Handling backspace on empty text element (wip)

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

diff --git a/modules/documentCanvas/canvas/canvas.js b/modules/documentCanvas/canvas/canvas.js
index cb9fb69..e706428 100644 (file)
--- a/modules/documentCanvas/canvas/canvas.js
+++ b/modules/documentCanvas/canvas/canvas.js
@@ -1,13 +1,15 @@
 define([
 'libs/jquery-1.9.1.min',
 'libs/underscore-min',
+'libs/backbone-min',
 'modules/documentCanvas/canvas/documentElement',
 'modules/documentCanvas/canvas/utils'
-], function($, _, documentElement, utils) {
+], function($, _, Backbone, documentElement, utils) {
     
 'use strict';
 
 var Canvas = function(wlxml, publisher) {
+    this.eventBus = _.extend({}, Backbone.Events);
     this.loadWlxml(wlxml);
     this.publisher = publisher ? publisher : function() {};
 };
@@ -19,7 +21,8 @@ $.extend(Canvas.prototype, {
         if(d) {
             this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
             this.wrapper.append(d);
-            
+            var canvas = this;
+
             this.wrapper.find('*').replaceWith(function() {
                 var currentTag = $(this);
                 if(currentTag.attr('wlxml-tag'))
@@ -40,7 +43,7 @@ $.extend(Canvas.prototype, {
                     meta: meta,
                     others: others,
                     rawChildren: currentTag.contents()
-                });
+                }, canvas);
 
                 ['orig-before', 'orig-after', 'orig-begin', 'orig-end'].forEach(function(attr) {
                     element.data(attr, '');
@@ -137,14 +140,19 @@ $.extend(Canvas.prototype, {
             
             this.d = this.wrapper.children(0);
 
-            var canvas = this;
             this.wrapper.on('keydown', function(e) {
                 if(e.which === 13) { 
                     e.preventDefault();
                     var cursor = canvas.getCursor();
                     if(!cursor.isSelecting()) {
                         var position = cursor.getPosition(),
-                            elements = position.element.split({offset: position.offset}),
+                            element = position.element;
+
+                        if(!(element.parent().parent())) {
+                            return false; // top level element is unsplittable
+                        }
+
+                        var elements = position.element.split({offset: position.offset}),
                             newEmpty,
                             goto;
 
@@ -165,7 +173,8 @@ $.extend(Canvas.prototype, {
                 ARROW_LEFT: 37,
                 ARROW_UP: 38,
                 ARROW_RIGHT: 39,
-                ARROW_DOWN: 40
+                ARROW_DOWN: 40,
+                BACKSPACE: 8
             }
 
             this.wrapper.on('keyup', function(e) {
@@ -189,9 +198,10 @@ $.extend(Canvas.prototype, {
             });
          
             this.wrapper.on('keydown', function(e) {
+                var position = canvas.getCursor().getPosition(),
+                    element = position.element;
                 if(e.which >= 37 && e.which <= 40) {
-                    var position = canvas.getCursor().getPosition(),
-                        element = position.element;
+
                     if(element && (element instanceof documentElement.DocumentTextElement)) {
                         if(element.isEmpty()) {
                             var direction, caretTo;
@@ -219,6 +229,34 @@ $.extend(Canvas.prototype, {
 
 
                 }
+                if(e.which === KEYS.BACKSPACE) {
+                    if(element.getText().length === 1) {
+                        e.preventDefault();
+                        element.setText('');
+                    }
+                    else if(element.isEmpty()) {
+                        e.preventDefault();
+
+                        var parent = element.parent(),
+                            grandParent = parent ? parent.parent() : null,
+                            goto;
+                        if(parent.children().length === 1) {
+                            if(grandParent && grandParent.children().length === 1) {
+                                goto = grandParent.append({text: ''});
+                            } else {
+                                goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', 'above', element.dom()[0]));
+                            }
+                            parent.detach();
+                        } else {
+                            goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', 'above', element.dom()[0]));
+                            element.detach();
+                        }
+                        canvas.setCurrentElement(goto, {caretTo: 'end'});
+                    }
+                    else if(position.offset === 0) {
+                        // todo
+                    }
+                }
             });
 
             this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
@@ -255,6 +293,13 @@ $.extend(Canvas.prototype, {
                 el.toggleLabel(false);
             });
 
+            this.eventBus.on('elementToggled', function(toggle, element) {
+                if(!toggle) {
+                    element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', 'above', element.dom()[0]));
+                    canvas.setCurrentElement(element);
+                }
+            })
+
         } else {
             this.d = null;
         }
@@ -310,6 +355,59 @@ $.extend(Canvas.prototype, {
             wrapperElement.after({text: suffixOutside});
         return wrapperElement;
     },
+
+    wrapElements: function(params) {
+        if(!(params.element1.parent().sameNode(params.element2.parent())))
+            return;
+
+        var parent = params.element1.parent(),
+            parentChildren = parent.children(),
+            wrapper = documentElement.DocumentNodeElement.create({
+                tag: params._with.tag,
+                klass: params._with.klass}),
+            idx1 = parent.childIndex(params.element1),
+            idx2 = parent.childIndex(params.element2);
+
+        if(idx1 > idx2) {
+            var tmp = idx1;
+            idx1 = idx2;
+            idx2 = tmp;
+        }
+
+        var insertingMethod, insertingTarget;
+        if(idx1 === 0) {
+            insertingMethod = 'prepend';
+            insertingTarget = parent;
+        } else {
+            insertingMethod = 'after';
+            insertingTarget = parentChildren[idx1-1];
+        }
+
+        for(var i = idx1; i <= idx2; i++) {
+            wrapper.append(parentChildren[i].detach());
+        }
+
+        insertingTarget[insertingMethod](wrapper);
+        return wrapper;
+    },
+
+    getSiblingParents: function(params) {
+        var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
+            parents2 = [params.element2].concat(params.element2.parents()).reverse(),
+            noSiblingParents = null;
+
+        if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
+            return noSiblingParents;
+
+        var i;
+        for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
+            if(parents1[i].sameNode(parents2[i]))
+                continue;
+            break;
+        }
+        return {element1: parents1[i], element2: parents2[i]};
+    },
+
     getDocumentElement: function(from) {
         if(from instanceof HTMLElement || from instanceof Text) {
            return documentElement.DocumentElement.fromHTMLElement(from, this);
@@ -617,7 +715,7 @@ $.extend(Cursor.prototype, {
                 element: focusElement,
                 offset: getOffset('focus'),
                 offsetAtBeginning: getOffset('focus') === 0,
-                offsetAtEnd: selection.focusElement.data.length === getOffset('focus')
+                offsetAtEnd: selection.focusNode.data.length === getOffset('focus')
             };
         }