jquery-ui/ui/jquery.ui.position.js

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/*
* jQuery UI Position @VERSION
*
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* Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*
* http://docs.jquery.com/UI/Position
*/
(function( $, undefined ) {
$.ui = $.ui || {};
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var rhorizontal = /left|center|right/,
rvertical = /top|center|bottom/,
roffset = /[+-]\d+%?/,
rposition = /^\w+/,
rpercent = /%$/,
center = "center",
_position = $.fn.position;
$.position = {
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scrollbarWidth: function() {
var w1, w2,
div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
innerDiv = div.children()[0];
$( "body" ).append( div );
w1 = innerDiv.offsetWidth;
div.css( "overflow", "scroll" );
w2 = innerDiv.offsetWidth;
if ( w1 === w2 ) {
w2 = div[0].clientWidth;
}
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div.remove();
return w1 - w2;
},
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getScrollInfo: function( within ) {
var that = within[0],
scrollHeight = within.height() < that.scrollHeight,
scrollWidth = within.width() < that.scrollWidth,
scrollbarWidth = $.position.scrollbarWidth();
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return {
height: scrollHeight ? scrollbarWidth : 0,
width : scrollWidth ? scrollbarWidth : 0
};
}
};
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$.fn.position = function( options ) {
if ( !options || !options.of ) {
return _position.apply( this, arguments );
}
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// make a copy, we don't want to modify arguments
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options = $.extend( {}, options );
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var target = $( options.of ),
within = $( options.within || window ),
targetElem = target[0],
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collision = ( options.collision || "flip" ).split( " " ),
offsets = {},
atOffset,
targetWidth,
targetHeight,
basePosition;
if ( targetElem.nodeType === 9 ) {
targetWidth = target.width();
targetHeight = target.height();
basePosition = { top: 0, left: 0 };
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} else if ( $.isWindow( targetElem ) ) {
targetWidth = target.width();
targetHeight = target.height();
basePosition = { top: target.scrollTop(), left: target.scrollLeft() };
} else if ( targetElem.preventDefault ) {
// force left top to allow flipping
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options.at = "left top";
targetWidth = targetHeight = 0;
basePosition = { top: options.of.pageY, left: options.of.pageX };
} else {
targetWidth = target.outerWidth();
targetHeight = target.outerHeight();
basePosition = target.offset();
}
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// force my and at to have valid horizontal and vertical positions
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// if a value is missing or invalid, it will be converted to center
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$.each( [ "my", "at" ], function() {
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var pos = ( options[ this ] || "" ).split( " " ),
horizontalOffset,
verticalOffset;
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if ( pos.length === 1) {
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pos = rhorizontal.test( pos[ 0 ] ) ?
pos.concat( [ center ] ) :
rvertical.test( pos[ 0 ] ) ?
[ center ].concat( pos ) :
[ center, center ];
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}
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pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : center;
pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : center;
// calculate offsets
horizontalOffset = roffset.exec( pos[ 0 ] );
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verticalOffset = roffset.exec( pos[ 1 ] );
offsets[ this ] = [
horizontalOffset ? horizontalOffset[ 0 ] : 0,
verticalOffset ? verticalOffset[ 0 ] : 0
];
// reduce to just the positions without the offsets
options[ this ] = [
rposition.exec( pos[ 0 ] )[ 0 ],
rposition.exec( pos[ 1 ] )[ 0 ]
];
});
// normalize collision option
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if ( collision.length === 1 ) {
collision[ 1 ] = collision[ 0 ];
}
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if ( options.at[ 0 ] === "right" ) {
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basePosition.left += targetWidth;
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} else if ( options.at[ 0 ] === center ) {
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basePosition.left += targetWidth / 2;
}
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if ( options.at[ 1 ] === "bottom" ) {
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basePosition.top += targetHeight;
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} else if ( options.at[ 1 ] === center ) {
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basePosition.top += targetHeight / 2;
}
atOffset = [
parseInt( offsets.at[ 0 ], 10 ) *
( rpercent.test( offsets.at[ 0 ] ) ? targetWidth / 100 : 1 ),
parseInt( offsets.at[ 1 ], 10 ) *
( rpercent.test( offsets.at[ 1 ] ) ? targetHeight / 100 : 1 )
];
basePosition.left += atOffset[ 0 ];
basePosition.top += atOffset[ 1 ];
return this.each(function() {
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var elem = $( this ),
elemWidth = elem.outerWidth(),
elemHeight = elem.outerHeight(),
marginLeft = parseInt( $.curCSS( this, "marginLeft", true ) ) || 0,
marginTop = parseInt( $.curCSS( this, "marginTop", true ) ) || 0,
scrollInfo = $.position.getScrollInfo( within ),
collisionWidth = elemWidth + marginLeft +
( parseInt( $.curCSS( this, "marginRight", true ) ) || 0 ) + scrollInfo.width,
collisionHeight = elemHeight + marginTop +
( parseInt( $.curCSS( this, "marginBottom", true ) ) || 0 ) + scrollInfo.height,
position = $.extend( {}, basePosition ),
myOffset = [
parseInt( offsets.my[ 0 ], 10 ) *
( rpercent.test( offsets.my[ 0 ] ) ? elem.outerWidth() / 100 : 1 ),
parseInt( offsets.my[ 1 ], 10 ) *
( rpercent.test( offsets.my[ 1 ] ) ? elem.outerHeight() / 100 : 1 )
],
collisionPosition;
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if ( options.my[ 0 ] === "right" ) {
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position.left -= elemWidth;
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} else if ( options.my[ 0 ] === center ) {
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position.left -= elemWidth / 2;
}
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if ( options.my[ 1 ] === "bottom" ) {
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position.top -= elemHeight;
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} else if ( options.my[ 1 ] === center ) {
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position.top -= elemHeight / 2;
}
position.left += myOffset[ 0 ];
position.top += myOffset[ 1 ];
// prevent fractions (see #5280)
position.left = Math.round( position.left );
position.top = Math.round( position.top );
collisionPosition = {
left: position.left - marginLeft,
top: position.top - marginTop
};
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$.each( [ "left", "top" ], function( i, dir ) {
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if ( $.ui.position[ collision[ i ] ] ) {
$.ui.position[ collision[ i ] ][ dir ]( position, {
targetWidth: targetWidth,
targetHeight: targetHeight,
elemWidth: elemWidth,
elemHeight: elemHeight,
collisionPosition: collisionPosition,
collisionWidth: collisionWidth,
collisionHeight: collisionHeight,
offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
my: options.my,
at: options.at,
within: within,
elem : elem
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});
}
});
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if ( $.fn.bgiframe ) {
elem.bgiframe();
}
elem.offset( $.extend( position, { using: options.using } ) );
});
};
$.ui.position = {
fit: {
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left: function( position, data ) {
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var within = data.within,
win = $( window ),
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isWindow = $.isWindow( data.within[0] ),
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withinOffset = isWindow ? win.scrollLeft() : within.offset().left,
outerWidth = isWindow ? win.width() : within.outerWidth(),
overLeft = withinOffset - data.collisionPosition.left,
overRight = data.collisionPosition.left + data.collisionWidth - outerWidth - withinOffset;
// element is wider than window or too far left -> align with left edge
if ( data.collisionWidth > outerWidth || overLeft > 0 ) {
position.left += overLeft;
// too far right -> align with right edge
} else if ( overRight > 0 ) {
position.left -= overRight;
// adjust based on position and margin
} else {
position.left = Math.max( position.left - data.collisionPosition.left, position.left );
}
},
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top: function( position, data ) {
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var within = data.within,
win = $( window ),
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isWindow = $.isWindow( data.within[0] ),
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withinOffset = isWindow ? win.scrollTop() : within.offset().top,
outerHeight = isWindow ? win.height() : within.outerHeight(),
overTop = withinOffset - data.collisionPosition.top,
overBottom = data.collisionPosition.top + data.collisionHeight - outerHeight - withinOffset;
// element is taller than window or too far up -> align with top edge
if ( data.collisionHeight > outerHeight || overTop > 0 ) {
position.top += overTop;
// too far down -> align with bottom edge
} else if ( overBottom > 0 ) {
position.top -= overBottom;
// adjust based on position and margin
} else {
position.top = Math.max( position.top - data.collisionPosition.top, position.top );
}
}
},
flip: {
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left: function( position, data ) {
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if ( data.at[ 0 ] === center ) {
return;
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}
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data.elem
.removeClass( "ui-flipped-left ui-flipped-right" );
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var within = data.within,
win = $( window ),
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isWindow = $.isWindow( data.within[0] ),
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withinOffset = isWindow ? 0 : within.offset().left,
outerWidth = isWindow ? within.width() : within.outerWidth(),
overLeft = data.collisionPosition.left - withinOffset,
overRight = data.collisionPosition.left + data.collisionWidth - outerWidth - withinOffset,
left = data.my[ 0 ] === "left",
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myOffset = data.my[ 0 ] === "left" ?
-data.elemWidth :
data.my[ 0 ] === "right" ?
data.elemWidth :
0,
atOffset = data.at[ 0 ] === "left" ?
data.targetWidth :
-data.targetWidth,
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offset = -2 * data.offset[ 0 ];
if ( overLeft < 0 || overRight > 0 ) {
data.elem
.addClass( "ui-flipped-" + ( overLeft < 0 ? "right" : "left" ) );
position.left += myOffset + atOffset + offset;
}
},
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top: function( position, data ) {
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if ( data.at[ 1 ] === center ) {
return;
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}
data.elem
.removeClass( "ui-flipped-top ui-flipped-bottom" );
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var within = data.within,
win = $( window ),
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isWindow = $.isWindow( data.within[0] ),
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withinOffset = isWindow ? 0 : within.offset().top,
outerHeight = isWindow ? within.height() : within.outerHeight(),
overTop = data.collisionPosition.top - withinOffset,
overBottom = data.collisionPosition.top + data.collisionHeight - outerHeight - withinOffset,
top = data.my[ 1 ] === "top",
myOffset = top ?
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-data.elemHeight :
data.my[ 1 ] === "bottom" ?
data.elemHeight :
0,
atOffset = data.at[ 1 ] === "top" ?
data.targetHeight :
-data.targetHeight,
offset = -2 * data.offset[ 1 ];
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if ( overTop < 0 || overBottom > 0 ) {
data.elem
.addClass( "ui-flipped-" + ( overTop < 0 ? "bottom" : "top" ) );
position.top += myOffset + atOffset + offset;
}
}
}
};
// DEPRECATED
if ( $.uiBackCompat !== false ) {
// offset option
(function( $ ) {
var _position = $.fn.position;
$.fn.position = function( options ) {
if ( !options || !options.offset ) {
return _position.call( this, options );
}
var offset = options.offset.split( " " ),
at = options.at.split( " " );
if ( offset.length === 1 ) {
offset[ 1 ] = offset[ 0 ];
}
if ( /^\d/.test( offset[ 0 ] ) ) {
offset[ 0 ] = "+" + offset[ 0 ];
}
if ( /^\d/.test( offset[ 1 ] ) ) {
offset[ 1 ] = "+" + offset[ 1 ];
}
if ( at.length === 1 ) {
if ( /left|center|right/.test( at[ 0 ] ) ) {
at[ 1 ] = "center";
} else {
at[ 1 ] = at[ 0 ];
at[ 0 ] = "center";
}
}
return _position.call( this, $.extend( options, {
at: at[ 0 ] + offset[ 0 ] + " " + at[ 1 ] + offset[ 1 ],
offset: undefined
} ) );
}
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}( jQuery ) );
}
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}( jQuery ) );