fix
[redakcja.git] / 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             $(this).val('');
13             self.insertChar(v);
14
15         });
16
17         // On click on x-node element, set caret position.
18         self.view.on('click', '*[x-node]', function(e) {
19             if (e.redakcja_caret_ignore) return;
20             e.redakcja_caret_ignore = true;
21
22             if (self.singleClick) {
23                 self.singleClick = false;
24                 return;
25             }
26
27             self.detach();
28
29             var selection = window.getSelection();
30             if (!selection.isCollapsed) return;
31             var anchorNode = selection.anchorNode;
32             if (anchorNode.nodeType != Node.TEXT_NODE) return;
33             // This selection is not from this click. Ignore it.
34             if (anchorNode.parentNode != e.target) return;
35             // Is selection still inside a node?
36             if (!$(anchorNode).closest('[x-node]').length) return;
37             if ($(anchorNode).parents('[x-annotation-box]').not('.editing').length) return;
38
39             self.singleClick = true;
40             setTimeout(function() {
41                 if (self.singleClick) {
42                     $.wiki.activePerspective().flush();
43                     self.element.insertBefore(
44                         anchorNode.splitText(
45                             selection.anchorOffset
46                         )
47                     )
48                     self.focus();
49                 }
50                 self.singleClick = false;
51             }, 250);
52
53         });
54
55         self.element.on('keydown', function(e) {
56             // TODO:
57             // delete selection?
58
59             // cases:
60             // we are in <akap> (no going up)
61             // we are in <wyroznienie> (can go up)
62             // we are next to <wyroznienie> (can go inside)
63
64             switch (e.key) {
65             case "ArrowRight":
66                 if (e.shiftKey) {
67                     self.detach();
68                     return;
69                 }
70
71                 self.moveRight();
72                 break;
73             case "ArrowLeft":
74                 if (e.shiftKey) {
75                     self.detach();
76                     return;
77                 }
78
79                 self.moveLeft();
80                 break;
81             case "ArrowUp":
82                 if (e.shiftKey) {
83                     self.detach();
84                     return;
85                 }
86                 break;
87             case "ArrowDown":
88                 if (e.shiftKey) {
89                     self.detach();
90                     return;
91                 }
92                 break;
93             case "Backspace":
94                 self.deleteBefore();
95                 break;
96             case "Delete":
97                 self.deleteAfter();
98                 break;
99             case "Enter":
100                 self.splitBlock();
101                 break;
102                 //                default:
103                 //                    console.log('key', e.key, e.code);
104             }
105         })
106     }
107
108     get attached() {
109         return this.element.parent().length;
110     }
111
112     detach() {
113         let p;
114         if (this.attached) {
115             p = this.element.parent()[0]
116             this.element.detach();
117             p.normalize()
118         }
119     }
120
121     focus() {
122         $("textarea", self.element).focus();
123     }
124
125     normalize() {
126         this.element.parent()[0].normalize();
127     }
128
129     insert(elem) {
130         elem.insertBefore(this.element);
131     }
132
133     insertChar(ch) {
134         this.insert(
135             $(document.createTextNode(ch))
136         );
137         this.normalize();
138     }
139
140     deleteBefore() {
141         let contents = this.element.parent().contents();
142         // Find the text before caret.
143         let textBefore = contents[contents.index(this.element) - 1];
144
145         // Should be text, but what if not?
146         textBefore.textContent = textBefore.textContent.substr(0, textBefore.textContent.length - 1);
147         this.normalize();
148
149     }
150
151     deleteAfter() {
152         let contents = this.element.parent().contents();
153         // Find the text after caret.
154         let textAfter = contents[contents.index(this.element) + 1];
155         textAfter.textContent = textAfter.textContent.substr(1);
156     }
157
158     splitBlock() {
159         let splitter = this.element;
160         let parent, newParent, splitIndex, index;
161
162         while (!splitter.is('div[x-node]')) {
163             parent = splitter.parent();
164             splitIndex = parent.contents().index(splitter);
165
166             if (parent.is('[x-annotation-box]')) {
167                 // We're splitting inside an inline-style annotation.
168                 // Convert into a block-style annotation now.
169                 let p = $('<div x-editable="true" x-node="akap">');
170                 parent.contents().appendTo(p);
171                 parent.empty();
172                 parent.append(p);
173                 parent = p;
174             }
175
176             newParent = parent.clone();
177             index = parent.contents().length - 1;
178             while (index >= splitIndex) {
179                 newParent.contents()[index].remove();
180                 --index;
181             }
182             while (index >= 0) {
183                 parent.contents()[index].remove();
184                 -- index;
185             }
186             newParent.insertBefore(parent);
187
188             splitter = parent;
189         }
190     }
191
192     moveLeft() {
193         this.move({
194             move: -1,
195             edge: (i, l) => {return !i;},
196             enter: (l) => {return l - 1;},
197             splitTarget: (t) => {return t.splitText(t.length - 1);},
198             noSplitTarget: (t) => {return t.splitText(t.length);},
199         })
200     }
201
202     moveRight() {
203         this.move({
204             move: 1,
205             edge: (i, l) => {return i == l - 1;},
206             enter: (l) => {return 0;},
207             splitTarget: (t) => {return t.splitText(1);},
208             noSplitTarget: (t) => {return t;},
209         })
210     }
211
212     move(opts) {
213         if (!this.attached) return;
214
215         $.wiki.activePerspective().flush();
216
217         this.normalize();
218
219         let contents = this.element.parent().contents();
220         let index = contents.index(this.element);
221         let target, moved, oldparent;
222
223         let parent = this.element.parent()[0];
224
225         if (opts.edge(index, contents.length)) {
226             // We're at the end -- what to do?
227             // can we go up?
228
229             if (parent.nodeName == 'EM') {
230                 oldparent = parent;
231                 parent = parent.parentNode;
232                 contents = $(parent).contents();
233                 index = contents.index(oldparent);
234             }
235         }
236
237         index += opts.move;
238         target = contents[index];
239         moved = false;
240
241         while (target !== undefined && target.nodeType == Node.ELEMENT_NODE) {
242             // we've encountered a node.
243             // can we go inside?
244
245             if (target.nodeName == 'EM') {
246                 // enter
247                 parent = $(target);
248                 contents = parent.contents();
249                 index = opts.enter(contents.length);
250                 target = contents[index];
251
252                 // what if it has no elements?
253             } else {
254                 // skip
255                 index += opts.move; // again, what if end?
256                 target = contents[index];
257                 moved = true;
258             }
259
260             // if editable?
261             // what if editable but empty?
262
263         }
264
265         if (target !== undefined && target.nodeType == Node.TEXT_NODE ) {
266             if (!moved) {
267                 target = opts.splitTarget(target);
268             } else {
269                 target = opts.noSplitTarget(target);
270             }
271
272             this.element.insertBefore(target);
273         }
274         this.normalize();
275         this.focus();
276     }
277 }