(function() {
var Event=YAHOO.util.Event;
var Dom=YAHOO.util.Dom;
/**
* 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:
* <ul>
* <li>linked element: the element that is passed into the constructor.
* This is the element which defines the boundaries for interaction with
* other DragDrop objects.</li>
* <li>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.</li>
* <li>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}
* </li>
* </ul>
* 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:
* <pre>
* dd = new YAHOO.util.DragDrop("div1", "group1");
* </pre>
* 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...
* <pre>
* dd.onDragDrop = function(e, id) {
* alert("dd was dropped on " + id);
* }
* </pre>
* @namespace YAHOO.util
* @class DragDrop
* @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.
* @property id
* @type String
*/
id: null,
/**
* Configuration attributes passed into the constructor
* @property config
* @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
* @property dragElId
* @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.
* @property handleElId
* @type String
* @private
*/
handleElId: null,
/**
* An associative array of HTML tags that will be ignored if clicked.
* @property invalidHandleTypes
* @type {string: string}
*/
invalidHandleTypes: null,
/**
* An associative array of ids for elements that will be ignored if clicked
* @property invalidHandleIds
* @type {string: string}
*/
invalidHandleIds: null,
/**
* An indexted array of css class names for elements that will be ignored
* if clicked.
* @property invalidHandleClasses
* @type string[]
*/
invalidHandleClasses: null,
/**
* The linked element's absolute X position at the time the drag was
* started
* @property startPageX
* @type int
* @private
*/
startPageX: 0,
/**
* The linked element's absolute X position at the time the drag was
* started
* @property startPageY
* @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.
* @property groups
* @type {string: string}
*/
groups: null,
/**
* Individual drag/drop instances can be locked. This will prevent
* onmousedown start drag.
* @property locked
* @type boolean
* @private
*/
locked: false,
/**
* Lock this instance
* @method lock
*/
lock: function() { this.locked = true; },
/**
* Unlock this instace
* @method unlock
*/
unlock: function() { this.locked = false; },
/**
* By default, all insances can be a drop target. This can be disabled by
* setting isTarget to false.
* @method isTarget
* @type boolean
*/
isTarget: true,
/**
* The padding configured for this drag and drop object for calculating
* the drop zone intersection with this object.
* @method padding
* @type int[]
*/
padding: null,
/**
* Cached reference to the linked element
* @property _domRef
* @private
*/
_domRef: null,
/**
* Internal typeof flag
* @property __ygDragDrop
* @private
*/
__ygDragDrop: true,
/**
* Set to true when horizontal contraints are applied
* @property constrainX
* @type boolean
* @private
*/
constrainX: false,
/**
* Set to true when vertical contraints are applied
* @property constrainY
* @type boolean
* @private
*/
constrainY: false,
/**
* The left constraint
* @property minX
* @type int
* @private
*/
minX: 0,
/**
* The right constraint
* @property maxX
* @type int
* @private
*/
maxX: 0,
/**
* The up constraint
* @property minY
* @type int
* @type int
* @private
*/
minY: 0,
/**
* The down constraint
* @property maxY
* @type int
* @private
*/
maxY: 0,
/**
* Maintain offsets when we resetconstraints. Set to true when you want
* the position of the element relative to its parent to stay the same
* when the page changes
*
* @property maintainOffset
* @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.
* @property xTicks
* @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.
* @property yTicks
* @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
* @property primaryButtonOnly
* @type boolean
*/
primaryButtonOnly: true,
/**
* The availabe property is false until the linked dom element is accessible.
* @property available
* @type boolean
*/
available: false,
/**
* By default, drags can only be initiated if the mousedown occurs in the
* region the linked element is. This is done in part to work around a
* bug in some browsers that mis-report the mousedown if the previous
* mouseup happened outside of the window. This property is set to true
* if outer handles are defined.
*
* @property hasOuterHandles
* @type boolean
* @default false
*/
hasOuterHandles: false,
/**
* Code that executes immediately before the startDrag event
* @method b4StartDrag
* @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.
* @method startDrag
* @param {int} X click location
* @param {int} Y click location
*/
startDrag: function(x, y) { /* override this */ },
/**
* Code that executes immediately before the onDrag event
* @method b4Drag
* @private
*/
b4Drag: function(e) { },
/**
* Abstract method called during the onMouseMove event while dragging an
* object.
* @method onDrag
* @param {Event} e the mousemove event
*/
onDrag: function(e) { /* override this */ },
/**
* Abstract method called when this element fist begins hovering over
* another DragDrop obj
* @method onDragEnter
* @param {Event} e the mousemove event
* @param {String|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
* @method b4DragOver
* @private
*/
b4DragOver: function(e) { },
/**
* Abstract method called when this element is hovering over another
* DragDrop obj
* @method onDragOver
* @param {Event} e the mousemove event
* @param {String|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
* @method b4DragOut
* @private
*/
b4DragOut: function(e) { },
/**
* Abstract method called when we are no longer hovering over an element
* @method onDragOut
* @param {Event} e the mousemove event
* @param {String|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
* @method b4DragDrop
* @private
*/
b4DragDrop: function(e) { },
/**
* Abstract method called when this item is dropped on another DragDrop
* obj
* @method onDragDrop
* @param {Event} e the mouseup event
* @param {String|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 */ },
/**
* Abstract method called when this item is dropped on an area with no
* drop target
* @method onInvalidDrop
* @param {Event} e the mouseup event
*/
onInvalidDrop: function(e) { /* override this */ },
/**
* Code that executes immediately before the endDrag event
* @method b4EndDrag
* @private
*/
b4EndDrag: function(e) { },
/**
* Fired when we are done dragging the object
* @method endDrag
* @param {Event} e the mouseup event
*/
endDrag: function(e) { /* override this */ },
/**
* Code executed immediately before the onMouseDown event
* @method b4MouseDown
* @param {Event} e the mousedown event
* @private
*/
b4MouseDown: function(e) { },
/**
* Event handler that fires when a drag/drop obj gets a mousedown
* @method onMouseDown
* @param {Event} e the mousedown event
*/
onMouseDown: function(e) { /* override this */ },
/**
* Event handler that fires when a drag/drop obj gets a mouseup
* @method onMouseUp
* @param {Event} e the mouseup event
*/
onMouseUp: function(e) { /* override this */ },
/**
* Override the onAvailable method to do what is needed after the initial
* position was determined.
* @method onAvailable
*/
onAvailable: function () {
this.logger.log("onAvailable (base)");
},
/**
* Returns a reference to the linked element
* @method getEl
* @return {HTMLElement} the html element
*/
getEl: function() {
if (!this._domRef) {
this._domRef = 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
* @method getDragEl
* @return {HTMLElement} the html element
*/
getDragEl: function() {
return Dom.get(this.dragElId);
},
/**
* Sets up the DragDrop object. Must be called in the constructor of any
* YAHOO.util.DragDrop subclass
* @method init
* @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);
Event.on(this.id, "mousedown", this.handleMouseDown, this, true);
// Event.on(this.id, "selectstart", Event.preventDefault);
},
/**
* Initializes Targeting functionality only... the object does not
* get a mousedown handler.
* @method initTarget
* @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 = {};
// assume that we have an element reference instead of an id if the
// parameter is not a string
if (typeof id !== "string") {
YAHOO.log("id is not a string, assuming it is an HTMLElement");
id = Dom.generateId(id);
}
// 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;
Event.onAvailable(id, this.handleOnAvailable, this, true);
// create a logger instance
this.logger = (YAHOO.widget.LogWriter) ?
new YAHOO.widget.LogWriter(this.toString()) : YAHOO;
// 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.
* @method applyConfig
*/
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
* @method handleOnAvailable
* @private
*/
handleOnAvailable: function() {
this.logger.log("handleOnAvailable");
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.
* @method setPadding
* @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 linked element.
* @method setInitialPosition
* @param {int} diffX the X offset, default 0
* @param {int} diffY the Y offset, default 0
*/
setInitPosition: function(diffX, diffY) {
var el = this.getEl();
if (!this.DDM.verifyEl(el)) {
this.logger.log(this.id + " element is broken");
return;
}
var dx = diffX || 0;
var dy = diffY || 0;
var p = Dom.getXY( el );
this.initPageX = p[0] - dx;
this.initPageY = p[1] - dy;
this.lastPageX = p[0];
this.lastPageY = p[1];
this.logger.log(this.id + " inital position: " + this.initPageX +
", " + this.initPageY);
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.
* @method setStartPosition
* @param pos current position (from previous lookup)
* @private
*/
setStartPosition: function(pos) {
var p = pos || 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.
* @method addToGroup
* @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
* @method removeFromGroup
* @param {string} sGroup The group to drop
*/
removeFromGroup: function(sGroup) {
this.logger.log("Removing from group: " + 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
* @method setDragElId
* @param id {string} 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.
* @method setHandleElId
* @param id {string} the id of the element that will be used to
* initiate the drag.
*/
setHandleElId: function(id) {
if (typeof id !== "string") {
YAHOO.log("id is not a string, assuming it is an HTMLElement");
id = Dom.generateId(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
* @method setOuterHandleElId
* @param id the id of the element that will be used to initiate the drag
*/
setOuterHandleElId: function(id) {
if (typeof id !== "string") {
YAHOO.log("id is not a string, assuming it is an HTMLElement");
id = Dom.generateId(id);
}
this.logger.log("Adding outer handle event: " + id);
Event.on(id, "mousedown",
this.handleMouseDown, this, true);
this.setHandleElId(id);
this.hasOuterHandles = true;
},
/**
* Remove all drag and drop hooks for this element
* @method unreg
*/
unreg: function() {
this.logger.log("DragDrop obj cleanup " + this.id);
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.)
* @method isLocked
* @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
* @method handleMouseDown
* @param {Event} e
* @param {YAHOO.util.DragDrop} oDD the clicked dd object (this dd obj)
* @private
*/
handleMouseDown: function(e, oDD) {
var button = e.which || e.button;
this.logger.log("button: " + button);
if (this.primaryButtonOnly && button > 1) {
this.logger.log("Mousedown was not produced by the primary button");
return;
}
if (this.isLocked()) {
this.logger.log("Drag and drop is disabled, aborting");
return;
}
this.logger.log("mousedown " + this.id);
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(Event.getPageX(e), Event.getPageY(e));
if (!this.hasOuterHandles && !this.DDM.isOverTarget(pt, this) ) {
this.logger.log("Click was not over the element: " + this.id);
} else {
if (this.clickValidator(e)) {
this.logger.log("click was a valid handle");
// set the initial element position
this.setStartPosition();
this.logger.log("firing onMouseDown events");
this.b4MouseDown(e);
this.onMouseDown(e);
this.DDM.handleMouseDown(e, this);
this.DDM.stopEvent(e);
} else {
this.logger.log("clickValidator returned false, drag not initiated");
}
}
},
clickValidator: function(e) {
var target = Event.getTarget(e);
return ( this.isValidHandleChild(target) &&
(this.id == this.handleElId ||
this.DDM.handleWasClicked(target, this.id)) );
},
/**
* 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.
* @method addInvalidHandleType
* @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
* @method addInvalidHandleId
* @param {string} id the element id of the element you wish to ignore
*/
addInvalidHandleId: function(id) {
if (typeof id !== "string") {
YAHOO.log("id is not a string, assuming it is an HTMLElement");
id = Dom.generateId(id);
}
this.invalidHandleIds[id] = id;
},
/**
* Lets you specify a css class of elements that will not initiate a drag
* @method addInvalidHandleClass
* @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
* @method removeInvalidHandleType
* @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
* @method removeInvalidHandleId
* @param {string} id the id of the element to re-enable
*/
removeInvalidHandleId: function(id) {
if (typeof id !== "string") {
YAHOO.log("id is not a string, assuming it is an HTMLElement");
id = Dom.generateId(id);
}
delete this.invalidHandleIds[id];
},
/**
* Unsets an invalid css class
* @method removeInvalidHandleClass
* @param {string} cssClass the class of the element(s) you wish to
* re-enable
*/
removeInvalidHandleClass: function(cssClass) {
for (var i=0, len=this.invalidHandleClasses.length; i<len; ++i) {
if (this.invalidHandleClasses[i] == cssClass) {
delete this.invalidHandleClasses[i];
}
}
},
/**
* Checks the tag exclusion list to see if this click should be ignored
* @method isValidHandleChild
* @param {HTMLElement} node the HTMLElement to evaluate
* @return {boolean} true if this is a valid tag type, false if not
*/
isValidHandleChild: function(node) {
var valid = true;
// var n = (node.nodeName == "#text") ? node.parentNode : node;
var nodeName;
try {
nodeName = node.nodeName.toUpperCase();
} catch(e) {
nodeName = node.nodeName;
}
valid = valid && !this.invalidHandleTypes[nodeName];
valid = valid && !this.invalidHandleIds[node.id];
for (var i=0, len=this.invalidHandleClasses.length; valid && i<len; ++i) {
valid = !Dom.hasClass(node, this.invalidHandleClasses[i]);
}
this.logger.log("Valid handle? ... " + valid);
return valid;
},
/**
* Create the array of horizontal tick marks if an interval was specified
* in setXConstraint().
* @method setXTicks
* @private
*/
setXTicks: function(iStartX, iTickSize) {
this.xTicks = [];
this.xTickSize = iTickSize;
var tickMap = {};
for (var i = this.initPageX; 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) ;
this.logger.log("xTicks: " + this.xTicks.join());
},
/**
* Create the array of vertical tick marks if an interval was specified in
* setYConstraint().
* @method setYTicks
* @private
*/
setYTicks: function(iStartY, iTickSize) {
// this.logger.log("setYTicks: " + iStartY + ", " + iTickSize
// + ", " + this.initPageY + ", " + this.minY + ", " + this.maxY );
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) ;
this.logger.log("yTicks: " + this.yTicks.join());
},
/**
* 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.
* @method setXConstraint
* @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;
this.logger.log("initPageX:" + this.initPageX + " minX:" + this.minX +
" maxX:" + this.maxX);
},
/**
* Clears any constraints applied to this instance. Also clears ticks
* since they can't exist independent of a constraint at this time.
* @method clearConstraints
*/
clearConstraints: function() {
this.logger.log("Clearing constraints");
this.constrainX = false;
this.constrainY = false;
this.clearTicks();
},
/**
* Clears any tick interval defined for this instance
* @method clearTicks
*/
clearTicks: function() {
this.logger.log("Clearing ticks");
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.
* @method setYConstraint
* @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.logger.log("setYConstraint: " + 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;
this.logger.log("initPageY:" + this.initPageY + " minY:" + this.minY +
" maxY:" + this.maxY);
},
/**
* resetConstraints must be called if you manually reposition a dd element.
* @method resetConstraints
* @param {boolean} maintainOffset
*/
resetConstraints: function() {
this.logger.log("resetConstraints");
// Maintain offsets if necessary
if (this.initPageX || this.initPageX === 0) {
this.logger.log("init pagexy: " + this.initPageX + ", " +
this.initPageY);
this.logger.log("last pagexy: " + this.lastPageX + ", " +
this.lastPageY);
// 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.
* @method getTick
* @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<len; ++i) {
var next = i + 1;
if (tickArray[next] && tickArray[next] >= 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
* @method toString
* @return {string} string representation of the dd obj
*/
toString: function() {
return ("DragDrop " + this.id);
}
};
})();