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