jquery-ui/ui/jquery.ui.position.js at 90fb45dffafc2e891b1ebca948ad33e6b94de112 · ainformatico/jquery-ui · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*
 * 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);
	}

	// 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
				}));
		});

		(options.stackfix !== false && $.fn.stackfix && elem.stackfix());
		elem.offset($.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);