72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
define( [
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"../core",
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"../var/rcssNum"
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], function( jQuery, rcssNum ) {
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"use strict";
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function adjustCSS( elem, prop, valueParts, tween ) {
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var adjusted,
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scale = 1,
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maxIterations = 20,
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currentValue = tween ?
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function() {
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return tween.cur();
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} :
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function() {
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return jQuery.css( elem, prop, "" );
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},
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initial = currentValue(),
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unit = valueParts && valueParts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),
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// Starting value computation is required for potential unit mismatches
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initialInUnit = ( jQuery.cssNumber[ prop ] || unit !== "px" && +initial ) &&
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rcssNum.exec( jQuery.css( elem, prop ) );
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if ( initialInUnit && initialInUnit[ 3 ] !== unit ) {
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// Trust units reported by jQuery.css
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unit = unit || initialInUnit[ 3 ];
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// Make sure we update the tween properties later on
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valueParts = valueParts || [];
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// Iteratively approximate from a nonzero starting point
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initialInUnit = +initial || 1;
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do {
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// If previous iteration zeroed out, double until we get *something*.
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// Use string for doubling so we don't accidentally see scale as unchanged below
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scale = scale || ".5";
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// Adjust and apply
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initialInUnit = initialInUnit / scale;
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jQuery.style( elem, prop, initialInUnit + unit );
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// Update scale, tolerating zero or NaN from tween.cur()
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// Break the loop if scale is unchanged or perfect, or if we've just had enough.
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} while (
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scale !== ( scale = currentValue() / initial ) && scale !== 1 && --maxIterations
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);
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}
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if ( valueParts ) {
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initialInUnit = +initialInUnit || +initial || 0;
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// Apply relative offset (+=/-=) if specified
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adjusted = valueParts[ 1 ] ?
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initialInUnit + ( valueParts[ 1 ] + 1 ) * valueParts[ 2 ] :
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+valueParts[ 2 ];
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if ( tween ) {
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tween.unit = unit;
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tween.start = initialInUnit;
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tween.end = adjusted;
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}
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}
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return adjusted;
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}
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return adjustCSS;
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} );
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