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1 /*
2 Copyright (c) 2007, Yahoo! Inc. All rights reserved.
3 Code licensed under the BSD License:
4 http://developer.yahoo.net/yui/license.txt
5 version: 2.3.0
6 */
7 /**
8 * The drag and drop utility provides a framework for building drag and drop
9 * applications. In addition to enabling drag and drop for specific elements,
10 * the drag and drop elements are tracked by the manager class, and the
11 * interactions between the various elements are tracked during the drag and
12 * the implementing code is notified about these important moments.
13 * @module dragdrop
14 * @title Drag and Drop
15 * @requires yahoo,dom,event
16 * @namespace YAHOO.util
17 */
19 // Only load the library once. Rewriting the manager class would orphan
20 // existing drag and drop instances.
21 if (!YAHOO.util.DragDropMgr) {
23 /**
24 * DragDropMgr is a singleton that tracks the element interaction for
25 * all DragDrop items in the window. Generally, you will not call
26 * this class directly, but it does have helper methods that could
27 * be useful in your DragDrop implementations.
28 * @class DragDropMgr
29 * @static
30 */
31 YAHOO.util.DragDropMgr = function() {
33 var Event = YAHOO.util.Event;
35 return {
37 /**
38 * Two dimensional Array of registered DragDrop objects. The first
39 * dimension is the DragDrop item group, the second the DragDrop
40 * object.
41 * @property ids
42 * @type {string: string}
43 * @private
44 * @static
45 */
46 ids: {},
48 /**
49 * Array of element ids defined as drag handles. Used to determine
50 * if the element that generated the mousedown event is actually the
51 * handle and not the html element itself.
52 * @property handleIds
53 * @type {string: string}
54 * @private
55 * @static
56 */
57 handleIds: {},
59 /**
60 * the DragDrop object that is currently being dragged
61 * @property dragCurrent
62 * @type DragDrop
63 * @private
64 * @static
65 **/
66 dragCurrent: null,
68 /**
69 * the DragDrop object(s) that are being hovered over
70 * @property dragOvers
71 * @type Array
72 * @private
73 * @static
74 */
75 dragOvers: {},
77 /**
78 * the X distance between the cursor and the object being dragged
79 * @property deltaX
80 * @type int
81 * @private
82 * @static
83 */
84 deltaX: 0,
86 /**
87 * the Y distance between the cursor and the object being dragged
88 * @property deltaY
89 * @type int
90 * @private
91 * @static
92 */
93 deltaY: 0,
95 /**
96 * Flag to determine if we should prevent the default behavior of the
97 * events we define. By default this is true, but this can be set to
98 * false if you need the default behavior (not recommended)
99 * @property preventDefault
100 * @type boolean
101 * @static
102 */
103 preventDefault: true,
105 /**
106 * Flag to determine if we should stop the propagation of the events
107 * we generate. This is true by default but you may want to set it to
108 * false if the html element contains other features that require the
109 * mouse click.
110 * @property stopPropagation
111 * @type boolean
112 * @static
113 */
114 stopPropagation: true,
116 /**
117 * Internal flag that is set to true when drag and drop has been
118 * initialized
119 * @property initialized
120 * @private
121 * @static
122 */
123 initialized: false,
125 /**
126 * All drag and drop can be disabled.
127 * @property locked
128 * @private
129 * @static
130 */
131 locked: false,
133 /**
134 * Provides additional information about the the current set of
135 * interactions. Can be accessed from the event handlers. It
136 * contains the following properties:
137 *
138 * out: onDragOut interactions
139 * enter: onDragEnter interactions
140 * over: onDragOver interactions
141 * drop: onDragDrop interactions
142 * point: The location of the cursor
143 * draggedRegion: The location of dragged element at the time
144 * of the interaction
145 * sourceRegion: The location of the source elemtn at the time
146 * of the interaction
147 * validDrop: boolean
148 * @property interactionInfo
149 * @type object
150 * @static
151 */
152 interactionInfo: null,
154 /**
155 * Called the first time an element is registered.
156 * @method init
157 * @private
158 * @static
159 */
160 init: function() {
161 this.initialized = true;
162 },
164 /**
165 * In point mode, drag and drop interaction is defined by the
166 * location of the cursor during the drag/drop
167 * @property POINT
168 * @type int
169 * @static
170 * @final
171 */
172 POINT: 0,
174 /**
175 * In intersect mode, drag and drop interaction is defined by the
176 * cursor position or the amount of overlap of two or more drag and
177 * drop objects.
178 * @property INTERSECT
179 * @type int
180 * @static
181 * @final
182 */
183 INTERSECT: 1,
185 /**
186 * In intersect mode, drag and drop interaction is defined only by the
187 * overlap of two or more drag and drop objects.
188 * @property STRICT_INTERSECT
189 * @type int
190 * @static
191 * @final
192 */
193 STRICT_INTERSECT: 2,
195 /**
196 * The current drag and drop mode. Default: POINT
197 * @property mode
198 * @type int
199 * @static
200 */
201 mode: 0,
203 /**
204 * Runs method on all drag and drop objects
205 * @method _execOnAll
206 * @private
207 * @static
208 */
209 _execOnAll: function(sMethod, args) {
210 for (var i in this.ids) {
211 for (var j in this.ids[i]) {
212 var oDD = this.ids[i][j];
213 if (! this.isTypeOfDD(oDD)) {
214 continue;
215 }
216 oDD[sMethod].apply(oDD, args);
217 }
218 }
219 },
221 /**
222 * Drag and drop initialization. Sets up the global event handlers
223 * @method _onLoad
224 * @private
225 * @static
226 */
227 _onLoad: function() {
229 this.init();
231 YAHOO.log("DragDropMgr onload", "info", "DragDropMgr");
233 Event.on(document, "mouseup", this.handleMouseUp, this, true);
234 Event.on(document, "mousemove", this.handleMouseMove, this, true);
235 Event.on(window, "unload", this._onUnload, this, true);
236 Event.on(window, "resize", this._onResize, this, true);
237 // Event.on(window, "mouseout", this._test);
239 },
241 /**
242 * Reset constraints on all drag and drop objs
243 * @method _onResize
244 * @private
245 * @static
246 */
247 _onResize: function(e) {
248 YAHOO.log("window resize", "info", "DragDropMgr");
249 this._execOnAll("resetConstraints", []);
250 },
252 /**
253 * Lock all drag and drop functionality
254 * @method lock
255 * @static
256 */
257 lock: function() { this.locked = true; },
259 /**
260 * Unlock all drag and drop functionality
261 * @method unlock
262 * @static
263 */
264 unlock: function() { this.locked = false; },
266 /**
267 * Is drag and drop locked?
268 * @method isLocked
269 * @return {boolean} True if drag and drop is locked, false otherwise.
270 * @static
271 */
272 isLocked: function() { return this.locked; },
274 /**
275 * Location cache that is set for all drag drop objects when a drag is
276 * initiated, cleared when the drag is finished.
277 * @property locationCache
278 * @private
279 * @static
280 */
281 locationCache: {},
283 /**
284 * Set useCache to false if you want to force object the lookup of each
285 * drag and drop linked element constantly during a drag.
286 * @property useCache
287 * @type boolean
288 * @static
289 */
290 useCache: true,
292 /**
293 * The number of pixels that the mouse needs to move after the
294 * mousedown before the drag is initiated. Default=3;
295 * @property clickPixelThresh
296 * @type int
297 * @static
298 */
299 clickPixelThresh: 3,
301 /**
302 * The number of milliseconds after the mousedown event to initiate the
303 * drag if we don't get a mouseup event. Default=1000
304 * @property clickTimeThresh
305 * @type int
306 * @static
307 */
308 clickTimeThresh: 1000,
310 /**
311 * Flag that indicates that either the drag pixel threshold or the
312 * mousdown time threshold has been met
313 * @property dragThreshMet
314 * @type boolean
315 * @private
316 * @static
317 */
318 dragThreshMet: false,
320 /**
321 * Timeout used for the click time threshold
322 * @property clickTimeout
323 * @type Object
324 * @private
325 * @static
326 */
327 clickTimeout: null,
329 /**
330 * The X position of the mousedown event stored for later use when a
331 * drag threshold is met.
332 * @property startX
333 * @type int
334 * @private
335 * @static
336 */
337 startX: 0,
339 /**
340 * The Y position of the mousedown event stored for later use when a
341 * drag threshold is met.
342 * @property startY
343 * @type int
344 * @private
345 * @static
346 */
347 startY: 0,
349 /**
350 * Each DragDrop instance must be registered with the DragDropMgr.
351 * This is executed in DragDrop.init()
352 * @method regDragDrop
353 * @param {DragDrop} oDD the DragDrop object to register
354 * @param {String} sGroup the name of the group this element belongs to
355 * @static
356 */
357 regDragDrop: function(oDD, sGroup) {
358 if (!this.initialized) { this.init(); }
360 if (!this.ids[sGroup]) {
361 this.ids[sGroup] = {};
362 }
363 this.ids[sGroup][oDD.id] = oDD;
364 },
366 /**
367 * Removes the supplied dd instance from the supplied group. Executed
368 * by DragDrop.removeFromGroup, so don't call this function directly.
369 * @method removeDDFromGroup
370 * @private
371 * @static
372 */
373 removeDDFromGroup: function(oDD, sGroup) {
374 if (!this.ids[sGroup]) {
375 this.ids[sGroup] = {};
376 }
378 var obj = this.ids[sGroup];
379 if (obj && obj[oDD.id]) {
380 delete obj[oDD.id];
381 }
382 },
384 /**
385 * Unregisters a drag and drop item. This is executed in
386 * DragDrop.unreg, use that method instead of calling this directly.
387 * @method _remove
388 * @private
389 * @static
390 */
391 _remove: function(oDD) {
392 for (var g in oDD.groups) {
393 if (g && this.ids[g][oDD.id]) {
394 delete this.ids[g][oDD.id];
395 //YAHOO.log("NEW LEN " + this.ids.length, "warn");
396 }
397 }
398 delete this.handleIds[oDD.id];
399 },
401 /**
402 * Each DragDrop handle element must be registered. This is done
403 * automatically when executing DragDrop.setHandleElId()
404 * @method regHandle
405 * @param {String} sDDId the DragDrop id this element is a handle for
406 * @param {String} sHandleId the id of the element that is the drag
407 * handle
408 * @static
409 */
410 regHandle: function(sDDId, sHandleId) {
411 if (!this.handleIds[sDDId]) {
412 this.handleIds[sDDId] = {};
413 }
414 this.handleIds[sDDId][sHandleId] = sHandleId;
415 },
417 /**
418 * Utility function to determine if a given element has been
419 * registered as a drag drop item.
420 * @method isDragDrop
421 * @param {String} id the element id to check
422 * @return {boolean} true if this element is a DragDrop item,
423 * false otherwise
424 * @static
425 */
426 isDragDrop: function(id) {
427 return ( this.getDDById(id) ) ? true : false;
428 },
430 /**
431 * Returns the drag and drop instances that are in all groups the
432 * passed in instance belongs to.
433 * @method getRelated
434 * @param {DragDrop} p_oDD the obj to get related data for
435 * @param {boolean} bTargetsOnly if true, only return targetable objs
436 * @return {DragDrop[]} the related instances
437 * @static
438 */
439 getRelated: function(p_oDD, bTargetsOnly) {
440 var oDDs = [];
441 for (var i in p_oDD.groups) {
442 for (j in this.ids[i]) {
443 var dd = this.ids[i][j];
444 if (! this.isTypeOfDD(dd)) {
445 continue;
446 }
447 if (!bTargetsOnly || dd.isTarget) {
448 oDDs[oDDs.length] = dd;
449 }
450 }
451 }
453 return oDDs;
454 },
456 /**
457 * Returns true if the specified dd target is a legal target for
458 * the specifice drag obj
459 * @method isLegalTarget
460 * @param {DragDrop} the drag obj
461 * @param {DragDrop} the target
462 * @return {boolean} true if the target is a legal target for the
463 * dd obj
464 * @static
465 */
466 isLegalTarget: function (oDD, oTargetDD) {
467 var targets = this.getRelated(oDD, true);
468 for (var i=0, len=targets.length;i<len;++i) {
469 if (targets[i].id == oTargetDD.id) {
470 return true;
471 }
472 }
474 return false;
475 },
477 /**
478 * My goal is to be able to transparently determine if an object is
479 * typeof DragDrop, and the exact subclass of DragDrop. typeof
480 * returns "object", oDD.constructor.toString() always returns
481 * "DragDrop" and not the name of the subclass. So for now it just
482 * evaluates a well-known variable in DragDrop.
483 * @method isTypeOfDD
484 * @param {Object} the object to evaluate
485 * @return {boolean} true if typeof oDD = DragDrop
486 * @static
487 */
488 isTypeOfDD: function (oDD) {
489 return (oDD && oDD.__ygDragDrop);
490 },
492 /**
493 * Utility function to determine if a given element has been
494 * registered as a drag drop handle for the given Drag Drop object.
495 * @method isHandle
496 * @param {String} id the element id to check
497 * @return {boolean} true if this element is a DragDrop handle, false
498 * otherwise
499 * @static
500 */
501 isHandle: function(sDDId, sHandleId) {
502 return ( this.handleIds[sDDId] &&
503 this.handleIds[sDDId][sHandleId] );
504 },
506 /**
507 * Returns the DragDrop instance for a given id
508 * @method getDDById
509 * @param {String} id the id of the DragDrop object
510 * @return {DragDrop} the drag drop object, null if it is not found
511 * @static
512 */
513 getDDById: function(id) {
514 for (var i in this.ids) {
515 if (this.ids[i][id]) {
516 return this.ids[i][id];
517 }
518 }
519 return null;
520 },
522 /**
523 * Fired after a registered DragDrop object gets the mousedown event.
524 * Sets up the events required to track the object being dragged
525 * @method handleMouseDown
526 * @param {Event} e the event
527 * @param oDD the DragDrop object being dragged
528 * @private
529 * @static
530 */
531 handleMouseDown: function(e, oDD) {
533 this.currentTarget = YAHOO.util.Event.getTarget(e);
535 this.dragCurrent = oDD;
537 var el = oDD.getEl();
539 // track start position
540 this.startX = YAHOO.util.Event.getPageX(e);
541 this.startY = YAHOO.util.Event.getPageY(e);
543 this.deltaX = this.startX - el.offsetLeft;
544 this.deltaY = this.startY - el.offsetTop;
546 this.dragThreshMet = false;
548 this.clickTimeout = setTimeout(
549 function() {
550 var DDM = YAHOO.util.DDM;
551 DDM.startDrag(DDM.startX, DDM.startY);
552 },
553 this.clickTimeThresh );
554 },
556 /**
557 * Fired when either the drag pixel threshol or the mousedown hold
558 * time threshold has been met.
559 * @method startDrag
560 * @param x {int} the X position of the original mousedown
561 * @param y {int} the Y position of the original mousedown
562 * @static
563 */
564 startDrag: function(x, y) {
565 YAHOO.log("firing drag start events", "info", "DragDropMgr");
566 clearTimeout(this.clickTimeout);
567 var dc = this.dragCurrent;
568 if (dc) {
569 dc.b4StartDrag(x, y);
570 }
571 if (dc) {
572 dc.startDrag(x, y);
573 }
574 this.dragThreshMet = true;
575 },
577 /**
578 * Internal function to handle the mouseup event. Will be invoked
579 * from the context of the document.
580 * @method handleMouseUp
581 * @param {Event} e the event
582 * @private
583 * @static
584 */
585 handleMouseUp: function(e) {
586 if (this.dragCurrent) {
587 clearTimeout(this.clickTimeout);
589 if (this.dragThreshMet) {
590 YAHOO.log("mouseup detected - completing drag", "info", "DragDropMgr");
591 this.fireEvents(e, true);
592 } else {
593 YAHOO.log("drag threshold not met", "info", "DragDropMgr");
594 }
596 this.stopDrag(e);
598 this.stopEvent(e);
599 }
600 },
602 /**
603 * Utility to stop event propagation and event default, if these
604 * features are turned on.
605 * @method stopEvent
606 * @param {Event} e the event as returned by this.getEvent()
607 * @static
608 */
609 stopEvent: function(e) {
610 if (this.stopPropagation) {
611 YAHOO.util.Event.stopPropagation(e);
612 }
614 if (this.preventDefault) {
615 YAHOO.util.Event.preventDefault(e);
616 }
617 },
619 /**
620 * Ends the current drag, cleans up the state, and fires the endDrag
621 * and mouseUp events. Called internally when a mouseup is detected
622 * during the drag. Can be fired manually during the drag by passing
623 * either another event (such as the mousemove event received in onDrag)
624 * or a fake event with pageX and pageY defined (so that endDrag and
625 * onMouseUp have usable position data.). Alternatively, pass true
626 * for the silent parameter so that the endDrag and onMouseUp events
627 * are skipped (so no event data is needed.)
628 *
629 * @method stopDrag
630 * @param {Event} e the mouseup event, another event (or a fake event)
631 * with pageX and pageY defined, or nothing if the
632 * silent parameter is true
633 * @param {boolean} silent skips the enddrag and mouseup events if true
634 * @static
635 */
636 stopDrag: function(e, silent) {
637 // YAHOO.log("mouseup - removing event handlers");
639 // Fire the drag end event for the item that was dragged
640 if (this.dragCurrent && !silent) {
641 if (this.dragThreshMet) {
642 YAHOO.log("firing endDrag events", "info", "DragDropMgr");
643 this.dragCurrent.b4EndDrag(e);
644 this.dragCurrent.endDrag(e);
645 }
647 YAHOO.log("firing dragdrop onMouseUp event", "info", "DragDropMgr");
648 this.dragCurrent.onMouseUp(e);
649 }
651 this.dragCurrent = null;
652 this.dragOvers = {};
653 },
655 /**
656 * Internal function to handle the mousemove event. Will be invoked
657 * from the context of the html element.
658 *
659 * @TODO figure out what we can do about mouse events lost when the
660 * user drags objects beyond the window boundary. Currently we can
661 * detect this in internet explorer by verifying that the mouse is
662 * down during the mousemove event. Firefox doesn't give us the
663 * button state on the mousemove event.
664 * @method handleMouseMove
665 * @param {Event} e the event
666 * @private
667 * @static
668 */
669 handleMouseMove: function(e) {
670 //YAHOO.log("handlemousemove");
672 var dc = this.dragCurrent;
673 if (dc) {
674 // YAHOO.log("no current drag obj");
676 // var button = e.which || e.button;
677 // YAHOO.log("which: " + e.which + ", button: "+ e.button);
679 // check for IE mouseup outside of page boundary
680 if (YAHOO.util.Event.isIE && !e.button) {
681 YAHOO.log("button failure", "info", "DragDropMgr");
682 this.stopEvent(e);
683 return this.handleMouseUp(e);
684 }
686 if (!this.dragThreshMet) {
687 var diffX = Math.abs(this.startX - YAHOO.util.Event.getPageX(e));
688 var diffY = Math.abs(this.startY - YAHOO.util.Event.getPageY(e));
689 // YAHOO.log("diffX: " + diffX + "diffY: " + diffY);
690 if (diffX > this.clickPixelThresh ||
691 diffY > this.clickPixelThresh) {
692 YAHOO.log("pixel threshold met", "info", "DragDropMgr");
693 this.startDrag(this.startX, this.startY);
694 }
695 }
697 if (this.dragThreshMet) {
698 dc.b4Drag(e);
699 if (dc) {
700 dc.onDrag(e);
701 }
702 if (dc) {
703 this.fireEvents(e, false);
704 }
705 }
707 this.stopEvent(e);
708 }
709 },
711 /**
712 * Iterates over all of the DragDrop elements to find ones we are
713 * hovering over or dropping on
714 * @method fireEvents
715 * @param {Event} e the event
716 * @param {boolean} isDrop is this a drop op or a mouseover op?
717 * @private
718 * @static
719 */
720 fireEvents: function(e, isDrop) {
721 var dc = this.dragCurrent;
723 // If the user did the mouse up outside of the window, we could
724 // get here even though we have ended the drag.
725 if (!dc || dc.isLocked()) {
726 return;
727 }
729 var x = YAHOO.util.Event.getPageX(e);
730 var y = YAHOO.util.Event.getPageY(e);
731 var pt = new YAHOO.util.Point(x,y);
732 var pos = dc.getTargetCoord(pt.x, pt.y);
733 var el = dc.getDragEl();
734 curRegion = new YAHOO.util.Region( pos.y,
735 pos.x + el.offsetWidth,
736 pos.y + el.offsetHeight,
737 pos.x );
738 // cache the previous dragOver array
739 var oldOvers = [];
741 var outEvts = [];
742 var overEvts = [];
743 var dropEvts = [];
744 var enterEvts = [];
747 // Check to see if the object(s) we were hovering over is no longer
748 // being hovered over so we can fire the onDragOut event
749 for (var i in this.dragOvers) {
751 var ddo = this.dragOvers[i];
753 if (! this.isTypeOfDD(ddo)) {
754 continue;
755 }
757 if (! this.isOverTarget(pt, ddo, this.mode, curRegion)) {
758 outEvts.push( ddo );
759 }
761 oldOvers[i] = true;
762 delete this.dragOvers[i];
763 }
765 for (var sGroup in dc.groups) {
766 // YAHOO.log("Processing group " + sGroup);
768 if ("string" != typeof sGroup) {
769 continue;
770 }
772 for (i in this.ids[sGroup]) {
773 var oDD = this.ids[sGroup][i];
774 if (! this.isTypeOfDD(oDD)) {
775 continue;
776 }
778 if (oDD.isTarget && !oDD.isLocked() && oDD != dc) {
779 if (this.isOverTarget(pt, oDD, this.mode, curRegion)) {
780 // look for drop interactions
781 if (isDrop) {
782 dropEvts.push( oDD );
783 // look for drag enter and drag over interactions
784 } else {
786 // initial drag over: dragEnter fires
787 if (!oldOvers[oDD.id]) {
788 enterEvts.push( oDD );
789 // subsequent drag overs: dragOver fires
790 } else {
791 overEvts.push( oDD );
792 }
794 this.dragOvers[oDD.id] = oDD;
795 }
796 }
797 }
798 }
799 }
801 this.interactionInfo = {
802 out: outEvts,
803 enter: enterEvts,
804 over: overEvts,
805 drop: dropEvts,
806 point: pt,
807 draggedRegion: curRegion,
808 sourceRegion: this.locationCache[dc.id],
809 validDrop: isDrop
810 };
812 // notify about a drop that did not find a target
813 if (isDrop && !dropEvts.length) {
814 YAHOO.log(dc.id + " dropped, but not on a target", "info", "DragDropMgr");
815 this.interactionInfo.validDrop = false;
816 dc.onInvalidDrop(e);
817 }
820 if (this.mode) {
821 if (outEvts.length) {
822 YAHOO.log(dc.id+" onDragOut: " + outEvts, "info", "DragDropMgr");
823 dc.b4DragOut(e, outEvts);
824 if (dc) {
825 dc.onDragOut(e, outEvts);
826 }
827 }
829 if (enterEvts.length) {
830 YAHOO.log(dc.id+" onDragEnter: " + enterEvts, "info", "DragDropMgr");
831 if (dc) {
832 dc.onDragEnter(e, enterEvts);
833 }
834 }
836 if (overEvts.length) {
837 YAHOO.log(dc.id+" onDragOver: " + overEvts, "info", "DragDropMgr");
838 if (dc) {
839 dc.b4DragOver(e, overEvts);
840 }
842 if (dc) {
843 dc.onDragOver(e, overEvts);
844 }
845 }
847 if (dropEvts.length) {
848 YAHOO.log(dc.id+" onDragDrop: " + dropEvts, "info", "DragDropMgr");
849 if (dc) {
850 dc.b4DragDrop(e, dropEvts);
851 }
852 if (dc) {
853 dc.onDragDrop(e, dropEvts);
854 }
855 }
857 } else {
858 // fire dragout events
859 var len = 0;
860 for (i=0, len=outEvts.length; i<len; ++i) {
861 YAHOO.log(dc.id+" onDragOut: " + outEvts[i].id, "info", "DragDropMgr");
862 if (dc) {
863 dc.b4DragOut(e, outEvts[i].id);
864 }
865 if (dc) {
866 dc.onDragOut(e, outEvts[i].id);
867 }
868 }
870 // fire enter events
871 for (i=0,len=enterEvts.length; i<len; ++i) {
872 YAHOO.log(dc.id + " onDragEnter " + enterEvts[i].id, "info", "DragDropMgr");
873 // dc.b4DragEnter(e, oDD.id);
875 if (dc) {
876 dc.onDragEnter(e, enterEvts[i].id);
877 }
878 }
880 // fire over events
881 for (i=0,len=overEvts.length; i<len; ++i) {
882 YAHOO.log(dc.id + " onDragOver " + overEvts[i].id, "info", "DragDropMgr");
883 if (dc) {
884 dc.b4DragOver(e, overEvts[i].id);
885 }
886 if (dc) {
887 dc.onDragOver(e, overEvts[i].id);
888 }
889 }
891 // fire drop events
892 for (i=0, len=dropEvts.length; i<len; ++i) {
893 YAHOO.log(dc.id + " dropped on " + dropEvts[i].id, "info", "DragDropMgr");
894 if (dc) {
895 dc.b4DragDrop(e, dropEvts[i].id);
896 }
897 if (dc) {
898 dc.onDragDrop(e, dropEvts[i].id);
899 }
900 }
902 }
903 },
905 /**
906 * Helper function for getting the best match from the list of drag
907 * and drop objects returned by the drag and drop events when we are
908 * in INTERSECT mode. It returns either the first object that the
909 * cursor is over, or the object that has the greatest overlap with
910 * the dragged element.
911 * @method getBestMatch
912 * @param {DragDrop[]} dds The array of drag and drop objects
913 * targeted
914 * @return {DragDrop} The best single match
915 * @static
916 */
917 getBestMatch: function(dds) {
918 var winner = null;
920 var len = dds.length;
922 if (len == 1) {
923 winner = dds[0];
924 } else {
925 // Loop through the targeted items
926 for (var i=0; i<len; ++i) {
927 var dd = dds[i];
928 // If the cursor is over the object, it wins. If the
929 // cursor is over multiple matches, the first one we come
930 // to wins.
931 if (this.mode == this.INTERSECT && dd.cursorIsOver) {
932 winner = dd;
933 break;
934 // Otherwise the object with the most overlap wins
935 } else {
936 if (!winner || !winner.overlap || (dd.overlap &&
937 winner.overlap.getArea() < dd.overlap.getArea())) {
938 winner = dd;
939 }
940 }
941 }
942 }
944 return winner;
945 },
947 /**
948 * Refreshes the cache of the top-left and bottom-right points of the
949 * drag and drop objects in the specified group(s). This is in the
950 * format that is stored in the drag and drop instance, so typical
951 * usage is:
952 * <code>
953 * YAHOO.util.DragDropMgr.refreshCache(ddinstance.groups);
954 * </code>
955 * Alternatively:
956 * <code>
957 * YAHOO.util.DragDropMgr.refreshCache({group1:true, group2:true});
958 * </code>
959 * @TODO this really should be an indexed array. Alternatively this
960 * method could accept both.
961 * @method refreshCache
962 * @param {Object} groups an associative array of groups to refresh
963 * @static
964 */
965 refreshCache: function(groups) {
966 YAHOO.log("refreshing element location cache", "info", "DragDropMgr");
968 // refresh everything if group array is not provided
969 var g = groups || this.ids;
971 for (var sGroup in g) {
972 if ("string" != typeof sGroup) {
973 continue;
974 }
975 for (var i in this.ids[sGroup]) {
976 var oDD = this.ids[sGroup][i];
978 if (this.isTypeOfDD(oDD)) {
979 var loc = this.getLocation(oDD);
980 if (loc) {
981 this.locationCache[oDD.id] = loc;
982 } else {
983 delete this.locationCache[oDD.id];
984 YAHOO.log("Could not get the loc for " + oDD.id, "warn", "DragDropMgr");
985 }
986 }
987 }
988 }
989 },
991 /**
992 * This checks to make sure an element exists and is in the DOM. The
993 * main purpose is to handle cases where innerHTML is used to remove
994 * drag and drop objects from the DOM. IE provides an 'unspecified
995 * error' when trying to access the offsetParent of such an element
996 * @method verifyEl
997 * @param {HTMLElement} el the element to check
998 * @return {boolean} true if the element looks usable
999 * @static
1000 */
1001 verifyEl: function(el) {
1002 try {
1003 if (el) {
1004 var parent = el.offsetParent;
1005 if (parent) {
1006 return true;
1007 }
1008 }
1009 } catch(e) {
1010 YAHOO.log("detected problem with an element", "info", "DragDropMgr");
1011 }
1013 return false;
1014 },
1016 /**
1017 * Returns a Region object containing the drag and drop element's position
1018 * and size, including the padding configured for it
1019 * @method getLocation
1020 * @param {DragDrop} oDD the drag and drop object to get the
1021 * location for
1022 * @return {YAHOO.util.Region} a Region object representing the total area
1023 * the element occupies, including any padding
1024 * the instance is configured for.
1025 * @static
1026 */
1027 getLocation: function(oDD) {
1028 if (! this.isTypeOfDD(oDD)) {
1029 YAHOO.log(oDD + " is not a DD obj", "info", "DragDropMgr");
1030 return null;
1031 }
1033 var el = oDD.getEl(), pos, x1, x2, y1, y2, t, r, b, l;
1035 try {
1036 pos= YAHOO.util.Dom.getXY(el);
1037 } catch (e) { }
1039 if (!pos) {
1040 YAHOO.log("getXY failed", "info", "DragDropMgr");
1041 return null;
1042 }
1044 x1 = pos[0];
1045 x2 = x1 + el.offsetWidth;
1046 y1 = pos[1];
1047 y2 = y1 + el.offsetHeight;
1049 t = y1 - oDD.padding[0];
1050 r = x2 + oDD.padding[1];
1051 b = y2 + oDD.padding[2];
1052 l = x1 - oDD.padding[3];
1054 return new YAHOO.util.Region( t, r, b, l );
1055 },
1057 /**
1058 * Checks the cursor location to see if it over the target
1059 * @method isOverTarget
1060 * @param {YAHOO.util.Point} pt The point to evaluate
1061 * @param {DragDrop} oTarget the DragDrop object we are inspecting
1062 * @param {boolean} intersect true if we are in intersect mode
1063 * @param {YAHOO.util.Region} pre-cached location of the dragged element
1064 * @return {boolean} true if the mouse is over the target
1065 * @private
1066 * @static
1067 */
1068 isOverTarget: function(pt, oTarget, intersect, curRegion) {
1069 // use cache if available
1070 var loc = this.locationCache[oTarget.id];
1071 if (!loc || !this.useCache) {
1072 YAHOO.log("cache not populated", "info", "DragDropMgr");
1073 loc = this.getLocation(oTarget);
1074 this.locationCache[oTarget.id] = loc;
1076 YAHOO.log("cache: " + loc, "info", "DragDropMgr");
1077 }
1079 if (!loc) {
1080 YAHOO.log("could not get the location of the element", "info", "DragDropMgr");
1081 return false;
1082 }
1084 //YAHOO.log("loc: " + loc + ", pt: " + pt);
1085 oTarget.cursorIsOver = loc.contains( pt );
1087 // DragDrop is using this as a sanity check for the initial mousedown
1088 // in this case we are done. In POINT mode, if the drag obj has no
1089 // contraints, we are done. Otherwise we need to evaluate the
1090 // region the target as occupies to determine if the dragged element
1091 // overlaps with it.
1093 var dc = this.dragCurrent;
1094 if (!dc || (!intersect && !dc.constrainX && !dc.constrainY)) {
1096 //if (oTarget.cursorIsOver) {
1097 //YAHOO.log("over " + oTarget + ", " + loc + ", " + pt, "warn");
1098 //}
1099 return oTarget.cursorIsOver;
1100 }
1102 oTarget.overlap = null;
1104 // Get the current location of the drag element, this is the
1105 // location of the mouse event less the delta that represents
1106 // where the original mousedown happened on the element. We
1107 // need to consider constraints and ticks as well.
1109 if (!curRegion) {
1110 var pos = dc.getTargetCoord(pt.x, pt.y);
1111 var el = dc.getDragEl();
1112 curRegion = new YAHOO.util.Region( pos.y,
1113 pos.x + el.offsetWidth,
1114 pos.y + el.offsetHeight,
1115 pos.x );
1116 }
1118 var overlap = curRegion.intersect(loc);
1120 if (overlap) {
1121 oTarget.overlap = overlap;
1122 return (intersect) ? true : oTarget.cursorIsOver;
1123 } else {
1124 return false;
1125 }
1126 },
1128 /**
1129 * unload event handler
1130 * @method _onUnload
1131 * @private
1132 * @static
1133 */
1134 _onUnload: function(e, me) {
1135 this.unregAll();
1136 },
1138 /**
1139 * Cleans up the drag and drop events and objects.
1140 * @method unregAll
1141 * @private
1142 * @static
1143 */
1144 unregAll: function() {
1145 YAHOO.log("unregister all", "info", "DragDropMgr");
1147 if (this.dragCurrent) {
1148 this.stopDrag();
1149 this.dragCurrent = null;
1150 }
1152 this._execOnAll("unreg", []);
1154 for (i in this.elementCache) {
1155 delete this.elementCache[i];
1156 }
1158 this.elementCache = {};
1159 this.ids = {};
1160 },
1162 /**
1163 * A cache of DOM elements
1164 * @property elementCache
1165 * @private
1166 * @static
1167 */
1168 elementCache: {},
1170 /**
1171 * Get the wrapper for the DOM element specified
1172 * @method getElWrapper
1173 * @param {String} id the id of the element to get
1174 * @return {YAHOO.util.DDM.ElementWrapper} the wrapped element
1175 * @private
1176 * @deprecated This wrapper isn't that useful
1177 * @static
1178 */
1179 getElWrapper: function(id) {
1180 var oWrapper = this.elementCache[id];
1181 if (!oWrapper || !oWrapper.el) {
1182 oWrapper = this.elementCache[id] =
1183 new this.ElementWrapper(YAHOO.util.Dom.get(id));
1184 }
1185 return oWrapper;
1186 },
1188 /**
1189 * Returns the actual DOM element
1190 * @method getElement
1191 * @param {String} id the id of the elment to get
1192 * @return {Object} The element
1193 * @deprecated use YAHOO.util.Dom.get instead
1194 * @static
1195 */
1196 getElement: function(id) {
1197 return YAHOO.util.Dom.get(id);
1198 },
1200 /**
1201 * Returns the style property for the DOM element (i.e.,
1202 * document.getElById(id).style)
1203 * @method getCss
1204 * @param {String} id the id of the elment to get
1205 * @return {Object} The style property of the element
1206 * @deprecated use YAHOO.util.Dom instead
1207 * @static
1208 */
1209 getCss: function(id) {
1210 var el = YAHOO.util.Dom.get(id);
1211 return (el) ? el.style : null;
1212 },
1214 /**
1215 * Inner class for cached elements
1216 * @class DragDropMgr.ElementWrapper
1217 * @for DragDropMgr
1218 * @private
1219 * @deprecated
1220 */
1221 ElementWrapper: function(el) {
1222 /**
1223 * The element
1224 * @property el
1225 */
1226 this.el = el || null;
1227 /**
1228 * The element id
1229 * @property id
1230 */
1231 this.id = this.el && el.id;
1232 /**
1233 * A reference to the style property
1234 * @property css
1235 */
1236 this.css = this.el && el.style;
1237 },
1239 /**
1240 * Returns the X position of an html element
1241 * @method getPosX
1242 * @param el the element for which to get the position
1243 * @return {int} the X coordinate
1244 * @for DragDropMgr
1245 * @deprecated use YAHOO.util.Dom.getX instead
1246 * @static
1247 */
1248 getPosX: function(el) {
1249 return YAHOO.util.Dom.getX(el);
1250 },
1252 /**
1253 * Returns the Y position of an html element
1254 * @method getPosY
1255 * @param el the element for which to get the position
1256 * @return {int} the Y coordinate
1257 * @deprecated use YAHOO.util.Dom.getY instead
1258 * @static
1259 */
1260 getPosY: function(el) {
1261 return YAHOO.util.Dom.getY(el);
1262 },
1264 /**
1265 * Swap two nodes. In IE, we use the native method, for others we
1266 * emulate the IE behavior
1267 * @method swapNode
1268 * @param n1 the first node to swap
1269 * @param n2 the other node to swap
1270 * @static
1271 */
1272 swapNode: function(n1, n2) {
1273 if (n1.swapNode) {
1274 n1.swapNode(n2);
1275 } else {
1276 var p = n2.parentNode;
1277 var s = n2.nextSibling;
1279 if (s == n1) {
1280 p.insertBefore(n1, n2);
1281 } else if (n2 == n1.nextSibling) {
1282 p.insertBefore(n2, n1);
1283 } else {
1284 n1.parentNode.replaceChild(n2, n1);
1285 p.insertBefore(n1, s);
1286 }
1287 }
1288 },
1290 /**
1291 * Returns the current scroll position
1292 * @method getScroll
1293 * @private
1294 * @static
1295 */
1296 getScroll: function () {
1297 var t, l, dde=document.documentElement, db=document.body;
1298 if (dde && (dde.scrollTop || dde.scrollLeft)) {
1299 t = dde.scrollTop;
1300 l = dde.scrollLeft;
1301 } else if (db) {
1302 t = db.scrollTop;
1303 l = db.scrollLeft;
1304 } else {
1305 YAHOO.log("could not get scroll property", "info", "DragDropMgr");
1306 }
1307 return { top: t, left: l };
1308 },
1310 /**
1311 * Returns the specified element style property
1312 * @method getStyle
1313 * @param {HTMLElement} el the element
1314 * @param {string} styleProp the style property
1315 * @return {string} The value of the style property
1316 * @deprecated use YAHOO.util.Dom.getStyle
1317 * @static
1318 */
1319 getStyle: function(el, styleProp) {
1320 return YAHOO.util.Dom.getStyle(el, styleProp);
1321 },
1323 /**
1324 * Gets the scrollTop
1325 * @method getScrollTop
1326 * @return {int} the document's scrollTop
1327 * @static
1328 */
1329 getScrollTop: function () { return this.getScroll().top; },
1331 /**
1332 * Gets the scrollLeft
1333 * @method getScrollLeft
1334 * @return {int} the document's scrollTop
1335 * @static
1336 */
1337 getScrollLeft: function () { return this.getScroll().left; },
1339 /**
1340 * Sets the x/y position of an element to the location of the
1341 * target element.
1342 * @method moveToEl
1343 * @param {HTMLElement} moveEl The element to move
1344 * @param {HTMLElement} targetEl The position reference element
1345 * @static
1346 */
1347 moveToEl: function (moveEl, targetEl) {
1348 var aCoord = YAHOO.util.Dom.getXY(targetEl);
1349 YAHOO.log("moveToEl: " + aCoord, "info", "DragDropMgr");
1350 YAHOO.util.Dom.setXY(moveEl, aCoord);
1351 },
1353 /**
1354 * Gets the client height
1355 * @method getClientHeight
1356 * @return {int} client height in px
1357 * @deprecated use YAHOO.util.Dom.getViewportHeight instead
1358 * @static
1359 */
1360 getClientHeight: function() {
1361 return YAHOO.util.Dom.getViewportHeight();
1362 },
1364 /**
1365 * Gets the client width
1366 * @method getClientWidth
1367 * @return {int} client width in px
1368 * @deprecated use YAHOO.util.Dom.getViewportWidth instead
1369 * @static
1370 */
1371 getClientWidth: function() {
1372 return YAHOO.util.Dom.getViewportWidth();
1373 },
1375 /**
1376 * Numeric array sort function
1377 * @method numericSort
1378 * @static
1379 */
1380 numericSort: function(a, b) { return (a - b); },
1382 /**
1383 * Internal counter
1384 * @property _timeoutCount
1385 * @private
1386 * @static
1387 */
1388 _timeoutCount: 0,
1390 /**
1391 * Trying to make the load order less important. Without this we get
1392 * an error if this file is loaded before the Event Utility.
1393 * @method _addListeners
1394 * @private
1395 * @static
1396 */
1397 _addListeners: function() {
1398 var DDM = YAHOO.util.DDM;
1399 if ( YAHOO.util.Event && document ) {
1400 DDM._onLoad();
1401 } else {
1402 if (DDM._timeoutCount > 2000) {
1403 YAHOO.log("DragDrop requires the Event Utility", "error", "DragDropMgr");
1404 } else {
1405 setTimeout(DDM._addListeners, 10);
1406 if (document && document.body) {
1407 DDM._timeoutCount += 1;
1408 }
1409 }
1410 }
1411 },
1413 /**
1414 * Recursively searches the immediate parent and all child nodes for
1415 * the handle element in order to determine wheter or not it was
1416 * clicked.
1417 * @method handleWasClicked
1418 * @param node the html element to inspect
1419 * @static
1420 */
1421 handleWasClicked: function(node, id) {
1422 if (this.isHandle(id, node.id)) {
1423 YAHOO.log("clicked node is a handle", "info", "DragDropMgr");
1424 return true;
1425 } else {
1426 // check to see if this is a text node child of the one we want
1427 var p = node.parentNode;
1428 // YAHOO.log("p: " + p);
1430 while (p) {
1431 if (this.isHandle(id, p.id)) {
1432 return true;
1433 } else {
1434 YAHOO.log(p.id + " is not a handle", "info", "DragDropMgr");
1435 p = p.parentNode;
1436 }
1437 }
1438 }
1440 return false;
1441 }
1443 };
1445 }();
1447 // shorter alias, save a few bytes
1448 YAHOO.util.DDM = YAHOO.util.DragDropMgr;
1449 YAHOO.util.DDM._addListeners();
1451 }
1453 (function() {
1455 var Event=YAHOO.util.Event;
1456 var Dom=YAHOO.util.Dom;
1458 /**
1459 * Defines the interface and base operation of items that that can be
1460 * dragged or can be drop targets. It was designed to be extended, overriding
1461 * the event handlers for startDrag, onDrag, onDragOver, onDragOut.
1462 * Up to three html elements can be associated with a DragDrop instance:
1463 * <ul>
1464 * <li>linked element: the element that is passed into the constructor.
1465 * This is the element which defines the boundaries for interaction with
1466 * other DragDrop objects.</li>
1467 * <li>handle element(s): The drag operation only occurs if the element that
1468 * was clicked matches a handle element. By default this is the linked
1469 * element, but there are times that you will want only a portion of the
1470 * linked element to initiate the drag operation, and the setHandleElId()
1471 * method provides a way to define this.</li>
1472 * <li>drag element: this represents an the element that would be moved along
1473 * with the cursor during a drag operation. By default, this is the linked
1474 * element itself as in {@link YAHOO.util.DD}. setDragElId() lets you define
1475 * a separate element that would be moved, as in {@link YAHOO.util.DDProxy}
1476 * </li>
1477 * </ul>
1478 * This class should not be instantiated until the onload event to ensure that
1479 * the associated elements are available.
1480 * The following would define a DragDrop obj that would interact with any
1481 * other DragDrop obj in the "group1" group:
1482 * <pre>
1483 * dd = new YAHOO.util.DragDrop("div1", "group1");
1484 * </pre>
1485 * Since none of the event handlers have been implemented, nothing would
1486 * actually happen if you were to run the code above. Normally you would
1487 * override this class or one of the default implementations, but you can
1488 * also override the methods you want on an instance of the class...
1489 * <pre>
1490 * dd.onDragDrop = function(e, id) {
1491 * alert("dd was dropped on " + id);
1492 * }
1493 * </pre>
1494 * @namespace YAHOO.util
1495 * @class DragDrop
1496 * @constructor
1497 * @param {String} id of the element that is linked to this instance
1498 * @param {String} sGroup the group of related DragDrop objects
1499 * @param {object} config an object containing configurable attributes
1500 * Valid properties for DragDrop:
1501 * padding, isTarget, maintainOffset, primaryButtonOnly,
1502 */
1503 YAHOO.util.DragDrop = function(id, sGroup, config) {
1504 if (id) {
1505 this.init(id, sGroup, config);
1506 }
1507 };
1509 YAHOO.util.DragDrop.prototype = {
1511 /**
1512 * The id of the element associated with this object. This is what we
1513 * refer to as the "linked element" because the size and position of
1514 * this element is used to determine when the drag and drop objects have
1515 * interacted.
1516 * @property id
1517 * @type String
1518 */
1519 id: null,
1521 /**
1522 * Configuration attributes passed into the constructor
1523 * @property config
1524 * @type object
1525 */
1526 config: null,
1528 /**
1529 * The id of the element that will be dragged. By default this is same
1530 * as the linked element , but could be changed to another element. Ex:
1531 * YAHOO.util.DDProxy
1532 * @property dragElId
1533 * @type String
1534 * @private
1535 */
1536 dragElId: null,
1538 /**
1539 * the id of the element that initiates the drag operation. By default
1540 * this is the linked element, but could be changed to be a child of this
1541 * element. This lets us do things like only starting the drag when the
1542 * header element within the linked html element is clicked.
1543 * @property handleElId
1544 * @type String
1545 * @private
1546 */
1547 handleElId: null,
1549 /**
1550 * An associative array of HTML tags that will be ignored if clicked.
1551 * @property invalidHandleTypes
1552 * @type {string: string}
1553 */
1554 invalidHandleTypes: null,
1556 /**
1557 * An associative array of ids for elements that will be ignored if clicked
1558 * @property invalidHandleIds
1559 * @type {string: string}
1560 */
1561 invalidHandleIds: null,
1563 /**
1564 * An indexted array of css class names for elements that will be ignored
1565 * if clicked.
1566 * @property invalidHandleClasses
1567 * @type string[]
1568 */
1569 invalidHandleClasses: null,
1571 /**
1572 * The linked element's absolute X position at the time the drag was
1573 * started
1574 * @property startPageX
1575 * @type int
1576 * @private
1577 */
1578 startPageX: 0,
1580 /**
1581 * The linked element's absolute X position at the time the drag was
1582 * started
1583 * @property startPageY
1584 * @type int
1585 * @private
1586 */
1587 startPageY: 0,
1589 /**
1590 * The group defines a logical collection of DragDrop objects that are
1591 * related. Instances only get events when interacting with other
1592 * DragDrop object in the same group. This lets us define multiple
1593 * groups using a single DragDrop subclass if we want.
1594 * @property groups
1595 * @type {string: string}
1596 */
1597 groups: null,
1599 /**
1600 * Individual drag/drop instances can be locked. This will prevent
1601 * onmousedown start drag.
1602 * @property locked
1603 * @type boolean
1604 * @private
1605 */
1606 locked: false,
1608 /**
1609 * Lock this instance
1610 * @method lock
1611 */
1612 lock: function() { this.locked = true; },
1614 /**
1615 * Unlock this instace
1616 * @method unlock
1617 */
1618 unlock: function() { this.locked = false; },
1620 /**
1621 * By default, all instances can be a drop target. This can be disabled by
1622 * setting isTarget to false.
1623 * @method isTarget
1624 * @type boolean
1625 */
1626 isTarget: true,
1628 /**
1629 * The padding configured for this drag and drop object for calculating
1630 * the drop zone intersection with this object.
1631 * @method padding
1632 * @type int[]
1633 */
1634 padding: null,
1636 /**
1637 * Cached reference to the linked element
1638 * @property _domRef
1639 * @private
1640 */
1641 _domRef: null,
1643 /**
1644 * Internal typeof flag
1645 * @property __ygDragDrop
1646 * @private
1647 */
1648 __ygDragDrop: true,
1650 /**
1651 * Set to true when horizontal contraints are applied
1652 * @property constrainX
1653 * @type boolean
1654 * @private
1655 */
1656 constrainX: false,
1658 /**
1659 * Set to true when vertical contraints are applied
1660 * @property constrainY
1661 * @type boolean
1662 * @private
1663 */
1664 constrainY: false,
1666 /**
1667 * The left constraint
1668 * @property minX
1669 * @type int
1670 * @private
1671 */
1672 minX: 0,
1674 /**
1675 * The right constraint
1676 * @property maxX
1677 * @type int
1678 * @private
1679 */
1680 maxX: 0,
1682 /**
1683 * The up constraint
1684 * @property minY
1685 * @type int
1686 * @type int
1687 * @private
1688 */
1689 minY: 0,
1691 /**
1692 * The down constraint
1693 * @property maxY
1694 * @type int
1695 * @private
1696 */
1697 maxY: 0,
1699 /**
1700 * The difference between the click position and the source element's location
1701 * @property deltaX
1702 * @type int
1703 * @private
1704 */
1705 deltaX: 0,
1707 /**
1708 * The difference between the click position and the source element's location
1709 * @property deltaY
1710 * @type int
1711 * @private
1712 */
1713 deltaY: 0,
1715 /**
1716 * Maintain offsets when we resetconstraints. Set to true when you want
1717 * the position of the element relative to its parent to stay the same
1718 * when the page changes
1719 *
1720 * @property maintainOffset
1721 * @type boolean
1722 */
1723 maintainOffset: false,
1725 /**
1726 * Array of pixel locations the element will snap to if we specified a
1727 * horizontal graduation/interval. This array is generated automatically
1728 * when you define a tick interval.
1729 * @property xTicks
1730 * @type int[]
1731 */
1732 xTicks: null,
1734 /**
1735 * Array of pixel locations the element will snap to if we specified a
1736 * vertical graduation/interval. This array is generated automatically
1737 * when you define a tick interval.
1738 * @property yTicks
1739 * @type int[]
1740 */
1741 yTicks: null,
1743 /**
1744 * By default the drag and drop instance will only respond to the primary
1745 * button click (left button for a right-handed mouse). Set to true to
1746 * allow drag and drop to start with any mouse click that is propogated
1747 * by the browser
1748 * @property primaryButtonOnly
1749 * @type boolean
1750 */
1751 primaryButtonOnly: true,
1753 /**
1754 * The availabe property is false until the linked dom element is accessible.
1755 * @property available
1756 * @type boolean
1757 */
1758 available: false,
1760 /**
1761 * By default, drags can only be initiated if the mousedown occurs in the
1762 * region the linked element is. This is done in part to work around a
1763 * bug in some browsers that mis-report the mousedown if the previous
1764 * mouseup happened outside of the window. This property is set to true
1765 * if outer handles are defined.
1766 *
1767 * @property hasOuterHandles
1768 * @type boolean
1769 * @default false
1770 */
1771 hasOuterHandles: false,
1773 /**
1774 * Property that is assigned to a drag and drop object when testing to
1775 * see if it is being targeted by another dd object. This property
1776 * can be used in intersect mode to help determine the focus of
1777 * the mouse interaction. DDM.getBestMatch uses this property first to
1778 * determine the closest match in INTERSECT mode when multiple targets
1779 * are part of the same interaction.
1780 * @property cursorIsOver
1781 * @type boolean
1782 */
1783 cursorIsOver: false,
1785 /**
1786 * Property that is assigned to a drag and drop object when testing to
1787 * see if it is being targeted by another dd object. This is a region
1788 * that represents the area the draggable element overlaps this target.
1789 * DDM.getBestMatch uses this property to compare the size of the overlap
1790 * to that of other targets in order to determine the closest match in
1791 * INTERSECT mode when multiple targets are part of the same interaction.
1792 * @property overlap
1793 * @type YAHOO.util.Region
1794 */
1795 overlap: null,
1797 /**
1798 * Code that executes immediately before the startDrag event
1799 * @method b4StartDrag
1800 * @private
1801 */
1802 b4StartDrag: function(x, y) { },
1804 /**
1805 * Abstract method called after a drag/drop object is clicked
1806 * and the drag or mousedown time thresholds have beeen met.
1807 * @method startDrag
1808 * @param {int} X click location
1809 * @param {int} Y click location
1810 */
1811 startDrag: function(x, y) { /* override this */ },
1813 /**
1814 * Code that executes immediately before the onDrag event
1815 * @method b4Drag
1816 * @private
1817 */
1818 b4Drag: function(e) { },
1820 /**
1821 * Abstract method called during the onMouseMove event while dragging an
1822 * object.
1823 * @method onDrag
1824 * @param {Event} e the mousemove event
1825 */
1826 onDrag: function(e) { /* override this */ },
1828 /**
1829 * Abstract method called when this element fist begins hovering over
1830 * another DragDrop obj
1831 * @method onDragEnter
1832 * @param {Event} e the mousemove event
1833 * @param {String|DragDrop[]} id In POINT mode, the element
1834 * id this is hovering over. In INTERSECT mode, an array of one or more
1835 * dragdrop items being hovered over.
1836 */
1837 onDragEnter: function(e, id) { /* override this */ },
1839 /**
1840 * Code that executes immediately before the onDragOver event
1841 * @method b4DragOver
1842 * @private
1843 */
1844 b4DragOver: function(e) { },
1846 /**
1847 * Abstract method called when this element is hovering over another
1848 * DragDrop obj
1849 * @method onDragOver
1850 * @param {Event} e the mousemove event
1851 * @param {String|DragDrop[]} id In POINT mode, the element
1852 * id this is hovering over. In INTERSECT mode, an array of dd items
1853 * being hovered over.
1854 */
1855 onDragOver: function(e, id) { /* override this */ },
1857 /**
1858 * Code that executes immediately before the onDragOut event
1859 * @method b4DragOut
1860 * @private
1861 */
1862 b4DragOut: function(e) { },
1864 /**
1865 * Abstract method called when we are no longer hovering over an element
1866 * @method onDragOut
1867 * @param {Event} e the mousemove event
1868 * @param {String|DragDrop[]} id In POINT mode, the element
1869 * id this was hovering over. In INTERSECT mode, an array of dd items
1870 * that the mouse is no longer over.
1871 */
1872 onDragOut: function(e, id) { /* override this */ },
1874 /**
1875 * Code that executes immediately before the onDragDrop event
1876 * @method b4DragDrop
1877 * @private
1878 */
1879 b4DragDrop: function(e) { },
1881 /**
1882 * Abstract method called when this item is dropped on another DragDrop
1883 * obj
1884 * @method onDragDrop
1885 * @param {Event} e the mouseup event
1886 * @param {String|DragDrop[]} id In POINT mode, the element
1887 * id this was dropped on. In INTERSECT mode, an array of dd items this
1888 * was dropped on.
1889 */
1890 onDragDrop: function(e, id) { /* override this */ },
1892 /**
1893 * Abstract method called when this item is dropped on an area with no
1894 * drop target
1895 * @method onInvalidDrop
1896 * @param {Event} e the mouseup event
1897 */
1898 onInvalidDrop: function(e) { /* override this */ },
1900 /**
1901 * Code that executes immediately before the endDrag event
1902 * @method b4EndDrag
1903 * @private
1904 */
1905 b4EndDrag: function(e) { },
1907 /**
1908 * Fired when we are done dragging the object
1909 * @method endDrag
1910 * @param {Event} e the mouseup event
1911 */
1912 endDrag: function(e) { /* override this */ },
1914 /**
1915 * Code executed immediately before the onMouseDown event
1916 * @method b4MouseDown
1917 * @param {Event} e the mousedown event
1918 * @private
1919 */
1920 b4MouseDown: function(e) { },
1922 /**
1923 * Event handler that fires when a drag/drop obj gets a mousedown
1924 * @method onMouseDown
1925 * @param {Event} e the mousedown event
1926 */
1927 onMouseDown: function(e) { /* override this */ },
1929 /**
1930 * Event handler that fires when a drag/drop obj gets a mouseup
1931 * @method onMouseUp
1932 * @param {Event} e the mouseup event
1933 */
1934 onMouseUp: function(e) { /* override this */ },
1936 /**
1937 * Override the onAvailable method to do what is needed after the initial
1938 * position was determined.
1939 * @method onAvailable
1940 */
1941 onAvailable: function () {
1942 //this.logger.log("onAvailable (base)");
1943 },
1945 /**
1946 * Returns a reference to the linked element
1947 * @method getEl
1948 * @return {HTMLElement} the html element
1949 */
1950 getEl: function() {
1951 if (!this._domRef) {
1952 this._domRef = Dom.get(this.id);
1953 }
1955 return this._domRef;
1956 },
1958 /**
1959 * Returns a reference to the actual element to drag. By default this is
1960 * the same as the html element, but it can be assigned to another
1961 * element. An example of this can be found in YAHOO.util.DDProxy
1962 * @method getDragEl
1963 * @return {HTMLElement} the html element
1964 */
1965 getDragEl: function() {
1966 return Dom.get(this.dragElId);
1967 },
1969 /**
1970 * Sets up the DragDrop object. Must be called in the constructor of any
1971 * YAHOO.util.DragDrop subclass
1972 * @method init
1973 * @param id the id of the linked element
1974 * @param {String} sGroup the group of related items
1975 * @param {object} config configuration attributes
1976 */
1977 init: function(id, sGroup, config) {
1978 this.initTarget(id, sGroup, config);
1979 Event.on(this._domRef || this.id, "mousedown",
1980 this.handleMouseDown, this, true);
1981 // Event.on(this.id, "selectstart", Event.preventDefault);
1982 },
1984 /**
1985 * Initializes Targeting functionality only... the object does not
1986 * get a mousedown handler.
1987 * @method initTarget
1988 * @param id the id of the linked element
1989 * @param {String} sGroup the group of related items
1990 * @param {object} config configuration attributes
1991 */
1992 initTarget: function(id, sGroup, config) {
1994 // configuration attributes
1995 this.config = config || {};
1997 // create a local reference to the drag and drop manager
1998 this.DDM = YAHOO.util.DDM;
2000 // initialize the groups object
2001 this.groups = {};
2003 // assume that we have an element reference instead of an id if the
2004 // parameter is not a string
2005 if (typeof id !== "string") {
2006 YAHOO.log("id is not a string, assuming it is an HTMLElement");
2007 this._domRef = id;
2008 id = Dom.generateId(id);
2009 }
2011 // set the id
2012 this.id = id;
2014 // add to an interaction group
2015 this.addToGroup((sGroup) ? sGroup : "default");
2017 // We don't want to register this as the handle with the manager
2018 // so we just set the id rather than calling the setter.
2019 this.handleElId = id;
2021 Event.onAvailable(id, this.handleOnAvailable, this, true);
2023 // create a logger instance
2024 this.logger = (YAHOO.widget.LogWriter) ?
2025 new YAHOO.widget.LogWriter(this.toString()) : YAHOO;
2027 // the linked element is the element that gets dragged by default
2028 this.setDragElId(id);
2030 // by default, clicked anchors will not start drag operations.
2031 // @TODO what else should be here? Probably form fields.
2032 this.invalidHandleTypes = { A: "A" };
2033 this.invalidHandleIds = {};
2034 this.invalidHandleClasses = [];
2036 this.applyConfig();
2037 },
2039 /**
2040 * Applies the configuration parameters that were passed into the constructor.
2041 * This is supposed to happen at each level through the inheritance chain. So
2042 * a DDProxy implentation will execute apply config on DDProxy, DD, and
2043 * DragDrop in order to get all of the parameters that are available in
2044 * each object.
2045 * @method applyConfig
2046 */
2047 applyConfig: function() {
2049 // configurable properties:
2050 // padding, isTarget, maintainOffset, primaryButtonOnly
2051 this.padding = this.config.padding || [0, 0, 0, 0];
2052 this.isTarget = (this.config.isTarget !== false);
2053 this.maintainOffset = (this.config.maintainOffset);
2054 this.primaryButtonOnly = (this.config.primaryButtonOnly !== false);
2056 },
2058 /**
2059 * Executed when the linked element is available
2060 * @method handleOnAvailable
2061 * @private
2062 */
2063 handleOnAvailable: function() {
2064 //this.logger.log("handleOnAvailable");
2065 this.available = true;
2066 this.resetConstraints();
2067 this.onAvailable();
2068 },
2070 /**
2071 * Configures the padding for the target zone in px. Effectively expands
2072 * (or reduces) the virtual object size for targeting calculations.
2073 * Supports css-style shorthand; if only one parameter is passed, all sides
2074 * will have that padding, and if only two are passed, the top and bottom
2075 * will have the first param, the left and right the second.
2076 * @method setPadding
2077 * @param {int} iTop Top pad
2078 * @param {int} iRight Right pad
2079 * @param {int} iBot Bot pad
2080 * @param {int} iLeft Left pad
2081 */
2082 setPadding: function(iTop, iRight, iBot, iLeft) {
2083 // this.padding = [iLeft, iRight, iTop, iBot];
2084 if (!iRight && 0 !== iRight) {
2085 this.padding = [iTop, iTop, iTop, iTop];
2086 } else if (!iBot && 0 !== iBot) {
2087 this.padding = [iTop, iRight, iTop, iRight];
2088 } else {
2089 this.padding = [iTop, iRight, iBot, iLeft];
2090 }
2091 },
2093 /**
2094 * Stores the initial placement of the linked element.
2095 * @method setInitialPosition
2096 * @param {int} diffX the X offset, default 0
2097 * @param {int} diffY the Y offset, default 0
2098 * @private
2099 */
2100 setInitPosition: function(diffX, diffY) {
2101 var el = this.getEl();
2103 if (!this.DDM.verifyEl(el)) {
2104 this.logger.log(this.id + " element is broken");
2105 return;
2106 }
2108 var dx = diffX || 0;
2109 var dy = diffY || 0;
2111 var p = Dom.getXY( el );
2113 this.initPageX = p[0] - dx;
2114 this.initPageY = p[1] - dy;
2116 this.lastPageX = p[0];
2117 this.lastPageY = p[1];
2119 this.logger.log(this.id + " initial position: " + this.initPageX +
2120 ", " + this.initPageY);
2123 this.setStartPosition(p);
2124 },
2126 /**
2127 * Sets the start position of the element. This is set when the obj
2128 * is initialized, the reset when a drag is started.
2129 * @method setStartPosition
2130 * @param pos current position (from previous lookup)
2131 * @private
2132 */
2133 setStartPosition: function(pos) {
2134 var p = pos || Dom.getXY(this.getEl());
2136 this.deltaSetXY = null;
2138 this.startPageX = p[0];
2139 this.startPageY = p[1];
2140 },
2142 /**
2143 * Add this instance to a group of related drag/drop objects. All
2144 * instances belong to at least one group, and can belong to as many
2145 * groups as needed.
2146 * @method addToGroup
2147 * @param sGroup {string} the name of the group
2148 */
2149 addToGroup: function(sGroup) {
2150 this.groups[sGroup] = true;
2151 this.DDM.regDragDrop(this, sGroup);
2152 },
2154 /**
2155 * Remove's this instance from the supplied interaction group
2156 * @method removeFromGroup
2157 * @param {string} sGroup The group to drop
2158 */
2159 removeFromGroup: function(sGroup) {
2160 this.logger.log("Removing from group: " + sGroup);
2161 if (this.groups[sGroup]) {
2162 delete this.groups[sGroup];
2163 }
2165 this.DDM.removeDDFromGroup(this, sGroup);
2166 },
2168 /**
2169 * Allows you to specify that an element other than the linked element
2170 * will be moved with the cursor during a drag
2171 * @method setDragElId
2172 * @param id {string} the id of the element that will be used to initiate the drag
2173 */
2174 setDragElId: function(id) {
2175 this.dragElId = id;
2176 },
2178 /**
2179 * Allows you to specify a child of the linked element that should be
2180 * used to initiate the drag operation. An example of this would be if
2181 * you have a content div with text and links. Clicking anywhere in the
2182 * content area would normally start the drag operation. Use this method
2183 * to specify that an element inside of the content div is the element
2184 * that starts the drag operation.
2185 * @method setHandleElId
2186 * @param id {string} the id of the element that will be used to
2187 * initiate the drag.
2188 */
2189 setHandleElId: function(id) {
2190 if (typeof id !== "string") {
2191 YAHOO.log("id is not a string, assuming it is an HTMLElement");
2192 id = Dom.generateId(id);
2193 }
2194 this.handleElId = id;
2195 this.DDM.regHandle(this.id, id);
2196 },
2198 /**
2199 * Allows you to set an element outside of the linked element as a drag
2200 * handle
2201 * @method setOuterHandleElId
2202 * @param id the id of the element that will be used to initiate the drag
2203 */
2204 setOuterHandleElId: function(id) {
2205 if (typeof id !== "string") {
2206 YAHOO.log("id is not a string, assuming it is an HTMLElement");
2207 id = Dom.generateId(id);
2208 }
2209 this.logger.log("Adding outer handle event: " + id);
2210 Event.on(id, "mousedown",
2211 this.handleMouseDown, this, true);
2212 this.setHandleElId(id);
2214 this.hasOuterHandles = true;
2215 },
2217 /**
2218 * Remove all drag and drop hooks for this element
2219 * @method unreg
2220 */
2221 unreg: function() {
2222 this.logger.log("DragDrop obj cleanup " + this.id);
2223 Event.removeListener(this.id, "mousedown",
2224 this.handleMouseDown);
2225 this._domRef = null;
2226 this.DDM._remove(this);
2227 },
2229 /**
2230 * Returns true if this instance is locked, or the drag drop mgr is locked
2231 * (meaning that all drag/drop is disabled on the page.)
2232 * @method isLocked
2233 * @return {boolean} true if this obj or all drag/drop is locked, else
2234 * false
2235 */
2236 isLocked: function() {
2237 return (this.DDM.isLocked() || this.locked);
2238 },
2240 /**
2241 * Fired when this object is clicked
2242 * @method handleMouseDown
2243 * @param {Event} e
2244 * @param {YAHOO.util.DragDrop} oDD the clicked dd object (this dd obj)
2245 * @private
2246 */
2247 handleMouseDown: function(e, oDD) {
2249 var button = e.which || e.button;
2250 this.logger.log("button: " + button);
2252 if (this.primaryButtonOnly && button > 1) {
2253 this.logger.log("Mousedown was not produced by the primary button");
2254 return;
2255 }
2257 if (this.isLocked()) {
2258 this.logger.log("Drag and drop is disabled, aborting");
2259 return;
2260 }
2262 this.logger.log("mousedown " + this.id);
2264 this.logger.log("firing onMouseDown events");
2266 // firing the mousedown events prior to calculating positions
2267 this.b4MouseDown(e);
2268 this.onMouseDown(e);
2270 this.DDM.refreshCache(this.groups);
2271 // var self = this;
2272 // setTimeout( function() { self.DDM.refreshCache(self.groups); }, 0);
2274 // Only process the event if we really clicked within the linked
2275 // element. The reason we make this check is that in the case that
2276 // another element was moved between the clicked element and the
2277 // cursor in the time between the mousedown and mouseup events. When
2278 // this happens, the element gets the next mousedown event
2279 // regardless of where on the screen it happened.
2280 var pt = new YAHOO.util.Point(Event.getPageX(e), Event.getPageY(e));
2281 if (!this.hasOuterHandles && !this.DDM.isOverTarget(pt, this) ) {
2282 this.logger.log("Click was not over the element: " + this.id);
2283 } else {
2284 if (this.clickValidator(e)) {
2286 this.logger.log("click was a valid handle");
2288 // set the initial element position
2289 this.setStartPosition();
2291 // start tracking mousemove distance and mousedown time to
2292 // determine when to start the actual drag
2293 this.DDM.handleMouseDown(e, this);
2295 // this mousedown is mine
2296 this.DDM.stopEvent(e);
2297 } else {
2299 this.logger.log("clickValidator returned false, drag not initiated");
2301 }
2302 }
2303 },
2305 clickValidator: function(e) {
2306 var target = Event.getTarget(e);
2307 return ( this.isValidHandleChild(target) &&
2308 (this.id == this.handleElId ||
2309 this.DDM.handleWasClicked(target, this.id)) );
2310 },
2312 /**
2313 * Finds the location the element should be placed if we want to move
2314 * it to where the mouse location less the click offset would place us.
2315 * @method getTargetCoord
2316 * @param {int} iPageX the X coordinate of the click
2317 * @param {int} iPageY the Y coordinate of the click
2318 * @return an object that contains the coordinates (Object.x and Object.y)
2319 * @private
2320 */
2321 getTargetCoord: function(iPageX, iPageY) {
2323 // this.logger.log("getTargetCoord: " + iPageX + ", " + iPageY);
2325 var x = iPageX - this.deltaX;
2326 var y = iPageY - this.deltaY;
2328 if (this.constrainX) {
2329 if (x < this.minX) { x = this.minX; }
2330 if (x > this.maxX) { x = this.maxX; }
2331 }
2333 if (this.constrainY) {
2334 if (y < this.minY) { y = this.minY; }
2335 if (y > this.maxY) { y = this.maxY; }
2336 }
2338 x = this.getTick(x, this.xTicks);
2339 y = this.getTick(y, this.yTicks);
2341 // this.logger.log("getTargetCoord " +
2342 // " iPageX: " + iPageX +
2343 // " iPageY: " + iPageY +
2344 // " x: " + x + ", y: " + y);
2346 return {x:x, y:y};
2347 },
2349 /**
2350 * Allows you to specify a tag name that should not start a drag operation
2351 * when clicked. This is designed to facilitate embedding links within a
2352 * drag handle that do something other than start the drag.
2353 * @method addInvalidHandleType
2354 * @param {string} tagName the type of element to exclude
2355 */
2356 addInvalidHandleType: function(tagName) {
2357 var type = tagName.toUpperCase();
2358 this.invalidHandleTypes[type] = type;
2359 },
2361 /**
2362 * Lets you to specify an element id for a child of a drag handle
2363 * that should not initiate a drag
2364 * @method addInvalidHandleId
2365 * @param {string} id the element id of the element you wish to ignore
2366 */
2367 addInvalidHandleId: function(id) {
2368 if (typeof id !== "string") {
2369 YAHOO.log("id is not a string, assuming it is an HTMLElement");
2370 id = Dom.generateId(id);
2371 }
2372 this.invalidHandleIds[id] = id;
2373 },
2376 /**
2377 * Lets you specify a css class of elements that will not initiate a drag
2378 * @method addInvalidHandleClass
2379 * @param {string} cssClass the class of the elements you wish to ignore
2380 */
2381 addInvalidHandleClass: function(cssClass) {
2382 this.invalidHandleClasses.push(cssClass);
2383 },
2385 /**
2386 * Unsets an excluded tag name set by addInvalidHandleType
2387 * @method removeInvalidHandleType
2388 * @param {string} tagName the type of element to unexclude
2389 */
2390 removeInvalidHandleType: function(tagName) {
2391 var type = tagName.toUpperCase();
2392 // this.invalidHandleTypes[type] = null;
2393 delete this.invalidHandleTypes[type];
2394 },
2396 /**
2397 * Unsets an invalid handle id
2398 * @method removeInvalidHandleId
2399 * @param {string} id the id of the element to re-enable
2400 */
2401 removeInvalidHandleId: function(id) {
2402 if (typeof id !== "string") {
2403 YAHOO.log("id is not a string, assuming it is an HTMLElement");
2404 id = Dom.generateId(id);
2405 }
2406 delete this.invalidHandleIds[id];
2407 },
2409 /**
2410 * Unsets an invalid css class
2411 * @method removeInvalidHandleClass
2412 * @param {string} cssClass the class of the element(s) you wish to
2413 * re-enable
2414 */
2415 removeInvalidHandleClass: function(cssClass) {
2416 for (var i=0, len=this.invalidHandleClasses.length; i<len; ++i) {
2417 if (this.invalidHandleClasses[i] == cssClass) {
2418 delete this.invalidHandleClasses[i];
2419 }
2420 }
2421 },
2423 /**
2424 * Checks the tag exclusion list to see if this click should be ignored
2425 * @method isValidHandleChild
2426 * @param {HTMLElement} node the HTMLElement to evaluate
2427 * @return {boolean} true if this is a valid tag type, false if not
2428 */
2429 isValidHandleChild: function(node) {
2431 var valid = true;
2432 // var n = (node.nodeName == "#text") ? node.parentNode : node;
2433 var nodeName;
2434 try {
2435 nodeName = node.nodeName.toUpperCase();
2436 } catch(e) {
2437 nodeName = node.nodeName;
2438 }
2439 valid = valid && !this.invalidHandleTypes[nodeName];
2440 valid = valid && !this.invalidHandleIds[node.id];
2442 for (var i=0, len=this.invalidHandleClasses.length; valid && i<len; ++i) {
2443 valid = !Dom.hasClass(node, this.invalidHandleClasses[i]);
2444 }
2446 this.logger.log("Valid handle? ... " + valid);
2448 return valid;
2450 },
2452 /**
2453 * Create the array of horizontal tick marks if an interval was specified
2454 * in setXConstraint().
2455 * @method setXTicks
2456 * @private
2457 */
2458 setXTicks: function(iStartX, iTickSize) {
2459 this.xTicks = [];
2460 this.xTickSize = iTickSize;
2462 var tickMap = {};
2464 for (var i = this.initPageX; i >= this.minX; i = i - iTickSize) {
2465 if (!tickMap[i]) {
2466 this.xTicks[this.xTicks.length] = i;
2467 tickMap[i] = true;
2468 }
2469 }
2471 for (i = this.initPageX; i <= this.maxX; i = i + iTickSize) {
2472 if (!tickMap[i]) {
2473 this.xTicks[this.xTicks.length] = i;
2474 tickMap[i] = true;
2475 }
2476 }
2478 this.xTicks.sort(this.DDM.numericSort) ;
2479 this.logger.log("xTicks: " + this.xTicks.join());
2480 },
2482 /**
2483 * Create the array of vertical tick marks if an interval was specified in
2484 * setYConstraint().
2485 * @method setYTicks
2486 * @private
2487 */
2488 setYTicks: function(iStartY, iTickSize) {
2489 // this.logger.log("setYTicks: " + iStartY + ", " + iTickSize
2490 // + ", " + this.initPageY + ", " + this.minY + ", " + this.maxY );
2491 this.yTicks = [];
2492 this.yTickSize = iTickSize;
2494 var tickMap = {};
2496 for (var i = this.initPageY; i >= this.minY; i = i - iTickSize) {
2497 if (!tickMap[i]) {
2498 this.yTicks[this.yTicks.length] = i;
2499 tickMap[i] = true;
2500 }
2501 }
2503 for (i = this.initPageY; i <= this.maxY; i = i + iTickSize) {
2504 if (!tickMap[i]) {
2505 this.yTicks[this.yTicks.length] = i;
2506 tickMap[i] = true;
2507 }
2508 }
2510 this.yTicks.sort(this.DDM.numericSort) ;
2511 this.logger.log("yTicks: " + this.yTicks.join());
2512 },
2514 /**
2515 * By default, the element can be dragged any place on the screen. Use
2516 * this method to limit the horizontal travel of the element. Pass in
2517 * 0,0 for the parameters if you want to lock the drag to the y axis.
2518 * @method setXConstraint
2519 * @param {int} iLeft the number of pixels the element can move to the left
2520 * @param {int} iRight the number of pixels the element can move to the
2521 * right
2522 * @param {int} iTickSize optional parameter for specifying that the
2523 * element
2524 * should move iTickSize pixels at a time.
2525 */
2526 setXConstraint: function(iLeft, iRight, iTickSize) {
2527 this.leftConstraint = parseInt(iLeft, 10);
2528 this.rightConstraint = parseInt(iRight, 10);
2530 this.minX = this.initPageX - this.leftConstraint;
2531 this.maxX = this.initPageX + this.rightConstraint;
2532 if (iTickSize) { this.setXTicks(this.initPageX, iTickSize); }
2534 this.constrainX = true;
2535 this.logger.log("initPageX:" + this.initPageX + " minX:" + this.minX +
2536 " maxX:" + this.maxX);
2537 },
2539 /**
2540 * Clears any constraints applied to this instance. Also clears ticks
2541 * since they can't exist independent of a constraint at this time.
2542 * @method clearConstraints
2543 */
2544 clearConstraints: function() {
2545 this.logger.log("Clearing constraints");
2546 this.constrainX = false;
2547 this.constrainY = false;
2548 this.clearTicks();
2549 },
2551 /**
2552 * Clears any tick interval defined for this instance
2553 * @method clearTicks
2554 */
2555 clearTicks: function() {
2556 this.logger.log("Clearing ticks");
2557 this.xTicks = null;
2558 this.yTicks = null;
2559 this.xTickSize = 0;
2560 this.yTickSize = 0;
2561 },
2563 /**
2564 * By default, the element can be dragged any place on the screen. Set
2565 * this to limit the vertical travel of the element. Pass in 0,0 for the
2566 * parameters if you want to lock the drag to the x axis.
2567 * @method setYConstraint
2568 * @param {int} iUp the number of pixels the element can move up
2569 * @param {int} iDown the number of pixels the element can move down
2570 * @param {int} iTickSize optional parameter for specifying that the
2571 * element should move iTickSize pixels at a time.
2572 */
2573 setYConstraint: function(iUp, iDown, iTickSize) {
2574 this.logger.log("setYConstraint: " + iUp + "," + iDown + "," + iTickSize);
2575 this.topConstraint = parseInt(iUp, 10);
2576 this.bottomConstraint = parseInt(iDown, 10);
2578 this.minY = this.initPageY - this.topConstraint;
2579 this.maxY = this.initPageY + this.bottomConstraint;
2580 if (iTickSize) { this.setYTicks(this.initPageY, iTickSize); }
2582 this.constrainY = true;
2584 this.logger.log("initPageY:" + this.initPageY + " minY:" + this.minY +
2585 " maxY:" + this.maxY);
2586 },
2588 /**
2589 * resetConstraints must be called if you manually reposition a dd element.
2590 * @method resetConstraints
2591 */
2592 resetConstraints: function() {
2594 //this.logger.log("resetConstraints");
2596 // Maintain offsets if necessary
2597 if (this.initPageX || this.initPageX === 0) {
2598 //this.logger.log("init pagexy: " + this.initPageX + ", " +
2599 //this.initPageY);
2600 //this.logger.log("last pagexy: " + this.lastPageX + ", " +
2601 //this.lastPageY);
2602 // figure out how much this thing has moved
2603 var dx = (this.maintainOffset) ? this.lastPageX - this.initPageX : 0;
2604 var dy = (this.maintainOffset) ? this.lastPageY - this.initPageY : 0;
2606 this.setInitPosition(dx, dy);
2608 // This is the first time we have detected the element's position
2609 } else {
2610 this.setInitPosition();
2611 }
2613 if (this.constrainX) {
2614 this.setXConstraint( this.leftConstraint,
2615 this.rightConstraint,
2616 this.xTickSize );
2617 }
2619 if (this.constrainY) {
2620 this.setYConstraint( this.topConstraint,
2621 this.bottomConstraint,
2622 this.yTickSize );
2623 }
2624 },
2626 /**
2627 * Normally the drag element is moved pixel by pixel, but we can specify
2628 * that it move a number of pixels at a time. This method resolves the
2629 * location when we have it set up like this.
2630 * @method getTick
2631 * @param {int} val where we want to place the object
2632 * @param {int[]} tickArray sorted array of valid points
2633 * @return {int} the closest tick
2634 * @private
2635 */
2636 getTick: function(val, tickArray) {
2638 if (!tickArray) {
2639 // If tick interval is not defined, it is effectively 1 pixel,
2640 // so we return the value passed to us.
2641 return val;
2642 } else if (tickArray[0] >= val) {
2643 // The value is lower than the first tick, so we return the first
2644 // tick.
2645 return tickArray[0];
2646 } else {
2647 for (var i=0, len=tickArray.length; i<len; ++i) {
2648 var next = i + 1;
2649 if (tickArray[next] && tickArray[next] >= val) {
2650 var diff1 = val - tickArray[i];
2651 var diff2 = tickArray[next] - val;
2652 return (diff2 > diff1) ? tickArray[i] : tickArray[next];
2653 }
2654 }
2656 // The value is larger than the last tick, so we return the last
2657 // tick.
2658 return tickArray[tickArray.length - 1];
2659 }
2660 },
2662 /**
2663 * toString method
2664 * @method toString
2665 * @return {string} string representation of the dd obj
2666 */
2667 toString: function() {
2668 return ("DragDrop " + this.id);
2669 }
2671 };
2673 })();
2674 /**
2675 * A DragDrop implementation where the linked element follows the
2676 * mouse cursor during a drag.
2677 * @class DD
2678 * @extends YAHOO.util.DragDrop
2679 * @constructor
2680 * @param {String} id the id of the linked element
2681 * @param {String} sGroup the group of related DragDrop items
2682 * @param {object} config an object containing configurable attributes
2683 * Valid properties for DD:
2684 * scroll
2685 */
2686 YAHOO.util.DD = function(id, sGroup, config) {
2687 if (id) {
2688 this.init(id, sGroup, config);
2689 }
2690 };
2692 YAHOO.extend(YAHOO.util.DD, YAHOO.util.DragDrop, {
2694 /**
2695 * When set to true, the utility automatically tries to scroll the browser
2696 * window wehn a drag and drop element is dragged near the viewport boundary.
2697 * Defaults to true.
2698 * @property scroll
2699 * @type boolean
2700 */
2701 scroll: true,
2703 /**
2704 * Sets the pointer offset to the distance between the linked element's top
2705 * left corner and the location the element was clicked
2706 * @method autoOffset
2707 * @param {int} iPageX the X coordinate of the click
2708 * @param {int} iPageY the Y coordinate of the click
2709 */
2710 autoOffset: function(iPageX, iPageY) {
2711 var x = iPageX - this.startPageX;
2712 var y = iPageY - this.startPageY;
2713 this.setDelta(x, y);
2714 // this.logger.log("autoOffset el pos: " + aCoord + ", delta: " + x + "," + y);
2715 },
2717 /**
2718 * Sets the pointer offset. You can call this directly to force the
2719 * offset to be in a particular location (e.g., pass in 0,0 to set it
2720 * to the center of the object, as done in YAHOO.widget.Slider)
2721 * @method setDelta
2722 * @param {int} iDeltaX the distance from the left
2723 * @param {int} iDeltaY the distance from the top
2724 */
2725 setDelta: function(iDeltaX, iDeltaY) {
2726 this.deltaX = iDeltaX;
2727 this.deltaY = iDeltaY;
2728 this.logger.log("deltaX:" + this.deltaX + ", deltaY:" + this.deltaY);
2729 },
2731 /**
2732 * Sets the drag element to the location of the mousedown or click event,
2733 * maintaining the cursor location relative to the location on the element
2734 * that was clicked. Override this if you want to place the element in a
2735 * location other than where the cursor is.
2736 * @method setDragElPos
2737 * @param {int} iPageX the X coordinate of the mousedown or drag event
2738 * @param {int} iPageY the Y coordinate of the mousedown or drag event
2739 */
2740 setDragElPos: function(iPageX, iPageY) {
2741 // the first time we do this, we are going to check to make sure
2742 // the element has css positioning
2744 var el = this.getDragEl();
2745 this.alignElWithMouse(el, iPageX, iPageY);
2746 },
2748 /**
2749 * Sets the element to the location of the mousedown or click event,
2750 * maintaining the cursor location relative to the location on the element
2751 * that was clicked. Override this if you want to place the element in a
2752 * location other than where the cursor is.
2753 * @method alignElWithMouse
2754 * @param {HTMLElement} el the element to move
2755 * @param {int} iPageX the X coordinate of the mousedown or drag event
2756 * @param {int} iPageY the Y coordinate of the mousedown or drag event
2757 */
2758 alignElWithMouse: function(el, iPageX, iPageY) {
2759 var oCoord = this.getTargetCoord(iPageX, iPageY);
2760 // this.logger.log("****alignElWithMouse : " + el.id + ", " + aCoord + ", " + el.style.display);
2762 if (!this.deltaSetXY) {
2763 var aCoord = [oCoord.x, oCoord.y];
2764 YAHOO.util.Dom.setXY(el, aCoord);
2765 var newLeft = parseInt( YAHOO.util.Dom.getStyle(el, "left"), 10 );
2766 var newTop = parseInt( YAHOO.util.Dom.getStyle(el, "top" ), 10 );
2768 this.deltaSetXY = [ newLeft - oCoord.x, newTop - oCoord.y ];
2769 } else {
2770 YAHOO.util.Dom.setStyle(el, "left", (oCoord.x + this.deltaSetXY[0]) + "px");
2771 YAHOO.util.Dom.setStyle(el, "top", (oCoord.y + this.deltaSetXY[1]) + "px");
2772 }
2774 this.cachePosition(oCoord.x, oCoord.y);
2775 this.autoScroll(oCoord.x, oCoord.y, el.offsetHeight, el.offsetWidth);
2776 },
2778 /**
2779 * Saves the most recent position so that we can reset the constraints and
2780 * tick marks on-demand. We need to know this so that we can calculate the
2781 * number of pixels the element is offset from its original position.
2782 * @method cachePosition
2783 * @param iPageX the current x position (optional, this just makes it so we
2784 * don't have to look it up again)
2785 * @param iPageY the current y position (optional, this just makes it so we
2786 * don't have to look it up again)
2787 */
2788 cachePosition: function(iPageX, iPageY) {
2789 if (iPageX) {
2790 this.lastPageX = iPageX;
2791 this.lastPageY = iPageY;
2792 } else {
2793 var aCoord = YAHOO.util.Dom.getXY(this.getEl());
2794 this.lastPageX = aCoord[0];
2795 this.lastPageY = aCoord[1];
2796 }
2797 },
2799 /**
2800 * Auto-scroll the window if the dragged object has been moved beyond the
2801 * visible window boundary.
2802 * @method autoScroll
2803 * @param {int} x the drag element's x position
2804 * @param {int} y the drag element's y position
2805 * @param {int} h the height of the drag element
2806 * @param {int} w the width of the drag element
2807 * @private
2808 */
2809 autoScroll: function(x, y, h, w) {
2811 if (this.scroll) {
2812 // The client height
2813 var clientH = this.DDM.getClientHeight();
2815 // The client width
2816 var clientW = this.DDM.getClientWidth();
2818 // The amt scrolled down
2819 var st = this.DDM.getScrollTop();
2821 // The amt scrolled right
2822 var sl = this.DDM.getScrollLeft();
2824 // Location of the bottom of the element
2825 var bot = h + y;
2827 // Location of the right of the element
2828 var right = w + x;
2830 // The distance from the cursor to the bottom of the visible area,
2831 // adjusted so that we don't scroll if the cursor is beyond the
2832 // element drag constraints
2833 var toBot = (clientH + st - y - this.deltaY);
2835 // The distance from the cursor to the right of the visible area
2836 var toRight = (clientW + sl - x - this.deltaX);
2838 // this.logger.log( " x: " + x + " y: " + y + " h: " + h +
2839 // " clientH: " + clientH + " clientW: " + clientW +
2840 // " st: " + st + " sl: " + sl + " bot: " + bot +
2841 // " right: " + right + " toBot: " + toBot + " toRight: " + toRight);
2843 // How close to the edge the cursor must be before we scroll
2844 // var thresh = (document.all) ? 100 : 40;
2845 var thresh = 40;
2847 // How many pixels to scroll per autoscroll op. This helps to reduce
2848 // clunky scrolling. IE is more sensitive about this ... it needs this
2849 // value to be higher.
2850 var scrAmt = (document.all) ? 80 : 30;
2852 // Scroll down if we are near the bottom of the visible page and the
2853 // obj extends below the crease
2854 if ( bot > clientH && toBot < thresh ) {
2855 window.scrollTo(sl, st + scrAmt);
2856 }
2858 // Scroll up if the window is scrolled down and the top of the object
2859 // goes above the top border
2860 if ( y < st && st > 0 && y - st < thresh ) {
2861 window.scrollTo(sl, st - scrAmt);
2862 }
2864 // Scroll right if the obj is beyond the right border and the cursor is
2865 // near the border.
2866 if ( right > clientW && toRight < thresh ) {
2867 window.scrollTo(sl + scrAmt, st);
2868 }
2870 // Scroll left if the window has been scrolled to the right and the obj
2871 // extends past the left border
2872 if ( x < sl && sl > 0 && x - sl < thresh ) {
2873 window.scrollTo(sl - scrAmt, st);
2874 }
2875 }
2876 },
2878 /*
2879 * Sets up config options specific to this class. Overrides
2880 * YAHOO.util.DragDrop, but all versions of this method through the
2881 * inheritance chain are called
2882 */
2883 applyConfig: function() {
2884 YAHOO.util.DD.superclass.applyConfig.call(this);
2885 this.scroll = (this.config.scroll !== false);
2886 },
2888 /*
2889 * Event that fires prior to the onMouseDown event. Overrides
2890 * YAHOO.util.DragDrop.
2891 */
2892 b4MouseDown: function(e) {
2893 this.setStartPosition();
2894 // this.resetConstraints();
2895 this.autoOffset(YAHOO.util.Event.getPageX(e),
2896 YAHOO.util.Event.getPageY(e));
2897 },
2899 /*
2900 * Event that fires prior to the onDrag event. Overrides
2901 * YAHOO.util.DragDrop.
2902 */
2903 b4Drag: function(e) {
2904 this.setDragElPos(YAHOO.util.Event.getPageX(e),
2905 YAHOO.util.Event.getPageY(e));
2906 },
2908 toString: function() {
2909 return ("DD " + this.id);
2910 }
2912 //////////////////////////////////////////////////////////////////////////
2913 // Debugging ygDragDrop events that can be overridden
2914 //////////////////////////////////////////////////////////////////////////
2915 /*
2916 startDrag: function(x, y) {
2917 this.logger.log(this.id.toString() + " startDrag");
2918 },
2920 onDrag: function(e) {
2921 this.logger.log(this.id.toString() + " onDrag");
2922 },
2924 onDragEnter: function(e, id) {
2925 this.logger.log(this.id.toString() + " onDragEnter: " + id);
2926 },
2928 onDragOver: function(e, id) {
2929 this.logger.log(this.id.toString() + " onDragOver: " + id);
2930 },
2932 onDragOut: function(e, id) {
2933 this.logger.log(this.id.toString() + " onDragOut: " + id);
2934 },
2936 onDragDrop: function(e, id) {
2937 this.logger.log(this.id.toString() + " onDragDrop: " + id);
2938 },
2940 endDrag: function(e) {
2941 this.logger.log(this.id.toString() + " endDrag");
2942 }
2944 */
2946 });
2947 /**
2948 * A DragDrop implementation that inserts an empty, bordered div into
2949 * the document that follows the cursor during drag operations. At the time of
2950 * the click, the frame div is resized to the dimensions of the linked html
2951 * element, and moved to the exact location of the linked element.
2952 *
2953 * References to the "frame" element refer to the single proxy element that
2954 * was created to be dragged in place of all DDProxy elements on the
2955 * page.
2956 *
2957 * @class DDProxy
2958 * @extends YAHOO.util.DD
2959 * @constructor
2960 * @param {String} id the id of the linked html element
2961 * @param {String} sGroup the group of related DragDrop objects
2962 * @param {object} config an object containing configurable attributes
2963 * Valid properties for DDProxy in addition to those in DragDrop:
2964 * resizeFrame, centerFrame, dragElId
2965 */
2966 YAHOO.util.DDProxy = function(id, sGroup, config) {
2967 if (id) {
2968 this.init(id, sGroup, config);
2969 this.initFrame();
2970 }
2971 };
2973 /**
2974 * The default drag frame div id
2975 * @property YAHOO.util.DDProxy.dragElId
2976 * @type String
2977 * @static
2978 */
2979 YAHOO.util.DDProxy.dragElId = "ygddfdiv";
2981 YAHOO.extend(YAHOO.util.DDProxy, YAHOO.util.DD, {
2983 /**
2984 * By default we resize the drag frame to be the same size as the element
2985 * we want to drag (this is to get the frame effect). We can turn it off
2986 * if we want a different behavior.
2987 * @property resizeFrame
2988 * @type boolean
2989 */
2990 resizeFrame: true,
2992 /**
2993 * By default the frame is positioned exactly where the drag element is, so
2994 * we use the cursor offset provided by YAHOO.util.DD. Another option that works only if
2995 * you do not have constraints on the obj is to have the drag frame centered
2996 * around the cursor. Set centerFrame to true for this effect.
2997 * @property centerFrame
2998 * @type boolean
2999 */
3000 centerFrame: false,
3002 /**
3003 * Creates the proxy element if it does not yet exist
3004 * @method createFrame
3005 */
3006 createFrame: function() {
3007 var self=this, body=document.body;
3009 if (!body || !body.firstChild) {
3010 setTimeout( function() { self.createFrame(); }, 50 );
3011 return;
3012 }
3014 var div=this.getDragEl(), Dom=YAHOO.util.Dom;
3016 if (!div) {
3017 div = document.createElement("div");
3018 div.id = this.dragElId;
3019 var s = div.style;
3021 s.position = "absolute";
3022 s.visibility = "hidden";
3023 s.cursor = "move";
3024 s.border = "2px solid #aaa";
3025 s.zIndex = 999;
3026 s.height = "25px";
3027 s.width = "25px";
3029 var _data = document.createElement('div');
3030 Dom.setStyle(_data, 'height', '100%');
3031 Dom.setStyle(_data, 'width', '100%');
3032 /**
3033 * If the proxy element has no background-color, then it is considered to the "transparent" by Internet Explorer.
3034 * Since it is "transparent" then the events pass through it to the iframe below.
3035 * So creating a "fake" div inside the proxy element and giving it a background-color, then setting it to an
3036 * opacity of 0, it appears to not be there, however IE still thinks that it is so the events never pass through.
3037 */
3038 Dom.setStyle(_data, 'background-color', '#ccc');
3039 Dom.setStyle(_data, 'opacity', '0');
3040 div.appendChild(_data);
3042 // appendChild can blow up IE if invoked prior to the window load event
3043 // while rendering a table. It is possible there are other scenarios
3044 // that would cause this to happen as well.
3045 body.insertBefore(div, body.firstChild);
3046 }
3047 },
3049 /**
3050 * Initialization for the drag frame element. Must be called in the
3051 * constructor of all subclasses
3052 * @method initFrame
3053 */
3054 initFrame: function() {
3055 this.createFrame();
3056 },
3058 applyConfig: function() {
3059 //this.logger.log("DDProxy applyConfig");
3060 YAHOO.util.DDProxy.superclass.applyConfig.call(this);
3062 this.resizeFrame = (this.config.resizeFrame !== false);
3063 this.centerFrame = (this.config.centerFrame);
3064 this.setDragElId(this.config.dragElId || YAHOO.util.DDProxy.dragElId);
3065 },
3067 /**
3068 * Resizes the drag frame to the dimensions of the clicked object, positions
3069 * it over the object, and finally displays it
3070 * @method showFrame
3071 * @param {int} iPageX X click position
3072 * @param {int} iPageY Y click position
3073 * @private
3074 */
3075 showFrame: function(iPageX, iPageY) {
3076 var el = this.getEl();
3077 var dragEl = this.getDragEl();
3078 var s = dragEl.style;
3080 this._resizeProxy();
3082 if (this.centerFrame) {
3083 this.setDelta( Math.round(parseInt(s.width, 10)/2),
3084 Math.round(parseInt(s.height, 10)/2) );
3085 }
3087 this.setDragElPos(iPageX, iPageY);
3089 YAHOO.util.Dom.setStyle(dragEl, "visibility", "visible");
3090 },
3092 /**
3093 * The proxy is automatically resized to the dimensions of the linked
3094 * element when a drag is initiated, unless resizeFrame is set to false
3095 * @method _resizeProxy
3096 * @private
3097 */
3098 _resizeProxy: function() {
3099 if (this.resizeFrame) {
3100 var DOM = YAHOO.util.Dom;
3101 var el = this.getEl();
3102 var dragEl = this.getDragEl();
3104 var bt = parseInt( DOM.getStyle(dragEl, "borderTopWidth" ), 10);
3105 var br = parseInt( DOM.getStyle(dragEl, "borderRightWidth" ), 10);
3106 var bb = parseInt( DOM.getStyle(dragEl, "borderBottomWidth" ), 10);
3107 var bl = parseInt( DOM.getStyle(dragEl, "borderLeftWidth" ), 10);
3109 if (isNaN(bt)) { bt = 0; }
3110 if (isNaN(br)) { br = 0; }
3111 if (isNaN(bb)) { bb = 0; }
3112 if (isNaN(bl)) { bl = 0; }
3114 this.logger.log("proxy size: " + bt + " " + br + " " + bb + " " + bl);
3116 var newWidth = Math.max(0, el.offsetWidth - br - bl);
3117 var newHeight = Math.max(0, el.offsetHeight - bt - bb);
3119 this.logger.log("Resizing proxy element");
3121 DOM.setStyle( dragEl, "width", newWidth + "px" );
3122 DOM.setStyle( dragEl, "height", newHeight + "px" );
3123 }
3124 },
3126 // overrides YAHOO.util.DragDrop
3127 b4MouseDown: function(e) {
3128 this.setStartPosition();
3129 var x = YAHOO.util.Event.getPageX(e);
3130 var y = YAHOO.util.Event.getPageY(e);
3131 this.autoOffset(x, y);
3133 // This causes the autoscroll code to kick off, which means autoscroll can
3134 // happen prior to the check for a valid drag handle.
3135 // this.setDragElPos(x, y);
3136 },
3138 // overrides YAHOO.util.DragDrop
3139 b4StartDrag: function(x, y) {
3140 // show the drag frame
3141 this.logger.log("start drag show frame, x: " + x + ", y: " + y);
3142 this.showFrame(x, y);
3143 },
3145 // overrides YAHOO.util.DragDrop
3146 b4EndDrag: function(e) {
3147 this.logger.log(this.id + " b4EndDrag");
3148 YAHOO.util.Dom.setStyle(this.getDragEl(), "visibility", "hidden");
3149 },
3151 // overrides YAHOO.util.DragDrop
3152 // By default we try to move the element to the last location of the frame.
3153 // This is so that the default behavior mirrors that of YAHOO.util.DD.
3154 endDrag: function(e) {
3155 var DOM = YAHOO.util.Dom;
3156 this.logger.log(this.id + " endDrag");
3157 var lel = this.getEl();
3158 var del = this.getDragEl();
3160 // Show the drag frame briefly so we can get its position
3161 // del.style.visibility = "";
3162 DOM.setStyle(del, "visibility", "");
3164 // Hide the linked element before the move to get around a Safari
3165 // rendering bug.
3166 //lel.style.visibility = "hidden";
3167 DOM.setStyle(lel, "visibility", "hidden");
3168 YAHOO.util.DDM.moveToEl(lel, del);
3169 //del.style.visibility = "hidden";
3170 DOM.setStyle(del, "visibility", "hidden");
3171 //lel.style.visibility = "";
3172 DOM.setStyle(lel, "visibility", "");
3173 },
3175 toString: function() {
3176 return ("DDProxy " + this.id);
3177 }
3179 });
3180 /**
3181 * A DragDrop implementation that does not move, but can be a drop
3182 * target. You would get the same result by simply omitting implementation
3183 * for the event callbacks, but this way we reduce the processing cost of the
3184 * event listener and the callbacks.
3185 * @class DDTarget
3186 * @extends YAHOO.util.DragDrop
3187 * @constructor
3188 * @param {String} id the id of the element that is a drop target
3189 * @param {String} sGroup the group of related DragDrop objects
3190 * @param {object} config an object containing configurable attributes
3191 * Valid properties for DDTarget in addition to those in
3192 * DragDrop:
3193 * none
3194 */
3195 YAHOO.util.DDTarget = function(id, sGroup, config) {
3196 if (id) {
3197 this.initTarget(id, sGroup, config);
3198 }
3199 };
3201 // YAHOO.util.DDTarget.prototype = new YAHOO.util.DragDrop();
3202 YAHOO.extend(YAHOO.util.DDTarget, YAHOO.util.DragDrop, {
3203 toString: function() {
3204 return ("DDTarget " + this.id);
3205 }
3206 });
3207 YAHOO.register("dragdrop", YAHOO.util.DragDropMgr, {version: "2.3.0", build: "442"});