src/editor/modules/documentCanvas/canvas/keyboard.js

   1 define([
   2 'modules/documentCanvas/canvas/documentElement',
   3 'modules/documentCanvas/canvas/utils'
   4 ], function(documentElement, utils) {
   5
   6 'use strict';
   7
   8
   9 var KEYS = {
  10     ENTER: 13,
  11     ARROW_LEFT: 37,
  12     ARROW_UP: 38,
  13     ARROW_RIGHT: 39,
  14     ARROW_DOWN: 40,
  15     BACKSPACE: 8,
  16     DELETE: 46,
  17     X: 88
  18 };
  19
  20 var handleKey = function(event, canvas) {
  21     handlers.some(function(handler) {
  22         if(handles(handler, event) && handler[event.type]) {
  23             handler[event.type](event, canvas);
  24             return true;
  25         }
  26     });
  27 };
  28
  29 var handles = function(handler, event) {
  30     if(handler.key === event.which)
  31         return true;
  32     if(handler.keys && handler.keys.indexOf(event.which) !== -1)
  33         return true;
  34     return false;
  35 };
  36
  37 var handlers = [];
  38
  39
  40 handlers.push({key: KEYS.ENTER,
  41     keydown: function(event, canvas) {
  42         event.preventDefault();
  43         var cursor = canvas.getCursor(),
  44             position = cursor.getPosition(),
  45             element = position.element;
  46
  47         if(Object.keys(cursor.getPosition()).length === 0) {
  48             var currentElement = canvas.getCurrentNodeElement();
  49             if(currentElement) {
  50                 var added = currentElement.data('wlxmlNode').after({
  51                     tag: currentElement.getWlxmlTag() || 'div',
  52                     attrs: {'class': currentElement.getWlxmlClass() || 'p'}
  53                 });
  54                 added.append({text:''});
  55                 canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
  56             }
  57             return;
  58         }
  59
  60         if(!cursor.isSelecting()) {
  61             if(event.ctrlKey) {
  62                 if(element instanceof documentElement.DocumentTextElement) {
  63                     element = element.parent();
  64                 }
  65                 var added = element.data('wlxmlNode').after(
  66                     {tagName: element.getWlxmlTag() || 'div', attrs: {'class': element.getWlxmlClass() || 'p'}}
  67                 );
  68                 added.append({text: ''});
  69                 canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
  70
  71             } else {
  72
  73                 if(!(element.parent().parent())) {
  74                     return false; // top level element is unsplittable
  75                 }
  76
  77                 //var nodes = position.element.data('wlxmlNode').split({offset: position.offset}),
  78                 var nodes = position.element.data('wlxmlNode').transform('split', {offset: position.offset}),
  79                     newEmpty,
  80                     goto,
  81                     gotoOptions;
  82
  83                 if(position.offsetAtBeginning)
  84                     newEmpty = nodes.first;
  85                 else if(position.offsetAtEnd)
  86                     newEmpty = nodes.second;
  87
  88                 if(newEmpty) {
  89                     //goto = newEmpty.append({text: ''});
  90                     gotoOptions = {};
  91                 } else {
  92                     goto = nodes.second;
  93                     gotoOptions = {caretTo: 'start'};
  94                 }
  95
  96                 canvas.setCurrentElement(utils.findCanvasElement(goto), gotoOptions);
  97             }
  98         }
  99     }
 100 });
 101
 102 handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
 103     keydown: function(event, canvas) {
 104         var position = canvas.getCursor().getPosition(),
 105             element = position.element;
 106         if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
 107             var direction, caretTo;
 108             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 109                 direction = 'above';
 110                 caretTo = 'end';
 111             } else {
 112                 direction = 'below';
 113                 caretTo = 'start';
 114             }
 115             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 116             canvas.setCurrentElement(el, {caretTo: caretTo});
 117         }
 118     },
 119     keyup: function(event, canvas) {
 120         var element = canvas.getCursor().getPosition().element,
 121             caretTo = false;
 122         if(!element) {
 123             // Chrome hack
 124             var direction;
 125             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 126                 direction = 'above';
 127                 caretTo = 'end';
 128             } else {
 129                 direction = 'below';
 130                 caretTo = 'start';
 131             }
 132             element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
 133         }
 134         canvas.setCurrentElement(element, {caretTo: caretTo});
 135     }
 136 });
 137
 138
 139 var selectsWholeTextElement = function(cursor) {
 140     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
 141         return true;
 142     return false;
 143 }
 144
 145 handlers.push({key: KEYS.X,
 146     keydown: function(event, canvas) {
 147         if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor()))
 148             event.preventDefault();
 149     }
 150 });
 151
 152 handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
 153     keydown: function(event, canvas) {
 154         var cursor = canvas.getCursor(),
 155             position = canvas.getCursor().getPosition(),
 156             element = position.element;
 157
 158         if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 159             event.preventDefault();
 160             return;
 161         }
 162
 163         var cursorAtOperationEdge = position.offsetAtBeginning;
 164         if(event.which === KEYS.DELETE) {
 165             cursorAtOperationEdge = position.offsetAtEnd;
 166         }
 167
 168         var willDeleteWholeText = function() {
 169             return element.getText().length === 1 || selectsWholeTextElement(cursor);
 170         }
 171
 172         if(willDeleteWholeText()) {
 173             event.preventDefault();
 174             element.setText('');
 175         }
 176         else if(element.isEmpty()) {
 177
 178             var direction = 'above',
 179                 caretTo = 'end';
 180
 181             if(event.which === KEYS.DELETE) {
 182                 direction = 'below';
 183                 caretTo = 'start';
 184             }
 185
 186             event.preventDefault();
 187
 188             var parent = element.parent(),
 189                 grandParent = parent ? parent.parent() : null,
 190                 goto;
 191             if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 192                 if(grandParent && grandParent.children().length === 1) {
 193                     goto = grandParent.data('wlxmlNode').append({text: ''});
 194                 } else {
 195                     goto = element.getNearestTextElement(direction);
 196                 }
 197                 parent.data('wlxmlNode').detach();
 198             } else {
 199                 goto = element.getNearestTextElement(direction);
 200                 element.data('wlxmlNode').detach();
 201             }
 202             canvas.setCurrentElement(goto, {caretTo: caretTo});
 203             canvas.publisher('contentChanged');
 204         }
 205         else if(cursorAtOperationEdge) {
 206             // todo
 207             event.preventDefault();
 208         }
 209     }
 210 });
 211
 212 return {
 213     handleKey: handleKey
 214 };
 215
 216 });