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                     newEmpty,
  79                     goto,
  80                     gotoOptions;
  81
  82                 if(position.offsetAtBeginning)
  83                     newEmpty = nodes.first;
  84                 else if(position.offsetAtEnd)
  85                     newEmpty = nodes.second;
  86
  87                 if(newEmpty) {
  88                     goto = newEmpty.append({text: ''});
  89                     gotoOptions = {};
  90                 } else {
  91                     goto = nodes.second;
  92                     gotoOptions = {caretTo: 'start'};
  93                 }
  94
  95                 canvas.setCurrentElement(utils.findCanvasElement(goto), gotoOptions);
  96             }
  97         }
  98     }
  99 });
 100
 101 handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
 102     keydown: function(event, canvas) {
 103         var position = canvas.getCursor().getPosition(),
 104             element = position.element;
 105         if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
 106             var direction, caretTo;
 107             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 108                 direction = 'above';
 109                 caretTo = 'end';
 110             } else {
 111                 direction = 'below';
 112                 caretTo = 'start';
 113             }
 114             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 115             canvas.setCurrentElement(el, {caretTo: caretTo});
 116         }
 117     },
 118     keyup: function(event, canvas) {
 119         var element = canvas.getCursor().getPosition().element,
 120             caretTo = false;
 121         if(!element) {
 122             // Chrome hack
 123             var direction;
 124             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 125                 direction = 'above';
 126                 caretTo = 'end';
 127             } else {
 128                 direction = 'below';
 129                 caretTo = 'start';
 130             }
 131             element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
 132         }
 133         canvas.setCurrentElement(element, {caretTo: caretTo});
 134     }
 135 });
 136
 137
 138 var selectsWholeTextElement = function(cursor) {
 139     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
 140         return true;
 141     return false;
 142 }
 143
 144 handlers.push({key: KEYS.X,
 145     keydown: function(event, canvas) {
 146         if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor()))
 147             event.preventDefault();
 148     }
 149 });
 150
 151 handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
 152     keydown: function(event, canvas) {
 153         var cursor = canvas.getCursor(),
 154             position = canvas.getCursor().getPosition(),
 155             element = position.element;
 156
 157         if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 158             event.preventDefault();
 159             return;
 160         }
 161
 162         var cursorAtOperationEdge = position.offsetAtBeginning;
 163         if(event.which === KEYS.DELETE) {
 164             cursorAtOperationEdge = position.offsetAtEnd;
 165         }
 166
 167         var willDeleteWholeText = function() {
 168             return element.getText().length === 1 || selectsWholeTextElement(cursor);
 169         }
 170
 171         if(willDeleteWholeText()) {
 172             event.preventDefault();
 173             element.setText('');
 174         }
 175         else if(element.isEmpty()) {
 176
 177             var direction = 'above',
 178                 caretTo = 'end';
 179
 180             if(event.which === KEYS.DELETE) {
 181                 direction = 'below';
 182                 caretTo = 'start';
 183             }
 184
 185             event.preventDefault();
 186
 187             var parent = element.parent(),
 188                 grandParent = parent ? parent.parent() : null,
 189                 goto;
 190             if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 191                 if(grandParent && grandParent.children().length === 1) {
 192                     goto = grandParent.append({text: ''});
 193                 } else {
 194                     goto = element.getNearestTextElement(direction);
 195                 }
 196                 parent.detach();
 197             } else {
 198                 goto = element.getNearestTextElement(direction);
 199                 element.detach();
 200             }
 201             canvas.setCurrentElement(goto, {caretTo: caretTo});
 202             canvas.publisher('contentChanged');
 203         }
 204         else if(cursorAtOperationEdge) {
 205             // todo
 206             event.preventDefault();
 207         }
 208     }
 209 });
 210
 211 return {
 212     handleKey: handleKey
 213 };
 214
 215 });