
+            }.bind(this));
+        if(_.isFunction(this.onStateChange)) {
+            this.onStateChange(changes);
+            if(_.isBoolean(changes.active)) {
+                if(changes.active) {
+                    var ptr = this;
+                    while(ptr && ptr.wlxmlNode.getTagName() === 'span') {
+                        ptr = ptr.parent();
+                    }
+                    if(ptr && ptr.gutterGroup) {
+                        ptr.gutterGroup.show();
+                    }
+                }
+            }
+        }
     },
     parent: function() {
-        var parents = this.$element.parents('[document-node-element]');
-        if(parents.length)
-            return DocumentElement.fromHTMLElement(parents[0], this.canvas);
+        var parents = this.dom.parents('[document-node-element]');
+        if(parents.length) {
+            return this.canvas.getDocumentElement(parents[0]);
+        }
         return null;
     },
 
@@ -77,203 +75,102 @@ $.extend(DocumentElement.prototype, {
     },
 
     sameNode: function(other) {
-        return other && (typeof other === typeof this) && other.dom()[0] === this.dom()[0];
+        return other && (typeof other === typeof this) && other.dom[0] === this.dom[0];
     },
 
-    wrapWithNodeElement: function(wlxmlNode) {
-        var wrapper = DocumentNodeElement.create({tag: wlxmlNode.tag, klass: wlxmlNode.klass}, this);
-        this.dom().replaceWith(wrapper.dom());
-        wrapper.append(this);
-        return wrapper;
-    },
-
-    markAsCurrent: function() {
-        this.canvas.markAsCurrent(this);
-    },
-
-    getVerticallyFirstTextElement: function() {
-        var toret;
-        this.children().some(function(child) {
-            if(!child.isVisible())
-                return false; // continue
-            if(child instanceof DocumentTextElement) {
-                toret = child;
-                return true; // break
-            } else {
-                toret = child.getVerticallyFirstTextElement();
-                if(toret)
-                    return true; // break
-            }
-        });
-        return toret;
-    },
-
-    getPreviousTextElement: function(includeInvisible) {
-        return this.getNearestTextElement('above', includeInvisible);
-    },
-
-    getNextTextElement: function(includeInvisible) {
-        return this.getNearestTextElement('below', includeInvisible);
-    },
-
-    getNearestTextElement: function(direction, includeInvisible) {
-        includeInvisible = includeInvisible !== undefined ? includeInvisible : false;
-        var selector = '[document-text-element]' + (includeInvisible ? '' : ':visible');
-        return this.canvas.getDocumentElement(utils.nearestInDocumentOrder(selector, direction, this.dom()[0]));
-    },
-
-    isVisible: function() {
-        return this instanceof DocumentTextElement || this.getWlxmlTag() !== 'metadata';
-    },
+    trigger: function() {
+        this.canvas.eventBus.trigger.apply(this.canvas.eventBus, Array.prototype.slice.call(arguments, 0));
+    }
 
-    isInsideList: function() {
-        return this.parents().some(function(parent) {
-            return parent.is('list');
-        });
-    },
 
-    exec: function(method) {
-        var manager = this.data('_wlxmlManager');
-        if(manager[method])
-            return manager[method].apply(manager, Array.prototype.slice.call(arguments, 1));
-    }
 });
 
 
 // DocumentNodeElement represents an element node from WLXML document rendered inside Canvas
-var DocumentNodeElement = function(htmlElement, canvas) {
-    DocumentElement.call(this, htmlElement, canvas);
+var DocumentNodeElement = function(wlxmlNode, canvas) {
+    DocumentElement.call(this, wlxmlNode, canvas);
+    wlxmlNode.setData('canvasElement', this);
+    this.init(this.dom);
 };
 
-$.extend(DocumentNodeElement, {
-    create: function(wlxmlNode, canvas) {
-        return this.fromHTMLElement(this.createDOM(wlxmlNode, canvas)[0], canvas);
-    },
-
-    fromHTMLElement: function(htmlElement, canvas) {
-        return new this(htmlElement, canvas);
-    },
-
-    createDOM: function(wlxmlNode, canvas) {
-        var dom = $('<div>')
-                .attr('document-node-element', ''),
-            widgetsContainer = $('<div>')
-                .addClass('canvas-widgets')
-                .attr('contenteditable', false),
-            container = $('<div>')
-                .attr('document-element-content', '');
-        
-        dom.append(widgetsContainer, container);
-        // Make sure widgets aren't navigable with arrow keys
-        widgetsContainer.find('*').add(widgetsContainer).attr('tabindex', -1);
-
-        var element = this.fromHTMLElement(dom[0], canvas);
-
-        element.data('wlxmlNode', wlxmlNode);
-        wlxmlNode.setData('canvasElement', element);
-
-        element.setWlxml({tag: wlxmlNode.getTagName(), klass: wlxmlNode.getClass()});
-
-        _.keys(wlxmlNode.getMetaAttributes()).forEach(function(key) {
-            element.setWlxmlMetaAttr(key, params.meta[key]);
-        });
-
-        wlxmlNode.contents().forEach((function(node) {
-            container.append(DocumentElement.create(node).dom());
-        }).bind(this));
-
-        return dom;
-    }
-
-});
 
 var manipulate = function(e, params, action) {
     var element;
     if(params instanceof DocumentElement) {
         element = params;
     } else {
-        element = DocumentElement.create(params);
+        element = e.canvas.createElement(params);
+    }
+    if(element.dom) {
+        e.dom[action](element.dom);
+        e.refreshPath();
     }
-    var target = (action === 'append' || action === 'prepend') ? e._container() : e.dom();
-    target[action](element.dom());
     return element;
 };
 
-DocumentNodeElement.prototype = new DocumentElement();
+DocumentNodeElement.prototype = Object.create(DocumentElement.prototype);
 
 
 $.extend(DocumentNodeElement.prototype, {
-    _container: function() {
-        return this.dom().children('[document-element-content]');
+    defaultDisplayStyle: 'block',
+    init: function() {},
+    addWidget: function(widget) {
+        this.dom.children('.canvas-widgets').append(widget.DOM ? widget.DOM : widget);
+    },
+    clearWidgets: function() {
+        this.dom.children('.canvas-widgets').empty();
+    },
+    addToGutter: function(view) {
+        if(!this.gutterGroup) {
+            this.gutterGroup = this.canvas.gutter.createViewGroup({
+                offsetHint: function() {
+                    return this.canvas.getElementOffset(this);
+                }.bind(this)
+            }, this);
+        }
+        this.gutterGroup.addView(view);
     },
-    detach: function() {
-        var parent = this.parent();
-        if(!parent)
-            return;
-
-        var parentChildren = parent.children(),
-            myIdx = parent.childIndex(this);
-
-        if(myIdx > 0 && myIdx < parentChildren.length) {
-            if((parentChildren[myIdx-1] instanceof DocumentTextElement) && (parentChildren[myIdx+1] instanceof DocumentTextElement)) {
-                parentChildren[myIdx-1].appendText(parentChildren[myIdx+1].getText());
-                parentChildren[myIdx+1].detach();
-            }
+    handle: function(event) {
+        var method = 'on' + event.type[0].toUpperCase() + event.type.substr(1);
+        if(this[method]) {
+            this[method](event);
         }
-        this.dom().detach();
-        this.canvas = null;
-        return this;
     },
-    unwrapContents: function() {
-        var parent = this.parent();
-        if(!parent)
-            return;
-
-        var parentChildren = parent.children(),
-            myChildren = this.children(),
-            myIdx = parent.childIndex(this);
-
-        if(myChildren.length === 0)
-            return this.detach();
-
-        var moveLeftRange, moveRightRange, leftMerged;
+    createDOM: function() {
+        var wrapper = $('<div>').attr('document-node-element', ''),
+            widgetsContainer = $('<div>')
+                .addClass('canvas-widgets')
+                .attr('contenteditable', false),
+            contentContainer = $('<div>')
+                .attr('document-element-content', '');
+        
+        wrapper.append(contentContainer, widgetsContainer);
+        widgetsContainer.find('*').add(widgetsContainer).attr('tabindex', -1);
+        return wrapper;
+    },
+    _container: function() {
+        return this.dom.children('[document-element-content]');
+    },
+    detach: function(isChild) {
+        var parents;
 
-        if(myIdx > 0 && (parentChildren[myIdx-1] instanceof DocumentTextElement) && (myChildren[0] instanceof DocumentTextElement)) {
-            parentChildren[myIdx-1].appendText(myChildren[0].getText());
-            myChildren[0].detach();
-            moveLeftRange = true;
-            leftMerged = true;
-        } else {
-            leftMerged = false;
+        if(this.gutterGroup) {
+            this.gutterGroup.remove();
+        }
+        if(_.isFunction(this.children)) {
+            this.children().forEach(function(child) {
+                child.detach(true);
+            });
         }
 
-        if(!(leftMerged && myChildren.length === 1)) {
-            if(myIdx < parentChildren.length - 1 && (parentChildren[myIdx+1] instanceof DocumentTextElement) && (myChildren[myChildren.length-1] instanceof DocumentTextElement)) {
-                parentChildren[myIdx+1].prependText(myChildren[myChildren.length-1].getText());
-                myChildren[myChildren.length-1].detach();
-                moveRightRange = true;
+        if(!isChild) {
+            parents = this.parents();
+            this.dom.detach();
+            if(parents[0]) {
+                parents[0].refreshPath();
             }
         }
-
-        var childrenLength = this.children().length;
-        this.children().forEach(function(child) {
-            this.before(child);
-        }.bind(this));
-
-        this.detach();
-
-        return {
-            element1: parent.children()[myIdx + (moveLeftRange ? -1 : 0)],
-            element2: parent.children()[myIdx + childrenLength-1 + (moveRightRange ? 1 : 0)]
-        };
-    },
-    append: function(params) {
-        if(params.tag !== 'span')
-            this.data('orig-end', undefined);
-        return manipulate(this, params, 'append');
-    },
-    prepend: function(params) {
-        return manipulate(this, params, 'prepend');
+        return this;
     },
     before: function(params) {
         return manipulate(this, params, 'before');
@@ -282,183 +179,74 @@ $.extend(DocumentNodeElement.prototype, {
     after: function(params) {
         return manipulate(this, params, 'after');
     },
-    children: function() {
-        var toret = [];
-        if(this instanceof DocumentTextElement)
-            return toret;
-
 
-        var elementContent = this._container().contents();
-        var element = this;
-        elementContent.each(function(idx) {
-            var childElement = DocumentElement.fromHTMLElement(this, element.canvas);
-            if(childElement === undefined)
-                return true;
-            if(idx === 0 && elementContent.length > 1 && elementContent[1].nodeType === Node.ELEMENT_NODE && (childElement instanceof DocumentTextElement) && $.trim($(this).text()) === '')
-                return true;
-            if(idx > 0 && childElement instanceof DocumentTextElement) {
-                if(toret[toret.length-1] instanceof DocumentNodeElement && $.trim($(this).text()) === '')
-                    return true;
-            }
-            toret.push(childElement);
-        });
-        return toret;
-    },
-    childIndex: function(child) {
-        var children = this.children(),
-            toret = null;
-        children.forEach(function(c, idx) {
-            if(c.sameNode(child)) {
-                toret = idx;
-                return false;
-            }
-        });
-        return toret;
-    },
-    getWlxmlTag: function() {
-        return this._container().attr('wlxml-tag');
+    isBlock: function() {
+        return this.dom.css('display') === 'block';
     },
-    setWlxmlTag: function(tag) {
-        if(tag === this.getWlxmlTag())
-            return;
 
-        this._container().attr('wlxml-tag', tag);
-        if(!this.__updatingWlxml)
-            this._updateWlxmlManager();
+    displayAsBlock: function() {
+        this.dom.css('display', 'block');
+        this._container().css('display', 'block');
     },
-    getWlxmlClass: function() {
-        var klass = this._container().attr('wlxml-class');
-        if(klass)
-            return klass.replace(/-/g, '.');
-        return undefined;
+    displayInline: function() {
+        this.dom.css('display', 'inline');
+        this._container().css('display', 'inline');
     },
-    setWlxmlClass: function(klass) {
-        if(klass === this.getWlxmlClass())
-            return;
-
-        this.getWlxmlMetaAttrs().forEach(function(attr) {
-            if(!classAttributes.hasMetaAttr(klass, attr.name))
-                this.dom().removeAttr('wlxml-meta-' + attr.name);
-        }, this);
-
-        if(klass)
-            this._container().attr('wlxml-class', klass.replace(/\./g, '-'));
-        else
-            this._container().removeAttr('wlxml-class');
-        if(!this.__updatingWlxml)
-            this._updateWlxmlManager();
-    },
-    setWlxml: function(params) {
-        this.__updatingWlxml = true;
-        if(params.tag !== undefined)
-            this.setWlxmlTag(params.tag);
-        if(params.klass !== undefined)
-            this.setWlxmlClass(params.klass);
-        this._updateWlxmlManager();
-        this.__updatingWlxml = false;
-    },
-    _updateWlxmlManager: function() {
-        var manager = wlxmlManagers.getFor(this);
-        this.data('_wlxmlManager', manager);
-        manager.setup();
-    },
-    is: function(what) {
-        if(what === 'list' && _.contains(['list.items', 'list.items.enum'], this.getWlxmlClass()))
-            return true;
-        return false;
-    },
-
-    getWlxmlMetaAttr: function(attr) {
-        return this.dom().attr('wlxml-meta-'+attr);
-    },
-
-    getWlxmlMetaAttrs: function() {
-        var toret = [];
-        var attrList = classAttributes.getMetaAttrsList(this.getWlxmlClass());
-        attrList.all.forEach(function(attr) {
-            toret.push({name: attr.name, value: this.getWlxmlMetaAttr(attr.name) || ''});
-        }, this);
-        return toret;
-    },
-
-    setWlxmlMetaAttr: function(attr, value) {
-        this.dom().attr('wlxml-meta-'+attr, value);
-    },
-    
-    toggleLabel: function(toggle) {
-        var displayCss = toggle ? 'inline-block' : 'none';
-        var label = this.dom().children('.canvas-widgets').find('.canvas-widget-label');
-        label.css('display', displayCss);
-        this.toggleHighlight(toggle);
-    },
-
-    toggleHighlight: function(toggle) {
-        this._container().toggleClass('highlighted-element', toggle);
-    },
-
-    toggle: function(toggle) {
-        var mng = this.data('_wlxmlManager');
-        if(mng) {
-            mng.toggle(toggle);
-        }
+    displayAs: function(what) {
+        // [this.dom(), this._container()].forEach(e) {
+        //     var isBlock = window.getComputedStyle(e).display === 'block';
+        //     if(!isBlock && what === 'block') {
+        //         e.css('display', what);
+        //     } else if(isBlock && what === 'inline') {
+        //         e.css('display')
+        //     }
+        // })
+        this.dom.css('display', what);
+        this._container().css('display', what);
     }
 });
 
 
 // DocumentNodeElement represents a text node from WLXML document rendered inside Canvas
-var DocumentTextElement = function(htmlElement, canvas) {
-    DocumentElement.call(this, htmlElement, canvas);
+var DocumentTextElement = function(wlxmlTextNode, canvas) {
+    DocumentElement.call(this, wlxmlTextNode, canvas);
 };
 
 $.extend(DocumentTextElement, {
-    createDOM: function(wlxmlTextNode) {
-        var dom = $('<div>')
-            .attr('document-text-element', '')
-            .text(wlxmlTextNode.getText() || utils.unicode.ZWS),
-        element = this.fromHTMLElement(dom[0], this);
-        element.data('wlxmlNode', wlxmlTextNode);
-        return dom;
-    },
-
-    create: function(wlxmlTextNode, canvas) {
-        return this.fromHTMLElement(this.createDOM(wlxmlTextNode)[0]);
-    },
-
-    fromHTMLElement: function(htmlElement, canvas) {
-        return new this(htmlElement, canvas);
-    },
     isContentContainer: function(htmlElement) {
         return htmlElement.nodeType === Node.TEXT_NODE && $(htmlElement).parent().is('[document-text-element]');
     }
 });
 
-DocumentTextElement.prototype = new DocumentElement();
+DocumentTextElement.prototype = Object.create(DocumentElement.prototype);
 
 $.extend(DocumentTextElement.prototype, {
-    _setupDOMHandler: function(htmlElement) {
-        var $element = $(htmlElement);
-        if(htmlElement.nodeType === Node.TEXT_NODE)
-            this.$element = $element.parent();
-        else
-            this.$element = $element;
+    createDOM: function() {
+        var dom = $('<div>')
+            .attr('document-text-element', '')
+            .text(this.wlxmlNode.getText() || utils.unicode.ZWS);
+        return dom;
     },
-    detach: function() {
-        this.dom().detach();
-        this.canvas = null;
+    detach: function(isChild) {
+        if(!isChild) {
+            this.dom.detach();
+        }
         return this;
     },
     setText: function(text) {
-        this.dom().contents()[0].data = text;
-    },
-    appendText: function(text) {
-        this.dom().contents()[0].data += text;
+        if(text === '') {
+            text = utils.unicode.ZWS;
+        }
+        if(text !== this.getText()) {
+            this.dom.contents()[0].data = text;
+        }
     },
-    prependText: function(text) {
-        this.dom().contents()[0].data = text + this.dom().contents()[0].data;
+    handle: function(event) {
+        this.setText(event.meta.node.getText());
     },
     getText: function(options) {
         options = _.extend({raw: false}, options || {});
-        var toret = this.dom().text();
+        var toret = this.dom.text();
         if(!options.raw) {
             toret = toret.replace(utils.unicode.ZWS, '');
         }
@@ -466,138 +254,52 @@ $.extend(DocumentTextElement.prototype, {
     },
     isEmpty: function() {
         // Having at least Zero Width Space is guaranteed be Content Observer
-        return this.dom().contents()[0].data === utils.unicode.ZWS;
+        return this.dom.contents()[0].data === utils.unicode.ZWS;
     },
     after: function(params) {
-        if(params instanceof DocumentTextElement || params.text)
+        if(params instanceof DocumentTextElement || params.text) {
             return false;
+        }
         var element;
         if(params instanceof DocumentNodeElement) {
             element = params;
         } else {
-            element = DocumentNodeElement.create(params, this.canvas);
+            element = this.canvas.createElement(params);
+        }
+        if(element.dom) {
+            this.dom.wrap('<div>');
+            this.dom.parent().after(element.dom);
+            this.dom.unwrap();
+            this.refreshPath();
         }
-        this.dom().wrap('<div>');
-        this.dom().parent().after(element.dom());
-        this.dom().unwrap();
         return element;
     },
     before: function(params) {
-        if(params instanceof DocumentTextElement || params.text)
+        if(params instanceof DocumentTextElement || params.text) {
             return false;
+        }
         var element;
         if(params instanceof DocumentNodeElement) {
             element = params;
         } else {
-            element = DocumentNodeElement.create(params, this.canvas);
-        }
-        this.dom().wrap('<div>');
-        this.dom().parent().before(element.dom());
-        this.dom().unwrap();
-        return element;
-    },
-    wrapWithNodeElement: function(wlxmlNode) {
-        if(typeof wlxmlNode.start === 'number' && typeof wlxmlNode.end === 'number') {
-            return this.canvas.wrapText({
-                inside: this.parent(),
-                textNodeIdx: this.parent().childIndex(this),
-                offsetStart: Math.min(wlxmlNode.start, wlxmlNode.end),
-                offsetEnd: Math.max(wlxmlNode.start, wlxmlNode.end),
-                _with: {tag: wlxmlNode.tag, klass: wlxmlNode.klass}
-            });
-        } else {
-            return DocumentElement.prototype.wrapWithNodeElement.call(this, wlxmlNode);
+            element = this.canvas.createElement(params);
         }
-    },
-    unwrap: function() {
-        var parent = this.parent(),
-            toret;
-        if(parent.children().length === 1) {
-            toret = parent.parent();
-            var grandParent = parent.parent();
-            if(grandParent) {
-                var grandParentChildren = grandParent.children(),
-                    idx = grandParent.childIndex(parent),
-                    prev = idx - 1 > -1 ? grandParentChildren[idx-1] : null,
-                    next = idx + 1 < grandParentChildren.length ? grandParentChildren[idx+1] : null;
-                
-                prev = (prev instanceof DocumentTextElement) ? prev : null;
-                next = (next instanceof DocumentTextElement) ? next : null;
-
-                if(prev && next) {
-                    prev.setText(prev.getText() + this.getText() + next.getText());
-                    next.detach();
-                } else if (prev || next) {
-                    var target = prev ? prev : next,
-                        newText = prev ? target.getText() + this.getText() : this.getText() + target.getText();
-                    target.setText(newText);
-                } else {
-                    parent.after(this);
-                }
-            } else {
-                parent.after(this);
-            }
-            parent.detach();
-            return toret;
+        if(element.dom) {
+            this.dom.wrap('<div>');
+            this.dom.parent().before(element.dom);
+            this.dom.unwrap();
+            this.refreshPath();
         }
-    },
-    split: function(params) {
-        var parentElement = this.parent(),
-            myIdx = parentElement.childIndex(this),
-            myCanvas = this.canvas,
-            passed = false,
-            succeedingChildren = [],
-            thisElement = this,
-            prefix = this.getText().substr(0, params.offset),
-            suffix = this.getText().substr(params.offset);
-
-        parentElement.children().forEach(function(child) {
-            if(passed)
-                succeedingChildren.push(child);
-            if(child.sameNode(thisElement))
-                passed = true;
-        });
-
-        if(prefix.length > 0)
-            this.setText(prefix);
-        else
-            this.detach();
-        
-        var newElement = DocumentNodeElement.create({tag: parentElement.getWlxmlTag(), klass: parentElement.getWlxmlClass()}, myCanvas);
-        parentElement.after(newElement);
-
-        if(suffix.length > 0)
-            newElement.append({text: suffix});
-        succeedingChildren.forEach(function(child) {
-            newElement.append(child);
-        });
-
-        return {first: parentElement, second: newElement};
-    },
-    divide: function(params) {
-        var myText = this.getText();
-
-        if(params.offset === myText.length)
-            return this.after(params);
-        if(params.offset === 0)
-            return this.before(params);
-
-        var lhsText = myText.substr(0, params.offset),
-            rhsText = myText.substr(params.offset),
-            newElement = DocumentNodeElement.create({tag: params.tag, klass: params.klass}, this.canvas),
-            rhsTextElement = DocumentTextElement.create({text: rhsText});
-
-        this.setText(lhsText);
-        this.after(newElement);
-        newElement.after(rhsTextElement);
-        return newElement;
+        return element;
     },
 
-    toggleHighlight: function() {
-        // do nothing for now
+    children: function() {
+        return [];
     }
+
 });
 
+
 return {
     DocumentElement: DocumentElement,
     DocumentNodeElement: DocumentNodeElement,