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

/*!
 * jQuery UI Position @VERSION
 *
 * Copyright 2012, 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 || {};

var rhorizontal = /left|center|right/,
	rvertical = /top|center|bottom/,
	roffset = /[\+\-]\d+%?/,
	rposition = /^\w+/,
	rpercent = /%$/,
	center = "center",
	_position = $.fn.position;

$.position = {
	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;
		}

		div.remove();

		return w1 - w2;
	},
	getScrollInfo: function(within) {
		var notWindow = within[0] !== window,
			overflowX = notWindow ? within.css( "overflow-x" ) : "",
			overflowY = notWindow ? within.css( "overflow-y" ) : "",
			scrollbarWidth = overflowX === "auto" || overflowX === "scroll" ? $.position.scrollbarWidth() : 0,
			scrollbarHeight = overflowY === "auto" || overflowY === "scroll" ? $.position.scrollbarWidth() : 0;

		return {
			height: within.height() < within[0].scrollHeight ? scrollbarHeight : 0,
			width: within.width() < within[0].scrollWidth ? scrollbarWidth : 0
		};
	}
};

$.fn.position = function( options ) {
	if ( !options || !options.of ) {
		return _position.apply( this, arguments );
	}

	// make a copy, we don't want to modify arguments
	options = $.extend( {}, options );

	var target = $( options.of ),
		within  = $( options.within || window ),
		targetElem = target[0],
		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 };
	} 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
		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();
	}

	// force my and at to have valid horizontal and vertical positions
	// if a value is missing or invalid, it will be converted to center
	$.each( [ "my", "at" ], function() {
		var pos = ( options[ this ] || "" ).split( " " ),
			horizontalOffset,
			verticalOffset;

		if ( pos.length === 1) {
			pos = rhorizontal.test( pos[ 0 ] ) ?
				pos.concat( [ center ] ) :
				rvertical.test( pos[ 0 ] ) ?
					[ center ].concat( pos ) :
					[ center, center ];
		}
		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 ] );
		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
	if ( collision.length === 1 ) {
		collision[ 1 ] = collision[ 0 ];
	}

	if ( options.at[ 0 ] === "right" ) {
		basePosition.left += targetWidth;
	} else if ( options.at[ 0 ] === center ) {
		basePosition.left += targetWidth / 2;
	}

	if ( options.at[ 1 ] === "bottom" ) {
		basePosition.top += targetHeight;
	} else if ( options.at[ 1 ] === center ) {
		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() {
		var elem = $( this ),
			elemWidth = elem.outerWidth(),
			elemHeight = elem.outerHeight(),
			marginLeft = parseInt( $.css( this, "marginLeft" ), 10 ) || 0,
			marginTop = parseInt( $.css( this, "marginTop" ), 10 ) || 0,
			scrollInfo = $.position.getScrollInfo( within ),
			collisionWidth = elemWidth + marginLeft +
				( parseInt( $.css( this, "marginRight" ), 10 ) || 0 ) + scrollInfo.width,
			collisionHeight = elemHeight + marginTop +
				( parseInt( $.css( this, "marginBottom" ), 10 ) || 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;

		if ( options.my[ 0 ] === "right" ) {
			position.left -= elemWidth;
		} else if ( options.my[ 0 ] === center ) {
			position.left -= elemWidth / 2;
		}

		if ( options.my[ 1 ] === "bottom" ) {
			position.top -= elemHeight;
		} else if ( options.my[ 1 ] === center ) {
			position.top -= elemHeight / 2;
		}

		position.left += myOffset[ 0 ];
		position.top += myOffset[ 1 ];

		// if the browser doesn't support fractions, then round for consistent results
		if ( !$.support.offsetFractions ) {
			position.left = Math.round( position.left );
			position.top = Math.round( position.top );
		}

		collisionPosition = {
			marginLeft: marginLeft,
			marginTop: marginTop
		};

		$.each( [ "left", "top" ], function( i, dir ) {
			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
				});
			}
		});

		if ( $.fn.bgiframe ) {
			elem.bgiframe();
		}
		elem.offset( $.extend( position, { using: options.using } ) );
	});
};

$.ui.position = {
	fit: {
		left: function( position, data ) {
			var within = data.within,
				win = $( window ),
				isWindow = $.isWindow( data.within[0] ),
				withinOffset = isWindow ? win.scrollLeft() : within.offset().left,
				outerWidth = isWindow ? win.width() : within.outerWidth(),
				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
				overLeft = withinOffset - collisionPosLeft,
				overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
				newOverRight,
				newOverLeft;

			// element is wider than within
			if ( data.collisionWidth > outerWidth ) {
				// element is initially over the left side of within
				if ( overLeft > 0 && overRight <= 0 ) {
					newOverRight = position.left + overLeft + data.collisionWidth - outerWidth - withinOffset;
					position.left += overLeft - newOverRight;
				// element is initially over right side of within
				} else if ( overRight > 0 && overLeft <= 0 ) {
					position.left = withinOffset;
				// element is initially over both left and right sides of within
				} else {
					if ( overLeft > overRight ) {
						position.left = withinOffset + outerWidth - data.collisionWidth;
					} else {
						position.left = withinOffset;
					}
				}
			// too far left -> align with left edge
			} else if ( 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 - collisionPosLeft, position.left );
			}
		},
		top: function( position, data ) {
			var within = data.within,
				win = $( window ),
				isWindow = $.isWindow( data.within[0] ),
				withinOffset = isWindow ? win.scrollTop() : within.offset().top,
				outerHeight = isWindow ? win.height() : within.outerHeight(),
				collisionPosTop = position.top - data.collisionPosition.marginTop,
				overTop = withinOffset - collisionPosTop,
				overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
				newOverTop,
				newOverBottom;

			// element is taller than within
			if ( data.collisionHeight > outerHeight ) {
				// element is initially over the top of within
				if ( overTop > 0 && overBottom <= 0 ) {
					newOverBottom = position.top + overTop + data.collisionHeight - outerHeight - withinOffset;
					position.top += overTop - newOverBottom;
				// element is initially over bottom of within
				} else if ( overBottom > 0 && overTop <= 0 ) {
					position.top = withinOffset;
				// element is initially over both top and bottom of within
				} else {
					if ( overTop > overBottom ) {
						position.top = withinOffset + outerHeight - data.collisionHeight;
					} else {
						position.top = withinOffset;
					}
				}
			// too far up -> align with top
			} else if ( 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 - collisionPosTop, position.top );
			}
		}
	},
	flip: {
		left: function( position, data ) {
			if ( data.at[ 0 ] === center ) {
				return;
			}

			data.elem
				.removeClass( "ui-flipped-left ui-flipped-right" );

			var within = data.within,
				win = $( window ),
				isWindow = $.isWindow( data.within[0] ),
				withinOffset = ( isWindow ? 0 : within.offset().left ) + within.scrollLeft(),
				outerWidth = isWindow ? within.width() : within.outerWidth(),
				offsetLeft = isWindow ? 0 : within.offset().left,
				collisionPosLeft = position.left - data.collisionPosition.marginLeft,
				overLeft = collisionPosLeft - offsetLeft,
				overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
				left = data.my[ 0 ] === "left",
				myOffset = data.my[ 0 ] === "left" ?
					-data.elemWidth :
					data.my[ 0 ] === "right" ?
						data.elemWidth :
						0,
				atOffset = data.at[ 0 ] === "left" ?
					data.targetWidth :
					-data.targetWidth,
				offset = -2 * data.offset[ 0 ],
				newOverRight,
				newOverLeft;

			if ( overLeft < 0 ) {
				newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth - outerWidth - withinOffset;
				if ( newOverRight < 0 || newOverRight < Math.abs( overLeft ) ) {
					data.elem
						.addClass( "ui-flipped-right" );

					position.left += myOffset + atOffset + offset;
				}
			}
			else if ( overRight > 0 ) {
				newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset + atOffset + offset - offsetLeft;
				if ( newOverLeft > 0 || Math.abs( newOverLeft ) < overRight ) {
					data.elem
						.addClass( "ui-flipped-left" );

					position.left += myOffset + atOffset + offset;
				}
			}
		},
		top: function( position, data ) {
			if ( data.at[ 1 ] === center ) {
				return;
			}

			data.elem
				.removeClass( "ui-flipped-top ui-flipped-bottom" );

			var within = data.within,
				win = $( window ),
				isWindow = $.isWindow( data.within[0] ),
				withinOffset = ( isWindow ? 0 : within.offset().top ) + within.scrollTop(),
				outerHeight = isWindow ? within.height() : within.outerHeight(),
				offsetTop = isWindow ? 0 : within.offset().top,
				collisionPosTop = position.top - data.collisionPosition.marginTop,
				overTop = collisionPosTop - offsetTop,
				overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
				top = data.my[ 1 ] === "top",
				myOffset = top ?
					-data.elemHeight :
					data.my[ 1 ] === "bottom" ?
						data.elemHeight :
						0,
				atOffset = data.at[ 1 ] === "top" ?
					data.targetHeight :
					-data.targetHeight,
				offset = -2 * data.offset[ 1 ],
				newOverTop,
				newOverBottom;
			if ( overTop < 0 ) {
				newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight - outerHeight - withinOffset;
				if ( ( position.top + myOffset + atOffset + offset) > overTop && ( newOverBottom < 0 || newOverBottom < Math.abs( overTop ) ) ) {
					data.elem
						.addClass( "ui-flipped-bottom" );

					position.top += myOffset + atOffset + offset;
				}
			}
			else if ( overBottom > 0 ) {
				newOverTop = position.top -  data.collisionPosition.marginTop + myOffset + atOffset + offset - offsetTop;
				if ( ( position.top + myOffset + atOffset + offset) > overBottom && ( newOverTop > 0 || Math.abs( newOverTop ) < overBottom ) ) {
					data.elem
						.addClass( "ui-flipped-top" );

					position.top += myOffset + atOffset + offset;
				}
			}
		}
	},
	flipfit: {
		left: function() {
			$.ui.position.flip.left.apply( this, arguments );
			$.ui.position.fit.left.apply( this, arguments );
		},
		top: function() {
			$.ui.position.flip.top.apply( this, arguments );
			$.ui.position.fit.top.apply( this, arguments );
		}
	}
};

// fraction support test
(function () {
	var testElement, testElementParent, testElementStyle, offsetLeft, i,
		body = document.getElementsByTagName( "body" )[ 0 ],
		div = document.createElement( "div" );

	//Create a "fake body" for testing based on method used in jQuery.support
	testElement = document.createElement( body ? "div" : "body" );
	testElementStyle = {
		visibility: "hidden",
		width: 0,
		height: 0,
		border: 0,
		margin: 0,
		background: "none"
	};
	if ( body ) {
		$.extend( testElementStyle, {
			position: "absolute",
			left: "-1000px",
			top: "-1000px"
		});
	}
	for ( i in testElementStyle ) {
		testElement.style[ i ] = testElementStyle[ i ];
	}
	testElement.appendChild( div );
	testElementParent = body || document.documentElement;
	testElementParent.insertBefore( testElement, testElementParent.firstChild );

	div.style.cssText = "position: absolute; left: 10.7432222px;";

	offsetLeft = $( div ).offset().left;
	$.support.offsetFractions = offsetLeft > 10 && offsetLeft < 11;

	testElement.innerHTML = "";
	testElementParent.removeChild( testElement );
})();

// 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
			} ) );
		};
	}( jQuery ) );
}

}( jQuery ) );