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
|
// ==========================================
// Copyright 2013 Twitter, Inc
// Licensed under The MIT License
// http://opensource.org/licenses/MIT
// ==========================================
"use strict";
define(
[
'./utils'
],
function (util) {
function parseEventArgs(instance, args) {
var element, type, callback;
var end = args.length;
if (typeof args[end - 1] === 'function') {
end -= 1;
callback = args[end];
}
if (typeof args[end - 1] === 'object') {
end -= 1;
}
if (end == 2) {
element = args[0];
type = args[1];
} else {
element = instance.node;
type = args[0];
}
return {
element: element,
type: type,
callback: callback
};
}
function matchEvent(a, b) {
return (
(a.element == b.element) &&
(a.type == b.type) &&
(b.callback == null || (a.callback == b.callback))
);
}
function Registry() {
var registry = this;
(this.reset = function() {
this.components = [];
this.allInstances = {};
this.events = [];
}).call(this);
function ComponentInfo(component) {
this.component = component;
this.attachedTo = [];
this.instances = {};
this.addInstance = function(instance) {
var instanceInfo = new InstanceInfo(instance);
this.instances[instance.identity] = instanceInfo;
this.attachedTo.push(instance.node);
return instanceInfo;
}
this.removeInstance = function(instance) {
delete this.instances[instance.identity];
var indexOfNode = this.attachedTo.indexOf(instance.node);
(indexOfNode > -1) && this.attachedTo.splice(indexOfNode, 1);
if (!this.instances.length) {
//if I hold no more instances remove me from registry
registry.removeComponentInfo(this);
}
}
this.isAttachedTo = function(node) {
return this.attachedTo.indexOf(node) > -1;
}
}
function InstanceInfo(instance) {
this.instance = instance;
this.events = [];
this.addBind = function(event) {
this.events.push(event);
registry.events.push(event);
};
this.removeBind = function(event) {
for (var i = 0, e; e = this.events[i]; i++) {
if (matchEvent(e, event)) {
this.events.splice(i, 1);
}
}
}
}
this.addInstance = function(instance) {
var component = this.findComponentInfo(instance);
if (!component) {
component = new ComponentInfo(instance.constructor);
this.components.push(component);
}
var inst = component.addInstance(instance);
this.allInstances[instance.identity] = inst;
return component;
};
this.removeInstance = function(instance) {
var index, instInfo = this.findInstanceInfo(instance);
//remove from component info
var componentInfo = this.findComponentInfo(instance);
componentInfo && componentInfo.removeInstance(instance);
//remove from registry
delete this.allInstances[instance.identity];
};
this.removeComponentInfo = function(componentInfo) {
var index = this.components.indexOf(componentInfo);
(index > -1) && this.components.splice(index, 1);
};
this.findComponentInfo = function(which) {
var component = which.attachTo ? which : which.constructor;
for (var i = 0, c; c = this.components[i]; i++) {
if (c.component === component) {
return c;
}
}
return null;
};
this.findInstanceInfo = function(instance) {
return this.allInstances[instance.identity] || null;
};
this.findInstanceInfoByNode = function(node) {
var result = [];
Object.keys(this.allInstances).forEach(function(k) {
var thisInstanceInfo = this.allInstances[k];
if(thisInstanceInfo.instance.node === node) {
result.push(thisInstanceInfo);
}
}, this);
return result;
};
this.on = function(componentOn) {
var instance = registry.findInstanceInfo(this), boundCallback;
// unpacking arguments by hand benchmarked faster
var l = arguments.length, i = 1;
var otherArgs = new Array(l - 1);
for (; i < l; i++) otherArgs[i - 1] = arguments[i];
if (instance) {
boundCallback = componentOn.apply(null, otherArgs);
if (boundCallback) {
otherArgs[otherArgs.length-1] = boundCallback;
}
var event = parseEventArgs(this, otherArgs);
instance.addBind(event);
}
};
this.off = function(el, type, callback) {
var event = parseEventArgs(this, arguments),
instance = registry.findInstanceInfo(this);
if (instance) {
instance.removeBind(event);
}
};
//debug tools may want to add advice to trigger
if (window.DEBUG && DEBUG.enabled) {
registry.trigger = new Function;
}
this.teardown = function() {
registry.removeInstance(this);
};
this.withRegistration = function() {
this.before('initialize', function() {
registry.addInstance(this);
});
this.around('on', registry.on);
this.after('off', registry.off);
//debug tools may want to add advice to trigger
window.DEBUG && DEBUG.enabled && this.after('trigger', registry.trigger);
this.after('teardown', {obj:registry, fnName:'teardown'});
};
}
return new Registry;
}
);
|