mirror of
https://github.com/jquery/jquery-ui.git
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501 lines
15 KiB
JavaScript
501 lines
15 KiB
JavaScript
/*!
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* jQuery UI Position @VERSION
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* http://jqueryui.com
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*
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* Copyright jQuery Foundation and other contributors
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* Released under the MIT license.
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* http://jquery.org/license
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*
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* http://api.jqueryui.com/position/
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*/
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//>>label: Position
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//>>group: UI Core
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//>>description: Positions elements relative to other elements.
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//>>docs: http://api.jqueryui.com/position/
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//>>demos: http://jqueryui.com/position/
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( function( factory ) {
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if ( typeof define === "function" && define.amd ) {
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// AMD. Register as an anonymous module.
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define( [ "jquery", "./version" ], factory );
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} else {
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// Browser globals
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factory( jQuery );
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}
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}( function( $ ) {
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( function() {
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var cachedScrollbarWidth, supportsOffsetFractions,
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max = Math.max,
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abs = Math.abs,
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round = Math.round,
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rhorizontal = /left|center|right/,
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rvertical = /top|center|bottom/,
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roffset = /[\+\-]\d+(\.[\d]+)?%?/,
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rposition = /^\w+/,
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rpercent = /%$/,
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_position = $.fn.position;
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// Support: IE <=9 only
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supportsOffsetFractions = function() {
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var element = $( "<div>" )
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.css( "position", "absolute" )
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.appendTo( "body" )
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.offset( {
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top: 1.5,
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left: 1.5
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} ),
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support = element.offset().top === 1.5;
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element.remove();
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supportsOffsetFractions = function() {
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return support;
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};
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return support;
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};
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function getOffsets( offsets, width, height ) {
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return [
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parseFloat( offsets[ 0 ] ) * ( rpercent.test( offsets[ 0 ] ) ? width / 100 : 1 ),
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parseFloat( offsets[ 1 ] ) * ( rpercent.test( offsets[ 1 ] ) ? height / 100 : 1 )
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];
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}
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function parseCss( element, property ) {
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return parseInt( $.css( element, property ), 10 ) || 0;
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}
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function getDimensions( elem ) {
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var raw = elem[ 0 ];
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if ( raw.nodeType === 9 ) {
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return {
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width: elem.width(),
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height: elem.height(),
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offset: { top: 0, left: 0 }
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};
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}
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if ( $.isWindow( raw ) ) {
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return {
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width: elem.width(),
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height: elem.height(),
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offset: { top: elem.scrollTop(), left: elem.scrollLeft() }
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};
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}
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if ( raw.preventDefault ) {
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return {
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width: 0,
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height: 0,
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offset: { top: raw.pageY, left: raw.pageX }
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};
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}
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return {
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width: elem.outerWidth(),
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height: elem.outerHeight(),
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offset: elem.offset()
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};
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}
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$.position = {
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scrollbarWidth: function() {
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if ( cachedScrollbarWidth !== undefined ) {
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return cachedScrollbarWidth;
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}
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var w1, w2,
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div = $( "<div style='display:block;position:absolute;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
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innerDiv = div.children()[ 0 ];
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$( "body" ).append( div );
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w1 = innerDiv.offsetWidth;
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div.css( "overflow", "scroll" );
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w2 = innerDiv.offsetWidth;
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if ( w1 === w2 ) {
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w2 = div[ 0 ].clientWidth;
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}
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div.remove();
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return ( cachedScrollbarWidth = w1 - w2 );
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},
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getScrollInfo: function( within ) {
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var overflowX = within.isWindow || within.isDocument ? "" :
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within.element.css( "overflow-x" ),
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overflowY = within.isWindow || within.isDocument ? "" :
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within.element.css( "overflow-y" ),
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hasOverflowX = overflowX === "scroll" ||
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( overflowX === "auto" && within.width < within.element[ 0 ].scrollWidth ),
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hasOverflowY = overflowY === "scroll" ||
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( overflowY === "auto" && within.height < within.element[ 0 ].scrollHeight );
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return {
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width: hasOverflowY ? $.position.scrollbarWidth() : 0,
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height: hasOverflowX ? $.position.scrollbarWidth() : 0
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};
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},
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getWithinInfo: function( element ) {
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var withinElement = $( element || window ),
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isWindow = $.isWindow( withinElement[ 0 ] ),
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isDocument = !!withinElement[ 0 ] && withinElement[ 0 ].nodeType === 9,
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hasOffset = !isWindow && !isDocument;
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return {
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element: withinElement,
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isWindow: isWindow,
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isDocument: isDocument,
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offset: hasOffset ? $( element ).offset() : { left: 0, top: 0 },
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scrollLeft: withinElement.scrollLeft(),
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scrollTop: withinElement.scrollTop(),
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width: withinElement.outerWidth(),
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height: withinElement.outerHeight()
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};
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}
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};
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$.fn.position = function( options ) {
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if ( !options || !options.of ) {
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return _position.apply( this, arguments );
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}
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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 atOffset, targetWidth, targetHeight, targetOffset, basePosition, dimensions,
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target = $( options.of ),
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within = $.position.getWithinInfo( options.within ),
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scrollInfo = $.position.getScrollInfo( within ),
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collision = ( options.collision || "flip" ).split( " " ),
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offsets = {};
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dimensions = getDimensions( target );
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if ( target[ 0 ].preventDefault ) {
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// force left top to allow flipping
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options.at = "left top";
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}
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targetWidth = dimensions.width;
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targetHeight = dimensions.height;
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targetOffset = dimensions.offset;
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// clone to reuse original targetOffset later
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basePosition = $.extend( {}, targetOffset );
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// force my and at to have valid horizontal and vertical positions
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// if a value is missing or invalid, it will be converted to center
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$.each( [ "my", "at" ], function() {
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var pos = ( options[ this ] || "" ).split( " " ),
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horizontalOffset,
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verticalOffset;
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if ( pos.length === 1 ) {
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pos = rhorizontal.test( pos[ 0 ] ) ?
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pos.concat( [ "center" ] ) :
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rvertical.test( pos[ 0 ] ) ?
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[ "center" ].concat( pos ) :
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[ "center", "center" ];
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}
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pos[ 0 ] = rhorizontal.test( pos[ 0 ] ) ? pos[ 0 ] : "center";
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pos[ 1 ] = rvertical.test( pos[ 1 ] ) ? pos[ 1 ] : "center";
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// calculate offsets
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horizontalOffset = roffset.exec( pos[ 0 ] );
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verticalOffset = roffset.exec( pos[ 1 ] );
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offsets[ this ] = [
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horizontalOffset ? horizontalOffset[ 0 ] : 0,
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verticalOffset ? verticalOffset[ 0 ] : 0
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];
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// reduce to just the positions without the offsets
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options[ this ] = [
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rposition.exec( pos[ 0 ] )[ 0 ],
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rposition.exec( pos[ 1 ] )[ 0 ]
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];
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} );
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// normalize collision option
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if ( collision.length === 1 ) {
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collision[ 1 ] = collision[ 0 ];
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}
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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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}
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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;
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}
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atOffset = getOffsets( offsets.at, targetWidth, targetHeight );
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basePosition.left += atOffset[ 0 ];
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basePosition.top += atOffset[ 1 ];
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return this.each( function() {
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var collisionPosition, using,
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elem = $( this ),
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elemWidth = elem.outerWidth(),
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elemHeight = elem.outerHeight(),
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marginLeft = parseCss( this, "marginLeft" ),
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marginTop = parseCss( this, "marginTop" ),
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collisionWidth = elemWidth + marginLeft + parseCss( this, "marginRight" ) + scrollInfo.width,
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collisionHeight = elemHeight + marginTop + parseCss( this, "marginBottom" ) + scrollInfo.height,
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position = $.extend( {}, basePosition ),
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myOffset = getOffsets( offsets.my, elem.outerWidth(), elem.outerHeight() );
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if ( options.my[ 0 ] === "right" ) {
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position.left -= elemWidth;
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} else if ( options.my[ 0 ] === "center" ) {
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position.left -= elemWidth / 2;
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}
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if ( options.my[ 1 ] === "bottom" ) {
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position.top -= elemHeight;
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} else if ( options.my[ 1 ] === "center" ) {
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position.top -= elemHeight / 2;
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}
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position.left += myOffset[ 0 ];
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position.top += myOffset[ 1 ];
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// if the browser doesn't support fractions, then round for consistent results
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if ( !supportsOffsetFractions() ) {
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position.left = round( position.left );
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position.top = round( position.top );
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}
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collisionPosition = {
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marginLeft: marginLeft,
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marginTop: marginTop
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};
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$.each( [ "left", "top" ], function( i, dir ) {
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if ( $.ui.position[ collision[ i ] ] ) {
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$.ui.position[ collision[ i ] ][ dir ]( position, {
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targetWidth: targetWidth,
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targetHeight: targetHeight,
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elemWidth: elemWidth,
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elemHeight: elemHeight,
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collisionPosition: collisionPosition,
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collisionWidth: collisionWidth,
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collisionHeight: collisionHeight,
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offset: [ atOffset[ 0 ] + myOffset[ 0 ], atOffset [ 1 ] + myOffset[ 1 ] ],
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my: options.my,
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at: options.at,
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within: within,
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elem: elem
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} );
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}
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} );
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if ( options.using ) {
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// adds feedback as second argument to using callback, if present
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using = function( props ) {
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var left = targetOffset.left - position.left,
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right = left + targetWidth - elemWidth,
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top = targetOffset.top - position.top,
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bottom = top + targetHeight - elemHeight,
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feedback = {
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target: {
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element: target,
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left: targetOffset.left,
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top: targetOffset.top,
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width: targetWidth,
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height: targetHeight
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},
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element: {
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element: elem,
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left: position.left,
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top: position.top,
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width: elemWidth,
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height: elemHeight
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},
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horizontal: right < 0 ? "left" : left > 0 ? "right" : "center",
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vertical: bottom < 0 ? "top" : top > 0 ? "bottom" : "middle"
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};
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if ( targetWidth < elemWidth && abs( left + right ) < targetWidth ) {
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feedback.horizontal = "center";
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}
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if ( targetHeight < elemHeight && abs( top + bottom ) < targetHeight ) {
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feedback.vertical = "middle";
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}
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if ( max( abs( left ), abs( right ) ) > max( abs( top ), abs( bottom ) ) ) {
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feedback.important = "horizontal";
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} else {
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feedback.important = "vertical";
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}
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options.using.call( this, props, feedback );
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};
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}
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elem.offset( $.extend( position, { using: using } ) );
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} );
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};
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$.ui.position = {
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fit: {
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left: function( position, data ) {
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var within = data.within,
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withinOffset = within.isWindow ? within.scrollLeft : within.offset.left,
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outerWidth = within.width,
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collisionPosLeft = position.left - data.collisionPosition.marginLeft,
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overLeft = withinOffset - collisionPosLeft,
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overRight = collisionPosLeft + data.collisionWidth - outerWidth - withinOffset,
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newOverRight;
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// element is wider than within
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if ( data.collisionWidth > outerWidth ) {
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// element is initially over the left side of within
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if ( overLeft > 0 && overRight <= 0 ) {
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newOverRight = position.left + overLeft + data.collisionWidth - outerWidth - withinOffset;
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position.left += overLeft - newOverRight;
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// element is initially over right side of within
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} else if ( overRight > 0 && overLeft <= 0 ) {
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position.left = withinOffset;
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// element is initially over both left and right sides of within
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} else {
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if ( overLeft > overRight ) {
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position.left = withinOffset + outerWidth - data.collisionWidth;
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} else {
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position.left = withinOffset;
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}
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}
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// too far left -> align with left edge
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} else if ( overLeft > 0 ) {
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position.left += overLeft;
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// too far right -> align with right edge
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} else if ( overRight > 0 ) {
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position.left -= overRight;
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// adjust based on position and margin
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} else {
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position.left = max( position.left - collisionPosLeft, position.left );
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}
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},
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top: function( position, data ) {
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var within = data.within,
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withinOffset = within.isWindow ? within.scrollTop : within.offset.top,
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outerHeight = data.within.height,
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collisionPosTop = position.top - data.collisionPosition.marginTop,
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overTop = withinOffset - collisionPosTop,
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overBottom = collisionPosTop + data.collisionHeight - outerHeight - withinOffset,
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newOverBottom;
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// element is taller than within
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if ( data.collisionHeight > outerHeight ) {
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// element is initially over the top of within
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if ( overTop > 0 && overBottom <= 0 ) {
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newOverBottom = position.top + overTop + data.collisionHeight - outerHeight - withinOffset;
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position.top += overTop - newOverBottom;
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// element is initially over bottom of within
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} else if ( overBottom > 0 && overTop <= 0 ) {
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position.top = withinOffset;
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// element is initially over both top and bottom of within
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} else {
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if ( overTop > overBottom ) {
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position.top = withinOffset + outerHeight - data.collisionHeight;
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} else {
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position.top = withinOffset;
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}
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}
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// too far up -> align with top
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} else if ( overTop > 0 ) {
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position.top += overTop;
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// too far down -> align with bottom edge
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} else if ( overBottom > 0 ) {
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position.top -= overBottom;
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// adjust based on position and margin
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} else {
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position.top = max( position.top - collisionPosTop, position.top );
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}
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}
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},
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flip: {
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left: function( position, data ) {
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var within = data.within,
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withinOffset = within.offset.left + within.scrollLeft,
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outerWidth = within.width,
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offsetLeft = within.isWindow ? within.scrollLeft : within.offset.left,
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collisionPosLeft = position.left - data.collisionPosition.marginLeft,
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overLeft = collisionPosLeft - offsetLeft,
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overRight = collisionPosLeft + data.collisionWidth - outerWidth - offsetLeft,
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myOffset = data.my[ 0 ] === "left" ?
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-data.elemWidth :
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data.my[ 0 ] === "right" ?
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data.elemWidth :
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0,
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atOffset = data.at[ 0 ] === "left" ?
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data.targetWidth :
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data.at[ 0 ] === "right" ?
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-data.targetWidth :
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0,
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offset = -2 * data.offset[ 0 ],
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newOverRight,
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newOverLeft;
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if ( overLeft < 0 ) {
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newOverRight = position.left + myOffset + atOffset + offset + data.collisionWidth - outerWidth - withinOffset;
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if ( newOverRight < 0 || newOverRight < abs( overLeft ) ) {
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position.left += myOffset + atOffset + offset;
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}
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} else if ( overRight > 0 ) {
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newOverLeft = position.left - data.collisionPosition.marginLeft + myOffset + atOffset + offset - offsetLeft;
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if ( newOverLeft > 0 || abs( newOverLeft ) < overRight ) {
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position.left += myOffset + atOffset + offset;
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}
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}
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},
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top: function( position, data ) {
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var within = data.within,
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withinOffset = within.offset.top + within.scrollTop,
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outerHeight = within.height,
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offsetTop = within.isWindow ? within.scrollTop : within.offset.top,
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collisionPosTop = position.top - data.collisionPosition.marginTop,
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overTop = collisionPosTop - offsetTop,
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overBottom = collisionPosTop + data.collisionHeight - outerHeight - offsetTop,
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top = data.my[ 1 ] === "top",
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myOffset = top ?
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-data.elemHeight :
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data.my[ 1 ] === "bottom" ?
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data.elemHeight :
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0,
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atOffset = data.at[ 1 ] === "top" ?
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data.targetHeight :
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data.at[ 1 ] === "bottom" ?
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-data.targetHeight :
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0,
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offset = -2 * data.offset[ 1 ],
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newOverTop,
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newOverBottom;
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if ( overTop < 0 ) {
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newOverBottom = position.top + myOffset + atOffset + offset + data.collisionHeight - outerHeight - withinOffset;
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if ( newOverBottom < 0 || newOverBottom < abs( overTop ) ) {
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position.top += myOffset + atOffset + offset;
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}
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} else if ( overBottom > 0 ) {
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newOverTop = position.top - data.collisionPosition.marginTop + myOffset + atOffset + offset - offsetTop;
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if ( newOverTop > 0 || abs( newOverTop ) < overBottom ) {
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position.top += myOffset + atOffset + offset;
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}
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}
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}
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},
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flipfit: {
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left: function() {
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$.ui.position.flip.left.apply( this, arguments );
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$.ui.position.fit.left.apply( this, arguments );
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},
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top: function() {
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$.ui.position.flip.top.apply( this, arguments );
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$.ui.position.fit.top.apply( this, arguments );
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}
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}
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};
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} )();
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return $.ui.position;
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} ) );
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