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1 define( [
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2 "../core",
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3 "../var/rcssNum"
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4 ], function( jQuery, rcssNum ) {
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5
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6 "use strict";
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7
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8 function adjustCSS( elem, prop, valueParts, tween ) {
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9 var adjusted, scale,
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10 maxIterations = 20,
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11 currentValue = tween ?
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12 function() {
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13 return tween.cur();
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14 } :
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15 function() {
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16 return jQuery.css( elem, prop, "" );
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17 },
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18 initial = currentValue(),
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19 unit = valueParts && valueParts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),
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20
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21 // Starting value computation is required for potential unit mismatches
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22 initialInUnit = ( jQuery.cssNumber[ prop ] || unit !== "px" && +initial ) &&
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23 rcssNum.exec( jQuery.css( elem, prop ) );
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24
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25 if ( initialInUnit && initialInUnit[ 3 ] !== unit ) {
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26
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27 // Support: Firefox <=54
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28 // Halve the iteration target value to prevent interference from CSS upper bounds (gh-2144)
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29 initial = initial / 2;
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30
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31 // Trust units reported by jQuery.css
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32 unit = unit || initialInUnit[ 3 ];
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33
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34 // Iteratively approximate from a nonzero starting point
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35 initialInUnit = +initial || 1;
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36
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37 while ( maxIterations-- ) {
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38
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39 // Evaluate and update our best guess (doubling guesses that zero out).
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40 // Finish if the scale equals or crosses 1 (making the old*new product non-positive).
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41 jQuery.style( elem, prop, initialInUnit + unit );
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42 if ( ( 1 - scale ) * ( 1 - ( scale = currentValue() / initial || 0.5 ) ) <= 0 ) {
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43 maxIterations = 0;
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44 }
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45 initialInUnit = initialInUnit / scale;
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46
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47 }
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48
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49 initialInUnit = initialInUnit * 2;
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50 jQuery.style( elem, prop, initialInUnit + unit );
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51
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52 // Make sure we update the tween properties later on
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53 valueParts = valueParts || [];
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54 }
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55
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56 if ( valueParts ) {
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57 initialInUnit = +initialInUnit || +initial || 0;
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58
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59 // Apply relative offset (+=/-=) if specified
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60 adjusted = valueParts[ 1 ] ?
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61 initialInUnit + ( valueParts[ 1 ] + 1 ) * valueParts[ 2 ] :
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62 +valueParts[ 2 ];
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63 if ( tween ) {
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64 tween.unit = unit;
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65 tween.start = initialInUnit;
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66 tween.end = adjusted;
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67 }
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68 }
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69 return adjusted;
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70 }
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71
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72 return adjustCSS;
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73 } );
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