blob: ea1b90184f5fe814d3524498e27526375221d921 (
plain)
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
|
/**
* Hooks allow for injecting functions that must all complete in order before finishing
* They will execute in parallel but all must finish before continuing
* Functions may return a promise if they are asycn.
* @param {any} context scope of this
* @example this.content = new EPUBJS.Hook(this);
*/
class Hook {
constructor(context){
this.context = context || this;
this.hooks = [];
}
/**
* Adds a function to be run before a hook completes
* @example this.content.register(function(){...});
*/
register(){
for(var i = 0; i < arguments.length; ++i) {
if (typeof arguments[i] === "function") {
this.hooks.push(arguments[i]);
} else {
// unpack array
for(var j = 0; j < arguments[i].length; ++j) {
this.hooks.push(arguments[i][j]);
}
}
}
}
/**
* Removes a function
* @example this.content.deregister(function(){...});
*/
deregister(func){
let hook;
for (let i = 0; i < this.hooks.length; i++) {
hook = this.hooks[i];
if (hook === func) {
this.hooks.splice(i, 1);
break;
}
}
}
/**
* Triggers a hook to run all functions
* @example this.content.trigger(args).then(function(){...});
*/
trigger(){
var args = arguments;
var context = this.context;
var promises = [];
this.hooks.forEach(function(task) {
try {
var executing = task.apply(context, args);
} catch (err) {
console.log(err);
}
if(executing && typeof executing["then"] === "function") {
// Task is a function that returns a promise
promises.push(executing);
}
// Otherwise Task resolves immediately, continue
});
return Promise.all(promises);
}
// Adds a function to be run before a hook completes
list(){
return this.hooks;
}
clear(){
return this.hooks = [];
}
}
export default Hook;
|
