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/*
* jQuery UI Position @VERSION
*
* Copyright (c) 2009 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);
}
options = $.extend({}, $.ui.position.defaults, options);
var target = $(options.of),
collision = (options.collision || 'flip').split(' '),
offset = options.offset ? options.offset.split(' ') : [0, 0],
targetWidth,
targetHeight,
basePosition;
if (options.of == document) {
targetWidth = target.width();
targetHeight = target.height();
basePosition = { top: 0, left: 0 };
} else if (options.of == window) {
targetWidth = target.width();
targetHeight = target.height();
basePosition = { top: target.scrollTop(), left: target.scrollLeft() };
} else if (options.of.preventDefault) {
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
}));
});
(options.stackfix && $.fn.stackfix && elem.stackfix());
// the by function is passed the offset values, not the position values
// we'll need the logic from the .offset() setter to be accessible for
// us to calculate the position values to make the by option more useful
($.isFunction(options.by) ? options.by.call(this, position) : elem.offset(position));
});
};
$.ui.position = {
defaults:{
stackFix: true
},
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;
}
}
};
// the following functionality is planned for jQuery 1.4
// based on http://plugins.jquery.com/files/offset.js.txt
$.fn.extend({
_offset: $.fn.offset,
offset: function(newOffset) {
return !newOffset ? this._offset() : this.each(function() {
var elem = $(this),
// we need to convert static positioning to relative positioning
isRelative = /relative|static/.test(elem.css('position')),
hide = elem.css('display') == 'none';
(isRelative && elem.css('position', 'relative'));
(hide && elem.show());
var offset = elem.offset(),
delta = {
left : parseInt(elem.css('left'), 10),
top: parseInt(elem.css('top'), 10)
};
// in case of 'auto'
delta.left = !isNaN(delta.left)
? delta.left
: isRelative
? 0
: this.offsetLeft;
delta.top = !isNaN(delta.top)
? delta.top
: isRelative
? 0
: this.offsetTop;
// allow setting only left or only top
if (newOffset.left || newOffset.left === 0) {
elem.css('left', newOffset.left - offset.left + delta.left);
}
if (newOffset.top || newOffset.top === 0) {
elem.css('top', newOffset.top - offset.top + delta.top);
}
(hide && elem.hide());
});
}
});
})(jQuery);
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