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(function() {
'use strict';
function classNames(obj) {
var classNames = [];
for (var key in obj) {
if (obj.hasOwnProperty(key) && obj[key]) {
classNames.push(key);
}
}
return classNames.join(' ');
}
Polymer({
is: 'paper-toolbar',
hostAttributes: {
'role': 'toolbar'
},
properties: {
/**
* Controls how the items are aligned horizontally when they are placed
* at the bottom.
* Options are `start`, `center`, `end`, `justified` and `around`.
*
* @attribute bottomJustify
* @type string
* @default ''
*/
bottomJustify: {
type: String,
value: ''
},
/**
* Controls how the items are aligned horizontally.
* Options are `start`, `center`, `end`, `justified` and `around`.
*
* @attribute justify
* @type string
* @default ''
*/
justify: {
type: String,
value: ''
},
/**
* Controls how the items are aligned horizontally when they are placed
* in the middle.
* Options are `start`, `center`, `end`, `justified` and `around`.
*
* @attribute middleJustify
* @type string
* @default ''
*/
middleJustify: {
type: String,
value: ''
}
},
attached: function() {
this._observer = this._observe(this);
this._updateAriaLabelledBy();
},
detached: function() {
if (this._observer) {
this._observer.disconnect();
}
},
_observe: function(node) {
var observer = new MutationObserver(function() {
this._updateAriaLabelledBy();
}.bind(this));
observer.observe(node, {
childList: true,
subtree: true
});
return observer;
},
_updateAriaLabelledBy: function() {
var labelledBy = [];
var contents = Polymer.dom(this.root).querySelectorAll('content');
for (var content, index = 0; content = contents[index]; index++) {
var nodes = Polymer.dom(content).getDistributedNodes();
for (var node, jndex = 0; node = nodes[jndex]; jndex++) {
if (node.classList && node.classList.contains('title')) {
if (node.id) {
labelledBy.push(node.id);
} else {
var id = 'paper-toolbar-label-' + Math.floor(Math.random() * 10000);
node.id = id;
labelledBy.push(id);
}
}
}
}
if (labelledBy.length > 0) {
this.setAttribute('aria-labelledby', labelledBy.join(' '));
}
},
_computeBarClassName: function(barJustify) {
var classObj = {
'center': true,
'horizontal': true,
'layout': true,
'toolbar-tools': true
};
// If a blank string or any falsy value is given, no other class name is
// added.
if (barJustify) {
var justifyClassName = (barJustify === 'justified') ?
barJustify :
barJustify + '-justified';
classObj[justifyClassName] = true;
}
return classNames(classObj);
}
});
}());
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