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
|
/**
* Copyright Marc J. Schmidt. See the LICENSE file at the top-level
* directory of this distribution and at
* https://github.com/marcj/css-element-queries/blob/master/LICENSE.
*/
;
(function() {
/**
* Class for dimension change detection.
*
* @param {Element|Element[]|Elements|jQuery} element
* @param {Function} callback
*
* @constructor
*/
this.ResizeSensor = function(element, callback) {
/**
*
* @constructor
*/
function EventQueue() {
this.q = [];
this.add = function(ev) {
this.q.push(ev);
};
var i, j;
this.call = function() {
for (i = 0, j = this.q.length; i < j; i++) {
this.q[i].call();
}
};
}
/**
* @param {HTMLElement} element
* @param {String} prop
* @returns {String|Number}
*/
function getComputedStyle(element, prop) {
if (element.currentStyle) {
return element.currentStyle[prop];
} else if (window.getComputedStyle) {
return window.getComputedStyle(element, null).getPropertyValue(prop);
} else {
return element.style[prop];
}
}
/**
*
* @param {HTMLElement} element
* @param {Function} resized
*/
function attachResizeEvent(element, resized) {
if (!element.resizedAttached) {
element.resizedAttached = new EventQueue();
element.resizedAttached.add(resized);
} else if (element.resizedAttached) {
element.resizedAttached.add(resized);
return;
}
element.resizeSensor = document.createElement('div');
element.resizeSensor.className = 'resize-sensor';
var style = 'position: absolute; left: 0; top: 0; right: 0; bottom: 0; overflow: scroll; z-index: -1; visibility: hidden;';
var styleChild = 'position: absolute; left: 0; top: 0;';
element.resizeSensor.style.cssText = style;
element.resizeSensor.innerHTML =
'<div class="resize-sensor-expand" style="' + style + '">' +
'<div style="' + styleChild + '"></div>' +
'</div>' +
'<div class="resize-sensor-shrink" style="' + style + '">' +
'<div style="' + styleChild + ' width: 200%; height: 200%"></div>' +
'</div>';
element.appendChild(element.resizeSensor);
if (!{fixed: 1, absolute: 1}[getComputedStyle(element, 'position')]) {
element.style.position = 'relative';
}
var expand = element.resizeSensor.childNodes[0];
var expandChild = expand.childNodes[0];
var shrink = element.resizeSensor.childNodes[1];
var shrinkChild = shrink.childNodes[0];
var lastWidth, lastHeight;
var reset = function() {
expandChild.style.width = expand.offsetWidth + 10 + 'px';
expandChild.style.height = expand.offsetHeight + 10 + 'px';
expand.scrollLeft = expand.scrollWidth;
expand.scrollTop = expand.scrollHeight;
shrink.scrollLeft = shrink.scrollWidth;
shrink.scrollTop = shrink.scrollHeight;
lastWidth = element.offsetWidth;
lastHeight = element.offsetHeight;
};
reset();
var changed = function() {
if (element.resizedAttached) {
element.resizedAttached.call();
}
};
var addEvent = function(el, name, cb) {
if (el.attachEvent) {
el.attachEvent('on' + name, cb);
} else {
el.addEventListener(name, cb);
}
};
var onScroll = function() {
if (element.offsetWidth != lastWidth || element.offsetHeight != lastHeight) {
changed();
}
reset();
}
addEvent(expand, 'scroll', onScroll);
addEvent(shrink, 'scroll', onScroll);
}
var elementType = Object.prototype.toString.call(element);
var isCollectionTyped = ('[object Array]' === elementType
|| ('[object NodeList]' === elementType)
|| ('[object HTMLCollection]' === elementType)
|| ('undefined' !== typeof jQuery && element instanceof jQuery) //jquery
|| ('undefined' !== typeof Elements && element instanceof Elements) //mootools
);
if (isCollectionTyped) {
var i = 0, j = element.length;
for (; i < j; i++) {
attachResizeEvent(element[i], callback);
}
} else {
attachResizeEvent(element, callback);
}
this.detach = function() {
if (isCollectionTyped) {
var i = 0, j = element.length;
for (; i < j; i++) {
ResizeSensor.detach(element[i]);
}
} else {
ResizeSensor.detach(element);
}
};
};
this.ResizeSensor.detach = function(element) {
if (element.resizeSensor) {
element.removeChild(element.resizeSensor);
delete element.resizeSensor;
delete element.resizedAttached;
}
};
})();
|
