forked from jquery-textfill/jquery-textfill
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jquery.textfill.js
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jquery.textfill.js
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/**
* @preserve textfill
* @name jquery.textfill.js
* @author Russ Painter
* @author Yu-Jie Lin
* @version 0.4.0
* @date 2013-08-16
* @copyright (c) 2012-2013 Yu-Jie Lin
* @copyright (c) 2009 Russ Painter
* @license MIT License
* @homepage https://github.com/jquery-textfill/jquery-textfill
* @example http://jquery-textfill.github.io/jquery-textfill/index.html
*/
; (function($) {
/**
* Resizes an inner element's font so that the inner element completely fills the outer element.
* @param {Object} Options which are maxFontPixels (default=40), innerTag (default='span')
* @return All outer elements processed
*/
$.fn.textfill = function(options) {
var defaults = {
debug: false,
maxFontPixels: 40,
minFontPixels: 4,
innerTag: 'span',
widthOnly: false,
success: null, // callback when a resizing is done
callback: null, // callback when a resizing is done (deprecated, use success)
fail: null, // callback when a resizing is failed
complete: null, // callback when all is done
explicitWidth: null,
explicitHeight: null
};
var Opts = $.extend(defaults, options);
function _sizing(prefix, ourText, func, max, maxHeight, maxWidth, minFontPixels, maxFontPixels) {
while (minFontPixels < maxFontPixels - 1) {
var fontSize = Math.floor((minFontPixels + maxFontPixels) / 2)
ourText.css('font-size', fontSize);
if (func.call(ourText) <= max) {
minFontPixels = fontSize;
if (func.call(ourText) == max) {
break;
}
} else {
maxFontPixels = fontSize;
}
}
ourText.css('font-size', maxFontPixels);
if (func.call(ourText) <= max) {
minFontPixels = maxFontPixels;
}
return minFontPixels;
}
this.each(function() {
var ourText = $(Opts.innerTag + ':visible:first', this);
// Use explicit dimensions when specified
var maxHeight = Opts.explicitHeight || $(this).height();
var maxWidth = Opts.explicitWidth || $(this).width();
var oldFontSize = ourText.css('font-size');
var fontSize;
var minFontPixels = Opts.minFontPixels;
var maxFontPixels = Opts.maxFontPixels <= 0 ? maxHeight : Opts.maxFontPixels;
var HfontSize = undefined;
if (!Opts.widthOnly) {
HfontSize = _sizing('H', ourText, $.fn.height, maxHeight, maxHeight, maxWidth, minFontPixels, maxFontPixels);
}
var WfontSize = _sizing('W', ourText, $.fn.width, maxWidth, maxHeight, maxWidth, minFontPixels, maxFontPixels);
if (Opts.widthOnly) {
ourText.css('font-size', WfontSize);
} else {
ourText.css('font-size', Math.min(HfontSize, WfontSize));
}
if (ourText.width() > maxWidth
|| (ourText.height() > maxHeight && !Opts.widthOnly)
) {
ourText.css('font-size', oldFontSize);
if (Opts.fail) {
Opts.fail(this);
}
} else if (Opts.success) {
Opts.success(this);
} else if (Opts.callback) {
// call callback on each result
Opts.callback(this);
}
});
// call complete when all is complete
if (Opts.complete) Opts.complete(this);
return this;
};
})(window.jQuery);