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Polymer({
is: 'iron-iconset',
properties: {
/**
* The URL of the iconset image.
*
* @attribute src
* @type string
* @default ''
*/
src: {
type: String,
observer: '_srcChanged'
},
/**
* The name of the iconset.
*
* @attribute name
* @type string
* @default 'no-name'
*/
name: {
type: String,
observer: '_nameChanged'
},
/**
* The width of the iconset image. This must only be specified if the
* icons are arranged into separate rows inside the image.
*
* @attribute width
* @type number
* @default 0
*/
width: {
type: Number,
value: 0
},
/**
* A space separated list of names corresponding to icons in the iconset
* image file. This list must be ordered the same as the icon images
* in the image file.
*
* @attribute icons
* @type string
* @default ''
*/
icons: {
type: String
},
/**
* The size of an individual icon. Note that icons must be square.
*
* @attribute size
* @type number
* @default 24
*/
size: {
type: Number,
value: 24
},
/**
* The horizontal offset of the icon images in the inconset src image.
* This is typically used if the image resource contains additional images
* beside those intended for the iconset.
*
* @attribute offset-x
* @type number
* @default 0
*/
_offsetX: {
type: Number,
value: 0
},
/**
* The vertical offset of the icon images in the inconset src image.
* This is typically used if the image resource contains additional images
* beside those intended for the iconset.
*
* @attribute offset-y
* @type number
* @default 0
*/
_offsetY: {
type: Number,
value: 0
},
/**
* Array of fully-qualified names of icons in this set.
*/
iconNames: {
type: Array,
notify: true
}
},
hostAttributes: {
// non-visual
style: 'display: none;'
},
ready: function() {
// theme data must exist at ready-time
this._themes = this._mapThemes();
},
/**
* Applies an icon to the given element as a css background image. This
* method does not size the element, and it's usually necessary to set
* the element's height and width so that the background image is visible.
*
* @method applyIcon
* @param {Element} element The element to which the icon is applied.
* @param {String|Number} icon The name or index of the icon to apply.
* @param {String} theme (optional) The name or index of the icon to apply.
* @param {Number} scale (optional, defaults to 1) Icon scaling factor.
*/
applyIcon: function(element, icon, theme, scale) {
this._validateIconMap();
var offset = this._getThemedOffset(icon, theme);
if (element && offset) {
this._addIconStyles(element, this._srcUrl, offset, scale || 1,
this.size, this.width);
}
},
/**
* Remove an icon from the given element by undoing the changes effected
* by `applyIcon`.
*
* @param {Element} element The element from which the icon is removed.
*/
removeIcon: function(element) {
this._removeIconStyles(element.style);
},
_mapThemes: function() {
var themes = Object.create(null);
Polymer.dom(this).querySelectorAll('property[theme]')
.forEach(function(property) {
var offsetX = window.parseInt(
property.getAttribute('offset-x'), 10
) || 0;
var offsetY = window.parseInt(
property.getAttribute('offset-y'), 10
) || 0;
themes[property.getAttribute('theme')] = {
offsetX: offsetX,
offsetY: offsetY
};
});
return themes;
},
_srcChanged: function(src) {
// ensure `srcUrl` is always relative to the main document
this._srcUrl = this.ownerDocument !== document
? this.resolveUrl(src) : src;
this._prepareIconset();
},
_nameChanged: function(name) {
this._prepareIconset();
},
_prepareIconset: function() {
new Polymer.IronMeta({type: 'iconset', key: this.name, value: this});
},
_invalidateIconMap: function() {
this._iconMapValid = false;
},
_validateIconMap: function() {
if (!this._iconMapValid) {
this._recomputeIconMap();
this._iconMapValid = true;
}
},
_recomputeIconMap: function() {
this.iconNames = this._computeIconNames(this.icons);
this.iconMap = this._computeIconMap(this._offsetX, this._offsetY,
this.size, this.width, this.iconNames);
},
_computeIconNames: function(icons) {
return icons.split(/\s+/g);
},
_computeIconMap: function(offsetX, offsetY, size, width, iconNames) {
var iconMap = {};
if (offsetX !== undefined && offsetY !== undefined) {
var x0 = offsetX;
iconNames.forEach(function(iconName) {
iconMap[iconName] = {
offsetX: offsetX,
offsetY: offsetY
};
if ((offsetX + size) < width) {
offsetX += size;
} else {
offsetX = x0;
offsetY += size;
}
}, this);
}
return iconMap;
},
/**
* Returns an object containing `offsetX` and `offsetY` properties which
* specify the pixel location in the iconset's src file for the given
* `icon` and `theme`. It's uncommon to call this method. It is useful,
* for example, to manually position a css backgroundImage to the proper
* offset. It's more common to use the `applyIcon` method.
*
* @method getThemedOffset
* @param {String|Number} identifier The name of the icon or the index of
* the icon within in the icon image.
* @param {String} theme The name of the theme.
* @returns {Object} An object specifying the offset of the given icon
* within the icon resource file; `offsetX` is the horizontal offset and
* `offsetY` is the vertical offset. Both values are in pixel units.
*/
_getThemedOffset: function(identifier, theme) {
var iconOffset = this._getIconOffset(identifier);
var themeOffset = this._themes[theme];
if (iconOffset && themeOffset) {
return {
offsetX: iconOffset.offsetX + themeOffset.offsetX,
offsetY: iconOffset.offsetY + themeOffset.offsetY
};
}
return iconOffset;
},
_getIconOffset: function(identifier) {
// TODO(sjmiles): consider creating offsetArray (indexed by Number)
// and having iconMap map names to indices, then and index is just
// iconMap[identifier] || identifier (be careful of zero, store indices
// as 1-based)
return this.iconMap[identifier] ||
this.iconMap[this.iconNames[Number(identifier)]];
},
_addIconStyles: function(element, url, offset, scale, size, width) {
var style = element.style;
style.backgroundImage = 'url(' + url + ')';
style.backgroundPosition =
(-offset.offsetX * scale + 'px') + ' ' +
(-offset.offsetY * scale + 'px');
style.backgroundSize = (scale === 1) ? 'auto' : width * scale + 'px';
style.width = size + 'px';
style.height = size + 'px';
element.setAttribute('role', 'img');
},
_removeIconStyles: function(style) {
style.background = '';
}
});
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