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Positions: added conditional suppression of position rounding #419

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inukshuk wants to merge 7 commits into from
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Positions: added conditional suppression of position rounding #419

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43115ae
Position: added test whether jQuery.offset supports fractions and sup…
inukshuk Aug 3, 2011
fc2893f
Merge remote-tracking branch 'upstream/1-8-stable' into 1-8-stable
inukshuk Sep 7, 2011
41dc845
Position: re-activated consistency test #5280
inukshuk Sep 7, 2011
957a80b
Position: fixes fractions test in FF6
inukshuk Sep 7, 2011
10d8609
Position: lazily execute fraction test
inukshuk Sep 7, 2011
c0dd5fd
Position: fixes assignment of test result
inukshuk Sep 8, 2011
54307ec
Position: fixed fractions test for IE9
inukshuk Sep 14, 2011
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34 changes: 17 additions & 17 deletions tests/unit/position/position_core.js
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Original file line number Diff line number Diff line change
Expand Up @@ -406,22 +406,22 @@ test("collision: flip, with margin", function() {
}, { top: 0, left: 0 }, "right bottom");
});

//test('bug #5280: consistent results (avoid fractional values)', function() {
// var wrapper = $('#bug-5280'),
// elem = wrapper.children(),
// offset1 = elem.position({
// my: 'center',
// at: 'center',
// of: wrapper,
// collision: 'none'
// }).offset(),
// offset2 = elem.position({
// my: 'center',
// at: 'center',
// of: wrapper,
// collision: 'none'
// }).offset();
// same(offset1, offset2);
//});
test('bug #5280: consistent results (avoid fractional values)', function() {
var wrapper = $('#bug-5280'),
elem = wrapper.children(),
offset1 = elem.position({
my: 'center',
at: 'center',
of: wrapper,
collision: 'none'
}).offset(),
offset2 = elem.position({
my: 'center',
at: 'center',
of: wrapper,
collision: 'none'
}).offset();
same(offset1, offset2);
});

})(jQuery);
31 changes: 29 additions & 2 deletions ui/jquery.ui.position.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ $.ui = $.ui || {};
var horizontalPositions = /left|center|right/,
verticalPositions = /top|center|bottom/,
center = "center",
support = {},
_position = $.fn.position,
_offset = $.fn.offset;

Expand Down Expand Up @@ -122,8 +123,10 @@ $.fn.position = function( options ) {
}

// prevent fractions (see #5280)
position.left = Math.round( position.left );
position.top = Math.round( position.top );
if (!support.fractions) {
position.left = Math.round( position.left );
position.top = Math.round( position.top );
}

collisionPosition = {
left: position.left - marginLeft,
Expand Down Expand Up @@ -249,4 +252,28 @@ if ( !$.offset.setOffset ) {
};
}

// support fractions (older versions of jquery don't support fractions)
$(function () {
var body = document.body, offset,
div = $(body.appendChild( document.createElement( "div" ) ) );

$.extend( div[0].style, {
position: 'absolute',
left: '10.2432222px',
top: '10.432325px',
height: '30px',
width: '201px'
});

offset = div.offset();
div.offset(offset);
offset = div.offset();

// set display to none to avoid a layout bug in IE
// http://dev.jquery.com/ticket/4014
body.removeChild( div[0] ).style.display = "none";

support.fractions = offset.top + offset.left > 20.0;
});

}( jQuery ));