290 lines
9.8 KiB
JavaScript
290 lines
9.8 KiB
JavaScript
/*! BigText - v1.0.1 - 2017-06-01
|
|
* https://github.com/zachleat/bigtext
|
|
* Copyright (c) 2017 Zach Leatherman (@zachleat)
|
|
* MIT License */
|
|
|
|
(function(window, $) {
|
|
"use strict";
|
|
|
|
var counter = 0,
|
|
$headCache = $('head'),
|
|
oldBigText = window.BigText,
|
|
oldjQueryMethod = $.fn.bigtext,
|
|
BigText = {
|
|
DEBUG_MODE: false,
|
|
DEFAULT_MIN_FONT_SIZE_PX: null,
|
|
DEFAULT_MAX_FONT_SIZE_PX: 528,
|
|
GLOBAL_STYLE_ID: 'bigtext-style',
|
|
STYLE_ID: 'bigtext-id',
|
|
LINE_CLASS_PREFIX: 'bigtext-line',
|
|
EXEMPT_CLASS: 'bigtext-exempt',
|
|
noConflict: function(restore)
|
|
{
|
|
if(restore) {
|
|
$.fn.bigtext = oldjQueryMethod;
|
|
window.BigText = oldBigText;
|
|
}
|
|
return BigText;
|
|
},
|
|
supports: {
|
|
wholeNumberFontSizeOnly: (function() {
|
|
if( !( 'getComputedStyle' in window ) ) {
|
|
return true;
|
|
}
|
|
var test = $('<div/>').css({
|
|
position: 'absolute',
|
|
'font-size': '14.1px'
|
|
}).insertBefore( $('script').eq(0) ),
|
|
computedStyle = window.getComputedStyle( test[0], null );
|
|
|
|
var ret = computedStyle && computedStyle.getPropertyValue( 'font-size' ) === '14px';
|
|
test.remove();
|
|
return ret;
|
|
})()
|
|
},
|
|
init: function() {
|
|
if(!$('#'+BigText.GLOBAL_STYLE_ID).length) {
|
|
$headCache.append(BigText.generateStyleTag(BigText.GLOBAL_STYLE_ID, ['.bigtext * { white-space: nowrap; } .bigtext > * { display: block; }',
|
|
'.bigtext .' + BigText.EXEMPT_CLASS + ', .bigtext .' + BigText.EXEMPT_CLASS + ' * { white-space: normal; }']));
|
|
}
|
|
},
|
|
bindResize: function(eventName, resizeFunction) {
|
|
var timeoutId;
|
|
$(window).unbind(eventName).bind(eventName, function() {
|
|
if( timeoutId ) {
|
|
clearTimeout( timeoutId );
|
|
}
|
|
timeoutId = setTimeout( resizeFunction, 100 );
|
|
});
|
|
},
|
|
getStyleId: function(id)
|
|
{
|
|
return BigText.STYLE_ID + '-' + id;
|
|
},
|
|
generateStyleTag: function(id, css)
|
|
{
|
|
return $('<style>' + css.join('\n') + '</style>').attr('id', id);
|
|
},
|
|
clearCss: function(id)
|
|
{
|
|
var styleId = BigText.getStyleId(id);
|
|
$('#' + styleId).remove();
|
|
},
|
|
generateCss: function(id, linesFontSizes, lineWordSpacings, minFontSizes)
|
|
{
|
|
var css = [];
|
|
|
|
BigText.clearCss(id);
|
|
|
|
for(var j=0, k=linesFontSizes.length; j<k; j++) {
|
|
css.push('#' + id + ' .' + BigText.LINE_CLASS_PREFIX + j + ' {' +
|
|
(minFontSizes[j] ? ' white-space: normal;' : '') +
|
|
(linesFontSizes[j] ? ' font-size: ' + linesFontSizes[j] + 'px;' : '') +
|
|
(lineWordSpacings[j] ? ' word-spacing: ' + lineWordSpacings[j] + 'px;' : '') +
|
|
'}');
|
|
}
|
|
|
|
return BigText.generateStyleTag(BigText.getStyleId(id), css);
|
|
},
|
|
jQueryMethod: function(options)
|
|
{
|
|
BigText.init();
|
|
|
|
options = $.extend({
|
|
minfontsize: BigText.DEFAULT_MIN_FONT_SIZE_PX,
|
|
maxfontsize: BigText.DEFAULT_MAX_FONT_SIZE_PX,
|
|
childSelector: '',
|
|
resize: true
|
|
}, options || {});
|
|
|
|
this.each(function()
|
|
{
|
|
var $t = $(this).addClass('bigtext'),
|
|
maxWidth = $t.width(),
|
|
id = $t.attr('id'),
|
|
$children = options.childSelector ? $t.find( options.childSelector ) : $t.children();
|
|
|
|
if(!id) {
|
|
id = 'bigtext-id' + (counter++);
|
|
$t.attr('id', id);
|
|
}
|
|
|
|
if(options.resize) {
|
|
BigText.bindResize('resize.bigtext-event-' + id, function()
|
|
{
|
|
// TODO only call this if the width has changed.
|
|
BigText.jQueryMethod.call($('#' + id), options);
|
|
});
|
|
}
|
|
|
|
BigText.clearCss(id);
|
|
|
|
$children.addClass(function(lineNumber, className)
|
|
{
|
|
// remove existing line classes.
|
|
return [className.replace(new RegExp('\\b' + BigText.LINE_CLASS_PREFIX + '\\d+\\b'), ''),
|
|
BigText.LINE_CLASS_PREFIX + lineNumber].join(' ');
|
|
});
|
|
|
|
var sizes = BigText.calculateSizes($t, $children, maxWidth, options.maxfontsize, options.minfontsize);
|
|
$headCache.append(BigText.generateCss(id, sizes.fontSizes, sizes.wordSpacings, sizes.minFontSizes));
|
|
});
|
|
|
|
return this.trigger('bigtext:complete');
|
|
},
|
|
testLineDimensions: function($line, maxWidth, property, size, interval, units, previousWidth)
|
|
{
|
|
var width;
|
|
previousWidth = typeof previousWidth === 'number' ? previousWidth : 0;
|
|
$line.css(property, size + units);
|
|
|
|
width = $line.width();
|
|
|
|
if(width >= maxWidth) {
|
|
// console.log(width, ' previous: ' + previousWidth, property + ' at ' + interval, 'prior: ' + (parseFloat(size) - interval), 'new:' + parseFloat(size));
|
|
$line.css(property, '');
|
|
|
|
if(width === maxWidth) {
|
|
return {
|
|
match: 'exact',
|
|
size: parseFloat((parseFloat(size) - 0.1).toFixed(3))
|
|
};
|
|
}
|
|
|
|
// Since this is an estimate, we calculate how far over the width we went with the new value.
|
|
// If this is word-spacing (our last resort guess) and the over is less than the under, we keep the higher value.
|
|
// Otherwise, we revert to the underestimate.
|
|
var under = maxWidth - previousWidth,
|
|
over = width - maxWidth;
|
|
|
|
return {
|
|
match: 'estimate',
|
|
size: parseFloat((parseFloat(size) - (property === 'word-spacing' && previousWidth && ( over < under ) ? 0 : interval)).toFixed(3))
|
|
};
|
|
}
|
|
|
|
return width;
|
|
},
|
|
calculateSizes: function($t, $children, maxWidth, maxFontSize, minFontSize)
|
|
{
|
|
var $c = $t.clone(true)
|
|
.addClass('bigtext-cloned')
|
|
.css({
|
|
fontFamily: $t.css('font-family'),
|
|
textTransform: $t.css('text-transform'),
|
|
wordSpacing: $t.css('word-spacing'),
|
|
letterSpacing: $t.css('letter-spacing'),
|
|
position: 'absolute',
|
|
left: BigText.DEBUG_MODE ? 0 : -9999,
|
|
top: BigText.DEBUG_MODE ? 0 : -9999
|
|
})
|
|
.appendTo(document.body);
|
|
|
|
// font-size isn't the only thing we can modify, we can also mess with:
|
|
// word-spacing and letter-spacing. WebKit does not respect subpixel
|
|
// letter-spacing, word-spacing, or font-size.
|
|
// TODO try -webkit-transform: scale() as a workaround.
|
|
var fontSizes = [],
|
|
wordSpacings = [],
|
|
minFontSizes = [],
|
|
ratios = [];
|
|
|
|
$children.css('float', 'left').each(function() {
|
|
var $line = $(this),
|
|
// TODO replace 8, 4 with a proportional size to the calculated font-size.
|
|
intervals = BigText.supports.wholeNumberFontSizeOnly ? [8, 4, 1] : [8, 4, 1, 0.1],
|
|
lineMax,
|
|
newFontSize;
|
|
|
|
if($line.hasClass(BigText.EXEMPT_CLASS)) {
|
|
fontSizes.push(null);
|
|
ratios.push(null);
|
|
minFontSizes.push(false);
|
|
return;
|
|
}
|
|
|
|
// TODO we can cache this ratio?
|
|
var autoGuessSubtraction = 32, // font size in px
|
|
currentFontSize = parseFloat($line.css('font-size')),
|
|
ratio = ( $line.width() / currentFontSize ).toFixed(6);
|
|
|
|
newFontSize = parseInt( maxWidth / ratio, 10 ) - autoGuessSubtraction;
|
|
|
|
outer: for(var m=0, n=intervals.length; m<n; m++) {
|
|
inner: for(var j=1, k=10; j<=k; j++) {
|
|
if(newFontSize + j*intervals[m] > maxFontSize) {
|
|
newFontSize = maxFontSize;
|
|
break outer;
|
|
}
|
|
|
|
lineMax = BigText.testLineDimensions($line, maxWidth, 'font-size', newFontSize + j*intervals[m], intervals[m], 'px', lineMax);
|
|
if(typeof lineMax !== 'number') {
|
|
newFontSize = lineMax.size;
|
|
|
|
if(lineMax.match === 'exact') {
|
|
break outer;
|
|
}
|
|
break inner;
|
|
}
|
|
}
|
|
}
|
|
|
|
ratios.push(maxWidth / newFontSize);
|
|
|
|
if(newFontSize > maxFontSize) {
|
|
fontSizes.push(maxFontSize);
|
|
minFontSizes.push(false);
|
|
} else if(!!minFontSize && newFontSize < minFontSize) {
|
|
fontSizes.push(minFontSize);
|
|
minFontSizes.push(true);
|
|
} else {
|
|
fontSizes.push(newFontSize);
|
|
minFontSizes.push(false);
|
|
}
|
|
}).each(function(lineNumber) {
|
|
var $line = $(this),
|
|
wordSpacing = 0,
|
|
interval = 1,
|
|
maxWordSpacing;
|
|
|
|
if($line.hasClass(BigText.EXEMPT_CLASS)) {
|
|
wordSpacings.push(null);
|
|
return;
|
|
}
|
|
|
|
// must re-use font-size, even though it was removed above.
|
|
$line.css('font-size', fontSizes[lineNumber] + 'px');
|
|
|
|
for(var m=1, n=3; m<n; m+=interval) {
|
|
maxWordSpacing = BigText.testLineDimensions($line, maxWidth, 'word-spacing', m, interval, 'px', maxWordSpacing);
|
|
if(typeof maxWordSpacing !== 'number') {
|
|
wordSpacing = maxWordSpacing.size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
$line.css('font-size', '');
|
|
wordSpacings.push(wordSpacing);
|
|
}).removeAttr('style');
|
|
|
|
if( !BigText.DEBUG_MODE ) {
|
|
$c.remove();
|
|
} else {
|
|
$c.css({
|
|
'background-color': 'rgba(255,255,255,.4)'
|
|
});
|
|
}
|
|
|
|
return {
|
|
fontSizes: fontSizes,
|
|
wordSpacings: wordSpacings,
|
|
ratios: ratios,
|
|
minFontSizes: minFontSizes
|
|
};
|
|
}
|
|
};
|
|
|
|
$.fn.bigtext = BigText.jQueryMethod;
|
|
window.BigText = BigText;
|
|
|
|
})(this, jQuery);
|