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
 159             if (parent.is('[x-annotation-box]')) {
 160                 // We're splitting inside an inline-style annotation.
 161                 // Convert into a block-style annotation now.
 162                 let p = $('<div x-editable="true" x-node="akap">');
 163                 parent.contents().appendTo(p);
 164                 parent.empty();
 165                 parent.append(p);
 166                 parent = p;
 167             }
 168
 169             newParent = parent.clone();
 170             index = parent.contents().length - 1;
 171             while (index >= splitIndex) {
 172                 newParent.contents()[index].remove();
 173                 --index;
 174             }
 175             while (index >= 0) {
 176                 console.log(newParent, index);
 177                 parent.contents()[index].remove();
 178                 -- index;
 179             }
 180             newParent.insertBefore(parent);
 181
 182             console.log('split', parent);
 183             splitter = parent;
 184         }
 185     }
 186
 187     moveLeft() {
 188         this.move({
 189             move: -1,
 190             edge: (i, l) => {return !i;},
 191             enter: (l) => {return l - 1;},
 192             splitTarget: (t) => {return t.splitText(t.length - 1);},
 193             noSplitTarget: (t) => {return t.splitText(t.length);},
 194         })
 195     }
 196
 197     moveRight() {
 198         this.move({
 199             move: 1,
 200             edge: (i, l) => {return i == l - 1;},
 201             enter: (l) => {return 0;},
 202             splitTarget: (t) => {return t.splitText(1);},
 203             noSplitTarget: (t) => {return t;},
 204         })
 205     }
 206
 207     move(opts) {
 208         if (!this.attached) return;
 209
 210         this.normalize();
 211
 212         let contents = this.element.parent().contents();
 213         let index = contents.index(this.element);
 214         let target, moved, oldparent;
 215
 216         let parent = this.element.parent()[0];
 217
 218         if (opts.edge(index, contents.length)) {
 219             // We're at the end -- what to do?
 220             // can we go up?
 221
 222             if (parent.nodeName == 'EM') {
 223                 oldparent = parent;
 224                 parent = parent.parentNode;
 225                 contents = $(parent).contents();
 226                 index = contents.index(oldparent);
 227             }
 228         }
 229
 230         index += opts.move;
 231         target = contents[index];
 232         moved = false;
 233
 234         while (target.nodeType == 1) {
 235             // we've encountered a node.
 236             // can we go inside?
 237
 238             if (target.nodeName == 'EM') {
 239                 // enter
 240                 parent = $(target);
 241                 contents = parent.contents();
 242                 index = opts.enter(contents.length);
 243                 target = contents[index];
 244
 245                 // what if it has no elements?
 246             } else {
 247                 // skip
 248                 index += opts.move; // again, what if end?
 249                 target = contents[index];
 250                 moved = true;
 251             }
 252
 253             // if editable?
 254             // what if editable but empty?
 255
 256         }
 257
 258         if (target.nodeType == 3) {
 259             if (!moved) {
 260                 target = opts.splitTarget(target);
 261             } else {
 262                 target = opts.noSplitTarget(target);
 263             }
 264
 265             this.element.insertBefore(target);
 266         }
 267         this.normalize();
 268         this.focus();
 269     }
 270 }