source: main/trunk/greenstone3/web/interfaces/oran/js/jquery-ui-1.8rc1/ui/jquery.ui.position.js@ 24245

/*
 * jQuery UI Position 1.8rc1
 *
 * Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Position
 */
(function($) {

$.ui = $.ui || {};

var horizontalPositions = /left|center|right/,
    horizontalDefault = 'center',
    verticalPositions = /top|center|bottom/,
    verticalDefault = 'center',
    _position = $.fn.position;

$.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),
        collision = (options.collision || 'flip').split(' '),
        offset = options.offset ? options.offset.split(' ') : [0, 0],
        targetWidth,
        targetHeight,
        basePosition;

    if (options.of.nodeType === 9) {
        targetWidth = target.width();
        targetHeight = target.height();
        basePosition = { top: 0, left: 0 };
    } else if (options.of.scrollTo && options.of.document) {
        targetWidth = target.width();
        targetHeight = target.height();
        basePosition = { top: target.scrollTop(), left: target.scrollLeft() };
    } else if (options.of.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 veritcal positions
    // if a value is missing or invalid, it will be converted to center 
    $.each(['my', 'at'], function() {
        var pos = (options[this] || '').split(' ');
        pos = pos.length == 1
            ? horizontalPositions.test(pos[0])
                ? pos.concat([verticalDefault])
                : verticalPositions.test(pos[0])
                    ? [horizontalDefault].concat(pos)
                    : [horizontalDefault, verticalDefault]
            : pos;
        pos[0] = horizontalPositions.test(pos[0]) ? pos[0] : horizontalDefault;
        pos[1] = verticalPositions.test(pos[1]) ? pos[1] : verticalDefault;
        options[this] = pos;
    });

    // normalize collision option
    if (collision.length == 1) {
        collision[1] = collision[0];
    }

    // normalize offset option
    offset[0] = parseInt(offset[0], 10) || 0;
    if (offset.length == 1) {
        offset[1] = offset[0];
    }
    offset[1] = parseInt(offset[1], 10) || 0;

    switch (options.at[0]) {
        case 'right':
            basePosition.left += targetWidth;
            break;
        case horizontalDefault:
            basePosition.left += targetWidth / 2;
            break;
    }

    switch (options.at[1]) {
        case 'bottom':
            basePosition.top += targetHeight;
            break;
        case verticalDefault:
            basePosition.top += targetHeight / 2;
            break;
    }

    basePosition.left += offset[0];
    basePosition.top += offset[1];

    return this.each(function() {
        var elem = $(this),
            elemWidth = elem.outerWidth(),
            elemHeight = elem.outerHeight(),
            position = $.extend({}, basePosition),
            over,
            myOffset,
            atOffset;

        switch (options.my[0]) {
            case 'right':
                position.left -= elemWidth;
                break;
            case horizontalDefault:
                position.left -= elemWidth / 2;
                break;
        }

        switch (options.my[1]) {
            case 'bottom':
                position.top -= elemHeight;
                break;
            case verticalDefault:
                position.top -= elemHeight / 2;
                break;
        }

        $.each(['left', 'top'], function(i, dir) {
            ($.ui.position[collision[i]] &&
                $.ui.position[collision[i]][dir](position, {
                    targetWidth: targetWidth,
                    targetHeight: targetHeight,
                    elemWidth: elemWidth,
                    elemHeight: elemHeight,
                    offset: offset,
                    my: options.my,
                    at: options.at
                }));
        });

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

$.ui.position = {
    fit: {
        left: function(position, data) {
            var over = position.left + data.elemWidth - $(window).width() - $(window).scrollLeft();
            position.left = over > 0 ? position.left - over : Math.max(0, position.left);
        },
        top: function(position, data) {
            var over = position.top + data.elemHeight - $(window).height() - $(window).scrollTop();
            position.top = over > 0 ? position.top - over : Math.max(0, position.top);
        }
    },

    flip: {
        left: function(position, data) {
            if (data.at[0] == 'center')
                return;
            var over = position.left + data.elemWidth - $(window).width() - $(window).scrollLeft(),
                myOffset = data.my[0] == 'left' ? -data.elemWidth : data.my[0] == 'right' ? data.elemWidth : 0,
                offset = -2 * data.offset[0];
            position.left += position.left < 0 ? myOffset + data.targetWidth + offset : over > 0 ? myOffset - data.targetWidth + offset : 0;
        },
        top: function(position, data) {
            if (data.at[1] == 'center')
                return;
            var over = position.top + data.elemHeight - $(window).height() - $(window).scrollTop(),
                myOffset = data.my[1] == 'top' ? -data.elemHeight : data.my[1] == 'bottom' ? data.elemHeight : 0,
                atOffset = data.at[1] == 'top' ? data.targetHeight : -data.targetHeight,
                offset = -2 * data.offset[1];
            position.top += position.top < 0 ? myOffset + data.targetHeight + offset : over > 0 ? myOffset + atOffset + offset : 0;
        }
    }
};

// offset setter from jQuery 1.4
if (!$.offset.setOffset) {
    $.offset.setOffset = function( elem, options ) {
        // set position first, in-case top/left are set even on static elem
        if ( /static/.test( jQuery.curCSS( elem, 'position' ) ) ) {
            elem.style.position = 'relative';
        }
        var curElem   = jQuery( elem ),
            curOffset = curElem.offset(),
            curTop    = parseInt( jQuery.curCSS( elem, 'top',  true ), 10 ) || 0,
            curLeft   = parseInt( jQuery.curCSS( elem, 'left', true ), 10)  || 0,
            props     = {
                top:  (options.top  - curOffset.top)  + curTop,
                left: (options.left - curOffset.left) + curLeft
            };
        
        if ( 'using' in options ) {
            options.using.call( elem, props );
        } else {
            curElem.css( props );
        }
    };

    var _offset = $.fn.offset;
    $.fn.offset = function( options ) {
        var elem = this[0];
        if ( !elem || !elem.ownerDocument ) { return null; }
        if ( options ) { 
            return this.each(function() {
                $.offset.setOffset( this, options );
            });
        }
        return _offset.call(this);
    };
}

})(jQuery);