src/redakcja/static/js/wiki/caret.js

   1 class Caret {
   2     constructor(view) {
   3         let self = this;
   4         self.view = view;
   5         self.singleClick = false;
   6
   7         let caret = this.element = $('<span id="caret"><textarea></textarea></span>');
   8
   9         // When user writes into caret, add it to the document.
  10         $('textarea', caret).on('input', function() {
  11             let v = $(this).val();
  12             $(this).val('');
  13             self.insertChar(v);
  14
  15         });
  16
  17         // On click on x-node element, set caret position.
  18         self.view.on('click', '*[x-node]', function(e) {
  19             if (e.redakcja_caret_inserted) return;
  20             e.redakcja_caret_inserted = true;
  21
  22             if (self.singleClick) {
  23                 self.singleClick = false;
  24                 return;
  25             }
  26
  27             self.detach();
  28
  29             var selection = window.getSelection();
  30             if (!selection.isCollapsed) return;
  31             var anchorNode = selection.anchorNode;
  32             // Is selection still inside a node?
  33             if (!$(anchorNode).closest('[x-node]').length) return;
  34
  35             self.singleClick = true;
  36             setTimeout(function() {
  37                 if (self.singleClick) {
  38                     self.element.insertBefore(
  39                         anchorNode.splitText(
  40                             selection.anchorOffset
  41                         )
  42                     )
  43                     self.focus();
  44                 }
  45                 self.singleClick = false;
  46             }, 250);
  47
  48         });
  49
  50         self.element.on('keydown', function(e) {
  51             console.log('KEY');
  52
  53             // TODO:
  54             // delete selection?
  55
  56             // cases:
  57             // we are in <akap> (no going up)
  58             // we are in <wyroznienie> (can go up)
  59             // we are next to <wyroznienie> (can go inside)
  60
  61             switch (e.key) {
  62             case "ArrowRight":
  63                 if (e.shiftKey) {
  64                     self.detach();
  65                     return;
  66                 }
  67
  68                 self.moveRight();
  69                 break;
  70             case "ArrowLeft":
  71                 if (e.shiftKey) {
  72                     self.detach();
  73                     return;
  74                 }
  75
  76                 self.moveLeft();
  77                 break;
  78             case "ArrowUp":
  79                 if (e.shiftKey) {
  80                     self.detach();
  81                     return;
  82                 }
  83                 break;
  84             case "ArrowDown":
  85                 if (e.shiftKey) {
  86                     self.detach();
  87                     return;
  88                 }
  89                 break;
  90             case "Backspace":
  91                 self.deleteBefore();
  92                 break;
  93             case "Delete":
  94                 self.deleteAfter();
  95                 break;
  96             case "Enter":
  97                 self.splitBlock();
  98                 break;
  99                 //                default:
 100                 //                    console.log('key', e.key, e.code);
 101             }
 102         })
 103     }
 104
 105     get attached() {
 106         return this.element.parent().length;
 107     }
 108
 109     detach() {
 110         console.log(this.view);
 111
 112         let p;
 113         if (this.attached) {
 114             p = this.element.parent()[0]
 115             this.element.detach();
 116             p.normalize()
 117         }
 118     }
 119
 120     focus() {
 121         $("textarea", self.element).focus();
 122     }
 123
 124     normalize() {
 125         this.element.parent()[0].normalize();
 126     }
 127
 128     insertChar(ch) {
 129         $(document.createTextNode(ch)).insertBefore(this.element);
 130         this.normalize();
 131     }
 132
 133     deleteBefore() {
 134         let contents = this.element.parent().contents();
 135         // Find the text before caret.
 136         let textBefore = contents[contents.index(this.element) - 1];
 137
 138         // Should be text, but what if not?
 139         textBefore.textContent = textBefore.textContent.substr(0, textBefore.textContent.length - 1);
 140         this.normalize();
 141
 142     }
 143
 144     deleteAfter() {
 145         let contents = this.element.parent().contents();
 146         // Find the text after caret.
 147         let textAfter = contents[contents.index(this.element) + 1];
 148         textAfter.textContent = textAfter.textContent.substr(1);
 149     }
 150
 151     splitBlock() {
 152         let splitter = this.element;
 153         let parent, newParent, splitIndex, index;
 154
 155         while (!splitter.is('div[x-node]')) {
 156             parent = splitter.parent();
 157             splitIndex = parent.contents().index(splitter);
 158             newParent = parent.clone();
 159             index = parent.contents().length - 1;
 160             while (index >= splitIndex) {
 161                 newParent.contents()[index].remove();
 162                 --index;
 163             }
 164             while (index >= 0) {
 165                 console.log(newParent, index);
 166                 parent.contents()[index].remove();
 167                 -- index;
 168             }
 169             newParent.insertBefore(parent);
 170
 171             console.log('split', parent);
 172             splitter = parent;
 173         }
 174     }
 175
 176     moveLeft() {
 177         this.move({
 178             move: -1,
 179             edge: (i, l) => {return !i;},
 180             enter: (l) => {return l - 1;},
 181             splitTarget: (t) => {return t.splitText(t.length - 1);},
 182             noSplitTarget: (t) => {return t.splitText(t.length);},
 183         })
 184     }
 185
 186     moveRight() {
 187         this.move({
 188             move: 1,
 189             edge: (i, l) => {return i == l - 1;},
 190             enter: (l) => {return 0;},
 191             splitTarget: (t) => {return t.splitText(1);},
 192             noSplitTarget: (t) => {return t;},
 193         })
 194     }
 195
 196     move(opts) {
 197         if (!this.attached) return;
 198
 199         this.normalize();
 200
 201         let contents = this.element.parent().contents();
 202         let index = contents.index(this.element);
 203         let target, moved, oldparent;
 204
 205         let parent = this.element.parent()[0];
 206
 207         if (opts.edge(index, contents.length)) {
 208             // We're at the end -- what to do?
 209             // can we go up?
 210
 211             if (parent.nodeName == 'EM') {
 212                 oldparent = parent;
 213                 parent = parent.parentNode;
 214                 contents = $(parent).contents();
 215                 index = contents.index(oldparent);
 216             }
 217         }
 218
 219         index += opts.move;
 220         target = contents[index];
 221         moved = false;
 222
 223         while (target.nodeType == 1) {
 224             // we've encountered a node.
 225             // can we go inside?
 226
 227             if (target.nodeName == 'EM') {
 228                 // enter
 229                 parent = $(target);
 230                 contents = parent.contents();
 231                 index = opts.enter(contents.length);
 232                 target = contents[index];
 233
 234                 // what if it has no elements?
 235             } else {
 236                 // skip
 237                 index += opts.move; // again, what if end?
 238                 target = contents[index];
 239                 moved = true;
 240             }
 241
 242             // if editable?
 243             // what if editable but empty?
 244
 245         }
 246
 247         if (target.nodeType == 3) {
 248             if (!moved) {
 249                 target = opts.splitTarget(target);
 250             } else {
 251                 target = opts.noSplitTarget(target);
 252             }
 253
 254             this.element.insertBefore(target);
 255         }
 256         this.normalize();
 257         this.focus();
 258     }
 259 }