Preventing browser from removing node when last character gets deleted via backspace

[fnpeditor.git] / modules / documentCanvas / documentCanvas.js

diff --git a/modules/documentCanvas/documentCanvas.js b/modules/documentCanvas/documentCanvas.js
index df11ea0..4e61b88 100644 (file)
--- a/modules/documentCanvas/documentCanvas.js
+++ b/modules/documentCanvas/documentCanvas.js
@@ -6,13 +6,15 @@ define([
 './wlxmlNode',\r
 'libs/text!./template.html'], function(_, transformations, wlxmlNode, template) {\r
 \r
-\r
+'use strict';\r
 \r
 return function(sandbox) {\r
 \r
     var view = {\r
         node: $(_.template(template)()),\r
         currentNode: null,\r
+        shownAlready: false,\r
+        scrollbarPosition: 0,\r
         setup: function() {\r
             var view = this;\r
 \r
@@ -49,24 +51,30 @@ return function(sandbox) {
                     e.preventDefault();\r
                     view.insertNewNode(null, null);\r
                 }\r
+                if(e.which === 8) {\r
+                    var anchor = window.getSelection().anchorNode;\r
+                    var len = anchor.length;\r
+                    console.log(len);\r
+                    if(len === 1) {\r
+                        e.preventDefault();\r
+                        $(anchor).parent().text('');\r
+                    }\r
+                }\r
             });\r
-            \r
-            \r
-            var observer = new MutationObserver(function(mutations) {\r
-              mutations.forEach(function(mutation) {\r
-                _.each(mutation.addedNodes, function(node) {\r
-                    node = $(node);\r
-                    node.parent().find('[wlxml-tag]').each(function() {\r
-                        tag = $(this);\r
-                        if(!tag.attr('id'))\r
-                            tag.attr('id', 'xxxxxxxx-xxxx-xxxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {var r = Math.random()*16|0,v=c=='x'?r:r&0x3|0x8;return v.toString(16);}));\r
-                    });\r
-                });\r
-              });    \r
-            });\r
-            var config = { attributes: true, childList: true, characterData: true, subtree: true };\r
-            observer.observe(this.node.find('#rng-module-documentCanvas-contentWrapper')[0], config);\r
-            \r
+                      \r
+            this.node.onShow = function() {\r
+                if(!view.shownAlready) {\r
+                    view.shownAlready = true;\r
+                    view.selectFirstNode();\r
+                } else if(view.currentNode) {\r
+                    view.movecaretToNode(view.getNodeElement(view.currentNode));\r
+                    view.node.find('#rng-module-documentCanvas-contentWrapper').scrollTop(view.scrollbarPosition);\r
+                }\r
+            };\r
+            this.node.onHide = function() {\r
+                view.scrollbarPosition = view.node.find('#rng-module-documentCanvas-contentWrapper').scrollTop();\r
+            }\r
+                      \r
             this.gridToggled = false;\r
         },\r
         _createNode: function(wlxmlTag, wlxmlClass) {\r
@@ -76,6 +84,7 @@ return function(sandbox) {
             toret.attr('wlxml-tag', wlxmlTag);\r
             if(wlxmlClass)\r
                 toret.attr('wlxml-class', wlxmlClass);\r
+            toret.attr('id', 'xxxxxxxx-xxxx-xxxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {var r = Math.random()*16|0,v=c=='x'?r:r&0x3|0x8;return v.toString(16);}));\r
             return toret;\r
         },\r
         insertNewNode: function(wlxmlTag, wlxmlClass) {\r
@@ -100,7 +109,7 @@ return function(sandbox) {
                 anchor.before(newNode)\r
             else\r
                 anchor.after(newNode);\r
-            this.selectNode(newNode);\r
+            this.selectNode(new wlxmlNode.Node(newNode), {movecaret: true});\r
             //isDirty = true;\r
             sandbox.publish('contentChanged');\r
         },\r
@@ -124,7 +133,7 @@ return function(sandbox) {
                 newNode.before(prefix);\r
                 newNode.after(suffix);\r
                 \r
-                this.selectNode(newNode);\r
+                this.selectNode(new wlxmlNode.Node(newNode), {movecaret: true});\r
                 //isDirty = true;\r
                 sandbox.publish('contentChanged');\r
             }\r
@@ -151,7 +160,7 @@ return function(sandbox) {
                 newNode.before(prefixNode);\r
                 newNode.after(suffixNode);\r
                 \r
-                this.selectNode(newNode);\r
+                this.selectNode(new wlxmlNode.Node(newNode), {movecaret: true});\r
                 //isDirty = true;\r
                 sandbox.publish('contentChanged');\r
             }\r
@@ -171,13 +180,8 @@ return function(sandbox) {
             this.node.find('.rng-module-documentCanvas-currentNode').removeClass('rng-module-documentCanvas-currentNode');\r
             nodeElement.addClass('rng-module-documentCanvas-currentNode');\r
              \r
-            if(options.moveCarret) {\r
-                var range = document.createRange();\r
-                range.selectNodeContents(nodeElement[0]);\r
-                range.collapse(false);\r
-                var selection = document.getSelection();\r
-                selection.removeAllRanges()\r
-                selection.addRange(range);\r
+            if(options.movecaret) {\r
+                this.movecaretToNode(nodeElement);\r
             }\r
             \r
             this.currentNode = wlxmlNode;\r
@@ -211,7 +215,7 @@ return function(sandbox) {
             else {\r
                 node = this.node.find('[wlxml-class|="p"]')\r
             }\r
-            this.selectNode(new wlxmlNode.Node(node));\r
+            this.selectNode(new wlxmlNode.Node(node), {movecaret: true});\r
         },\r
         toggleGrid: function(toggle) {\r
             this.node.find('[wlxml-tag]').toggleClass('rng-common-hoveredNode', toggle);\r
@@ -219,6 +223,14 @@ return function(sandbox) {
         },\r
         getNodeElement: function(wlxmlNode) {\r
             return this.node.find('#'+wlxmlNode.id);\r
+        },\r
+        movecaretToNode: function(nodeElement) {\r
+            var range = document.createRange();\r
+            range.selectNodeContents(nodeElement[0]);\r
+            range.collapse(false);\r
+            var selection = document.getSelection();\r
+            selection.removeAllRanges()\r
+            selection.addRange(range);\r
         }\r
     };\r
     \r
@@ -227,11 +239,12 @@ return function(sandbox) {
     /* public api */\r
     return {\r
         start: function() { sandbox.publish('ready'); },\r
-        getView: function() { return view.node; },\r
+        getView: function() { \r
+            return view.node;\r
+        },\r
         setDocument: function(xml) {\r
             var transformed = transformations.fromXML.getDocumentDescription(xml);\r
             view.setBody(transformed.HTMLTree);\r
-            view.selectFirstNode();\r
             sandbox.publish('documentSet');\r
         },\r
         getDocument: function() {\r
@@ -239,8 +252,8 @@ return function(sandbox) {
         },\r
         modifyCurrentNode: function(attr, value) {\r
             if(view.currentNode) {\r
-                view.currentNode.attr('wlxml-'+attr, value);\r
-                sandbox.publish('contentEdited');\r
+                view.getNodeElement(view.currentNode).attr('wlxml-'+attr, value);\r
+                sandbox.publish('contentChanged');\r
             }\r
         },\r
         highlightNode: function(wlxmlNode) {\r
@@ -251,7 +264,7 @@ return function(sandbox) {
         },\r
         selectNode: function(wlxmlNode) {\r
             if(!wlxmlNode.is(view.currentNode))\r
-                view.selectNode(wlxmlNode, {moveCarret: true});\r
+                view.selectNode(wlxmlNode, {movecaret: true});\r
         },\r
         toggleGrid: function(toggle) {\r
             view.toggleGrid(toggle);\r