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                 var result = position.element.data('wlxmlNode').breakContent({offset: position.offset}),
  97                     goto, gotoOptions;
  98                 if(result.emptyText) {
  99                     goto = result.createdEmpty;
 100                     gotoOptions = {};
 101                 } else {
 102                     goto = result.second;
 103                     gotoOptions = {caretTo: 'start'};
 104                 }
 105
 106                 canvas.setCurrentElement(utils.findCanvasElement(goto), gotoOptions);
 107             }
 108         }
 109     }
 110 });
 111
 112 handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
 113     keydown: function(event, canvas) {
 114         var position = canvas.getCursor().getPosition(),
 115             element = position.element;
 116         if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
 117             var direction, caretTo;
 118             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 119                 direction = 'above';
 120                 caretTo = 'end';
 121             } else {
 122                 direction = 'below';
 123                 caretTo = 'start';
 124             }
 125             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 126             canvas.setCurrentElement(el, {caretTo: caretTo});
 127         }
 128     },
 129     keyup: function(event, canvas) {
 130         var element = canvas.getCursor().getPosition().element,
 131             caretTo = false;
 132         if(!element) {
 133             // Chrome hack
 134             var direction;
 135             if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
 136                 direction = 'above';
 137                 caretTo = 'end';
 138             } else {
 139                 direction = 'below';
 140                 caretTo = 'start';
 141             }
 142             element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
 143         }
 144         canvas.setCurrentElement(element, {caretTo: caretTo});
 145     }
 146 });
 147
 148
 149 var selectsWholeTextElement = function(cursor) {
 150     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
 151         return true;
 152     return false;
 153 }
 154
 155 handlers.push({key: KEYS.X,
 156     keydown: function(event, canvas) {
 157         if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor()))
 158             event.preventDefault();
 159     }
 160 });
 161
 162 handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
 163     keydown: function(event, canvas) {
 164         var cursor = canvas.getCursor(),
 165             position = canvas.getCursor().getPosition(),
 166             element = position.element;
 167
 168         if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 169             event.preventDefault();
 170             return;
 171         }
 172
 173         var cursorAtOperationEdge = position.offsetAtBeginning;
 174         if(event.which === KEYS.DELETE) {
 175             cursorAtOperationEdge = position.offsetAtEnd;
 176         }
 177
 178         var willDeleteWholeText = function() {
 179             return element.getText().length === 1 || selectsWholeTextElement(cursor);
 180         }
 181
 182         if(willDeleteWholeText()) {
 183             event.preventDefault();
 184             element.setText('');
 185         }
 186         else if(element.isEmpty()) {
 187
 188             var direction = 'above',
 189                 caretTo = 'end';
 190
 191             if(event.which === KEYS.DELETE) {
 192                 direction = 'below';
 193                 caretTo = 'start';
 194             }
 195
 196             event.preventDefault();
 197
 198             var parent = element.parent(),
 199                 grandParent = parent ? parent.parent() : null,
 200                 goto;
 201             if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 202                 if(grandParent && grandParent.children().length === 1) {
 203                     goto = grandParent.data('wlxmlNode').append({text: ''});
 204                 } else {
 205                     goto = element.getNearestTextElement(direction);
 206                 }
 207                 parent.data('wlxmlNode').detach();
 208             } else {
 209                 goto = element.getNearestTextElement(direction);
 210                 element.data('wlxmlNode').detach();
 211             }
 212             canvas.setCurrentElement(goto, {caretTo: caretTo});
 213             canvas.publisher('contentChanged');
 214         }
 215         else if(cursorAtOperationEdge) {
 216             // todo
 217             event.preventDefault();
 218         }
 219     }
 220 });
 221
 222 return {
 223     handleKey: handleKey
 224 };
 225
 226 });