+define([
+'modules/documentCanvas/canvas/documentElement',
+'modules/documentCanvas/canvas/utils'
+], function(documentElement, utils) {
+
+'use strict';
+
+
+var KEYS = {
+ ENTER: 13,
+ ARROW_LEFT: 37,
+ ARROW_UP: 38,
+ ARROW_RIGHT: 39,
+ ARROW_DOWN: 40,
+ BACKSPACE: 8,
+ DELETE: 46,
+ X: 88
+};
+
+var handleKey = function(event, canvas) {
+ handlers.some(function(handler) {
+ if(handles(handler, event) && handler[event.type]) {
+ handler[event.type](event, canvas);
+ return true;
+ }
+ });
+};
+
+var handles = function(handler, event) {
+ if(handler.key === event.which)
+ return true;
+ if(handler.keys && handler.keys.indexOf(event.which) !== -1)
+ return true;
+ return false;
+};
+
+var handlers = [];
+
+
+handlers.push({key: KEYS.ENTER,
+ keydown: function(event, canvas) {
+ event.preventDefault();
+ var cursor = canvas.getCursor(),
+ position = cursor.getPosition(),
+ element = position.element;
+
+ if(!cursor.isSelecting()) {
+ if(event.ctrlKey) {
+ var added = element.after({tag: 'block'});
+ added.append({text:''});
+ canvas.setCurrentElement(added, {caretTo: 'start'});
+
+ } else {
+
+ if(!(element.parent().parent())) {
+ return false; // top level element is unsplittable
+ }
+
+ var elements = position.element.split({offset: position.offset}),
+ newEmpty,
+ goto,
+ gotoOptions;
+
+ if(position.offsetAtBeginning)
+ newEmpty = elements.first;
+ else if(position.offsetAtEnd)
+ newEmpty = elements.second;
+
+ if(newEmpty) {
+ goto = newEmpty.append(documentElement.DocumentTextElement.create({text: ''}, this));
+ gotoOptions = {};
+ } else {
+ goto = elements.second;
+ gotoOptions = {caretTo: 'start'};
+ }
+
+ canvas.setCurrentElement(goto, gotoOptions);
+ }
+ }
+ }
+});
+
+handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
+ keydown: function(event, canvas) {
+ var position = canvas.getCursor().getPosition(),
+ element = position.element;
+ if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
+ var direction, caretTo;
+ if(event.which === KEYS.ARROW_LEFT || event.which === KEYS.ARROW_UP) {
+ direction = 'above';
+ caretTo = 'end';
+ } else {
+ direction = 'below';
+ caretTo = 'start';
+ }
+ var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
+ canvas.setCurrentElement(el, {caretTo: caretTo});
+ }
+ },
+ keyup: function(event, canvas) {
+ var element = canvas.getCursor().getPosition().element,
+ caretTo = false;
+ if(!element) {
+ // Chrome hack
+ var direction;
+ if(event.which === KEYS.ARROW_LEFT || event.which === KEYS.ARROW_UP) {
+ direction = 'above';
+ caretTo = 'end';
+ } else {
+ direction = 'below';
+ caretTo = 'start';
+ }
+ element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
+ }
+ canvas.setCurrentElement(element, {caretTo: caretTo});
+ }
+});
+
+
+var selectsWholeTextElement = function(cursor) {
+ if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
+ return true;
+ return false;
+}
+
+handlers.push({key: KEYS.X,
+ keydown: function(event, canvas) {
+ if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor()))
+ event.preventDefault();
+ }
+});
+
+handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
+ keydown: function(event, canvas) {
+ var cursor = canvas.getCursor(),
+ position = canvas.getCursor().getPosition(),
+ element = position.element;
+
+ if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
+ event.preventDefault();
+ return;
+ }
+
+ var cursorAtOperationEdge = position.offsetAtBeginning;
+ if(event.which === KEYS.DELETE) {
+ cursorAtOperationEdge = position.offsetAtEnd;
+ }
+
+ var willDeleteWholeText = function() {
+ return element.getText().length === 1 || selectsWholeTextElement(cursor);
+ }
+
+ if(willDeleteWholeText()) {
+ event.preventDefault();
+ element.setText('');
+ }
+ else if(element.isEmpty()) {
+
+ var direction = 'above',
+ caretTo = 'end';
+
+ if(event.which === KEYS.DELETE) {
+ direction = 'below';
+ caretTo = 'start';
+ }
+
+ event.preventDefault();
+
+ var parent = element.parent(),
+ grandParent = parent ? parent.parent() : null,
+ goto;
+ if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
+ if(grandParent && grandParent.children().length === 1) {
+ goto = grandParent.append({text: ''});
+ } else {
+ goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
+ }
+ parent.detach();
+ } else {
+ goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
+ element.detach();
+ }
+ canvas.setCurrentElement(goto, {caretTo: caretTo});
+ canvas.publisher('contentChanged');
+ }
+ else if(cursorAtOperationEdge) {
+ // todo
+ event.preventDefault();
+ }
+ }
+});
+
+return {
+ handleKey: handleKey
+};
+
+});
\ No newline at end of file