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     }
  33     if(handler.keys && handler.keys.indexOf(event.which) !== -1) {
  34         return true;
  35     }
  36     return false;
  37 };
  38
  39 var handlers = [];
  40
  41
  42 handlers.push({key: KEYS.ENTER,
  43     keydown: function(event, canvas) {
  44         event.preventDefault();
  45         var cursor = canvas.getCursor(),
  46             position = cursor.getPosition(),
  47             element = position.element,
  48             added;
  49
  50         if(Object.keys(cursor.getPosition()).length === 0) {
  51             var currentElement = canvas.getCurrentNodeElement();
  52             if(currentElement) {
  53                 canvas.wlxmlDocument.startTransaction();
  54                 added = currentElement.wlxmlNode.after({
  55                     tagName: currentElement.getWlxmlTag() || 'div',
  56                     attrs: {'class': currentElement.getWlxmlClass() || 'p'}
  57                 });
  58                 added.append({text:''});
  59                 canvas.wlxmlDocument.endTransaction();
  60                 canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
  61             }
  62             return;
  63         }
  64
  65         if(!cursor.isSelecting()) {
  66             if(event.ctrlKey) {
  67                 if(element instanceof documentElement.DocumentTextElement) {
  68                     element = element.parent();
  69                 }
  70
  71                 canvas.wlxmlDocument.startTransaction();
  72                 added = element.wlxmlNode.after(
  73                     {tagName: element.getWlxmlTag() || 'div', attrs: {'class': element.getWlxmlClass() || 'p'}}
  74                 );
  75                 added.append({text: ''});
  76                 canvas.wlxmlDocument.endTransaction();
  77                 canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
  78
  79             } else {
  80
  81                 if(!(element.parent().parent())) {
  82                     return false; // top level element is unsplittable
  83                 }
  84
  85                 //var nodes = position.element.data('wlxmlNode').split({offset: position.offset}),
  86                 // var nodes = position.element.data('wlxmlNode').transform('split', {offset: position.offset}),
  87                 //     newEmpty,
  88                 //     goto,
  89                 //     gotoOptions;
  90
  91                 // if(position.offsetAtBeginning)
  92                 //     newEmpty = nodes.first;
  93                 // else if(position.offsetAtEnd)
  94                 //     newEmpty = nodes.second;
  95
  96                 // if(newEmpty) {
  97                 //     //goto = newEmpty.append({text: ''});
  98                 //     gotoOptions = {};
  99                 // } else {
 100                 //     goto = nodes.second;
 101                 //     gotoOptions = {caretTo: 'start'};
 102                 // }
 103
 104                 var result = position.element.wlxmlNode.breakContent({offset: position.offset}),
 105                     goto, gotoOptions;
 106                 if(result.emptyText) {
 107                     goto = result.emptyText;
 108                     gotoOptions = {};
 109                 } else {
 110                     goto = result.second;
 111                     gotoOptions = {caretTo: 'start'};
 112                 }
 113
 114                 canvas.setCurrentElement(utils.findCanvasElement(goto), gotoOptions);
 115             }
 116         }
 117     }
 118 });
 119
 120 handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
 121     keydown: function(event, canvas) {
 122         var position = canvas.getCursor().getPosition(),
 123             element = position.element;
 124         if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
 125             var direction, caretTo;
 126             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 127                 direction = 'above';
 128                 caretTo = 'end';
 129             } else {
 130                 direction = 'below';
 131                 caretTo = 'start';
 132             }
 133             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 134             if(el) {
 135                 canvas.setCurrentElement(el, {caretTo: caretTo});
 136             }
 137         }
 138     },
 139     keyup: function(event, canvas) {
 140         var element = canvas.getCursor().getPosition().element,
 141             caretTo = false;
 142         if(!element) {
 143             // Chrome hack
 144
 145             var moves = [{direction: 'above', caretTo: 'end'}, {direction: 'below', caretTo: 'start'}];
 146             if(event.which === KEYS.ARROW_RIGHT  || event.which === KEYS.ARROW_DOWN) {
 147                 moves.reverse();
 148             }
 149             moves.some(function(move) {
 150                 /* globals window */
 151                 var targetNode = utils.nearestInDocumentOrder('[document-text-element]:visible', move.direction, window.getSelection().focusNode);
 152                 if(targetNode) {
 153                     element = canvas.getDocumentElement(targetNode);
 154                     caretTo = move.caretTo;
 155                     return true; // break
 156                 }
 157             });
 158         }
 159         if(element) {
 160             canvas.setCurrentElement(element, {caretTo: caretTo});
 161         }
 162     }
 163 });
 164
 165
 166 var selectsWholeTextElement = function(cursor) {
 167     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd) {
 168         return true;
 169     }
 170     return false;
 171 };
 172
 173 handlers.push({key: KEYS.X,
 174     keydown: function(event, canvas) {
 175         if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor())) {
 176             event.preventDefault();
 177         }
 178     }
 179 });
 180
 181 handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
 182     keydown: function(event, canvas) {
 183         var cursor = canvas.getCursor(),
 184             position = canvas.getCursor().getPosition(),
 185             element = position.element,
 186             node = element ? element.wlxmlNode : null,
 187             direction = 'above',
 188             caretTo = 'end',
 189             goto;
 190
 191         if(!element || !node) {
 192             return;
 193         }
 194
 195         if(event.which === KEYS.DELETE) {
 196             direction = 'below';
 197             caretTo = 'start';
 198         }
 199
 200         if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 201             event.preventDefault();
 202             var start = cursor.getSelectionStart(),
 203                 end = cursor.getSelectionEnd();
 204
 205             if(direction === 'above') {
 206                 if(start.offsetAtBeginning) {
 207                     goto = start.element.getNearestTextElement('above');
 208                     caretTo = 'end';
 209                 } else {
 210                     goto = start.element;
 211                     caretTo = start.offset;
 212                 }
 213             } else {
 214                 if(end.offsetAtEnd) {
 215                     goto = start.element.getNearestTextElement('below');
 216                     caretTo = 'start';
 217                 } else {
 218                     goto = end.element;
 219                     caretTo = 0;
 220                 }
 221             }
 222
 223             canvas.wlxmlDocument.deleteText({
 224                 from: {
 225                     node: start.element.wlxmlNode,
 226                     offset: start.offset
 227                 },
 228                 to: {
 229                     node: end.element.wlxmlNode,
 230                     offset: end.offset
 231                 }
 232             });
 233             if(goto) {
 234                 canvas.setCurrentElement(goto, {caretTo: caretTo});
 235             }
 236             return;
 237         }
 238
 239         var cursorAtOperationEdge = position.offsetAtBeginning;
 240         if(event.which === KEYS.DELETE) {
 241             cursorAtOperationEdge = position.offsetAtEnd;
 242         }
 243
 244         var willDeleteWholeText = function() {
 245             return element.getText().length === 1 || selectsWholeTextElement(cursor);
 246         };
 247
 248         canvas.wlxmlDocument.transaction(function() {
 249             if(willDeleteWholeText()) {
 250                 event.preventDefault();
 251                 node.setText('');
 252             }
 253             else if(element.isEmpty()) {
 254                 event.preventDefault();
 255                 var parent = element.parent(),
 256                     grandParent = parent ? parent.parent() : null;
 257                 if(!grandParent && parent.children().length === 1) {
 258                     return;
 259                 }
 260                 if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 261                     if(grandParent && grandParent.children().length === 1) {
 262                         goto = grandParent.wlxmlNode.append({text: ''});
 263                     } else {
 264                         goto = element.getNearestTextElement(direction);
 265                     }
 266                     parent.wlxmlNode.detach();
 267                 } else {
 268                     goto = element.getNearestTextElement(direction);
 269                     element.wlxmlNode.detach();
 270                 }
 271                 canvas.setCurrentElement(goto, {caretTo: caretTo});
 272             }
 273             else if(cursorAtOperationEdge) {
 274                 if(direction === 'below') {
 275                     element = element.getNearestTextElement(direction);
 276                 }
 277                 if(element) {
 278                     goto = element.wlxmlNode.mergeContentUp();
 279                     canvas.setCurrentElement(goto.node, {caretTo: goto.offset});
 280                 }
 281                 event.preventDefault();
 282             }
 283         });
 284     }
 285 });
 286
 287 return {
 288     handleKey: handleKey
 289 };
 290
 291 });