-
Notifications
You must be signed in to change notification settings - Fork 0
/
CommandManager.js
359 lines (293 loc) · 9.41 KB
/
CommandManager.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
import { get } from "lodash-es";
import { dia, mvc, util } from '@joint/core';
import DiffMatchPatch from "diff-match-patch";
import * as jsondiffpatch from "jsondiffpatch";
import { Logger } from "@src/core/Logger";
import { Runtime } from "@src/core/Runtime";
export class CommandManager {
constructor(options) {
this.cm = new mvc.Model();
this.logger = new Logger();
this.runtime = new Runtime();
this.graph = options.graph;
this.stackLimit = options.stackLimit;
this.differ = jsondiffpatch.create({
arrays: {
detectMove: true,
includeValueOnMove: false,
},
textDiff: {
diffMatchPatch: DiffMatchPatch,
minLength: 100,
},
cloneDiffValues: true,
});
this.reset();
this.listen();
}
listen() {
this.cm.listenTo(this.graph, 'all', this.addCommand.bind(this));
this.cm.listenTo(this.graph, 'batch:start', this.initBatchCommand.bind(this));
this.cm.listenTo(this.graph, 'batch:stop', this.storeBatchCommand.bind(this));
this.cm.listenTo(this.graph, 'reset', this.reset.bind(this));
}
on(event, fn) {
this.cm.on(event, fn);
}
createCommand(options) {
return {
action: undefined,
data: {
id: undefined,
type: undefined,
diff: {},
},
batch: !!options?.batch,
};
}
push(cmd) {
this.redoStack = [];
if(cmd.batch) {
this._pushBatch(this.batchCommand, cmd);
this.cm.trigger('batch', cmd);
} else {
this._push(this.undoStack, cmd);
this.cm.trigger("stack:push");
}
}
_pushBatch(stack, cmd) {
// This might look ugly, but it's the only way to keep the batchCommand
// stack from growing WHILE we're pushing commands. This method will keep
// the stack size under control.
if(!stack.length) {
stack.push(cmd);
return;
}
const prevCmd = stack.find(c => c.data.id === cmd.data.id && c.action === cmd.action);
// If there is no previous command there is nothing we can squash against
if(prevCmd === undefined) {
stack.push(cmd);
return;
}
// Squash "change:position" commands of the same node
if(cmd.action === "change:position") {
if("x" in cmd.data.diff.position) {
prevCmd.data.diff.position.x ??= cmd.data.diff.position.x;
prevCmd.data.diff.position.x[1] = cmd.data.diff.position.x[1];
}
if("y" in cmd.data.diff.position) {
prevCmd.data.diff.position.y ??= cmd.data.diff.position.y;
prevCmd.data.diff.position.y[1] = cmd.data.diff.position.y[1];
}
return;
}
// Squash "change:target" commands of the same link
if(cmd.action === "change:target") {
// Don't squash the command if the diff contains "magnet" and "port"
if("magnet" in cmd.data.diff.target && "port" in cmd.data.diff.target) {
stack.push(cmd);
return;
}
if("x" in cmd.data.diff.target) {
prevCmd.data.diff.target.x ??= cmd.data.diff.target.x;
prevCmd.data.diff.target.x[1] = cmd.data.diff.target.x[1];
}
if("y" in cmd.data.diff.target) {
prevCmd.data.diff.target.y ??= cmd.data.diff.target.y;
prevCmd.data.diff.target.y[1] = cmd.data.diff.target.y[1];
}
return;
}
stack.push(cmd);
}
_push(stack, cmd) {
stack.push(cmd);
if(stack.length > this.stackLimit) {
stack.splice(0, stack.length - this.stackLimit);
}
}
addCommand(cmdName, cell, _graph, options = {}) {
// Do not account for changes in `dry` run.
if (options.dry) return;
if(!/^(?:add|remove|change:\w+)$/.test(cmdName)) return;
// Do not store the op if the callee explicitly asked us not to save it
if(options?.skip_undo_stack === true) return;
// change:zoom - When the canvas is being zoomed in/out
// change:x||y - When the scroller is being moved by the user
if(["change:zoom", "change:x", "change:y"].includes(cmdName)) return;
let command = undefined;
if (this.batchCommand) {
command = this.createCommand({ batch: true });
} else {
command = this.createCommand({ batch: false });
}
if (cmdName === 'add' || cmdName === 'remove') {
command.action = cmdName;
command.data.id = cell.id;
command.data.type = cell.attributes.type;
const attrs = cell.toJSON();
const isStickyNote = attrs.type.includes("generic.StickyNote");
const isLink = cell.isLink();
command.data.attributes = util.merge({}, {
id: attrs.id,
z: attrs.z,
// Links don't have position
...(!isLink && {position: attrs.position}),
// Links have "connector", "router", "source" and "target"
...(isLink && {connector: attrs.connector}),
...(isLink && {router: attrs.router}),
...(isLink && {source: attrs.source}),
...(isLink && {target: attrs.target}),
// Persist size only for sticky notes
...(isStickyNote && {size: attrs.size}),
// Sticky notes don't have ports
...(!isStickyNote && {ports: attrs.ports}),
})
this.push(command);
return;
}
const changedAttribute = cmdName.split("change:")[1];
if (!command.batch || !command.action) {
command.action = cmdName;
command.data.id = cell.id;
command.data.type = cell.attributes.type;
}
command.data.diff[changedAttribute] = this.differ.diff(
structuredClone(cell.previous(changedAttribute)),
structuredClone(cell.get(changedAttribute)),
);
this.push(command);
}
initBatchCommand() {
if (!this.batchCommand) {
this.batchCommand = [];
this.batchLevel = 0;
} else {
this.batchLevel++;
}
}
storeBatchCommand() {
if (this.batchCommand && this.batchLevel <= 0) {
if (this.batchCommand.length > 0) {
this.redoStack = [];
this._push(this.undoStack, this.batchCommand);
this.cm.trigger("stack:push");
this.cm.trigger('add', this.batchCommand);
}
this.batchCommand = null;
this.batchLevel = null;
} else if (this.batchCommand && this.batchLevel > 0) {
this.batchLevel--;
}
}
_createNodeAttrsFromPatch(cmd) {
const shapes = this.runtime.get("objects.shapes");
// Create the node with default attrs, then apply diff attrs
const shapeCls = get(shapes, cmd.data.type);
const node = new shapeCls();
if(node.enforceSettingsStructure) {
node.enforceSettingsStructure();
}
const attrs = util.merge(
node.toJSON(),
cmd.data.attributes,
);
node.remove();
return attrs;
}
_patchNodeAttrs(model, cmd, patchDirection) {
const attribute = cmd.action.split("change:")[1];
const data = structuredClone(model.get(attribute));
const diff = cmd.data.diff[attribute];
let patch;
if(patchDirection === "forward") {
patch = this.differ.patch(data, diff);
} else if(patchDirection === "backward") {
patch = this.differ.unpatch(data, diff);
}
return [attribute, structuredClone(patch)];
}
revertCommand(command) {
this.logger.debug("Reverting commands...");
this.cm.stopListening();
[].concat(command).reverse().forEach(cmd => {
const model = this.graph.getCell(cmd.data.id);
if(cmd.action === "add") {
this.logger.debug(`\tundoing [${cmd.action}] -> ${cmd.data.type}`);
if(model) {
model.remove();
}
} else if(cmd.action === "remove") {
this.logger.debug(`\tundoing [${cmd.action}] -> ${cmd.data.type}`);
const attrs = this._createNodeAttrsFromPatch(cmd);
this.graph.addCell(attrs);
} else {
this.logger.debug(`\tundoing [${cmd.action}] -> ${cmd.data.type}`);
const [attribute, patch] = this._patchNodeAttrs(model, cmd, "backward");
model.set(attribute, patch);
}
});
this.listen();
}
applyCommand(command) {
this.logger.debug("Applying commands...");
this.cm.stopListening();
[].concat(command).forEach(cmd => {
const model = this.graph.getCell(cmd.data.id);
if(cmd.action === "add") {
this.logger.debug(`\t[${cmd.action}] -> ${cmd.data.type}`);
const attrs = this._createNodeAttrsFromPatch(cmd);
this.graph.addCell(attrs);
} else if(cmd.action === "remove") {
this.logger.debug(`\t[${cmd.action}] -> ${cmd.data.type}`);
model.remove();
} else {
this.logger.debug(`\t[${cmd.action}] -> ${cmd.data.type}`);
const [attribute, patch] = this._patchNodeAttrs(model, cmd, "forward");
model.set(attribute, patch);
}
});
this.listen();
}
undo() {
const command = this.undoStack.pop();
if(command) {
this.revertCommand(command);
this.redoStack.push(command);
}
}
redo() {
const command = this.redoStack.pop();
if(command) {
this.applyCommand(command);
this.undoStack.push(command);
}
}
cancel() {
const command = this.undoStack.pop()
if(command) {
this.revertCommand(command);
this.redoStack = [];
}
}
reset() {
this.undoStack = [];
this.redoStack = [];
}
hasUndo() {
return this.undoStack.length > 0;
}
hasRedo() {
return this.redoStack.length > 0;
}
toJSON() {
return {
undo: structuredClone(this.undoStack),
redo: structuredClone(this.redoStack),
};
}
fromJSON(json) {
this.undoStack = structuredClone(json.undo);
this.redoStack = structuredClone(json.redo);
}
}