73bcce88
 luigser
COMPONENTS
|
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
|
<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<script>
/**
Polymer.IronFitBehavior fits an element in another element using `max-height` and `max-width`, and
optionally centers it in the window or another element.
The element will only be sized and/or positioned if it has not already been sized and/or positioned
by CSS.
CSS properties | Action
-----------------------------|-------------------------------------------
`position` set | Element is not centered horizontally or vertically
`top` or `bottom` set | Element is not vertically centered
`left` or `right` set | Element is not horizontally centered
`max-height` or `height` set | Element respects `max-height` or `height`
`max-width` or `width` set | Element respects `max-width` or `width`
@demo demo/index.html
@polymerBehavior
*/
Polymer.IronFitBehavior = {
properties: {
/**
* The element that will receive a `max-height`/`width`. By default it is the same as `this`,
* but it can be set to a child element. This is useful, for example, for implementing a
* scrolling region inside the element.
* @type {!Element}
*/
sizingTarget: {
type: Object,
value: function() {
return this;
}
},
/**
* The element to fit `this` into.
*/
fitInto: {
type: Object,
value: window
},
/**
* Set to true to auto-fit on attach.
*/
autoFitOnAttach: {
type: Boolean,
value: false
},
/** @type {?Object} */
_fitInfo: {
type: Object
}
},
get _fitWidth() {
var fitWidth;
if (this.fitInto === window) {
fitWidth = this.fitInto.innerWidth;
} else {
fitWidth = this.fitInto.getBoundingClientRect().width;
}
return fitWidth;
},
get _fitHeight() {
var fitHeight;
if (this.fitInto === window) {
fitHeight = this.fitInto.innerHeight;
} else {
fitHeight = this.fitInto.getBoundingClientRect().height;
}
return fitHeight;
},
get _fitLeft() {
var fitLeft;
if (this.fitInto === window) {
fitLeft = 0;
} else {
fitLeft = this.fitInto.getBoundingClientRect().left;
}
return fitLeft;
},
get _fitTop() {
var fitTop;
if (this.fitInto === window) {
fitTop = 0;
} else {
fitTop = this.fitInto.getBoundingClientRect().top;
}
return fitTop;
},
attached: function() {
if (this.autoFitOnAttach) {
if (window.getComputedStyle(this).display === 'none') {
setTimeout(function() {
this.fit();
}.bind(this));
} else {
this.fit();
}
}
},
/**
* Fits and optionally centers the element into the window, or `fitInfo` if specified.
*/
fit: function() {
this._discoverInfo();
this.constrain();
this.center();
},
/**
* Memoize information needed to position and size the target element.
*/
_discoverInfo: function() {
if (this._fitInfo) {
return;
}
var target = window.getComputedStyle(this);
var sizer = window.getComputedStyle(this.sizingTarget);
this._fitInfo = {
inlineStyle: {
top: this.style.top || '',
left: this.style.left || ''
},
positionedBy: {
vertically: target.top !== 'auto' ? 'top' : (target.bottom !== 'auto' ?
'bottom' : null),
horizontally: target.left !== 'auto' ? 'left' : (target.right !== 'auto' ?
'right' : null),
css: target.position
},
sizedBy: {
height: sizer.maxHeight !== 'none',
width: sizer.maxWidth !== 'none'
},
margin: {
top: parseInt(target.marginTop, 10) || 0,
right: parseInt(target.marginRight, 10) || 0,
bottom: parseInt(target.marginBottom, 10) || 0,
left: parseInt(target.marginLeft, 10) || 0
}
};
},
/**
* Resets the target element's position and size constraints, and clear
* the memoized data.
*/
resetFit: function() {
if (!this._fitInfo || !this._fitInfo.sizedBy.height) {
this.sizingTarget.style.maxHeight = '';
this.style.top = this._fitInfo ? this._fitInfo.inlineStyle.top : '';
}
if (!this._fitInfo || !this._fitInfo.sizedBy.width) {
this.sizingTarget.style.maxWidth = '';
this.style.left = this._fitInfo ? this._fitInfo.inlineStyle.left : '';
}
if (this._fitInfo) {
this.style.position = this._fitInfo.positionedBy.css;
}
this._fitInfo = null;
},
/**
* Equivalent to calling `resetFit()` and `fit()`. Useful to call this after the element,
* the window, or the `fitInfo` element has been resized.
*/
refit: function() {
this.resetFit();
this.fit();
},
/**
* Constrains the size of the element to the window or `fitInfo` by setting `max-height`
* and/or `max-width`.
*/
constrain: function() {
var info = this._fitInfo;
// position at (0px, 0px) if not already positioned, so we can measure the natural size.
if (!this._fitInfo.positionedBy.vertically) {
this.style.top = '0px';
}
if (!this._fitInfo.positionedBy.horizontally) {
this.style.left = '0px';
}
|
|
73bcce88
luigser
COMPONENTS
|
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
|
// need border-box for margin/padding
this.sizingTarget.style.boxSizing = 'border-box';
// constrain the width and height if not already set
var rect = this.getBoundingClientRect();
if (!info.sizedBy.height) {
this._sizeDimension(rect, info.positionedBy.vertically, 'top', 'bottom', 'Height');
}
if (!info.sizedBy.width) {
this._sizeDimension(rect, info.positionedBy.horizontally, 'left', 'right', 'Width');
}
},
_sizeDimension: function(rect, positionedBy, start, end, extent) {
var info = this._fitInfo;
var max = extent === 'Width' ? this._fitWidth : this._fitHeight;
var flip = (positionedBy === end);
var offset = flip ? max - rect[end] : rect[start];
var margin = info.margin[flip ? start : end];
var offsetExtent = 'offset' + extent;
var sizingOffset = this[offsetExtent] - this.sizingTarget[offsetExtent];
this.sizingTarget.style['max' + extent] = (max - margin - offset - sizingOffset) + 'px';
},
/**
* Centers horizontally and vertically if not already positioned. This also sets
* `position:fixed`.
*/
center: function() {
if (!this._fitInfo.positionedBy.vertically || !this._fitInfo.positionedBy.horizontally) {
// need position:fixed to center
this.style.position = 'fixed';
}
if (!this._fitInfo.positionedBy.vertically) {
var top = (this._fitHeight - this.offsetHeight) / 2 + this._fitTop;
top -= this._fitInfo.margin.top;
this.style.top = top + 'px';
}
if (!this._fitInfo.positionedBy.horizontally) {
var left = (this._fitWidth - this.offsetWidth) / 2 + this._fitLeft;
left -= this._fitInfo.margin.left;
this.style.left = left + 'px';
}
}
};
</script>
|
