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.after({tag: currentElement.getWlxmlTag() || 'div', klass: currentElement.getWlxmlClass() || 'p'});
  51                 added.append({text:''});
  52                 canvas.setCurrentElement(added, {caretTo: 'start'});
  53             }
  54             return;
  55         }
  56
  57         if(!cursor.isSelecting()) {
  58             if(event.ctrlKey) {
  59                 var added = element.after({tag: element.getWlxmlTag() || 'div', klass: element.getWlxmlClass() || 'p'});
  60                 added.append({text:''});
  61                 canvas.setCurrentElement(added, {caretTo: 'start'});
  62
  63             } else {
  64
  65                 if(!(element.parent().parent())) {
  66                     return false; // top level element is unsplittable
  67                 }
  68
  69                 var elements = position.element.split({offset: position.offset}),
  70                     newEmpty,
  71                     goto,
  72                     gotoOptions;
  73
  74                 if(position.offsetAtBeginning)
  75                     newEmpty = elements.first;
  76                 else if(position.offsetAtEnd)
  77                     newEmpty = elements.second;
  78
  79                 if(newEmpty) {
  80                     goto = newEmpty.append(documentElement.DocumentTextElement.create({text: ''}, this));
  81                     gotoOptions = {};
  82                 } else {
  83                     goto = elements.second;
  84                     gotoOptions = {caretTo: 'start'};
  85                 }
  86
  87                 canvas.setCurrentElement(goto, gotoOptions);
  88             }
  89         }
  90     }
  91 });
  92
  93 handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
  94     keydown: function(event, canvas) {
  95         var position = canvas.getCursor().getPosition(),
  96             element = position.element;
  97         if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
  98             var direction, caretTo;
  99             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 100                 direction = 'above';
 101                 caretTo = 'end';
 102             } else {
 103                 direction = 'below';
 104                 caretTo = 'start';
 105             }
 106             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 107             canvas.setCurrentElement(el, {caretTo: caretTo});
 108         }
 109     },
 110     keyup: function(event, canvas) {
 111         var element = canvas.getCursor().getPosition().element,
 112             caretTo = false;
 113         if(!element) {
 114             // Chrome hack
 115             var direction;
 116             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 117                 direction = 'above';
 118                 caretTo = 'end';
 119             } else {
 120                 direction = 'below';
 121                 caretTo = 'start';
 122             }
 123             element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
 124         }
 125         canvas.setCurrentElement(element, {caretTo: caretTo});
 126     }
 127 });
 128
 129
 130 var selectsWholeTextElement = function(cursor) {
 131     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
 132         return true;
 133     return false;
 134 }
 135
 136 handlers.push({key: KEYS.X,
 137     keydown: function(event, canvas) {
 138         if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor()))
 139             event.preventDefault();
 140     }
 141 });
 142
 143 handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
 144     keydown: function(event, canvas) {
 145         var cursor = canvas.getCursor(),
 146             position = canvas.getCursor().getPosition(),
 147             element = position.element;
 148
 149         if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 150             event.preventDefault();
 151             return;
 152         }
 153
 154         var cursorAtOperationEdge = position.offsetAtBeginning;
 155         if(event.which === KEYS.DELETE) {
 156             cursorAtOperationEdge = position.offsetAtEnd;
 157         }
 158
 159         var willDeleteWholeText = function() {
 160             return element.getText().length === 1 || selectsWholeTextElement(cursor);
 161         }
 162
 163         if(willDeleteWholeText()) {
 164             event.preventDefault();
 165             element.setText('');
 166         }
 167         else if(element.isEmpty()) {
 168
 169             var direction = 'above',
 170                 caretTo = 'end';
 171
 172             if(event.which === KEYS.DELETE) {
 173                 direction = 'below';
 174                 caretTo = 'start';
 175             }
 176
 177             event.preventDefault();
 178
 179             var parent = element.parent(),
 180                 grandParent = parent ? parent.parent() : null,
 181                 goto;
 182             if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 183                 if(grandParent && grandParent.children().length === 1) {
 184                     goto = grandParent.append({text: ''});
 185                 } else {
 186                     goto = element.getNearestTextElement(direction);
 187                 }
 188                 parent.detach();
 189             } else {
 190                 goto = element.getNearestTextElement(direction);
 191                 element.detach();
 192             }
 193             canvas.setCurrentElement(goto, {caretTo: caretTo});
 194             canvas.publisher('contentChanged');
 195         }
 196         else if(cursorAtOperationEdge) {
 197             // todo
 198             event.preventDefault();
 199         }
 200     }
 201 });
 202
 203 return {
 204     handleKey: handleKey
 205 };
 206
 207 });