73bcce88
 luigser
COMPONENTS
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<!--
@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';
}
// 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>
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