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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/fontfaceobserver/src/ruler.js |
goog.provide('fontface.Ruler');
goog.require('dom');
goog.scope(function () {
/**
* @constructor
* @param {string} text
*/
fontface.Ruler = function (text) {
var style = 'max-width:none;' +
'display:inline-block;' +
'position:absolute;' +
'height:100%;' +
'width:100%;' +
'overflow:scroll;' +
'font-size:16px;';
this.element = dom.createElement('div');
this.element.setAttribute('aria-hidden', 'true');
dom.append(this.element, dom.createText(text));
this.collapsible = dom.createElement('span');
this.expandable = dom.createElement('span');
this.collapsibleInner = dom.createElement('span');
this.expandableInner = dom.createElement('span');
this.lastOffsetWidth = -1;
dom.style(this.collapsible, style);
dom.style(this.expandable, style);
dom.style(this.expandableInner, style);
dom.style(this.collapsibleInner, 'display:inline-block;width:200%;height:200%;font-size:16px;max-width:none;');
dom.append(this.collapsible, this.collapsibleInner);
dom.append(this.expandable, this.expandableInner);
dom.append(this.element, this.collapsible);
dom.append(this.element, this.expandable);
};
var Ruler = fontface.Ruler;
/**
* @return {Element}
*/
Ruler.prototype.getElement = function () {
return this.element;
};
/**
* @param {string} font
*/
Ruler.prototype.setFont = function (font) {
dom.style(this.element, 'max-width:none;' +
'min-width:20px;' +
'min-height:20px;' +
'display:inline-block;' +
'overflow:hidden;' +
'position:absolute;' +
'width:auto;' +
'margin:0;' +
'padding:0;' +
'top:-999px;' +
'white-space:nowrap;' +
'font-synthesis:none;' +
'font:' + font + ';');
};
/**
* @return {number}
*/
Ruler.prototype.getWidth = function () {
return this.element.offsetWidth;
};
/**
* @param {string} width
*/
Ruler.prototype.setWidth = function (width) {
this.element.style.width = width + 'px';
};
/**
* @private
*
* @return {boolean}
*/
Ruler.prototype.reset = function () {
var offsetWidth = this.getWidth(),
width = offsetWidth + 100;
this.expandableInner.style.width = width + 'px';
this.expandable.scrollLeft = width;
this.collapsible.scrollLeft = this.collapsible.scrollWidth + 100;
if (this.lastOffsetWidth !== offsetWidth) {
this.lastOffsetWidth = offsetWidth;
return true;
} else {
return false;
}
};
/**
* @private
* @param {function(number)} callback
*/
Ruler.prototype.onScroll = function (callback) {
if (this.reset() && this.element.parentNode !== null) {
callback(this.lastOffsetWidth);
}
};
/**
* @param {function(number)} callback
*/
Ruler.prototype.onResize = function (callback) {
var that = this;
function onScroll() {
that.onScroll(callback);
}
dom.addListener(this.collapsible, 'scroll', onScroll);
dom.addListener(this.expandable, 'scroll', onScroll);
this.reset();
};
});
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