/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 0.11.3
*/
/**
* Defines the interface and base operation of items that that can be
* dragged or can be drop targets. It was designed to be extended, overriding
* the event handlers for startDrag, onDrag, onDragOver, onDragOut.
* Up to three html elements can be associated with a DragDrop instance:
*
* - linked element: the element that is passed into the constructor.
* This is the element which defines the boundaries for interaction with
* other DragDrop objects.
* - handle element(s): The drag operation only occurs if the element that
* was clicked matches a handle element. By default this is the linked
* element, but there are times that you will want only a portion of the
* linked element to initiate the drag operation, and the setHandleElId()
* method provides a way to define this.
* - drag element: this represents an the element that would be moved along
* with the cursor during a drag operation. By default, this is the linked
* element itself as in {@link YAHOO.util.DD}. setDragElId() lets you define
* a separate element that would be moved, as in {@link YAHOO.util.DDProxy}
*
*
* This class should not be instantiated until the onload event to ensure that
* the associated elements are available.
* The following would define a DragDrop obj that would interact with any
* other * DragDrop obj in the "group1" group:
*
* dd = new YAHOO.util.DragDrop("div1", "group1");
*
* Since none of the event handlers have been implemented, nothing would
* actually happen if you were to run the code above. Normally you would
* override this class or one of the default implementations, but you can
* also override the methods you want on an instance of the class...
*
* dd.onDragDrop = function(e, id) {
* alert("dd was dropped on " + id);
* }
*
* @constructor
* @param {String} id of the element that is linked to this instance
* @param {String} sGroup the group of related DragDrop objects
* @param {object} config an object containing configurable attributes
* Valid properties for DragDrop:
* padding, isTarget, maintainOffset, primaryButtonOnly
*/
YAHOO.util.DragDrop = function(id, sGroup, config) {
if (id) {
this.init(id, sGroup, config);
}
};
YAHOO.util.DragDrop.prototype = {
/**
* The id of the element associated with this object. This is what we
* refer to as the "linked element" because the size and position of
* this element is used to determine when the drag and drop objects have
* interacted.
*
* @type String
*/
id: null,
/**
* Configuration attributes passed into the constructor
* @type object
*/
config: null,
/**
* The id of the element that will be dragged. By default this is same
* as the linked element , but could be changed to another element. Ex:
* YAHOO.util.DDProxy
*
* @type String
* @private
*/
dragElId: null,
/**
* the id of the element that initiates the drag operation. By default
* this is the linked element, but could be changed to be a child of this
* element. This lets us do things like only starting the drag when the
* header element within the linked html element is clicked.
*
* @type String
* @private
*/
handleElId: null,
/**
* An associative array of HTML tags that will be ignored if clicked.
* @type {string: string}
*/
invalidHandleTypes: null,
/**
* An associative array of ids for elements that will be ignored if clicked
* @type {string: string}
*/
invalidHandleIds: null,
/**
* An indexted array of css class names for elements that will be ignored
* if clicked.
* @type string[]
*/
invalidHandleClasses: null,
/**
* The linked element's absolute X position at the time the drag was
* started
*
* @type int
* @private
*/
startPageX: 0,
/**
* The linked element's absolute X position at the time the drag was
* started
*
* @type int
* @private
*/
startPageY: 0,
/**
* The group defines a logical collection of DragDrop objects that are
* related. Instances only get events when interacting with other
* DragDrop object in the same group. This lets us define multiple
* groups using a single DragDrop subclass if we want.
* @type {string: string}
*/
groups: null,
/**
* Individual drag/drop instances can be locked. This will prevent
* onmousedown start drag.
*
* @type boolean
* @private
*/
locked: false,
/**
* Lock this instance
*/
lock: function() { this.locked = true; },
/**
* Unlock this instace
*/
unlock: function() { this.locked = false; },
/**
* By default, all insances can be a drop target. This can be disabled by
* setting isTarget to false.
*
* @type boolean
*/
isTarget: true,
/**
* The padding configured for this drag and drop object for calculating
* the drop zone intersection with this object.
* @type int[]
*/
padding: null,
/**
* @private
*/
_domRef: null,
/**
* Internal typeof flag
* @private
*/
__ygDragDrop: true,
/**
* Set to true when horizontal contraints are applied
*
* @type boolean
* @private
*/
constrainX: false,
/**
* Set to true when vertical contraints are applied
*
* @type boolean
* @private
*/
constrainY: false,
/**
* The left constraint
*
* @type int
* @private
*/
minX: 0,
/**
* The right constraint
*
* @type int
* @private
*/
maxX: 0,
/**
* The up constraint
*
* @type int
* @private
*/
minY: 0,
/**
* The down constraint
*
* @type int
* @private
*/
maxY: 0,
/**
* Maintain offsets when we resetconstraints. Used to maintain the
* slider thumb value, and this needs to be fixed.
* @type boolean
*/
maintainOffset: false,
/**
* Array of pixel locations the element will snap to if we specified a
* horizontal graduation/interval. This array is generated automatically
* when you define a tick interval.
* @type int[]
*/
xTicks: null,
/**
* Array of pixel locations the element will snap to if we specified a
* vertical graduation/interval. This array is generated automatically
* when you define a tick interval.
* @type int[]
*/
yTicks: null,
/**
* By default the drag and drop instance will only respond to the primary
* button click (left button for a right-handed mouse). Set to true to
* allow drag and drop to start with any mouse click that is propogated
* by the browser
* @type boolean
*/
primaryButtonOnly: true,
/**
* The availabe property is false until the linked dom element is accessible.
* @type boolean
*/
available: false,
/**
* Code that executes immediately before the startDrag event
* @private
*/
b4StartDrag: function(x, y) { },
/**
* Abstract method called after a drag/drop object is clicked
* and the drag or mousedown time thresholds have beeen met.
*
* @param {int} X click location
* @param {int} Y click location
*/
startDrag: function(x, y) { /* override this */ },
/**
* Code that executes immediately before the onDrag event
* @private
*/
b4Drag: function(e) { },
/**
* Abstract method called during the onMouseMove event while dragging an
* object.
*
* @param {Event} e
*/
onDrag: function(e) { /* override this */ },
/**
* Code that executes immediately before the onDragEnter event
* @private
*/
// b4DragEnter: function(e) { },
/**
* Abstract method called when this element fist begins hovering over
* another DragDrop obj
*
* @param {Event} e
* @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
* id this is hovering over. In INTERSECT mode, an array of one or more
* dragdrop items being hovered over.
*/
onDragEnter: function(e, id) { /* override this */ },
/**
* Code that executes immediately before the onDragOver event
* @private
*/
b4DragOver: function(e) { },
/**
* Abstract method called when this element is hovering over another
* DragDrop obj
*
* @param {Event} e
* @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
* id this is hovering over. In INTERSECT mode, an array of dd items
* being hovered over.
*/
onDragOver: function(e, id) { /* override this */ },
/**
* Code that executes immediately before the onDragOut event
* @private
*/
b4DragOut: function(e) { },
/**
* Abstract method called when we are no longer hovering over an element
*
* @param {Event} e
* @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
* id this was hovering over. In INTERSECT mode, an array of dd items
* that the mouse is no longer over.
*/
onDragOut: function(e, id) { /* override this */ },
/**
* Code that executes immediately before the onDragDrop event
* @private
*/
b4DragDrop: function(e) { },
/**
* Abstract method called when this item is dropped on another DragDrop
* obj
*
* @param {Event} e
* @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
* id this was dropped on. In INTERSECT mode, an array of dd items this
* was dropped on.
*/
onDragDrop: function(e, id) { /* override this */ },
/**
* Code that executes immediately before the endDrag event
* @private
*/
b4EndDrag: function(e) { },
/**
* Fired when we are done dragging the object
*
* @param {Event} e
*/
endDrag: function(e) { /* override this */ },
/**
* Code executed immediately before the onMouseDown event
* @param {Event} e
* @private
*/
b4MouseDown: function(e) { },
/**
* Event handler that fires when a drag/drop obj gets a mousedown
* @param {Event} e
*/
onMouseDown: function(e) { /* override this */ },
/**
* Event handler that fires when a drag/drop obj gets a mouseup
* @param {Event} e
*/
onMouseUp: function(e) { /* override this */ },
/**
* Override the onAvailable method to do what is needed after the initial
* position was determined.
*/
onAvailable: function () {
},
/**
* Returns a reference to the linked element
*
* @return {HTMLElement} the html element
*/
getEl: function() {
if (!this._domRef) {
this._domRef = YAHOO.util.Dom.get(this.id);
}
return this._domRef;
},
/**
* Returns a reference to the actual element to drag. By default this is
* the same as the html element, but it can be assigned to another
* element. An example of this can be found in YAHOO.util.DDProxy
*
* @return {HTMLElement} the html element
*/
getDragEl: function() {
return YAHOO.util.Dom.get(this.dragElId);
},
/**
* Sets up the DragDrop object. Must be called in the constructor of any
* YAHOO.util.DragDrop subclass
*
* @param id the id of the linked element
* @param {String} sGroup the group of related items
* @param {object} config configuration attributes
*/
init: function(id, sGroup, config) {
this.initTarget(id, sGroup, config);
YAHOO.util.Event.addListener(this.id, "mousedown",
this.handleMouseDown, this, true);
},
/**
* Initializes Targeting functionality only... the object does not
* get a mousedown handler.
*
* @param id the id of the linked element
* @param {String} sGroup the group of related items
* @param {object} config configuration attributes
*/
initTarget: function(id, sGroup, config) {
// configuration attributes
this.config = config || {};
// create a local reference to the drag and drop manager
this.DDM = YAHOO.util.DDM;
// initialize the groups array
this.groups = {};
// set the id
this.id = id;
// add to an interaction group
this.addToGroup((sGroup) ? sGroup : "default");
// We don't want to register this as the handle with the manager
// so we just set the id rather than calling the setter.
this.handleElId = id;
YAHOO.util.Event.onAvailable(id, this.handleOnAvailable, this, true);
// the linked element is the element that gets dragged by default
this.setDragElId(id);
// by default, clicked anchors will not start drag operations.
// @TODO what else should be here? Probably form fields.
this.invalidHandleTypes = { A: "A" };
this.invalidHandleIds = {};
this.invalidHandleClasses = [];
this.applyConfig();
},
/**
* Applies the configuration parameters that were passed into the constructor.
* This is supposed to happen at each level through the inheritance chain. So
* a DDProxy implentation will execute apply config on DDProxy, DD, and
* DragDrop in order to get all of the parameters that are available in
* each object.
*/
applyConfig: function() {
// configurable properties:
// padding, isTarget, maintainOffset, primaryButtonOnly
this.padding = this.config.padding || [0, 0, 0, 0];
this.isTarget = (this.config.isTarget !== false);
this.maintainOffset = (this.config.maintainOffset);
this.primaryButtonOnly = (this.config.primaryButtonOnly !== false);
},
/**
* Executed when the linked element is available
* @private
*/
handleOnAvailable: function() {
this.available = true;
this.resetConstraints();
this.onAvailable();
},
/**
* Configures the padding for the target zone in px. Effectively expands
* (or reduces) the virtual object size for targeting calculations.
* Supports css-style shorthand; if only one parameter is passed, all sides
* will have that padding, and if only two are passed, the top and bottom
* will have the first param, the left and right the second.
* @param {int} iTop Top pad
* @param {int} iRight Right pad
* @param {int} iBot Bot pad
* @param {int} iLeft Left pad
*/
setPadding: function(iTop, iRight, iBot, iLeft) {
// this.padding = [iLeft, iRight, iTop, iBot];
if (!iRight && 0 !== iRight) {
this.padding = [iTop, iTop, iTop, iTop];
} else if (!iBot && 0 !== iBot) {
this.padding = [iTop, iRight, iTop, iRight];
} else {
this.padding = [iTop, iRight, iBot, iLeft];
}
},
/**
* Stores the initial placement of the dd element
*/
setInitPosition: function(diffX, diffY) {
var el = this.getEl();
if (!this.DDM.verifyEl(el)) {
return;
}
var dx = diffX || 0;
var dy = diffY || 0;
var p = YAHOO.util.Dom.getXY( el );
this.initPageX = p[0] - dx;
this.initPageY = p[1] - dy;
this.lastPageX = p[0];
this.lastPageY = p[1];
this.setStartPosition(p);
},
/**
* Sets the start position of the element. This is set when the obj
* is initialized, the reset when a drag is started.
* @param pos current position (from previous lookup)
* @private
*/
setStartPosition: function(pos) {
var p = pos || YAHOO.util.Dom.getXY( this.getEl() );
this.deltaSetXY = null;
this.startPageX = p[0];
this.startPageY = p[1];
},
/**
* Add this instance to a group of related drag/drop objects. All
* instances belong to at least one group, and can belong to as many
* groups as needed.
*
* @param sGroup {string} the name of the group
*/
addToGroup: function(sGroup) {
this.groups[sGroup] = true;
this.DDM.regDragDrop(this, sGroup);
},
/**
* Remove's this instance from the supplied interaction group
* @param {string} sGroup The group to drop
*/
removeFromGroup: function(sGroup) {
if (this.groups[sGroup]) {
delete this.groups[sGroup];
}
this.DDM.removeDDFromGroup(this, sGroup);
},
/**
* Allows you to specify that an element other than the linked element
* will be moved with the cursor during a drag
*
* @param id the id of the element that will be used to initiate the drag
*/
setDragElId: function(id) {
this.dragElId = id;
},
/**
* Allows you to specify a child of the linked element that should be
* used to initiate the drag operation. An example of this would be if
* you have a content div with text and links. Clicking anywhere in the
* content area would normally start the drag operation. Use this method
* to specify that an element inside of the content div is the element
* that starts the drag operation.
*
* @param id the id of the element that will be used to initiate the drag
*/
setHandleElId: function(id) {
this.handleElId = id;
this.DDM.regHandle(this.id, id);
},
/**
* Allows you to set an element outside of the linked element as a drag
* handle
*/
setOuterHandleElId: function(id) {
YAHOO.util.Event.addListener(id, "mousedown",
this.handleMouseDown, this, true);
this.setHandleElId(id);
},
/**
* Remove all drag and drop hooks for this element
*/
unreg: function() {
YAHOO.util.Event.removeListener(this.id, "mousedown",
this.handleMouseDown);
this._domRef = null;
this.DDM._remove(this);
},
/**
* Returns true if this instance is locked, or the drag drop mgr is locked
* (meaning that all drag/drop is disabled on the page.)
*
* @return {boolean} true if this obj or all drag/drop is locked, else
* false
*/
isLocked: function() {
return (this.DDM.isLocked() || this.locked);
},
/**
* Fired when this object is clicked
*
* @param {Event} e
* @param {YAHOO.util.DragDrop} oDD the clicked dd object (this dd obj)
* @private
*/
handleMouseDown: function(e, oDD) {
var EU = YAHOO.util.Event;
var button = e.which || e.button;
if (this.primaryButtonOnly && button > 1) {
return;
}
if (this.isLocked()) {
return;
}
this.DDM.refreshCache(this.groups);
// var self = this;
// setTimeout( function() { self.DDM.refreshCache(self.groups); }, 0);
// Only process the event if we really clicked within the linked
// element. The reason we make this check is that in the case that
// another element was moved between the clicked element and the
// cursor in the time between the mousedown and mouseup events. When
// this happens, the element gets the next mousedown event
// regardless of where on the screen it happened.
var pt = new YAHOO.util.Point(EU.getPageX(e), EU.getPageY(e));
if ( this.DDM.isOverTarget(pt, this) ) {
// check to see if the handle was clicked
var srcEl = EU.getTarget(e);
if (this.isValidHandleChild(srcEl) &&
(this.id == this.handleElId ||
this.DDM.handleWasClicked(srcEl, this.id)) ) {
// set the initial element position
this.setStartPosition();
this.b4MouseDown(e);
this.onMouseDown(e);
this.DDM.handleMouseDown(e, this);
this.DDM.stopEvent(e);
}
}
},
/**
* Allows you to specify a tag name that should not start a drag operation
* when clicked. This is designed to facilitate embedding links within a
* drag handle that do something other than start the drag.
*
* @param {string} tagName the type of element to exclude
*/
addInvalidHandleType: function(tagName) {
var type = tagName.toUpperCase();
this.invalidHandleTypes[type] = type;
},
/**
* Lets you to specify an element id for a child of a drag handle
* that should not initiate a drag
* @param {string} id the element id of the element you wish to ignore
*/
addInvalidHandleId: function(id) {
this.invalidHandleIds[id] = id;
},
/**
* Lets you specify a css class of elements that will not initiate a drag
* @param {string} cssClass the class of the elements you wish to ignore
*/
addInvalidHandleClass: function(cssClass) {
this.invalidHandleClasses.push(cssClass);
},
/**
* Unsets an excluded tag name set by addInvalidHandleType
*
* @param {string} tagName the type of element to unexclude
*/
removeInvalidHandleType: function(tagName) {
var type = tagName.toUpperCase();
// this.invalidHandleTypes[type] = null;
delete this.invalidHandleTypes[type];
},
/**
* Unsets an invalid handle id
* @param {string} the id of the element to re-enable
*/
removeInvalidHandleId: function(id) {
delete this.invalidHandleIds[id];
},
/**
* Unsets an invalid css class
* @param {string} the class of the element(s) you wish to re-enable
*/
removeInvalidHandleClass: function(cssClass) {
for (var i=0, len=this.invalidHandleClasses.length; i= this.minX; i = i - iTickSize) {
if (!tickMap[i]) {
this.xTicks[this.xTicks.length] = i;
tickMap[i] = true;
}
}
for (i = this.initPageX; i <= this.maxX; i = i + iTickSize) {
if (!tickMap[i]) {
this.xTicks[this.xTicks.length] = i;
tickMap[i] = true;
}
}
this.xTicks.sort(this.DDM.numericSort) ;
},
/**
* Create the array of vertical tick marks if an interval was specified in
* setYConstraint().
*
* @private
*/
setYTicks: function(iStartY, iTickSize) {
this.yTicks = [];
this.yTickSize = iTickSize;
var tickMap = {};
for (var i = this.initPageY; i >= this.minY; i = i - iTickSize) {
if (!tickMap[i]) {
this.yTicks[this.yTicks.length] = i;
tickMap[i] = true;
}
}
for (i = this.initPageY; i <= this.maxY; i = i + iTickSize) {
if (!tickMap[i]) {
this.yTicks[this.yTicks.length] = i;
tickMap[i] = true;
}
}
this.yTicks.sort(this.DDM.numericSort) ;
},
/**
* By default, the element can be dragged any place on the screen. Use
* this method to limit the horizontal travel of the element. Pass in
* 0,0 for the parameters if you want to lock the drag to the y axis.
*
* @param {int} iLeft the number of pixels the element can move to the left
* @param {int} iRight the number of pixels the element can move to the
* right
* @param {int} iTickSize optional parameter for specifying that the
* element
* should move iTickSize pixels at a time.
*/
setXConstraint: function(iLeft, iRight, iTickSize) {
this.leftConstraint = iLeft;
this.rightConstraint = iRight;
this.minX = this.initPageX - iLeft;
this.maxX = this.initPageX + iRight;
if (iTickSize) { this.setXTicks(this.initPageX, iTickSize); }
this.constrainX = true;
},
/**
* Clears any constraints applied to this instance. Also clears ticks
* since they can't exist independent of a constraint at this time.
*/
clearConstraints: function() {
this.constrainX = false;
this.constrainY = false;
this.clearTicks();
},
/**
* Clears any tick interval defined for this instance
*/
clearTicks: function() {
this.xTicks = null;
this.yTicks = null;
this.xTickSize = 0;
this.yTickSize = 0;
},
/**
* By default, the element can be dragged any place on the screen. Set
* this to limit the vertical travel of the element. Pass in 0,0 for the
* parameters if you want to lock the drag to the x axis.
*
* @param {int} iUp the number of pixels the element can move up
* @param {int} iDown the number of pixels the element can move down
* @param {int} iTickSize optional parameter for specifying that the
* element should move iTickSize pixels at a time.
*/
setYConstraint: function(iUp, iDown, iTickSize) {
this.topConstraint = iUp;
this.bottomConstraint = iDown;
this.minY = this.initPageY - iUp;
this.maxY = this.initPageY + iDown;
if (iTickSize) { this.setYTicks(this.initPageY, iTickSize); }
this.constrainY = true;
},
/**
* resetConstraints must be called if you manually reposition a dd element.
* @param {boolean} maintainOffset
*/
resetConstraints: function() {
// Maintain offsets if necessary
if (this.initPageX || this.initPageX === 0) {
// figure out how much this thing has moved
var dx = (this.maintainOffset) ? this.lastPageX - this.initPageX : 0;
var dy = (this.maintainOffset) ? this.lastPageY - this.initPageY : 0;
this.setInitPosition(dx, dy);
// This is the first time we have detected the element's position
} else {
this.setInitPosition();
}
if (this.constrainX) {
this.setXConstraint( this.leftConstraint,
this.rightConstraint,
this.xTickSize );
}
if (this.constrainY) {
this.setYConstraint( this.topConstraint,
this.bottomConstraint,
this.yTickSize );
}
},
/**
* Normally the drag element is moved pixel by pixel, but we can specify
* that it move a number of pixels at a time. This method resolves the
* location when we have it set up like this.
*
* @param {int} val where we want to place the object
* @param {int[]} tickArray sorted array of valid points
* @return {int} the closest tick
* @private
*/
getTick: function(val, tickArray) {
if (!tickArray) {
// If tick interval is not defined, it is effectively 1 pixel,
// so we return the value passed to us.
return val;
} else if (tickArray[0] >= val) {
// The value is lower than the first tick, so we return the first
// tick.
return tickArray[0];
} else {
for (var i=0, len=tickArray.length; i= val) {
var diff1 = val - tickArray[i];
var diff2 = tickArray[next] - val;
return (diff2 > diff1) ? tickArray[i] : tickArray[next];
}
}
// The value is larger than the last tick, so we return the last
// tick.
return tickArray[tickArray.length - 1];
}
},
/**
* toString method
* @return {string} string representation of the dd obj
*/
toString: function() {
return ("DragDrop " + this.id);
}
};
// Only load the library once. Rewriting the manager class would orphan
// existing drag and drop instances.
if (!YAHOO.util.DragDropMgr) {
/**
* Handles the element interaction for all DragDrop items in the
* window. Generally, you will not call this class directly, but it does
* have helper methods that could be useful in your DragDrop
* implementations. This class should not be instantiated; all methods
* are are static.
*
* @constructor
*/
YAHOO.util.DragDropMgr = new function() {
/**
* Two dimensional Array of registered DragDrop objects. The first
* dimension is the DragDrop item group, the second the DragDrop
* object.
*
* @type {string: string}
* @private
*/
this.ids = {};
/**
* Array of element ids defined as drag handles. Used to determine
* if the element that generated the mousedown event is actually the
* handle and not the html element itself.
*
* @type {string: string}
* @private
*/
this.handleIds = {};
/**
* the DragDrop object that is currently being dragged
*
* @type DragDrop
* @private
**/
this.dragCurrent = null;
/**
* the DragDrop object(s) that are being hovered over
*
* @type Array
* @private
*/
this.dragOvers = {};
/**
* @private
*/
/**
* the X distance between the cursor and the object being dragged
*
* @type int
* @private
*/
this.deltaX = 0;
/**
* the Y distance between the cursor and the object being dragged
*
* @type int
* @private
*/
this.deltaY = 0;
/**
* Flag to determine if we should prevent the default behavior of the
* events we define. By default this is true, but this can be set to
* false if you need the default behavior (not recommended)
*
* @type boolean
*/
this.preventDefault = true;
/**
* Flag to determine if we should stop the propagation of the events
* we generate. This is true by default but you may want to set it to
* false if the html element contains other features that require the
* mouse click.
*
* @type boolean
*/
this.stopPropagation = true;
/**
* @private
*/
this.initalized = false;
/**
* All drag and drop can be disabled.
*
* @private
*/
this.locked = false;
/**
* Called the first time an element is registered.
*
* @private
*/
this.init = function() {
this.initialized = true;
};
/**
* In point mode, drag and drop interaction is defined by the
* location of the cursor during the drag/drop
* @type int
*/
this.POINT = 0;
/**
* In intersect mode, drag and drop interactio nis defined by the
* overlap of two or more drag and drop objects.
* @type int
*/
this.INTERSECT = 1;
/**
* The current drag and drop mode. Default it point mode
* @type int
*/
this.mode = this.POINT;
/**
* Runs method on all drag and drop objects
* @private
*/
this._execOnAll = function(sMethod, args) {
for (var i in this.ids) {
for (var j in this.ids[i]) {
var oDD = this.ids[i][j];
if (! this.isTypeOfDD(oDD)) {
continue;
}
oDD[sMethod].apply(oDD, args);
}
}
};
/**
* Drag and drop initialization. Sets up the global event handlers
* @private
*/
this._onLoad = function() {
this.init();
var EU = YAHOO.util.Event;
EU.on(document, "mouseup", this.handleMouseUp, this, true);
EU.on(document, "mousemove", this.handleMouseMove, this, true);
EU.on(window, "unload", this._onUnload, this, true);
EU.on(window, "resize", this._onResize, this, true);
// EU.on(window, "mouseout", this._test);
};
/**
* Reset constraints on all drag and drop objs
* @private
*/
this._onResize = function(e) {
this._execOnAll("resetConstraints", []);
};
/**
* Lock all drag and drop functionality
*/
this.lock = function() { this.locked = true; };
/**
* Unlock all drag and drop functionality
*/
this.unlock = function() { this.locked = false; };
/**
* Is drag and drop locked?
*
* @return {boolean} True if drag and drop is locked, false otherwise.
*/
this.isLocked = function() { return this.locked; };
/**
* Location cache that is set for all drag drop objects when a drag is
* initiated, cleared when the drag is finished.
*
* @private
*/
this.locationCache = {};
/**
* Set useCache to false if you want to force object the lookup of each
* drag and drop linked element constantly during a drag.
* @type boolean
*/
this.useCache = true;
/**
* The number of pixels that the mouse needs to move after the
* mousedown before the drag is initiated. Default=3;
* @type int
*/
this.clickPixelThresh = 3;
/**
* The number of milliseconds after the mousedown event to initiate the
* drag if we don't get a mouseup event. Default=1000
* @type int
*/
this.clickTimeThresh = 1000;
/**
* Flag that indicates that either the drag pixel threshold or the
* mousdown time threshold has been met
* @type boolean
* @private
*/
this.dragThreshMet = false;
/**
* Timeout used for the click time threshold
* @type Object
* @private
*/
this.clickTimeout = null;
/**
* The X position of the mousedown event stored for later use when a
* drag threshold is met.
* @type int
* @private
*/
this.startX = 0;
/**
* The Y position of the mousedown event stored for later use when a
* drag threshold is met.
* @type int
* @private
*/
this.startY = 0;
/**
* Each DragDrop instance must be registered with the DragDropMgr.
* This is executed in DragDrop.init()
*
* @param {DragDrop} oDD the DragDrop object to register
* @param {String} sGroup the name of the group this element belongs to
*/
this.regDragDrop = function(oDD, sGroup) {
if (!this.initialized) { this.init(); }
if (!this.ids[sGroup]) {
this.ids[sGroup] = {};
}
this.ids[sGroup][oDD.id] = oDD;
};
/**
* Removes the supplied dd instance from the supplied group. Executed
* by DragDrop.removeFromGroup.
* @private
*/
this.removeDDFromGroup = function(oDD, sGroup) {
if (!this.ids[sGroup]) {
this.ids[sGroup] = {};
}
var obj = this.ids[sGroup];
if (obj && obj[oDD.id]) {
delete obj[oDD.id];
}
};
/**
* Unregisters a drag and drop item. This is executed in
* DragDrop.unreg, use that method instead of calling this directly.
* @private
*/
this._remove = function(oDD) {
for (var g in oDD.groups) {
if (g && this.ids[g][oDD.id]) {
delete this.ids[g][oDD.id];
}
}
delete this.handleIds[oDD.id];
};
/**
* Each DragDrop handle element must be registered. This is done
* automatically when executing DragDrop.setHandleElId()
*
* @param {String} sDDId the DragDrop id this element is a handle for
* @param {String} sHandleId the id of the element that is the drag
* handle
*/
this.regHandle = function(sDDId, sHandleId) {
if (!this.handleIds[sDDId]) {
this.handleIds[sDDId] = {};
}
this.handleIds[sDDId][sHandleId] = sHandleId;
};
/**
* Utility function to determine if a given element has been
* registered as a drag drop item.
*
* @param {String} id the element id to check
* @return {boolean} true if this element is a DragDrop item,
* false otherwise
*/
this.isDragDrop = function(id) {
return ( this.getDDById(id) ) ? true : false;
};
/**
* Returns the drag and drop instances that are in all groups the
* passed in instance belongs to.
*
* @param {DragDrop} p_oDD the obj to get related data for
* @param {boolean} bTargetsOnly if true, only return targetable objs
* @return {DragDrop[]} the related instances
*/
this.getRelated = function(p_oDD, bTargetsOnly) {
var oDDs = [];
for (var i in p_oDD.groups) {
for (j in this.ids[i]) {
var dd = this.ids[i][j];
if (! this.isTypeOfDD(dd)) {
continue;
}
if (!bTargetsOnly || dd.isTarget) {
oDDs[oDDs.length] = dd;
}
}
}
return oDDs;
};
/**
* Returns true if the specified dd target is a legal target for
* the specifice drag obj
*
* @param {DragDrop} the drag obj
* @param {DragDrop) the target
* @return {boolean} true if the target is a legal target for the
* dd obj
*/
this.isLegalTarget = function (oDD, oTargetDD) {
var targets = this.getRelated(oDD, true);
for (var i=0, len=targets.length;i this.clickPixelThresh ||
diffY > this.clickPixelThresh) {
this.startDrag(this.startX, this.startY);
}
}
if (this.dragThreshMet) {
this.dragCurrent.b4Drag(e);
this.dragCurrent.onDrag(e);
this.fireEvents(e, false);
}
this.stopEvent(e);
return true;
};
/**
* Iterates over all of the DragDrop elements to find ones we are
* hovering over or dropping on
*
* @param {Event} e the event
* @param {boolean} isDrop is this a drop op or a mouseover op?
* @private
*/
this.fireEvents = function(e, isDrop) {
var dc = this.dragCurrent;
// If the user did the mouse up outside of the window, we could
// get here even though we have ended the drag.
if (!dc || dc.isLocked()) {
return;
}
var x = YAHOO.util.Event.getPageX(e);
var y = YAHOO.util.Event.getPageY(e);
var pt = new YAHOO.util.Point(x,y);
// cache the previous dragOver array
var oldOvers = [];
var outEvts = [];
var overEvts = [];
var dropEvts = [];
var enterEvts = [];
// Check to see if the object(s) we were hovering over is no longer
// being hovered over so we can fire the onDragOut event
for (var i in this.dragOvers) {
var ddo = this.dragOvers[i];
if (! this.isTypeOfDD(ddo)) {
continue;
}
if (! this.isOverTarget(pt, ddo, this.mode)) {
outEvts.push( ddo );
}
oldOvers[i] = true;
delete this.dragOvers[i];
}
for (var sGroup in dc.groups) {
if ("string" != typeof sGroup) {
continue;
}
for (i in this.ids[sGroup]) {
var oDD = this.ids[sGroup][i];
if (! this.isTypeOfDD(oDD)) {
continue;
}
if (oDD.isTarget && !oDD.isLocked() && oDD != dc) {
if (this.isOverTarget(pt, oDD, this.mode)) {
// look for drop interactions
if (isDrop) {
dropEvts.push( oDD );
// look for drag enter and drag over interactions
} else {
// initial drag over: dragEnter fires
if (!oldOvers[oDD.id]) {
enterEvts.push( oDD );
// subsequent drag overs: dragOver fires
} else {
overEvts.push( oDD );
}
this.dragOvers[oDD.id] = oDD;
}
}
}
}
}
if (this.mode) {
if (outEvts.length) {
dc.b4DragOut(e, outEvts);
dc.onDragOut(e, outEvts);
}
if (enterEvts.length) {
dc.onDragEnter(e, enterEvts);
}
if (overEvts.length) {
dc.b4DragOver(e, overEvts);
dc.onDragOver(e, overEvts);
}
if (dropEvts.length) {
dc.b4DragDrop(e, dropEvts);
dc.onDragDrop(e, dropEvts);
}
} else {
// fire dragout events
var len = 0;
for (i=0, len=outEvts.length; i 1000) {
} else {
var DDM = YAHOO.util.DDM;
setTimeout( function() { DDM._addListeners(); }, 10);
if (document && document.body) {
this._timeoutCount += 1;
}
}
}
};
/**
* Recursively searches the immediate parent and all child nodes for
* the handle element in order to determine wheter or not it was
* clicked.
* @param node the html element to inspect
*/
this.handleWasClicked = function(node, id) {
if (this.isHandle(id, node.id)) {
return true;
} else {
// check to see if this is a text node child of the one we want
var p = node.parentNode;
while (p) {
if (this.isHandle(id, p.id)) {
return true;
} else {
p = p.parentNode;
}
}
}
return false;
};
} ();
// shorter alias, save a few bytes
YAHOO.util.DDM = YAHOO.util.DragDropMgr;
YAHOO.util.DDM._addListeners();
}
//YAHOO.util.DragDropMgr.enableWindow = function(win) {
//var EU = YAHOO.util.Event;
//EU.on(win.document, "mouseup", this.handleMouseUp, this, true);
//EU.on(win.document, "mousemove", this.handleMouseMove, this, true);
//};
/**
* A DragDrop implementation where the linked element follows the
* mouse cursor during a drag.
*
* @extends YAHOO.util.DragDrop
* @constructor
* @param {String} id the id of the linked element
* @param {String} sGroup the group of related DragDrop items
* @param {object} config an object containing configurable attributes
* Valid properties for DD:
* scroll
*/
YAHOO.util.DD = function(id, sGroup, config) {
if (id) {
this.init(id, sGroup, config);
}
};
// YAHOO.util.DD.prototype = new YAHOO.util.DragDrop();
YAHOO.extend(YAHOO.util.DD, YAHOO.util.DragDrop);
/**
* When set to true, the utility automatically tries to scroll the browser
* window wehn a drag and drop element is dragged near the viewport boundary.
* Defaults to true.
*
* @type boolean
*/
YAHOO.util.DD.prototype.scroll = true;
/**
* Sets the pointer offset to the distance between the linked element's top
* left corner and the location the element was clicked
*
* @param {int} iPageX the X coordinate of the click
* @param {int} iPageY the Y coordinate of the click
*/
YAHOO.util.DD.prototype.autoOffset = function(iPageX, iPageY) {
// var el = this.getEl();
// var aCoord = YAHOO.util.Dom.getXY(el);
// var x = iPageX - aCoord[0];
// var y = iPageY - aCoord[1];
var x = iPageX - this.startPageX;
var y = iPageY - this.startPageY;
this.setDelta(x, y);
};
/**
* Sets the pointer offset. You can call this directly to force the offset to
* be in a particular location (e.g., pass in 0,0 to set it to the center of the
* object, as done in YAHOO.widget.Slider)
*
* @param {int} iDeltaX the distance from the left
* @param {int} iDeltaY the distance from the top
*/
YAHOO.util.DD.prototype.setDelta = function(iDeltaX, iDeltaY) {
this.deltaX = iDeltaX;
this.deltaY = iDeltaY;
};
/**
* Sets the drag element to the location of the mousedown or click event,
* maintaining the cursor location relative to the location on the element
* that was clicked. Override this if you want to place the element in a
* location other than where the cursor is.
*
* @param {int} iPageX the X coordinate of the mousedown or drag event
* @param {int} iPageY the Y coordinate of the mousedown or drag event
*/
YAHOO.util.DD.prototype.setDragElPos = function(iPageX, iPageY) {
// the first time we do this, we are going to check to make sure
// the element has css positioning
var el = this.getDragEl();
// if (!this.cssVerified) {
// var pos = el.style.position;
// }
this.alignElWithMouse(el, iPageX, iPageY);
};
/**
* Sets the element to the location of the mousedown or click event,
* maintaining the cursor location relative to the location on the element
* that was clicked. Override this if you want to place the element in a
* location other than where the cursor is.
*
* @param {HTMLElement} el the element to move
* @param {int} iPageX the X coordinate of the mousedown or drag event
* @param {int} iPageY the Y coordinate of the mousedown or drag event
*/
YAHOO.util.DD.prototype.alignElWithMouse = function(el, iPageX, iPageY) {
var oCoord = this.getTargetCoord(iPageX, iPageY);
// this.deltaSetXY = null;
if (!this.deltaSetXY) {
var aCoord = [oCoord.x, oCoord.y];
YAHOO.util.Dom.setXY(el, aCoord);
var newLeft = parseInt( YAHOO.util.Dom.getStyle(el, "left"), 10 );
var newTop = parseInt( YAHOO.util.Dom.getStyle(el, "top" ), 10 );
this.deltaSetXY = [ newLeft - oCoord.x, newTop - oCoord.y ];
} else {
YAHOO.util.Dom.setStyle(el, "left", (oCoord.x + this.deltaSetXY[0]) + "px");
YAHOO.util.Dom.setStyle(el, "top", (oCoord.y + this.deltaSetXY[1]) + "px");
}
this.cachePosition(oCoord.x, oCoord.y);
this.autoScroll(oCoord.x, oCoord.y, el.offsetHeight, el.offsetWidth);
};
/**
* Saves the most recent position so that we can reset the constraints and
* tick marks on-demand. We need to know this so that we can calculate the
* number of pixels the element is offset from its original position.
*/
YAHOO.util.DD.prototype.cachePosition = function(iPageX, iPageY) {
if (iPageX) {
this.lastPageX = iPageX;
this.lastPageY = iPageY;
} else {
var aCoord = YAHOO.util.Dom.getXY(this.getEl());
this.lastPageX = aCoord[0];
this.lastPageY = aCoord[1];
}
};
/**
* Auto-scroll the window if the dragged object has been moved beyond the
* visible window boundary.
*
* @param {int} x the drag element's x position
* @param {int} y the drag element's y position
* @param {int} h the height of the drag element
* @param {int} w the width of the drag element
* @private
*/
YAHOO.util.DD.prototype.autoScroll = function(x, y, h, w) {
if (this.scroll) {
// The client height
var clientH = this.DDM.getClientHeight();
// The client width
var clientW = this.DDM.getClientWidth();
// The amt scrolled down
var st = this.DDM.getScrollTop();
// The amt scrolled right
var sl = this.DDM.getScrollLeft();
// Location of the bottom of the element
var bot = h + y;
// Location of the right of the element
var right = w + x;
// The distance from the cursor to the bottom of the visible area,
// adjusted so that we don't scroll if the cursor is beyond the
// element drag constraints
var toBot = (clientH + st - y - this.deltaY);
// The distance from the cursor to the right of the visible area
var toRight = (clientW + sl - x - this.deltaX);
// How close to the edge the cursor must be before we scroll
// var thresh = (document.all) ? 100 : 40;
var thresh = 40;
// How many pixels to scroll per autoscroll op. This helps to reduce
// clunky scrolling. IE is more sensitive about this ... it needs this
// value to be higher.
var scrAmt = (document.all) ? 80 : 30;
// Scroll down if we are near the bottom of the visible page and the
// obj extends below the crease
if ( bot > clientH && toBot < thresh ) {
window.scrollTo(sl, st + scrAmt);
}
// Scroll up if the window is scrolled down and the top of the object
// goes above the top border
if ( y < st && st > 0 && y - st < thresh ) {
window.scrollTo(sl, st - scrAmt);
}
// Scroll right if the obj is beyond the right border and the cursor is
// near the border.
if ( right > clientW && toRight < thresh ) {
window.scrollTo(sl + scrAmt, st);
}
// Scroll left if the window has been scrolled to the right and the obj
// extends past the left border
if ( x < sl && sl > 0 && x - sl < thresh ) {
window.scrollTo(sl - scrAmt, st);
}
}
};
/**
* Finds the location the element should be placed if we want to move
* it to where the mouse location less the click offset would place us.
*
* @param {int} iPageX the X coordinate of the click
* @param {int} iPageY the Y coordinate of the click
* @return an object that contains the coordinates (Object.x and Object.y)
* @private
*/
YAHOO.util.DD.prototype.getTargetCoord = function(iPageX, iPageY) {
var x = iPageX - this.deltaX;
var y = iPageY - this.deltaY;
if (this.constrainX) {
if (x < this.minX) { x = this.minX; }
if (x > this.maxX) { x = this.maxX; }
}
if (this.constrainY) {
if (y < this.minY) { y = this.minY; }
if (y > this.maxY) { y = this.maxY; }
}
x = this.getTick(x, this.xTicks);
y = this.getTick(y, this.yTicks);
return {x:x, y:y};
};
YAHOO.util.DD.prototype.applyConfig = function() {
YAHOO.util.DD.superclass.applyConfig.call(this);
this.scroll = (this.config.scroll !== false);
};
/**
* Event that fires prior to the onMouseDown event. Overrides
* YAHOO.util.DragDrop.
*/
YAHOO.util.DD.prototype.b4MouseDown = function(e) {
// this.resetConstraints();
this.autoOffset(YAHOO.util.Event.getPageX(e),
YAHOO.util.Event.getPageY(e));
};
/**
* Event that fires prior to the onDrag event. Overrides
* YAHOO.util.DragDrop.
*/
YAHOO.util.DD.prototype.b4Drag = function(e) {
this.setDragElPos(YAHOO.util.Event.getPageX(e),
YAHOO.util.Event.getPageY(e));
};
YAHOO.util.DD.prototype.toString = function() {
return ("DD " + this.id);
};
///////////////////////////////////////////////////////////////////////////////
// Debugging ygDragDrop events that can be overridden
///////////////////////////////////////////////////////////////////////////////
/*
YAHOO.util.DD.prototype.startDrag = function(x, y) {
};
YAHOO.util.DD.prototype.onDrag = function(e) {
};
YAHOO.util.DD.prototype.onDragEnter = function(e, id) {
};
YAHOO.util.DD.prototype.onDragOver = function(e, id) {
};
YAHOO.util.DD.prototype.onDragOut = function(e, id) {
};
YAHOO.util.DD.prototype.onDragDrop = function(e, id) {
};
YAHOO.util.DD.prototype.endDrag = function(e) {
};
*/
/**
* A DragDrop implementation that inserts an empty, bordered div into
* the document that follows the cursor during drag operations. At the time of
* the click, the frame div is resized to the dimensions of the linked html
* element, and moved to the exact location of the linked element.
*
* References to the "frame" element refer to the single proxy element that
* was created to be dragged in place of all DDProxy elements on the
* page.
*
* @extends YAHOO.util.DD
* @constructor
* @param {String} id the id of the linked html element
* @param {String} sGroup the group of related DragDrop objects
* @param {object} config an object containing configurable attributes
* Valid properties for DDProxy in addition to those in DragDrop:
* resizeFrame, centerFrame, dragElId
*/
YAHOO.util.DDProxy = function(id, sGroup, config) {
if (id) {
this.init(id, sGroup, config);
this.initFrame();
}
};
YAHOO.extend(YAHOO.util.DDProxy, YAHOO.util.DD);
/**
* The default drag frame div id
* @type String
*/
YAHOO.util.DDProxy.dragElId = "ygddfdiv";
/**
* By default we resize the drag frame to be the same size as the element
* we want to drag (this is to get the frame effect). We can turn it off
* if we want a different behavior.
*
* @type boolean
*/
YAHOO.util.DDProxy.prototype.resizeFrame = true;
/**
* By default the frame is positioned exactly where the drag element is, so
* we use the cursor offset provided by YAHOO.util.DD. Another option that works only if
* you do not have constraints on the obj is to have the drag frame centered
* around the cursor. Set centerFrame to true for this effect.
*
* @type boolean
*/
YAHOO.util.DDProxy.prototype.centerFrame = false;
/**
* Create the drag frame if needed
*/
YAHOO.util.DDProxy.prototype.createFrame = function() {
var self = this;
var body = document.body;
if (!body || !body.firstChild) {
setTimeout( function() { self.createFrame(); }, 50 );
return;
}
var div = this.getDragEl();
if (!div) {
div = document.createElement("div");
div.id = this.dragElId;
var s = div.style;
s.position = "absolute";
s.visibility = "hidden";
s.cursor = "move";
s.border = "2px solid #aaa";
s.zIndex = 999;
// appendChild can blow up IE if invoked prior to the window load event
// while rendering a table. It is possible there are other scenarios
// that would cause this to happen as well.
body.insertBefore(div, body.firstChild);
}
};
/**
* Initialization for the drag frame element. Must be called in the
* constructor of all subclasses
*/
YAHOO.util.DDProxy.prototype.initFrame = function() {
// YAHOO.util.DDProxy.createFrame();
// this.setDragElId(YAHOO.util.DDProxy.dragElId);
this.createFrame();
};
YAHOO.util.DDProxy.prototype.applyConfig = function() {
YAHOO.util.DDProxy.superclass.applyConfig.call(this);
this.resizeFrame = (this.config.resizeFrame !== false);
this.centerFrame = (this.config.centerFrame);
this.setDragElId(this.config.dragElId || YAHOO.util.DDProxy.dragElId);
};
/**
* Resizes the drag frame to the dimensions of the clicked object, positions
* it over the object, and finally displays it
*
* @param {int} iPageX X click position
* @param {int} iPageY Y click position
* @private
*/
YAHOO.util.DDProxy.prototype.showFrame = function(iPageX, iPageY) {
var el = this.getEl();
var dragEl = this.getDragEl();
var s = dragEl.style;
this._resizeProxy();
if (this.centerFrame) {
this.setDelta( Math.round(parseInt(s.width, 10)/2),
Math.round(parseInt(s.height, 10)/2) );
}
this.setDragElPos(iPageX, iPageY);
YAHOO.util.Dom.setStyle(dragEl, "visibility", "visible");
};
YAHOO.util.DDProxy.prototype._resizeProxy = function() {
if (this.resizeFrame) {
var DOM = YAHOO.util.Dom;
var el = this.getEl();
var dragEl = this.getDragEl();
var bt = parseInt( DOM.getStyle(dragEl, "borderTopWidth" ), 10);
var br = parseInt( DOM.getStyle(dragEl, "borderRightWidth" ), 10);
var bb = parseInt( DOM.getStyle(dragEl, "borderBottomWidth" ), 10);
var bl = parseInt( DOM.getStyle(dragEl, "borderLeftWidth" ), 10);
if (isNaN(bt)) { bt = 0; }
if (isNaN(br)) { br = 0; }
if (isNaN(bb)) { bb = 0; }
if (isNaN(bl)) { bl = 0; }
var newWidth = Math.max(0, el.offsetWidth - br - bl);
var newHeight = Math.max(0, el.offsetHeight - bt - bb);
DOM.setStyle( dragEl, "width", newWidth + "px" );
DOM.setStyle( dragEl, "height", newHeight + "px" );
}
};
// overrides YAHOO.util.DragDrop
YAHOO.util.DDProxy.prototype.b4MouseDown = function(e) {
var x = YAHOO.util.Event.getPageX(e);
var y = YAHOO.util.Event.getPageY(e);
this.autoOffset(x, y);
this.setDragElPos(x, y);
};
// overrides YAHOO.util.DragDrop
YAHOO.util.DDProxy.prototype.b4StartDrag = function(x, y) {
// show the drag frame
this.showFrame(x, y);
};
// overrides YAHOO.util.DragDrop
YAHOO.util.DDProxy.prototype.b4EndDrag = function(e) {
YAHOO.util.Dom.setStyle(this.getDragEl(), "visibility", "hidden");
};
// overrides YAHOO.util.DragDrop
// By default we try to move the element to the last location of the frame.
// This is so that the default behavior mirrors that of YAHOO.util.DD.
YAHOO.util.DDProxy.prototype.endDrag = function(e) {
var DOM = YAHOO.util.Dom;
var lel = this.getEl();
var del = this.getDragEl();
// Show the drag frame briefly so we can get its position
// del.style.visibility = "";
DOM.setStyle(del, "visibility", "");
// Hide the linked element before the move to get around a Safari
// rendering bug.
//lel.style.visibility = "hidden";
DOM.setStyle(lel, "visibility", "hidden");
YAHOO.util.DDM.moveToEl(lel, del);
//del.style.visibility = "hidden";
DOM.setStyle(del, "visibility", "hidden");
//lel.style.visibility = "";
DOM.setStyle(lel, "visibility", "");
};
YAHOO.util.DDProxy.prototype.toString = function() {
return ("DDProxy " + this.id);
};
/**
* A DragDrop implementation that does not move, but can be a drop
* target. You would get the same result by simply omitting implementation
* for the event callbacks, but this way we reduce the processing cost of the
* event listener and the callbacks.
*
* @extends YAHOO.util.DragDrop
* @constructor
* @param {String} id the id of the element that is a drop target
* @param {String} sGroup the group of related DragDrop objects
* @param {object} config an object containing configurable attributes
* Valid properties for DDTarget in addition to those in DragDrop:
* none
*/
YAHOO.util.DDTarget = function(id, sGroup, config) {
if (id) {
this.initTarget(id, sGroup, config);
}
};
// YAHOO.util.DDTarget.prototype = new YAHOO.util.DragDrop();
YAHOO.extend(YAHOO.util.DDTarget, YAHOO.util.DragDrop);
YAHOO.util.DDTarget.prototype.toString = function() {
return ("DDTarget " + this.id);
};