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 = $('<nobr><span id="caret"><textarea></textarea></span></nobr>');
   8
   9         // When user writes into caret, add it to the document.
  10         $('textarea', caret).on('input', function() {
  11             let v = $(this).val();
  12             $(this).val('');
  13             self.insertChar(v);
  14
  15         });
  16
  17         // On click on x-node element, set caret position.
  18         self.view.on('click', '*[x-node]', function(e) {
  19             if (e.redakcja_caret_ignore) return;
  20             e.redakcja_caret_ignore = true;
  21
  22             if (self.singleClick) {
  23                 self.singleClick = false;
  24                 return;
  25             }
  26
  27             self.detach();
  28
  29             var selection = window.getSelection();
  30             if (!selection.isCollapsed) return;
  31             var anchorNode = selection.anchorNode;
  32             if (anchorNode.nodeType != Node.TEXT_NODE) return;
  33             // Is selection still inside a node?
  34             if (!$(anchorNode).closest('[x-node]').length) return;
  35             if ($(anchorNode).parents('[x-annotation-box]').not('.editing').length) return;
  36
  37             self.singleClick = true;
  38             setTimeout(function() {
  39                 if (self.singleClick) {
  40                     $.wiki.activePerspective().flush();
  41                     self.element.insertBefore(
  42                         anchorNode.splitText(
  43                             selection.anchorOffset
  44                         )
  45                     )
  46                     self.focus();
  47                 }
  48                 self.singleClick = false;
  49             }, 250);
  50
  51         });
  52
  53         self.element.on('keydown', function(e) {
  54             // TODO:
  55             // delete selection?
  56
  57             // cases:
  58             // we are in <akap> (no going up)
  59             // we are in <wyroznienie> (can go up)
  60             // we are next to <wyroznienie> (can go inside)
  61
  62             switch (e.key) {
  63             case "ArrowRight":
  64                 if (e.shiftKey) {
  65                     self.detach();
  66                     return;
  67                 }
  68
  69                 self.moveRight();
  70                 break;
  71             case "ArrowLeft":
  72                 if (e.shiftKey) {
  73                     self.detach();
  74                     return;
  75                 }
  76
  77                 self.moveLeft();
  78                 break;
  79             case "ArrowUp":
  80                 if (e.shiftKey) {
  81                     self.detach();
  82                     return;
  83                 }
  84                 break;
  85             case "ArrowDown":
  86                 if (e.shiftKey) {
  87                     self.detach();
  88                     return;
  89                 }
  90                 break;
  91             case "Backspace":
  92                 self.deleteBefore();
  93                 break;
  94             case "Delete":
  95                 self.deleteAfter();
  96                 break;
  97             case "Enter":
  98                 self.splitBlock();
  99                 break;
 100                 //                default:
 101                 //                    console.log('key', e.key, e.code);
 102             }
 103         })
 104     }
 105
 106     get attached() {
 107         return this.element.parent().length;
 108     }
 109
 110     detach() {
 111         let p;
 112         if (this.attached) {
 113             p = this.element.parent()[0]
 114             this.element.detach();
 115             p.normalize()
 116         }
 117     }
 118
 119     focus() {
 120         $("textarea", self.element).focus();
 121     }
 122
 123     normalize() {
 124         this.element.parent()[0].normalize();
 125     }
 126
 127     insert(elem) {
 128         elem.insertBefore(this.element);
 129     }
 130
 131     insertChar(ch) {
 132         this.insert(
 133             $(document.createTextNode(ch))
 134         );
 135         this.normalize();
 136     }
 137
 138     deleteBefore() {
 139         let contents = this.element.parent().contents();
 140         // Find the text before caret.
 141         let textBefore = contents[contents.index(this.element) - 1];
 142
 143         // Should be text, but what if not?
 144         textBefore.textContent = textBefore.textContent.substr(0, textBefore.textContent.length - 1);
 145         this.normalize();
 146
 147     }
 148
 149     deleteAfter() {
 150         let contents = this.element.parent().contents();
 151         // Find the text after caret.
 152         let textAfter = contents[contents.index(this.element) + 1];
 153         textAfter.textContent = textAfter.textContent.substr(1);
 154     }
 155
 156     splitBlock() {
 157         let splitter = this.element;
 158         let parent, newParent, splitIndex, index;
 159
 160         while (!splitter.is('div[x-node]')) {
 161             parent = splitter.parent();
 162             splitIndex = parent.contents().index(splitter);
 163
 164             if (parent.is('[x-annotation-box]')) {
 165                 // We're splitting inside an inline-style annotation.
 166                 // Convert into a block-style annotation now.
 167                 let p = $('<div x-editable="true" x-node="akap">');
 168                 parent.contents().appendTo(p);
 169                 parent.empty();
 170                 parent.append(p);
 171                 parent = p;
 172             }
 173
 174             newParent = parent.clone();
 175             index = parent.contents().length - 1;
 176             while (index >= splitIndex) {
 177                 newParent.contents()[index].remove();
 178                 --index;
 179             }
 180             while (index >= 0) {
 181                 parent.contents()[index].remove();
 182                 -- index;
 183             }
 184             newParent.insertBefore(parent);
 185
 186             splitter = parent;
 187         }
 188     }
 189
 190     moveLeft() {
 191         this.move({
 192             move: -1,
 193             edge: (i, l) => {return !i;},
 194             enter: (l) => {return l - 1;},
 195             splitTarget: (t) => {return t.splitText(t.length - 1);},
 196             noSplitTarget: (t) => {return t.splitText(t.length);},
 197         })
 198     }
 199
 200     moveRight() {
 201         this.move({
 202             move: 1,
 203             edge: (i, l) => {return i == l - 1;},
 204             enter: (l) => {return 0;},
 205             splitTarget: (t) => {return t.splitText(1);},
 206             noSplitTarget: (t) => {return t;},
 207         })
 208     }
 209
 210     move(opts) {
 211         if (!this.attached) return;
 212
 213         $.wiki.activePerspective().flush();
 214
 215         this.normalize();
 216
 217         let contents = this.element.parent().contents();
 218         let index = contents.index(this.element);
 219         let target, moved, oldparent;
 220
 221         let parent = this.element.parent()[0];
 222
 223         if (opts.edge(index, contents.length)) {
 224             // We're at the end -- what to do?
 225             // can we go up?
 226
 227             if (parent.nodeName == 'EM') {
 228                 oldparent = parent;
 229                 parent = parent.parentNode;
 230                 contents = $(parent).contents();
 231                 index = contents.index(oldparent);
 232             }
 233         }
 234
 235         index += opts.move;
 236         target = contents[index];
 237         moved = false;
 238
 239         while (target !== undefined && target.nodeType == Node.ELEMENT_NODE) {
 240             // we've encountered a node.
 241             // can we go inside?
 242
 243             if (target.nodeName == 'EM') {
 244                 // enter
 245                 parent = $(target);
 246                 contents = parent.contents();
 247                 index = opts.enter(contents.length);
 248                 target = contents[index];
 249
 250                 // what if it has no elements?
 251             } else {
 252                 // skip
 253                 index += opts.move; // again, what if end?
 254                 target = contents[index];
 255                 moved = true;
 256             }
 257
 258             // if editable?
 259             // what if editable but empty?
 260
 261         }
 262
 263         if (target !== undefined && target.nodeType == Node.TEXT_NODE ) {
 264             if (!moved) {
 265                 target = opts.splitTarget(target);
 266             } else {
 267                 target = opts.noSplitTarget(target);
 268             }
 269
 270             this.element.insertBefore(target);
 271         }
 272         this.normalize();
 273         this.focus();
 274     }
 275 }