1/*
2 * imgAreaSelect jQuery plugin
3 * version 0.9.10-wp-6.2
4 *
5 * Copyright (c) 2008-2013 Michal Wojciechowski (odyniec.net)
6 *
7 * Dual licensed under the MIT (MIT-LICENSE.txt)
8 * and GPL (GPL-LICENSE.txt) licenses.
9 *
10 * https://github.com/odyniec/imgareaselect
11 *
12 */
13
14(function($) {
15
16/*
17 * Math functions will be used extensively, so it's convenient to make a few
18 * shortcuts
19 */
20var abs = Math.abs,
21 max = Math.max,
22 min = Math.min,
23 floor = Math.floor;
24
25/**
26 * Create a new HTML div element
27 *
28 * @return A jQuery object representing the new element
29 */
30function div() {
31 return $('<div/>');
32}
33
34/**
35 * imgAreaSelect initialization
36 *
37 * @param img
38 * A HTML image element to attach the plugin to
39 * @param options
40 * An options object
41 */
42$.imgAreaSelect = function (img, options) {
43 var
44 /* jQuery object representing the image */
45 $img = $(img),
46
47 /* Has the image finished loading? */
48 imgLoaded,
49
50 /* Plugin elements */
51
52 /* Container box */
53 $box = div(),
54 /* Selection area */
55 $area = div(),
56 /* Border (four divs) */
57 $border = div().add(div()).add(div()).add(div()),
58 /* Outer area (four divs) */
59 $outer = div().add(div()).add(div()).add(div()),
60 /* Handles (empty by default, initialized in setOptions()) */
61 $handles = $([]),
62
63 /*
64 * Additional element to work around a cursor problem in Opera
65 * (explained later)
66 */
67 $areaOpera,
68
69 /* Image position (relative to viewport) */
70 left, top,
71
72 /* Image offset (as returned by .offset()) */
73 imgOfs = { left: 0, top: 0 },
74
75 /* Image dimensions (as returned by .width() and .height()) */
76 imgWidth, imgHeight,
77
78 /*
79 * jQuery object representing the parent element that the plugin
80 * elements are appended to
81 */
82 $parent,
83
84 /* Parent element offset (as returned by .offset()) */
85 parOfs = { left: 0, top: 0 },
86
87 /* Base z-index for plugin elements */
88 zIndex = 0,
89
90 /* Plugin elements position */
91 position = 'absolute',
92
93 /* X/Y coordinates of the starting point for move/resize operations */
94 startX, startY,
95
96 /* Horizontal and vertical scaling factors */
97 scaleX, scaleY,
98
99 /* Current resize mode ("nw", "se", etc.) */
100 resize,
101
102 /* Selection area constraints */
103 minWidth, minHeight, maxWidth, maxHeight,
104
105 /* Aspect ratio to maintain (floating point number) */
106 aspectRatio,
107
108 /* Are the plugin elements currently displayed? */
109 shown,
110
111 /* Current selection (relative to parent element) */
112 x1, y1, x2, y2,
113
114 /* Current selection (relative to scaled image) */
115 selection = { x1: 0, y1: 0, x2: 0, y2: 0, width: 0, height: 0 },
116
117 /* Document element */
118 docElem = document.documentElement,
119
120 /* User agent */
121 ua = navigator.userAgent,
122
123 /* Various helper variables used throughout the code */
124 $p, d, i, o, w, h, adjusted;
125
126 /*
127 * Translate selection coordinates (relative to scaled image) to viewport
128 * coordinates (relative to parent element)
129 */
130
131 /**
132 * Translate selection X to viewport X
133 *
134 * @param x
135 * Selection X
136 * @return Viewport X
137 */
138 function viewX(x) {
139 return x + imgOfs.left - parOfs.left;
140 }
141
142 /**
143 * Translate selection Y to viewport Y
144 *
145 * @param y
146 * Selection Y
147 * @return Viewport Y
148 */
149 function viewY(y) {
150 return y + imgOfs.top - parOfs.top;
151 }
152
153 /*
154 * Translate viewport coordinates to selection coordinates
155 */
156
157 /**
158 * Translate viewport X to selection X
159 *
160 * @param x
161 * Viewport X
162 * @return Selection X
163 */
164 function selX(x) {
165 return x - imgOfs.left + parOfs.left;
166 }
167
168 /**
169 * Translate viewport Y to selection Y
170 *
171 * @param y
172 * Viewport Y
173 * @return Selection Y
174 */
175 function selY(y) {
176 return y - imgOfs.top + parOfs.top;
177 }
178
179 /*
180 * Translate event coordinates (relative to document) to viewport
181 * coordinates
182 */
183
184 /**
185 * Get event X and translate it to viewport X
186 *
187 * @param event
188 * The event object
189 * @return Viewport X
190 */
191 function evX(event) {
192 return max(event.pageX || 0, touchCoords(event).x) - parOfs.left;
193 }
194
195 /**
196 * Get event Y and translate it to viewport Y
197 *
198 * @param event
199 * The event object
200 * @return Viewport Y
201 */
202 function evY(event) {
203 return max(event.pageY || 0, touchCoords(event).y) - parOfs.top;
204 }
205
206 /**
207 * Get X and Y coordinates of a touch event
208 *
209 * @param event
210 * The event object
211 * @return Coordinates object
212 */
213 function touchCoords(event) {
214 var oev = event.originalEvent || {};
215
216 if (oev.touches && oev.touches.length)
217 return { x: oev.touches[0].pageX, y: oev.touches[0].pageY };
218 else
219 return { x: 0, y: 0 };
220 }
221
222 /**
223 * Get the current selection
224 *
225 * @param noScale
226 * If set to <code>true</code>, scaling is not applied to the
227 * returned selection
228 * @return Selection object
229 */
230 function getSelection(noScale) {
231 var sx = noScale || scaleX, sy = noScale || scaleY;
232
233 return { x1: floor(selection.x1 * sx),
234 y1: floor(selection.y1 * sy),
235 x2: floor(selection.x2 * sx),
236 y2: floor(selection.y2 * sy),
237 width: floor(selection.x2 * sx) - floor(selection.x1 * sx),
238 height: floor(selection.y2 * sy) - floor(selection.y1 * sy) };
239 }
240
241 /**
242 * Set the current selection
243 *
244 * @param x1
245 * X coordinate of the upper left corner of the selection area
246 * @param y1
247 * Y coordinate of the upper left corner of the selection area
248 * @param x2
249 * X coordinate of the lower right corner of the selection area
250 * @param y2
251 * Y coordinate of the lower right corner of the selection area
252 * @param noScale
253 * If set to <code>true</code>, scaling is not applied to the
254 * new selection
255 */
256 function setSelection(x1, y1, x2, y2, noScale) {
257 var sx = noScale || scaleX, sy = noScale || scaleY;
258
259 selection = {
260 x1: floor(x1 / sx || 0),
261 y1: floor(y1 / sy || 0),
262 x2: floor(x2 / sx || 0),
263 y2: floor(y2 / sy || 0)
264 };
265
266 selection.width = selection.x2 - selection.x1;
267 selection.height = selection.y2 - selection.y1;
268 }
269
270 /**
271 * Recalculate image and parent offsets
272 */
273 function adjust() {
274 /*
275 * Do not adjust if image has not yet loaded or if width is not a
276 * positive number. The latter might happen when imgAreaSelect is put
277 * on a parent element which is then hidden.
278 */
279 if (!imgLoaded || !$img.width())
280 return;
281
282 /*
283 * Get image offset. The .offset() method returns float values, so they
284 * need to be rounded.
285 */
286 imgOfs = { left: floor($img.offset().left), top: floor($img.offset().top) };
287
288 /* Get image dimensions */
289 imgWidth = $img.innerWidth();
290 imgHeight = $img.innerHeight();
291
292 imgOfs.top += ($img.outerHeight() - imgHeight) >> 1;
293 imgOfs.left += ($img.outerWidth() - imgWidth) >> 1;
294
295 /* Set minimum and maximum selection area dimensions */
296 minWidth = floor(options.minWidth / scaleX) || 0;
297 minHeight = floor(options.minHeight / scaleY) || 0;
298 maxWidth = floor(min(options.maxWidth / scaleX || 1<<24, imgWidth));
299 maxHeight = floor(min(options.maxHeight / scaleY || 1<<24, imgHeight));
300
301 /*
302 * Workaround for jQuery 1.3.2 incorrect offset calculation, originally
303 * observed in Safari 3. Firefox 2 is also affected.
304 */
305 if ($().jquery == '1.3.2' && position == 'fixed' &&
306 !docElem['getBoundingClientRect'])
307 {
308 imgOfs.top += max(document.body.scrollTop, docElem.scrollTop);
309 imgOfs.left += max(document.body.scrollLeft, docElem.scrollLeft);
310 }
311
312 /* Determine parent element offset */
313 parOfs = /absolute|relative/.test($parent.css('position')) ?
314 { left: floor($parent.offset().left) - $parent.scrollLeft(),
315 top: floor($parent.offset().top) - $parent.scrollTop() } :
316 position == 'fixed' ?
317 { left: $(document).scrollLeft(), top: $(document).scrollTop() } :
318 { left: 0, top: 0 };
319
320 left = viewX(0);
321 top = viewY(0);
322
323 /*
324 * Check if selection area is within image boundaries, adjust if
325 * necessary
326 */
327 if (selection.x2 > imgWidth || selection.y2 > imgHeight)
328 doResize();
329 }
330
331 /**
332 * Update plugin elements
333 *
334 * @param resetKeyPress
335 * If set to <code>false</code>, this instance's keypress
336 * event handler is not activated
337 */
338 function update(resetKeyPress) {
339 /* If plugin elements are hidden, do nothing */
340 if (!shown) return;
341
342 /*
343 * Set the position and size of the container box and the selection area
344 * inside it
345 */
346 $box.css({ left: viewX(selection.x1), top: viewY(selection.y1) })
347 .add($area).width(w = selection.width).height(h = selection.height);
348
349 /*
350 * Reset the position of selection area, borders, and handles (IE6/IE7
351 * position them incorrectly if we don't do this)
352 */
353 $area.add($border).add($handles).css({ left: 0, top: 0 });
354
355 /* Set border dimensions */
356 $border
357 .width(max(w - $border.outerWidth() + $border.innerWidth(), 0))
358 .height(max(h - $border.outerHeight() + $border.innerHeight(), 0));
359
360 /* Arrange the outer area elements */
361 $($outer[0]).css({ left: left, top: top,
362 width: selection.x1, height: imgHeight });
363 $($outer[1]).css({ left: left + selection.x1, top: top,
364 width: w, height: selection.y1 });
365 $($outer[2]).css({ left: left + selection.x2, top: top,
366 width: imgWidth - selection.x2, height: imgHeight });
367 $($outer[3]).css({ left: left + selection.x1, top: top + selection.y2,
368 width: w, height: imgHeight - selection.y2 });
369
370 w -= $handles.outerWidth();
371 h -= $handles.outerHeight();
372
373 /* Arrange handles */
374 switch ($handles.length) {
375 case 8:
376 $($handles[4]).css({ left: w >> 1 });
377 $($handles[5]).css({ left: w, top: h >> 1 });
378 $($handles[6]).css({ left: w >> 1, top: h });
379 $($handles[7]).css({ top: h >> 1 });
380 case 4:
381 $handles.slice(1,3).css({ left: w });
382 $handles.slice(2,4).css({ top: h });
383 }
384
385 if (resetKeyPress !== false) {
386 /*
387 * Need to reset the document keypress event handler -- unbind the
388 * current handler
389 */
390 if ($.imgAreaSelect.onKeyPress != docKeyPress)
391 $(document).off($.imgAreaSelect.keyPress,
392 $.imgAreaSelect.onKeyPress);
393
394 if (options.keys)
395 /*
396 * Set the document keypress event handler to this instance's
397 * docKeyPress() function
398 */
399 $(document).on( $.imgAreaSelect.keyPress, function() {
400 $.imgAreaSelect.onKeyPress = docKeyPress;
401 });
402 }
403
404 /*
405 * Internet Explorer displays 1px-wide dashed borders incorrectly by
406 * filling the spaces between dashes with white. Toggling the margin
407 * property between 0 and "auto" fixes this in IE6 and IE7 (IE8 is still
408 * broken). This workaround is not perfect, as it requires setTimeout()
409 * and thus causes the border to flicker a bit, but I haven't found a
410 * better solution.
411 *
412 * Note: This only happens with CSS borders, set with the borderWidth,
413 * borderOpacity, borderColor1, and borderColor2 options (which are now
414 * deprecated). Borders created with GIF background images are fine.
415 */
416 if (msie && $border.outerWidth() - $border.innerWidth() == 2) {
417 $border.css('margin', 0);
418 setTimeout(function () { $border.css('margin', 'auto'); }, 0);
419 }
420 }
421
422 /**
423 * Do the complete update sequence: recalculate offsets, update the
424 * elements, and set the correct values of x1, y1, x2, and y2.
425 *
426 * @param resetKeyPress
427 * If set to <code>false</code>, this instance's keypress
428 * event handler is not activated
429 */
430 function doUpdate(resetKeyPress) {
431 adjust();
432 update(resetKeyPress);
433 updateSelectionRelativeToParentElement();
434 }
435
436 /**
437 * Set the correct values of x1, y1, x2, and y2.
438 */
439 function updateSelectionRelativeToParentElement() {
440 x1 = viewX(selection.x1); y1 = viewY(selection.y1);
441 x2 = viewX(selection.x2); y2 = viewY(selection.y2);
442 }
443
444 /**
445 * Hide or fade out an element (or multiple elements)
446 *
447 * @param $elem
448 * A jQuery object containing the element(s) to hide/fade out
449 * @param fn
450 * Callback function to be called when fadeOut() completes
451 */
452 function hide($elem, fn) {
453 options.fadeSpeed ? $elem.fadeOut(options.fadeSpeed, fn) : $elem.hide();
454 }
455
456 /**
457 * Selection area mousemove event handler
458 *
459 * @param event
460 * The event object
461 */
462 function areaMouseMove(event) {
463 var x = selX(evX(event)) - selection.x1,
464 y = selY(evY(event)) - selection.y1;
465
466 if (!adjusted) {
467 adjust();
468 adjusted = true;
469
470 $box.one('mouseout', function () { adjusted = false; });
471 }
472
473 /* Clear the resize mode */
474 resize = '';
475
476 if (options.resizable) {
477 /*
478 * Check if the mouse pointer is over the resize margin area and set
479 * the resize mode accordingly
480 */
481 if (y <= options.resizeMargin)
482 resize = 'n';
483 else if (y >= selection.height - options.resizeMargin)
484 resize = 's';
485 if (x <= options.resizeMargin)
486 resize += 'w';
487 else if (x >= selection.width - options.resizeMargin)
488 resize += 'e';
489 }
490
491 $box.css('cursor', resize ? resize + '-resize' :
492 options.movable ? 'move' : '');
493 if ($areaOpera)
494 $areaOpera.toggle();
495 }
496
497 /**
498 * Document mouseup event handler
499 *
500 * @param event
501 * The event object
502 */
503 function docMouseUp(event) {
504 /* Set back the default cursor */
505 $('body').css('cursor', '');
506 /*
507 * If autoHide is enabled, or if the selection has zero width/height,
508 * hide the selection and the outer area
509 */
510 if (options.autoHide || selection.width * selection.height == 0)
511 hide($box.add($outer), function () { $(this).hide(); });
512
513 $(document).off('mousemove touchmove', selectingMouseMove);
514 $box.on('mousemove touchmove', areaMouseMove);
515
516 options.onSelectEnd(img, getSelection());
517 }
518
519 /**
520 * Selection area mousedown event handler
521 *
522 * @param event
523 * The event object
524 * @return false
525 */
526 function areaMouseDown(event) {
527 if (event.type == 'mousedown' && event.which != 1) return false;
528
529 /*
530 * With mobile browsers, there is no "moving the pointer over" action,
531 * so we need to simulate one mousemove event happening prior to
532 * mousedown/touchstart.
533 */
534 areaMouseMove(event);
535
536 adjust();
537
538 if (resize) {
539 /* Resize mode is in effect */
540 $('body').css('cursor', resize + '-resize');
541
542 x1 = viewX(selection[/w/.test(resize) ? 'x2' : 'x1']);
543 y1 = viewY(selection[/n/.test(resize) ? 'y2' : 'y1']);
544
545 $(document).on('mousemove touchmove', selectingMouseMove)
546 .one('mouseup touchend', docMouseUp);
547 $box.off('mousemove touchmove', areaMouseMove);
548 }
549 else if (options.movable) {
550 startX = left + selection.x1 - evX(event);
551 startY = top + selection.y1 - evY(event);
552
553 $box.off('mousemove touchmove', areaMouseMove);
554
555 $(document).on('mousemove touchmove', movingMouseMove)
556 .one('mouseup touchend', function () {
557 options.onSelectEnd(img, getSelection());
558
559 $(document).off('mousemove touchmove', movingMouseMove);
560 $box.on('mousemove touchmove', areaMouseMove);
561 });
562 }
563 else
564 $img.mousedown(event);
565
566 return false;
567 }
568
569 /**
570 * Adjust the x2/y2 coordinates to maintain aspect ratio (if defined)
571 *
572 * @param xFirst
573 * If set to <code>true</code>, calculate x2 first. Otherwise,
574 * calculate y2 first.
575 */
576 function fixAspectRatio(xFirst) {
577 if (aspectRatio)
578 if (xFirst) {
579 x2 = max(left, min(left + imgWidth,
580 x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1)));
581 y2 = floor(max(top, min(top + imgHeight,
582 y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1))));
583 x2 = floor(x2);
584 }
585 else {
586 y2 = max(top, min(top + imgHeight,
587 y1 + abs(x2 - x1) / aspectRatio * (y2 > y1 || -1)));
588 x2 = floor(max(left, min(left + imgWidth,
589 x1 + abs(y2 - y1) * aspectRatio * (x2 > x1 || -1))));
590 y2 = floor(y2);
591 }
592 }
593
594 /**
595 * Resize the selection area respecting the minimum/maximum dimensions and
596 * aspect ratio
597 */
598 function doResize() {
599 /*
600 * Make sure x1, x2, y1, y2 are initialized to avoid the following calculation
601 * getting incorrect results.
602 */
603 if ( x1 == null || x2 == null || y1 == null || y2 == null ) {
604 updateSelectionRelativeToParentElement();
605 }
606
607 /*
608 * Make sure the top left corner of the selection area stays within
609 * image boundaries (it might not if the image source was dynamically
610 * changed).
611 */
612 x1 = min(x1, left + imgWidth);
613 y1 = min(y1, top + imgHeight);
614
615 if (abs(x2 - x1) < minWidth) {
616 /* Selection width is smaller than minWidth */
617 x2 = x1 - minWidth * (x2 < x1 || -1);
618
619 if (x2 < left)
620 x1 = left + minWidth;
621 else if (x2 > left + imgWidth)
622 x1 = left + imgWidth - minWidth;
623 }
624
625 if (abs(y2 - y1) < minHeight) {
626 /* Selection height is smaller than minHeight */
627 y2 = y1 - minHeight * (y2 < y1 || -1);
628
629 if (y2 < top)
630 y1 = top + minHeight;
631 else if (y2 > top + imgHeight)
632 y1 = top + imgHeight - minHeight;
633 }
634
635 x2 = max(left, min(x2, left + imgWidth));
636 y2 = max(top, min(y2, top + imgHeight));
637
638 fixAspectRatio(abs(x2 - x1) < abs(y2 - y1) * aspectRatio);
639
640 if (abs(x2 - x1) > maxWidth) {
641 /* Selection width is greater than maxWidth */
642 x2 = x1 - maxWidth * (x2 < x1 || -1);
643 fixAspectRatio();
644 }
645
646 if (abs(y2 - y1) > maxHeight) {
647 /* Selection height is greater than maxHeight */
648 y2 = y1 - maxHeight * (y2 < y1 || -1);
649 fixAspectRatio(true);
650 }
651
652 selection = { x1: selX(min(x1, x2)), x2: selX(max(x1, x2)),
653 y1: selY(min(y1, y2)), y2: selY(max(y1, y2)),
654 width: abs(x2 - x1), height: abs(y2 - y1) };
655
656 update();
657
658 options.onSelectChange(img, getSelection());
659 }
660
661 /**
662 * Mousemove event handler triggered when the user is selecting an area
663 *
664 * @param event
665 * The event object
666 * @return false
667 */
668 function selectingMouseMove(event) {
669 x2 = /w|e|^$/.test(resize) || aspectRatio ? evX(event) : viewX(selection.x2);
670 y2 = /n|s|^$/.test(resize) || aspectRatio ? evY(event) : viewY(selection.y2);
671
672 doResize();
673
674 return false;
675 }
676
677 /**
678 * Move the selection area
679 *
680 * @param newX1
681 * New viewport X1
682 * @param newY1
683 * New viewport Y1
684 */
685 function doMove(newX1, newY1) {
686 x2 = (x1 = newX1) + selection.width;
687 y2 = (y1 = newY1) + selection.height;
688
689 $.extend(selection, { x1: selX(x1), y1: selY(y1), x2: selX(x2),
690 y2: selY(y2) });
691
692 update();
693
694 options.onSelectChange(img, getSelection());
695 }
696
697 /**
698 * Mousemove event handler triggered when the selection area is being moved
699 *
700 * @param event
701 * The event object
702 * @return false
703 */
704 function movingMouseMove(event) {
705 x1 = max(left, min(startX + evX(event), left + imgWidth - selection.width));
706 y1 = max(top, min(startY + evY(event), top + imgHeight - selection.height));
707
708 doMove(x1, y1);
709
710 event.preventDefault();
711 return false;
712 }
713
714 /**
715 * Start selection
716 */
717 function startSelection() {
718 $(document).off('mousemove touchmove', startSelection);
719 adjust();
720
721 x2 = x1;
722 y2 = y1;
723 doResize();
724
725 resize = '';
726
727 if (!$outer.is(':visible'))
728 /* Show the plugin elements */
729 $box.add($outer).hide().fadeIn(options.fadeSpeed||0);
730
731 shown = true;
732
733 $(document).off('mouseup touchend', cancelSelection)
734 .on('mousemove touchmove', selectingMouseMove)
735 .one('mouseup touchend', docMouseUp);
736 $box.off('mousemove touchmove', areaMouseMove);
737
738 options.onSelectStart(img, getSelection());
739 }
740
741 /**
742 * Cancel selection
743 */
744 function cancelSelection() {
745 $(document).off('mousemove touchmove', startSelection)
746 .off('mouseup touchend', cancelSelection);
747 hide($box.add($outer));
748
749 setSelection(selX(x1), selY(y1), selX(x1), selY(y1));
750
751 /* If this is an API call, callback functions should not be triggered */
752 if (!(this instanceof $.imgAreaSelect)) {
753 options.onSelectChange(img, getSelection());
754 options.onSelectEnd(img, getSelection());
755 }
756 }
757
758 /**
759 * Image mousedown event handler
760 *
761 * @param event
762 * The event object
763 * @return false
764 */
765 function imgMouseDown(event) {
766 /* Ignore the event if animation is in progress */
767 if (event.which > 1 || $outer.is(':animated')) return false;
768
769 adjust();
770 startX = x1 = evX(event);
771 startY = y1 = evY(event);
772
773 /* Selection will start when the mouse is moved */
774 $(document).on({ 'mousemove touchmove': startSelection,
775 'mouseup touchend': cancelSelection });
776
777 return false;
778 }
779
780 /**
781 * Window resize event handler
782 */
783 function windowResize() {
784 doUpdate(false);
785 }
786
787 /**
788 * Image load event handler. This is the final part of the initialization
789 * process.
790 */
791 function imgLoad() {
792 imgLoaded = true;
793
794 /* Set options */
795 setOptions(options = $.extend({
796 classPrefix: 'imgareaselect',
797 movable: true,
798 parent: 'body',
799 resizable: true,
800 resizeMargin: 10,
801 onInit: function () {},
802 onSelectStart: function () {},
803 onSelectChange: function () {},
804 onSelectEnd: function () {}
805 }, options));
806
807 $box.add($outer).css({ visibility: '' });
808
809 if (options.show) {
810 shown = true;
811 adjust();
812 update();
813 $box.add($outer).hide().fadeIn(options.fadeSpeed||0);
814 }
815
816 /*
817 * Call the onInit callback. The setTimeout() call is used to ensure
818 * that the plugin has been fully initialized and the object instance is
819 * available (so that it can be obtained in the callback).
820 */
821 setTimeout(function () { options.onInit(img, getSelection()); }, 0);
822 }
823
824 /**
825 * Document keypress event handler
826 *
827 * @param event
828 * The event object
829 * @return false
830 */
831 var docKeyPress = function(event) {
832 var k = options.keys, d, t, key = event.keyCode;
833
834 d = !isNaN(k.alt) && (event.altKey || event.originalEvent.altKey) ? k.alt :
835 !isNaN(k.ctrl) && event.ctrlKey ? k.ctrl :
836 !isNaN(k.shift) && event.shiftKey ? k.shift :
837 !isNaN(k.arrows) ? k.arrows : 10;
838
839 if (k.arrows == 'resize' || (k.shift == 'resize' && event.shiftKey) ||
840 (k.ctrl == 'resize' && event.ctrlKey) ||
841 (k.alt == 'resize' && (event.altKey || event.originalEvent.altKey)))
842 {
843 /* Resize selection */
844
845 switch (key) {
846 case 37:
847 /* Left */
848 d = -d;
849 case 39:
850 /* Right */
851 t = max(x1, x2);
852 x1 = min(x1, x2);
853 x2 = max(t + d, x1);
854 fixAspectRatio();
855 break;
856 case 38:
857 /* Up */
858 d = -d;
859 case 40:
860 /* Down */
861 t = max(y1, y2);
862 y1 = min(y1, y2);
863 y2 = max(t + d, y1);
864 fixAspectRatio(true);
865 break;
866 default:
867 return;
868 }
869
870 doResize();
871 }
872 else {
873 /* Move selection */
874
875 x1 = min(x1, x2);
876 y1 = min(y1, y2);
877
878 switch (key) {
879 case 37:
880 /* Left */
881 doMove(max(x1 - d, left), y1);
882 break;
883 case 38:
884 /* Up */
885 doMove(x1, max(y1 - d, top));
886 break;
887 case 39:
888 /* Right */
889 doMove(x1 + min(d, imgWidth - selX(x2)), y1);
890 break;
891 case 40:
892 /* Down */
893 doMove(x1, y1 + min(d, imgHeight - selY(y2)));
894 break;
895 default:
896 return;
897 }
898 }
899
900 return false;
901 };
902
903 /**
904 * Apply style options to plugin element (or multiple elements)
905 *
906 * @param $elem
907 * A jQuery object representing the element(s) to style
908 * @param props
909 * An object that maps option names to corresponding CSS
910 * properties
911 */
912 function styleOptions($elem, props) {
913 for (var option in props)
914 if (options[option] !== undefined)
915 $elem.css(props[option], options[option]);
916 }
917
918 /**
919 * Set plugin options
920 *
921 * @param newOptions
922 * The new options object
923 */
924 function setOptions(newOptions) {
925 if (newOptions.parent)
926 ($parent = $(newOptions.parent)).append($box.add($outer));
927
928 /* Merge the new options with the existing ones */
929 $.extend(options, newOptions);
930
931 adjust();
932
933 if (newOptions.handles != null) {
934 /* Recreate selection area handles */
935 $handles.remove();
936 $handles = $([]);
937
938 i = newOptions.handles ? newOptions.handles == 'corners' ? 4 : 8 : 0;
939
940 while (i--)
941 $handles = $handles.add(div());
942
943 /* Add a class to handles and set the CSS properties */
944 $handles.addClass(options.classPrefix + '-handle').css({
945 position: 'absolute',
946 /*
947 * The font-size property needs to be set to zero, otherwise
948 * Internet Explorer makes the handles too large
949 */
950 fontSize: '0',
951 zIndex: zIndex + 1 || 1
952 });
953
954 /*
955 * If handle width/height has not been set with CSS rules, set the
956 * default 5px
957 */
958 if (!parseInt($handles.css('width')) >= 0)
959 $handles.width(10).height(10);
960
961 /*
962 * If the borderWidth option is in use, add a solid border to
963 * handles
964 */
965 if (o = options.borderWidth)
966 $handles.css({ borderWidth: o, borderStyle: 'solid' });
967
968 /* Apply other style options */
969 styleOptions($handles, { borderColor1: 'border-color',
970 borderColor2: 'background-color',
971 borderOpacity: 'opacity' });
972 }
973
974 /* Calculate scale factors */
975 scaleX = options.imageWidth / imgWidth || 1;
976 scaleY = options.imageHeight / imgHeight || 1;
977
978 /* Set selection */
979 if (newOptions.x1 != null) {
980 setSelection(newOptions.x1, newOptions.y1, newOptions.x2,
981 newOptions.y2);
982 newOptions.show = !newOptions.hide;
983 }
984
985 if (newOptions.keys)
986 /* Enable keyboard support */
987 options.keys = $.extend({ shift: 1, ctrl: 'resize' },
988 newOptions.keys);
989
990 /* Add classes to plugin elements */
991 $outer.addClass(options.classPrefix + '-outer');
992 $area.addClass(options.classPrefix + '-selection');
993 for (i = 0; i++ < 4;)
994 $($border[i-1]).addClass(options.classPrefix + '-border' + i);
995
996 /* Apply style options */
997 styleOptions($area, { selectionColor: 'background-color',
998 selectionOpacity: 'opacity' });
999 styleOptions($border, { borderOpacity: 'opacity',
1000 borderWidth: 'border-width' });
1001 styleOptions($outer, { outerColor: 'background-color',
1002 outerOpacity: 'opacity' });
1003 if (o = options.borderColor1)
1004 $($border[0]).css({ borderStyle: 'solid', borderColor: o });
1005 if (o = options.borderColor2)
1006 $($border[1]).css({ borderStyle: 'dashed', borderColor: o });
1007
1008 /* Append all the selection area elements to the container box */
1009 $box.append($area.add($border).add($areaOpera)).append($handles);
1010
1011 if (msie) {
1012 if (o = ($outer.css('filter')||'').match(/opacity=(\d+)/))
1013 $outer.css('opacity', o[1]/100);
1014 if (o = ($border.css('filter')||'').match(/opacity=(\d+)/))
1015 $border.css('opacity', o[1]/100);
1016 }
1017
1018 if (newOptions.hide)
1019 hide($box.add($outer));
1020 else if (newOptions.show && imgLoaded) {
1021 shown = true;
1022 $box.add($outer).fadeIn(options.fadeSpeed||0);
1023 doUpdate();
1024 }
1025
1026 /* Calculate the aspect ratio factor */
1027 aspectRatio = (d = (options.aspectRatio || '').split(/:/))[0] / d[1];
1028
1029 $img.add($outer).off('mousedown', imgMouseDown);
1030
1031 if (options.disable || options.enable === false) {
1032 /* Disable the plugin */
1033 $box.off({ 'mousemove touchmove': areaMouseMove,
1034 'mousedown touchstart': areaMouseDown });
1035 $(window).off('resize', windowResize);
1036 }
1037 else {
1038 if (options.enable || options.disable === false) {
1039 /* Enable the plugin */
1040 if (options.resizable || options.movable)
1041 $box.on({ 'mousemove touchmove': areaMouseMove,
1042 'mousedown touchstart': areaMouseDown });
1043
1044 $(window).on( 'resize', windowResize);
1045 }
1046
1047 if (!options.persistent)
1048 $img.add($outer).on('mousedown touchstart', imgMouseDown);
1049 }
1050
1051 options.enable = options.disable = undefined;
1052 }
1053
1054 /**
1055 * Remove plugin completely
1056 */
1057 this.remove = function () {
1058 /*
1059 * Call setOptions with { disable: true } to unbind the event handlers
1060 */
1061 setOptions({ disable: true });
1062 $box.add($outer).remove();
1063 };
1064
1065 /*
1066 * Public API
1067 */
1068
1069 /**
1070 * Get current options
1071 *
1072 * @return An object containing the set of options currently in use
1073 */
1074 this.getOptions = function () { return options; };
1075
1076 /**
1077 * Set plugin options
1078 *
1079 * @param newOptions
1080 * The new options object
1081 */
1082 this.setOptions = setOptions;
1083
1084 /**
1085 * Get the current selection
1086 *
1087 * @param noScale
1088 * If set to <code>true</code>, scaling is not applied to the
1089 * returned selection
1090 * @return Selection object
1091 */
1092 this.getSelection = getSelection;
1093
1094 /**
1095 * Set the current selection
1096 *
1097 * @param x1
1098 * X coordinate of the upper left corner of the selection area
1099 * @param y1
1100 * Y coordinate of the upper left corner of the selection area
1101 * @param x2
1102 * X coordinate of the lower right corner of the selection area
1103 * @param y2
1104 * Y coordinate of the lower right corner of the selection area
1105 * @param noScale
1106 * If set to <code>true</code>, scaling is not applied to the
1107 * new selection
1108 */
1109 this.setSelection = setSelection;
1110
1111 /**
1112 * Cancel selection
1113 */
1114 this.cancelSelection = cancelSelection;
1115
1116 /**
1117 * Update plugin elements
1118 *
1119 * @param resetKeyPress
1120 * If set to <code>false</code>, this instance's keypress
1121 * event handler is not activated
1122 */
1123 this.update = doUpdate;
1124
1125 /* Do the dreaded browser detection */
1126 var msie = (/msie ([\w.]+)/i.exec(ua)||[])[1],
1127 opera = /opera/i.test(ua),
1128 safari = /webkit/i.test(ua) && !/chrome/i.test(ua);
1129
1130 /*
1131 * Traverse the image's parent elements (up to <body>) and find the
1132 * highest z-index
1133 */
1134 $p = $img;
1135
1136 while ($p.length) {
1137 zIndex = max(zIndex,
1138 !isNaN($p.css('z-index')) ? $p.css('z-index') : zIndex);
1139 /* Also check if any of the ancestor elements has fixed position */
1140 if ($p.css('position') == 'fixed')
1141 position = 'fixed';
1142
1143 $p = $p.parent(':not(body)');
1144 }
1145
1146 /*
1147 * If z-index is given as an option, it overrides the one found by the
1148 * above loop
1149 */
1150 zIndex = options.zIndex || zIndex;
1151
1152 if (msie)
1153 $img.attr('unselectable', 'on');
1154
1155 /*
1156 * In MSIE and WebKit, we need to use the keydown event instead of keypress
1157 */
1158 $.imgAreaSelect.keyPress = msie || safari ? 'keydown' : 'keypress';
1159
1160 /*
1161 * There is a bug affecting the CSS cursor property in Opera (observed in
1162 * versions up to 10.00) that prevents the cursor from being updated unless
1163 * the mouse leaves and enters the element again. To trigger the mouseover
1164 * event, we're adding an additional div to $box and we're going to toggle
1165 * it when mouse moves inside the selection area.
1166 */
1167 if (opera)
1168 $areaOpera = div().css({ width: '100%', height: '100%',
1169 position: 'absolute', zIndex: zIndex + 2 || 2 });
1170
1171 /*
1172 * We initially set visibility to "hidden" as a workaround for a weird
1173 * behaviour observed in Google Chrome 1.0.154.53 (on Windows XP). Normally
1174 * we would just set display to "none", but, for some reason, if we do so
1175 * then Chrome refuses to later display the element with .show() or
1176 * .fadeIn().
1177 */
1178 $box.add($outer).css({ visibility: 'hidden', position: position,
1179 overflow: 'hidden', zIndex: zIndex || '0' });
1180 $box.css({ zIndex: zIndex + 2 || 2 });
1181 $area.add($border).css({ position: 'absolute', fontSize: '0' });
1182
1183 /*
1184 * If the image has been fully loaded, or if it is not really an image (eg.
1185 * a div), call imgLoad() immediately; otherwise, bind it to be called once
1186 * on image load event.
1187 */
1188 img.complete || img.readyState == 'complete' || !$img.is('img') ?
1189 imgLoad() : $img.one('load', imgLoad);
1190
1191 /*
1192 * MSIE 9.0 doesn't always fire the image load event -- resetting the src
1193 * attribute seems to trigger it. The check is for version 7 and above to
1194 * accommodate for MSIE 9 running in compatibility mode.
1195 */
1196 if (!imgLoaded && msie && msie >= 7)
1197 img.src = img.src;
1198};
1199
1200/**
1201 * Invoke imgAreaSelect on a jQuery object containing the image(s)
1202 *
1203 * @param options
1204 * Options object
1205 * @return The jQuery object or a reference to imgAreaSelect instance (if the
1206 * <code>instance</code> option was specified)
1207 */
1208$.fn.imgAreaSelect = function (options) {
1209 options = options || {};
1210
1211 this.each(function () {
1212 /* Is there already an imgAreaSelect instance bound to this element? */
1213 if ($(this).data('imgAreaSelect')) {
1214 /* Yes there is -- is it supposed to be removed? */
1215 if (options.remove) {
1216 /* Remove the plugin */
1217 $(this).data('imgAreaSelect').remove();
1218 $(this).removeData('imgAreaSelect');
1219 }
1220 else
1221 /* Reset options */
1222 $(this).data('imgAreaSelect').setOptions(options);
1223 }
1224 else if (!options.remove) {
1225 /* No exising instance -- create a new one */
1226
1227 /*
1228 * If neither the "enable" nor the "disable" option is present, add
1229 * "enable" as the default
1230 */
1231 if (options.enable === undefined && options.disable === undefined)
1232 options.enable = true;
1233
1234 $(this).data('imgAreaSelect', new $.imgAreaSelect(this, options));
1235 }
1236 });
1237
1238 if (options.instance)
1239 /*
1240 * Return the imgAreaSelect instance bound to the first element in the
1241 * set
1242 */
1243 return $(this).data('imgAreaSelect');
1244
1245 return this;
1246};
1247
1248})(jQuery);
1249